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Johannes Kirschbauer eec26b3ab2 fix: alias breakage of lib.pipe
2024-03-21 15:10:36 +00:00

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"content": "\nCompare two strings representing versions and return `-1` if\nversion *s1* is older than version *s2*, `0` if they are the same,\nand `1` if *s1* is newer than *s2*. The version comparison\nalgorithm is the same as the one used by [`nix-env\n-u`](../command-ref/nix-env.md#operation---upgrade).\n",
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},
"content": {
"content": "\nThis is like `seq e1 e2`, except that *e1* is evaluated *deeply*:\nif it’s a list or set, its elements or attributes are also\nevaluated recursively.\n",
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"content": "\nReturn the directory part of the string *s*, that is, everything\nbefore the final slash in the string. This is similar to the GNU\n`dirname` command.\n",
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"content": "\nReturn the quotient of the numbers *e1* and *e2*.\n",
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"content": "\nReturn `true` if a value equal to *x* occurs in the list *xs*, and\n`false` otherwise.\n",
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"content": "\nReturn element *n* from the list *xs*. Elements are counted starting\nfrom 0. A fatal error occurs if the index is out of bounds.\n",
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"content": "\nFetch a path from git. *args* can be a URL, in which case the HEAD\nof the repo at that URL is fetched. Otherwise, it can be an\nattribute with the following attributes (all except `url` optional):\n\n- `url`\n\n The URL of the repo.\n\n- `name` (default: *basename of the URL*)\n\n The name of the directory the repo should be exported to in the store.\n\n- `rev` (default: *the tip of `ref`*)\n\n The [Git revision] to fetch.\n This is typically a commit hash.\n\n [Git revision]: https://git-scm.com/docs/git-rev-parse#_specifying_revisions\n\n- `ref` (default: `HEAD`)\n\n The [Git reference] under which to look for the requested revision.\n This is often a branch or tag name.\n\n [Git reference]: https://git-scm.com/book/en/v2/Git-Internals-Git-References\n\n By default, the `ref` value is prefixed with `refs/heads/`.\n As of 2.3.0, Nix will not prefix `refs/heads/` if `ref` starts with `refs/`.\n\n- `submodules` (default: `false`)\n\n A Boolean parameter that specifies whether submodules should be checked out.\n\n- `shallow` (default: `false`)\n\n A Boolean parameter that specifies whether fetching a shallow clone is allowed.\n\n- `allRefs`\n\n Whether to fetch all references of the repository.\n With this argument being true, it's possible to load a `rev` from *any* `ref`\n (by default only `rev`s from the specified `ref` are supported).\n\nHere are some examples of how to use `fetchGit`.\n\n - To fetch a private repository over SSH:\n\n ```nix\n builtins.fetchGit {\n url = \"git@github.com:my-secret/repository.git\";\n ref = \"master\";\n rev = \"adab8b916a45068c044658c4158d81878f9ed1c3\";\n }\n ```\n\n - To fetch an arbitrary reference:\n\n ```nix\n builtins.fetchGit {\n url = \"https://github.com/NixOS/nix.git\";\n ref = \"refs/heads/0.5-release\";\n }\n ```\n\n - If the revision you're looking for is in the default branch of\n the git repository you don't strictly need to specify the branch\n name in the `ref` attribute.\n\n However, if the revision you're looking for is in a future\n branch for the non-default branch you will need to specify the\n the `ref` attribute as well.\n\n ```nix\n builtins.fetchGit {\n url = \"https://github.com/nixos/nix.git\";\n rev = \"841fcbd04755c7a2865c51c1e2d3b045976b7452\";\n ref = \"1.11-maintenance\";\n }\n ```\n\n > **Note**\n >\n > It is nice to always specify the branch which a revision\n > belongs to. Without the branch being specified, the fetcher\n > might fail if the default branch changes. Additionally, it can\n > be confusing to try a commit from a non-default branch and see\n > the fetch fail. If the branch is specified the fault is much\n > more obvious.\n\n - If the revision you're looking for is in the default branch of\n the git repository you may omit the `ref` attribute.\n\n ```nix\n builtins.fetchGit {\n url = \"https://github.com/nixos/nix.git\";\n rev = \"841fcbd04755c7a2865c51c1e2d3b045976b7452\";\n }\n ```\n\n - To fetch a specific tag:\n\n ```nix\n builtins.fetchGit {\n url = \"https://github.com/nixos/nix.git\";\n ref = \"refs/tags/1.9\";\n }\n ```\n\n - To fetch the latest version of a remote branch:\n\n ```nix\n builtins.fetchGit {\n url = \"ssh://git@github.com/nixos/nix.git\";\n ref = \"master\";\n }\n ```\n\n Nix will refetch the branch according to the [`tarball-ttl`](@docroot@/command-ref/conf-file.md#conf-tarball-ttl) setting.\n\n This behavior is disabled in [pure evaluation mode](@docroot@/command-ref/conf-file.md#conf-pure-eval).\n\n - To fetch the content of a checked-out work directory:\n\n ```nix\n builtins.fetchGit ./work-dir\n ```\n\nIf the URL points to a local directory, and no `ref` or `rev` is\ngiven, `fetchGit` will use the current content of the checked-out\nfiles, even if they are not committed or added to Git's index. It will\nonly consider files added to the Git repository, as listed by `git ls-files`.\n",
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"content": "\nDownload the specified URL, unpack it and return the path of the\nunpacked tree. The file must be a tape archive (`.tar`) compressed\nwith `gzip`, `bzip2` or `xz`. The top-level path component of the\nfiles in the tarball is removed, so it is best if the tarball\ncontains a single directory at top level. The typical use of the\nfunction is to obtain external Nix expression dependencies, such as\na particular version of Nixpkgs, e.g.\n\n```nix\nwith import (fetchTarball https://github.com/NixOS/nixpkgs/archive/nixos-14.12.tar.gz) {};\n\nstdenv.mkDerivation { … }\n```\n\nThe fetched tarball is cached for a certain amount of time (1\nhour by default) in `~/.cache/nix/tarballs/`. You can change the\ncache timeout either on the command line with `--tarball-ttl`\n*number-of-seconds* or in the Nix configuration file by adding\nthe line `tarball-ttl = ` *number-of-seconds*.\n\nNote that when obtaining the hash with `nix-prefetch-url` the\noption `--unpack` is required.\n\nThis function can also verify the contents against a hash. In that\ncase, the function takes a set instead of a URL. The set requires\nthe attribute `url` and the attribute `sha256`, e.g.\n\n```nix\nwith import (fetchTarball {\n url = \"https://github.com/NixOS/nixpkgs/archive/nixos-14.12.tar.gz\";\n sha256 = \"1jppksrfvbk5ypiqdz4cddxdl8z6zyzdb2srq8fcffr327ld5jj2\";\n}) {};\n\nstdenv.mkDerivation { … }\n```\n\nNot available in [restricted evaluation mode](@docroot@/command-ref/conf-file.md#conf-restrict-eval).\n",
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"content": "\nDownload the specified URL and return the path of the downloaded file.\n\nNot available in [restricted evaluation mode](@docroot@/command-ref/conf-file.md#conf-restrict-eval).\n",
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"content": "\nReturn a list consisting of the elements of *list* for which the\nfunction *f* returns `true`.\n",
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"content": "\n> **Warning**\n>\n> `filterSource` should not be used to filter store paths. Since\n> `filterSource` uses the name of the input directory while naming\n> the output directory, doing so will produce a directory name in\n> the form of `<hash2>-<hash>-<name>`, where `<hash>-<name>` is\n> the name of the input directory. Since `<hash>` depends on the\n> unfiltered directory, the name of the output directory will\n> indirectly depend on files that are filtered out by the\n> function. This will trigger a rebuild even when a filtered out\n> file is changed. Use `builtins.path` instead, which allows\n> specifying the name of the output directory.\n\nThis function allows you to copy sources into the Nix store while\nfiltering certain files. For instance, suppose that you want to use\nthe directory `source-dir` as an input to a Nix expression, e.g.\n\n```nix\nstdenv.mkDerivation {\n ...\n src = ./source-dir;\n}\n```\n\nHowever, if `source-dir` is a Subversion working copy, then all\nthose annoying `.svn` subdirectories will also be copied to the\nstore. Worse, the contents of those directories may change a lot,\ncausing lots of spurious rebuilds. With `filterSource` you can\nfilter out the `.svn` directories:\n\n```nix\nsrc = builtins.filterSource\n (path: type: type != \"directory\" || baseNameOf path != \".svn\")\n ./source-dir;\n```\n\nThus, the first argument *e1* must be a predicate function that is\ncalled for each regular file, directory or symlink in the source\ntree *e2*. If the function returns `true`, the file is copied to the\nNix store, otherwise it is omitted. The function is called with two\narguments. The first is the full path of the file. The second is a\nstring that identifies the type of the file, which is either\n`\"regular\"`, `\"directory\"`, `\"symlink\"` or `\"unknown\"` (for other\nkinds of files such as device nodes or fifos — but note that those\ncannot be copied to the Nix store, so if the predicate returns\n`true` for them, the copy will fail). If you exclude a directory,\nthe entire corresponding subtree of *e2* will be excluded.\n",
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"content": "\nLook up the given path with the given search path.\n\nA search path is represented list of [attribute sets](./values.md#attribute-set) with two attributes, `prefix`, and `path`.\n`prefix` is a relative path.\n`path` denotes a file system location; the exact syntax depends on the command line interface.\n\nExamples of search path attribute sets:\n\n- ```\n {\n prefix = \"nixos-config\";\n path = \"/etc/nixos/configuration.nix\";\n }\n ```\n\n- ```\n {\n prefix = \"\";\n path = \"/nix/var/nix/profiles/per-user/root/channels\";\n }\n ```\n\nThe lookup algorithm checks each entry until a match is found, returning a [path value](@docroot@/language/values.html#type-path) of the match.\n\nThis is the process for each entry:\nIf the lookup path matches `prefix`, then the remainder of the lookup path (the \"suffix\") is searched for within the directory denoted by `patch`.\nNote that the `path` may need to be downloaded at this point to look inside.\nIf the suffix is found inside that directory, then the entry is a match;\nthe combined absolute path of the directory (now downloaded if need be) and the suffix is returned.\n\n[Lookup path](@docroot@/language/constructs/lookup-path.md) expressions can be [desugared](https://en.wikipedia.org/wiki/Syntactic_sugar) using this and [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath):\n\n```nix\n<nixpkgs>\n```\n\nis equivalent to:\n\n```nix\nbuiltins.findFile builtins.nixPath \"nixpkgs\"\n```\n",
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"content": "\nConverts an IEEE-754 double-precision floating-point number (*double*) to\nthe next lower integer.\n\nIf the datatype is neither an integer nor a \"float\", an evaluation error will be\nthrown.\n",
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"content": "\nReduce a list by applying a binary operator, from left to right,\ne.g. `foldl' op nul [x0 x1 x2 ...] = op (op (op nul x0) x1) x2)\n...`. For example, `foldl' (x: y: x + y) 0 [1 2 3]` evaluates to 6.\nThe return value of each application of `op` is evaluated immediately,\neven for intermediate values.\n",
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"content": "\nConvert a JSON string to a Nix value. For example,\n\n```nix\nbuiltins.fromJSON ''{\"x\": [1, 2, 3], \"y\": null}''\n```\n\nreturns the value `{ x = [ 1 2 3 ]; y = null; }`.\n",
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"content": "\nConvert a TOML string to a Nix value. For example,\n\n```nix\nbuiltins.fromTOML ''\n x=1\n s=\"a\"\n [table]\n y=2\n''\n```\n\nreturns the value `{ s = \"a\"; table = { y = 2; }; x = 1; }`.\n",
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"content": "\nReturn a set containing the names of the formal arguments expected\nby the function *f*. The value of each attribute is a Boolean\ndenoting whether the corresponding argument has a default value. For\ninstance, `functionArgs ({ x, y ? 123}: ...) = { x = false; y =\ntrue; }`.\n\n\"Formal argument\" here refers to the attributes pattern-matched by\nthe function. Plain lambdas are not included, e.g. `functionArgs (x:\n...) = { }`.\n",
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"content": "\nGenerate list of size *length*, with each element *i* equal to the\nvalue returned by *generator* `i`. For example,\n\n```nix\nbuiltins.genList (x: x * x) 5\n```\n\nreturns the list `[ 0 1 4 9 16 ]`.\n",
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"content": "\nTakes an *attrset* with the following attributes:\n\n- `startSet` [ Item ]\n - A list of start items. Each item must be an attrset containing a `key`. The `key` must be comparable.\n- `operator` Item -> [ Item ]\n - A function\n\nreturns a *list of attrsets*\n\nGenericClosure starts with the `startSet` and recursively\napplying the `operator` function to each `item`. The *attrsets* in the\n`startSet` and the *attrsets* produced by `operator` must contain a value\nnamed `key` which is comparable. The result is produced by calling `operator`\nfor each `item` with a value for `key` that has not been called yet including\nnewly produced `item`s. The function terminates when no new `item`s are\nproduced. The resulting *list of attrsets* contains only *attrsets* with a\nunique key. For example,\n\n```\nbuiltins.genericClosure {\n startSet = [ {key = 5;} ];\n operator = item: [{\n key = if (item.key / 2 ) * 2 == item.key\n then item.key / 2\n else 3 * item.key + 1;\n }];\n}\n```\nevaluates to\n```\n[ { key = 5; } { key = 16; } { key = 8; } { key = 4; } { key = 2; } { key = 1; } ]\n```\n",
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"content": "\n`getAttr` returns the attribute named *s* from *set*. Evaluation\naborts if the attribute doesn’t exist. This is a dynamic version of\nthe `.` operator, since *s* is an expression rather than an\nidentifier.\n",
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"content": "\nReturns a list if the [extended POSIX regular\nexpression](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04)\n*regex* matches *str* precisely, otherwise returns `null`. Each item\nin the list is a regex group.\n\n```nix\nbuiltins.match \"ab\" \"abc\"\n```\n\nEvaluates to `null`.\n\n```nix\nbuiltins.match \"abc\" \"abc\"\n```\n\nEvaluates to `[ ]`.\n\n```nix\nbuiltins.match \"a(b)(c)\" \"abc\"\n```\n\nEvaluates to `[ \"b\" \"c\" ]`.\n\n```nix\nbuiltins.match \"[[:space:]]+([[:upper:]]+)[[:space:]]+\" \" FOO \"\n```\n\nEvaluates to `[ \"FOO\" ]`.\n",
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"content": "\nReturn the product of the numbers *e1* and *e2*.\n",
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"content": "\nReturn `true` if the path *path* exists at evaluation time, and\n`false` otherwise.\n",
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"content": "\nReturn a placeholder string for the specified *output* that will be\nsubstituted by the corresponding output path at build time. Typical\noutputs would be `\"out\"`, `\"bin\"` or `\"dev\"`.\n",
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"content": "\nReturn the contents of the directory *path* as a set mapping\ndirectory entries to the corresponding file type. For instance, if\ndirectory `A` contains a regular file `B` and another directory\n`C`, then `builtins.readDir ./A` will return the set\n\n```nix\n{ B = \"regular\"; C = \"directory\"; }\n```\n\nThe possible values for the file type are `\"regular\"`,\n`\"directory\"`, `\"symlink\"` and `\"unknown\"`.\n",
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"content": "\nReturn the contents of the file *path* as a string.\n",
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"title": "builtins.readFileType",
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"content": "\nRemove the attributes listed in *list* from *set*. The attributes\ndon’t have to exist in *set*. For instance,\n\n```nix\nremoveAttrs { x = 1; y = 2; z = 3; } [ \"a\" \"x\" \"z\" ]\n```\n\nevaluates to `{ y = 2; }`.\n",
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"content": "\nEvaluate *e1*, then evaluate and return *e2*. This ensures that a\ncomputation is strict in the value of *e1*.\n",
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"signature": null,
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"content": "\nReturns a list composed of non matched strings interleaved with the\nlists of the [extended POSIX regular\nexpression](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04)\n*regex* matches of *str*. Each item in the lists of matched\nsequences is a regex group.\n\n```nix\nbuiltins.split \"(a)b\" \"abc\"\n```\n\nEvaluates to `[ \"\" [ \"a\" ] \"c\" ]`.\n\n```nix\nbuiltins.split \"([ac])\" \"abc\"\n```\n\nEvaluates to `[ \"\" [ \"a\" ] \"b\" [ \"c\" ] \"\" ]`.\n\n```nix\nbuiltins.split \"(a)|(c)\" \"abc\"\n```\n\nEvaluates to `[ \"\" [ \"a\" null ] \"b\" [ null \"c\" ] \"\" ]`.\n\n```nix\nbuiltins.split \"([[:upper:]]+)\" \" FOO \"\n```\n\nEvaluates to `[ \" \" [ \"FOO\" ] \" \" ]`.\n",
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"content": "\nReturn the length of the string *e*. If *e* is not a string,\nevaluation is aborted.\n",
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"content": "\nReturn the difference between the numbers *e1* and *e2*.\n",
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"content": "\nReturn the substring of *s* from character position *start*\n(zero-based) up to but not including *start + len*. If *start* is\ngreater than the length of the string, an empty string is returned,\nand if *start + len* lies beyond the end of the string, only the\nsubstring up to the end of the string is returned. *start* must be\nnon-negative. For example,\n\n```nix\nbuiltins.substring 0 3 \"nixos\"\n```\n\nevaluates to `\"nix\"`.\n",
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"content": "\nReturn the list without its first item; abort evaluation if\nthe argument isn’t a list or is an empty list.\n\n> **Warning**\n>\n> This function should generally be avoided since it's inefficient:\n> unlike Haskell's `tail`, it takes O(n) time, so recursing over a\n> list by repeatedly calling `tail` takes O(n^2) time.\n",
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"content": "\nThrow an error message *s*. This usually aborts Nix expression\nevaluation, but in `nix-env -qa` and other commands that try to\nevaluate a set of derivations to get information about those\nderivations, a derivation that throws an error is silently skipped\n(which is not the case for `abort`).\n",
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"content": "\nStore the string *s* in a file in the Nix store and return its\npath. The file has suffix *name*. This file can be used as an\ninput to derivations. One application is to write builders\n“inline”. For instance, the following Nix expression combines the\nNix expression for GNU Hello and its build script into one file:\n\n```nix\n{ stdenv, fetchurl, perl }:\n\nstdenv.mkDerivation {\n name = \"hello-2.1.1\";\n\n builder = builtins.toFile \"builder.sh\" \"\n source $stdenv/setup\n\n PATH=$perl/bin:$PATH\n\n tar xvfz $src\n cd hello-*\n ./configure --prefix=$out\n make\n make install\n \";\n\n src = fetchurl {\n url = \"http://ftp.nluug.nl/pub/gnu/hello/hello-2.1.1.tar.gz\";\n sha256 = \"1md7jsfd8pa45z73bz1kszpp01yw6x5ljkjk2hx7wl800any6465\";\n };\n inherit perl;\n}\n```\n\nIt is even possible for one file to refer to another, e.g.,\n\n```nix\nbuilder = let\n configFile = builtins.toFile \"foo.conf\" \"\n # This is some dummy configuration file.\n ...\n \";\nin builtins.toFile \"builder.sh\" \"\n source $stdenv/setup\n ...\n cp ${configFile} $out/etc/foo.conf\n\";\n```\n\nNote that `${configFile}` is a\n[string interpolation](@docroot@/language/values.md#type-string), so the result of the\nexpression `configFile`\n(i.e., a path like `/nix/store/m7p7jfny445k...-foo.conf`) will be\nspliced into the resulting string.\n\nIt is however *not* allowed to have files mutually referring to each\nother, like so:\n\n```nix\nlet\n foo = builtins.toFile \"foo\" \"...${bar}...\";\n bar = builtins.toFile \"bar\" \"...${foo}...\";\nin foo\n```\n\nThis is not allowed because it would cause a cyclic dependency in\nthe computation of the cryptographic hashes for `foo` and `bar`.\n\nIt is also not possible to reference the result of a derivation. If\nyou are using Nixpkgs, the `writeTextFile` function is able to do\nthat.\n",
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"content": "\nReturn a string containing a JSON representation of *e*. Strings,\nintegers, floats, booleans, nulls and lists are mapped to their JSON\nequivalents. Sets (except derivations) are represented as objects.\nDerivations are translated to a JSON string containing the\nderivation’s output path. Paths are copied to the store and\nrepresented as a JSON string of the resulting store path.\n",
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"content": "\n**DEPRECATED.** Use `/. + \"/path\"` to convert a string into an absolute\npath. For relative paths, use `./. + \"/path\"`.\n",
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"content": "\nAppend a suffix to the name of a package (before the version\npart).\n\n# Arguments\n\n- [suffix] \n\n",
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"meta": {
"title": "lib.assertMsg",
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"aliases": [["lib", "asserts", "assertMsg"]],
"signature": "assertMsg :: Bool -> String -> Bool\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nThrow if pred is false, else return pred.\nIntended to be used to augment asserts with helpful error messages.\n\n# Example\n\n```nix\nassertMsg false \"nope\"\nstderr> error: nope\nassert assertMsg (\"foo\" == \"bar\") \"foo is not bar, silly\"; \"\"\nstderr> error: foo is not bar, silly\n```\n\n# Type\n\n```\nassertMsg :: Bool -> String -> Bool\n```\n\n# Arguments\n\n- [pred] Predicate that needs to succeed, otherwise `msg` is thrown\n- [msg] Message to throw in case `pred` fails\n\n",
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"signature": "assertOneOf :: String -> ComparableVal -> List ComparableVal -> Bool\n",
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"content": "\nSpecialized `assertMsg` for checking if `val` is one of the elements\nof the list `xs`. Useful for checking enums.\n\n# Example\n\n```nix\nlet sslLibrary = \"libressl\";\nin assertOneOf \"sslLibrary\" sslLibrary [ \"openssl\" \"bearssl\" ]\nstderr> error: sslLibrary must be one of [\nstderr> \"openssl\"\nstderr> \"bearssl\"\nstderr> ], but is: \"libressl\"\n```\n\n# Type\n\n```\nassertOneOf :: String -> ComparableVal -> List ComparableVal -> Bool\n```\n\n# Arguments\n\n- [name] The name of the variable the user entered `val` into, for inclusion in the error message\n- [val] The value of what the user provided, to be compared against the values in `xs`\n- [xs] The list of valid values\n\n",
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"title": "lib.attrByPath",
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"aliases": [["lib", "attrsets", "attrByPath"]],
"signature": "attrByPath :: [String] -> Any -> AttrSet -> Any\n",
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"path": ["lib", "attrsets", "attrByPath"],
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"content": {
"content": "\nReturn an attribute from nested attribute sets.\n\n# Example\n\n```nix\nx = { a = { b = 3; }; }\n# [\"a\" \"b\"] is equivalent to x.a.b\n# 6 is a default value to return if the path does not exist in attrset\nattrByPath [\"a\" \"b\"] 6 x\n=> 3\nattrByPath [\"z\" \"z\"] 6 x\n=> 6\n```\n\n# Type\n\n```\nattrByPath :: [String] -> Any -> AttrSet -> Any\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to return from `set`\n- [default] Default value if `attrPath` does not resolve to an existing value\n- [set] The nested attribute set to select values from\n\n",
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"meta": {
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"content": "\nReturn the names of the attributes in the set *set* in an\nalphabetically sorted list. For instance, `builtins.attrNames { y\n= 1; x = \"foo\"; }` evaluates to `[ \"x\" \"y\" ]`.\n",
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"title": "lib.attrVals",
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"signature": "attrVals :: [String] -> AttrSet -> [Any]\n",
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"content": "\nReturn the specified attributes from a set.\n\n# Example\n\n```nix\nattrVals [\"a\" \"b\" \"c\"] as\n=> [as.a as.b as.c]\n```\n\n# Type\n\n```\nattrVals :: [String] -> AttrSet -> [Any]\n```\n\n# Arguments\n\n- [nameList] The list of attributes to fetch from `set`. Each attribute name must exist on the attrbitue set\n- [set] The set to get attribute values from\n\n",
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"signature": "attrValues :: AttrSet -> [Any]\n",
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"content": {
"content": "\nReturn the values of all attributes in the given set, sorted by\nattribute name.\n\n# Example\n\n```nix\nattrValues {c = 3; a = 1; b = 2;}\n=> [1 2 3]\n```\n\n# Type\n\n```\nattrValues :: AttrSet -> [Any]\n```\n",
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"aliases": [["lib", "attrsets", "attrsToList"]],
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"content": "\nDeconstruct an attrset to a list of name-value pairs as expected by [`builtins.listToAttrs`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-listToAttrs).\nEach element of the resulting list is an attribute set with these attributes:\n- `name` (string): The name of the attribute\n- `value` (any): The value of the attribute\nThe following is always true:\n```nix\nbuiltins.listToAttrs (attrsToList attrs) == attrs\n```\n:::{.warning}\nThe opposite is not always true. In general expect that\n```nix\nattrsToList (builtins.listToAttrs list) != list\n```\nThis is because the `listToAttrs` removes duplicate names and doesn't preserve the order of the list.\n:::\n\n# Example\n\n```nix\nattrsToList { foo = 1; bar = \"asdf\"; }\n=> [ { name = \"bar\"; value = \"asdf\"; } { name = \"foo\"; value = 1; } ]\n```\n\n# Type\n\n```\nattrsToList :: AttrSet -> [ { name :: String; value :: Any; } ]\n```\n",
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"content": "\nbitwise “and”\n",
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"signature": null,
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"content": {
"content": "\nbitwise “not”\n",
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"content": {
"content": "\nbitwise “or”\n",
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"path": ["lib", "trivial", "bitXor"],
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"content": {
"content": "\nbitwise “xor”\n",
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"content": "\nConvert a boolean to a string.\nThis function uses the strings \"true\" and \"false\" to represent\nboolean values. Calling `toString` on a bool instead returns \"1\"\nand \"\" (sic!).\n\n# Type\n\n```\nboolToString :: bool -> string\n```\n\n# Arguments\n\n- [b] \n\n",
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"aliases": [["lib", "customisation", "callPackageWith"]],
"signature": "callPackageWith :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n",
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"content": "\nCall the package function in the file `fn` with the required\narguments automatically. The function is called with the\narguments `args`, but any missing arguments are obtained from\n`autoArgs`. This function is intended to be partially\nparameterised, e.g.,\n```nix\ncallPackage = callPackageWith pkgs;\npkgs = {\nlibfoo = callPackage ./foo.nix { };\nlibbar = callPackage ./bar.nix { };\n};\n```\nIf the `libbar` function expects an argument named `libfoo`, it is\nautomatically passed as an argument. Overrides or missing\narguments can be supplied in `args`, e.g.\n```nix\nlibbar = callPackage ./bar.nix {\nlibfoo = null;\nenableX11 = true;\n};\n```\n<!-- TODO: Apply \"Example:\" tag to the examples above -->\n\n# Type\n\n```\ncallPackageWith :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n```\n\n# Arguments\n\n- [autoArgs] \n- [fn] \n- [args] \n\n",
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"content": "\nLike callPackage, but for a function that returns an attribute\nset of derivations. The override function is added to the\nindividual attributes.\n\n# Type\n\n```\ncallPackagesWith :: AttrSet -> ((AttrSet -> AttrSet) | Path) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [autoArgs] \n- [fn] \n- [args] \n\n",
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"title": "lib.cartesianProductOfSets",
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"signature": "cartesianProductOfSets :: AttrSet -> [AttrSet]\n",
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"content": "\nReturn the cartesian product of attribute set value combinations.\n\n# Example\n\n```nix\ncartesianProductOfSets { a = [ 1 2 ]; b = [ 10 20 ]; }\n=> [\n { a = 1; b = 10; }\n { a = 1; b = 20; }\n { a = 2; b = 10; }\n { a = 2; b = 20; }\n ]\n```\n\n# Type\n\n```\ncartesianProductOfSets :: AttrSet -> [AttrSet]\n```\n\n# Arguments\n\n- [attrsOfLists] Attribute set with attributes that are lists of values\n\n",
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"content": "\nCollect each attribute named `attr` from a list of attribute\nsets. Sets that don't contain the named attribute are ignored.\n\n# Example\n\n```nix\ncatAttrs \"a\" [{a = 1;} {b = 0;} {a = 2;}]\n=> [1 2]\n```\n\n# Type\n\n```\ncatAttrs :: String -> [AttrSet] -> [Any]\n```\n",
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"content": "\nCheck if the elements in a list are valid values from a enum, returning the identity function, or throwing an error message otherwise.\n\n# Example\n\n```nix\nlet colorVariants = [\"bright\" \"dark\" \"black\"]\nin checkListOfEnum \"color variants\" [ \"standard\" \"light\" \"dark\" ] colorVariants;\n=>\nerror: color variants: bright, black unexpected; valid ones: standard, light, dark\n```\n\n# Type\n\n```\nString -> List ComparableVal -> List ComparableVal -> a -> a\n```\n\n# Arguments\n\n- [msg] \n- [valid] \n- [given] \n\n",
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"meta": {
"title": "lib.chooseDevOutputs",
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"signature": "chooseDevOutputs :: [Derivation] -> [String]\n",
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"content": "\nPick the outputs of packages to place in `buildInputs`\n\n# Type\n\n```\nchooseDevOutputs :: [Derivation] -> [String]\n```\n\n# Arguments\n\n- [drvs] List of packages to pick `dev` outputs from\n\n",
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"content": "\nFilters a source tree removing version control files and directories using cleanSourceFilter.\n\n# Example\n\n```nix\ncleanSource ./.\n```\n\n# Arguments\n\n- [src] \n\n",
"source": {
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"content": "\nA basic filter for `cleanSourceWith` that removes\ndirectories of version control system, backup files (*~)\nand some generated files.\n\n# Arguments\n\n- [name] \n- [type] \n\n",
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"content": "\nLike `builtins.filterSource`, except it will compose with itself,\nallowing you to chain multiple calls together without any\nintermediate copies being put in the nix store.\n\n# Example\n\n```nix\nlib.cleanSourceWith {\n filter = f;\n src = lib.cleanSourceWith {\n filter = g;\n src = ./.;\n };\n}\n# Succeeds!\nbuiltins.filterSource f (builtins.filterSource g ./.)\n# Fails!\n```\n\n# Arguments\n\n\n",
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"content": "\nCreate a -D<feature>:STRING=<value> string that can be passed to typical\nCMake invocations.\nThis is the most typical usage, so it deserves a special case.\n\n# Example\n\n```nix\ncmakeFeature \"MODULES\" \"badblock\"\n=> \"-DMODULES:STRING=badblock\"\n```\n\n# Type\n\n```\ncmakeFeature :: string -> string -> string\n @param condition The condition to be made true or false\n @param flag The controlling flag of the condition\n```\n\n# Arguments\n\n- [feature] \n- [value] \n\n",
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"aliases": [["lib", "strings", "cmakeOptionType"]],
"signature": "cmakeOptionType :: string -> string -> string -> string\n @param feature The feature to be set\n @param type The type of the feature to be set, as described in\n https://cmake.org/cmake/help/latest/command/set.html\n the possible values (case insensitive) are:\n BOOL FILEPATH PATH STRING INTERNAL\n @param value The desired value\n",
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},
"content": {
"content": "\nCreate a \"-D<feature>:<type>=<value>\" string that can be passed to typical\nCMake invocations.\n\n# Example\n\n```nix\ncmakeOptionType \"string\" \"ENGINE\" \"sdl2\"\n=> \"-DENGINE:STRING=sdl2\"\n```\n\n# Type\n\n```\ncmakeOptionType :: string -> string -> string -> string\n @param feature The feature to be set\n @param type The type of the feature to be set, as described in\n https://cmake.org/cmake/help/latest/command/set.html\n the possible values (case insensitive) are:\n BOOL FILEPATH PATH STRING INTERNAL\n @param value The desired value\n```\n\n# Arguments\n\n- [type] \n- [feature] \n- [value] \n\n",
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"meta": {
"title": "lib.collect",
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"aliases": [["lib", "attrsets", "collect"]],
"signature": "collect :: (AttrSet -> Bool) -> AttrSet -> [x]\n",
"is_primop": false,
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"content": {
"content": "\nRecursively collect sets that verify a given predicate named `pred`\nfrom the set `attrs`. The recursion is stopped when the predicate is\nverified.\n\n# Example\n\n```nix\ncollect isList { a = { b = [\"b\"]; }; c = [1]; }\n=> [[\"b\"] [1]]\ncollect (x: x ? outPath)\n { a = { outPath = \"a/\"; }; b = { outPath = \"b/\"; }; }\n=> [{ outPath = \"a/\"; } { outPath = \"b/\"; }]\n```\n\n# Type\n\n```\ncollect :: (AttrSet -> Bool) -> AttrSet -> [x]\n```\n\n# Arguments\n\n- [pred] Given an attribute's value, determine if recursion should stop.\n- [attrs] The attribute set to recursively collect.\n\n",
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"meta": {
"title": "lib.commitIdFromGitRepo",
"path": ["lib", "commitIdFromGitRepo"],
"aliases": [["lib", "sources", "commitIdFromGitRepo"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": {
"content": "\nGet the commit id of a git repo.\n\n# Example\n\n```nix\ncommitIdFromGitRepo <nixpkgs/.git>\n```\n\n# Arguments\n\n- [path] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/sources.nix",
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"meta": {
"title": "lib.compare",
"path": ["lib", "compare"],
"aliases": [["lib", "trivial", "compare"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"content": {
"content": "\nC-style comparisons\na < b, compare a b => -1\na == b, compare a b => 0\na > b, compare a b => 1\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"meta": {
"title": "lib.compareLists",
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"signature": null,
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"primop_meta": null,
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"content": {
"content": "\nCompare two lists element-by-element.\n\n# Example\n\n```nix\ncompareLists compare [] []\n=> 0\ncompareLists compare [] [ \"a\" ]\n=> -1\ncompareLists compare [ \"a\" ] []\n=> 1\ncompareLists compare [ \"a\" \"b\" ] [ \"a\" \"c\" ]\n=> -1\n```\n\n# Arguments\n\n- [cmp] \n- [a] \n- [b] \n\n",
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"meta": {
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"path": ["lib", "composeExtensions"],
"aliases": [["lib", "fixedPoints", "composeExtensions"]],
"signature": null,
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"path": ["lib", "fixedPoints", "composeExtensions"],
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"content": {
"content": "\nCompose two extending functions of the type expected by 'extends'\ninto one where changes made in the first are available in the\n'super' of the second\n\n# Arguments\n\n- [f] \n- [g] \n- [final] \n- [prev] \n\n",
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"title": "lib.composeManyExtensions",
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"content": "\nCompose several extending functions of the type expected by 'extends' into\none where changes made in preceding functions are made available to\nsubsequent ones.\n```\ncomposeManyExtensions : [packageSet -> packageSet -> packageSet] -> packageSet -> packageSet -> packageSet\n^final ^prev ^overrides ^final ^prev ^overrides\n```\n",
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"meta": {
"title": "lib.concat",
"path": ["lib", "concat"],
"aliases": [["lib", "trivial", "concat"]],
"signature": "concat :: [a] -> [a] -> [a]\n",
"is_primop": false,
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"content": {
"content": "\nConcatenate two lists\n\n# Example\n\n```nix\nconcat [ 1 2 ] [ 3 4 ]\n=> [ 1 2 3 4 ]\n```\n\n# Type\n\n```\nconcat :: [a] -> [a] -> [a]\n```\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"meta": {
"title": "lib.concatImapStrings",
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"signature": "concatImapStrings :: (int -> a -> string) -> [a] -> string\n",
"is_primop": false,
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"content": {
"content": "\nLike `concatMapStrings` except that the f functions also gets the\nposition as a parameter.\n\n# Example\n\n```nix\nconcatImapStrings (pos: x: \"${toString pos}-${x}\") [\"foo\" \"bar\"]\n=> \"1-foo2-bar\"\n```\n\n# Type\n\n```\nconcatImapStrings :: (int -> a -> string) -> [a] -> string\n```\n\n# Arguments\n\n- [f] \n- [list] \n\n",
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"meta": {
"title": "lib.concatImapStringsSep",
"path": ["lib", "concatImapStringsSep"],
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"signature": "concatIMapStringsSep :: string -> (int -> a -> string) -> [a] -> string\n",
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"content": "\nSame as `concatMapStringsSep`, but the mapping function\nadditionally receives the position of its argument.\n\n# Example\n\n```nix\nconcatImapStringsSep \"-\" (pos: x: toString (x / pos)) [ 6 6 6 ]\n=> \"6-3-2\"\n```\n\n# Type\n\n```\nconcatIMapStringsSep :: string -> (int -> a -> string) -> [a] -> string\n```\n\n# Arguments\n\n- [sep] Separator to add between elements\n- [f] Function that receives elements and their positions\n- [list] List of input strings\n\n",
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"is_primop": false,
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"content": "\nConcatenate a list of strings, adding a newline at the end of each one.\nDefined as `concatMapStrings (s: s + \"\\n\")`.\n\n# Example\n\n```nix\nconcatLines [ \"foo\" \"bar\" ]\n=> \"foo\\nbar\\n\"\n```\n\n# Type\n\n```\nconcatLines :: [string] -> string\n```\n",
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"content_meta": {
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},
"content": {
"content": "\nConcatenate a list of lists into a single list.\n",
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"position": null,
"path": ["lib", "concatLists"],
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}
},
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"meta": {
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"is_primop": true,
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"path": ["lib", "lists", "concatMap"],
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"content": "\nMap and concatenate the result.\n\n# Example\n\n```nix\nconcatMap (x: [x] ++ [\"z\"]) [\"a\" \"b\"]\n=> [ \"a\" \"z\" \"b\" \"z\" ]\n```\n\n# Type\n\n```\nconcatMap :: (a -> [b]) -> [a] -> [b]\n```\n",
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"content": "\nReturn the image of the cross product of some lists by a function.\n\n# Example\n\n```nix\ncrossLists (x:y: \"${toString x}${toString y}\") [[1 2] [3 4]]\n=> [ \"13\" \"14\" \"23\" \"24\" ]\n```\n",
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"content": "\nThis is like `seq e1 e2`, except that *e1* is evaluated *deeply*:\nif it’s a list or set, its elements or attributes are also\nevaluated recursively.\n",
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"content": "\nRemove the first (at most) N elements of a list.\n\n# Example\n\n```nix\ndrop 2 [ \"a\" \"b\" \"c\" \"d\" ]\n=> [ \"c\" \"d\" ]\ndrop 2 [ ]\n=> [ ]\n```\n\n# Type\n\n```\ndrop :: int -> [a] -> [a]\n```\n\n# Arguments\n\n- [count] Number of elements to drop\n- [list] Input list\n\n",
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"content": "\nReturn `true` if a value equal to *x* occurs in the list *xs*, and\n`false` otherwise.\n",
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"content": "\nReturn element *n* from the list *xs*. Elements are counted starting\nfrom 0. A fatal error occurs if the index is out of bounds.\n",
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"content": "\nCreate an --{enable-<feature>=<value>,disable-<feature>} string that can be passed to\nstandard GNU Autoconf scripts.\n\n# Example\n\n```nix\nenableFeatureAs true \"shared\" \"foo\"\n=> \"--enable-shared=foo\"\nenableFeatureAs false \"shared\" (throw \"ignored\")\n=> \"--disable-shared\"\n```\n\n# Arguments\n\n- [flag] \n- [feature] \n- [value] \n\n",
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"content": "\nEscape occurrence of the elements of `list` in `string` by\nprefixing it with a backslash.\n\n# Example\n\n```nix\nescape [\"(\" \")\"] \"(foo)\"\n=> \"\\\\(foo\\\\)\"\n```\n\n# Type\n\n```\nescape :: [string] -> string -> string\n```\n\n# Arguments\n\n- [list] \n\n",
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"content": "\nTurn a string into an exact regular expression\n\n# Example\n\n```nix\nescapeRegex \"[^a-z]*\"\n=> \"\\\\[\\\\^a-z]\\\\*\"\n```\n\n# Type\n\n```\nstring -> string\n```\n",
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"content": "\nQuote string to be used safely within the Bourne shell.\n\n# Example\n\n```nix\nescapeShellArg \"esc'ape\\nme\"\n=> \"'esc'\\\\''ape\\nme'\"\n```\n\n# Type\n\n```\nescapeShellArg :: string -> string\n```\n\n# Arguments\n\n- [arg] \n\n",
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"content": "\nQuote all arguments to be safely passed to the Bourne shell.\n\n# Example\n\n```nix\nescapeShellArgs [\"one\" \"two three\" \"four'five\"]\n=> \"'one' 'two three' 'four'\\\\''five'\"\n```\n\n# Type\n\n```\nescapeShellArgs :: [string] -> string\n```\n",
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"content": "\nEscape the string so it can be safely placed inside a URL\nquery.\n\n# Example\n\n```nix\nescapeURL \"foo/bar baz\"\n=> \"foo%2Fbar%20baz\"\n```\n\n# Type\n\n```\nescapeURL :: string -> string\n```\n",
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"content": "\nEscapes a string such that it is safe to include verbatim in an XML\ndocument.\n\n# Example\n\n```nix\nescapeXML ''\"test\" 'test' < & >''\n=> \"&quot;test&quot; &apos;test&apos; &lt; &amp; &gt;\"\n```\n\n# Type\n\n```\nstring -> string\n```\n",
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"content": "\nSee https://nixos.org/manual/nixpkgs/unstable/#module-system-lib-evalModules\nor file://./../doc/module-system/module-system.chapter.md\n!!! Please think twice before adding to this argument list! The more\nthat is specified here instead of in the modules themselves the harder\nit is to transparently move a set of modules to be a submodule of another\nconfig (as the proper arguments need to be replicated at each call to\nevalModules) and the less declarative the module set is.\n\n# Arguments\n\n\n",
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"content": {
"content": "\nMerge all the definitions of an option to produce the final\nconfig value.\n\n# Arguments\n\n- [loc] \n- [opt] \n- [defs] \n\n",
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"title": "lib.extendDerivation",
"path": ["lib", "extendDerivation"],
"aliases": [["lib", "customisation", "extendDerivation"]],
"signature": "extendDerivation :: Bool -> Any -> Derivation -> Derivation\n",
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"content": "\nAdd attributes to each output of a derivation without changing\nthe derivation itself and check a given condition when evaluating.\n\n# Type\n\n```\nextendDerivation :: Bool -> Any -> Derivation -> Derivation\n```\n\n# Arguments\n\n- [condition] \n- [passthru] \n- [drv] \n\n",
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"aliases": [["lib", "fixedPoints", "extends"]],
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"content": {
"content": "\nModify the contents of an explicitly recursive attribute set in a way that\nhonors `self`-references. This is accomplished with a function\n```nix\ng = self: super: { foo = super.foo + \" + \"; }\n```\nthat has access to the unmodified input (`super`) as well as the final\nnon-recursive representation of the attribute set (`self`). `extends`\ndiffers from the native `//` operator insofar as that it's applied *before*\nreferences to `self` are resolved:\n```\nnix-repl> fix (extends g f)\n{ bar = \"bar\"; foo = \"foo + \"; foobar = \"foo + bar\"; }\n```\nThe name of the function is inspired by object-oriented inheritance, i.e.\nthink of it as an infix operator `g extends f` that mimics the syntax from\nJava. It may seem counter-intuitive to have the \"base class\" as the second\nargument, but it's nice this way if several uses of `extends` are cascaded.\nTo get a better understanding how `extends` turns a function with a fix\npoint (the package set we start with) into a new function with a different fix\npoint (the desired packages set) lets just see, how `extends g f`\nunfolds with `g` and `f` defined above:\n```\nextends g f = self: let super = f self; in super // g self super;\n= self: let super = { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; }; in super // g self super\n= self: { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; } // g self { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; }\n= self: { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; } // { foo = \"foo\" + \" + \"; }\n= self: { foo = \"foo + \"; bar = \"bar\"; foobar = self.foo + self.bar; }\n```\n\n# Arguments\n\n- [f] \n- [rattrs] \n- [self] \n\n",
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{
"meta": {
"title": "lib.fileContents",
"path": ["lib", "fileContents"],
"aliases": [["lib", "strings", "fileContents"]],
"signature": "fileContents :: path -> string\n",
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"content": {
"content": "\nRead the contents of a file removing the trailing \\n\n\n# Example\n\n```nix\n$ echo \"1.0\" > ./version\nfileContents ./version\n=> \"1.0\"\n```\n\n# Type\n\n```\nfileContents :: path -> string\n```\n\n# Arguments\n\n- [file] \n\n",
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{
"meta": {
"title": "lib.filter",
"path": ["lib", "filter"],
"aliases": [
["builtins", "filter"],
["lib", "lists", "filter"],
["lib", "strings", "filter"]
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"signature": null,
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"name": "filter",
"args": ["f", "list"],
"experimental": false,
"arity": 2
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"content": {
"content": "\nReturn a list consisting of the elements of *list* for which the\nfunction *f* returns `true`.\n",
"source": {
"position": null,
"path": ["lib", "filter"],
"pos_type": "Lambda"
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"meta": {
"title": "lib.filterAttrs",
"path": ["lib", "filterAttrs"],
"aliases": [["lib", "attrsets", "filterAttrs"]],
"signature": "filterAttrs :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n",
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"content": {
"content": "\nFilter an attribute set by removing all attributes for which the\ngiven predicate return false.\n\n# Example\n\n```nix\nfilterAttrs (n: v: n == \"foo\") { foo = 1; bar = 2; }\n=> { foo = 1; }\n```\n\n# Type\n\n```\nfilterAttrs :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [pred] Predicate taking an attribute name and an attribute value, which returns `true` to include the attribute, or `false` to exclude the attribute.\n- [set] The attribute set to filter\n\n",
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"meta": {
"title": "lib.filterAttrsRecursive",
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"aliases": [["lib", "attrsets", "filterAttrsRecursive"]],
"signature": "filterAttrsRecursive :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n",
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"path": ["lib", "attrsets", "filterAttrsRecursive"],
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"content": {
"content": "\nFilter an attribute set recursively by removing all attributes for\nwhich the given predicate return false.\n\n# Example\n\n```nix\nfilterAttrsRecursive (n: v: v != null) { foo = { bar = null; }; }\n=> { foo = {}; }\n```\n\n# Type\n\n```\nfilterAttrsRecursive :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [pred] Predicate taking an attribute name and an attribute value, which returns `true` to include the attribute, or `false` to exclude the attribute.\n- [set] The attribute set to filter\n\n",
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"meta": {
"title": "lib.filterOverrides",
"path": ["lib", "filterOverrides"],
"aliases": [["lib", "modules", "filterOverrides"]],
"signature": null,
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"content": {
"content": "\nGiven a list of config values, process the mkOverride properties,\nthat is, return the values that have the highest (that is,\nnumerically lowest) priority, and strip the mkOverride\nproperties. For example,\n[ { file = \"/1\"; value = mkOverride 10 \"a\"; }\n{ file = \"/2\"; value = mkOverride 20 \"b\"; }\n{ file = \"/3\"; value = \"z\"; }\n{ file = \"/4\"; value = mkOverride 10 \"d\"; }\n]\nyields\n[ { file = \"/1\"; value = \"a\"; }\n{ file = \"/4\"; value = \"d\"; }\n]\nNote that \"z\" has the default priority 100.\n\n# Arguments\n\n- [defs] \n\n",
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"meta": {
"title": "lib.findFirst",
"path": ["lib", "findFirst"],
"aliases": [["lib", "lists", "findFirst"]],
"signature": "findFirst :: (a -> bool) -> a -> [a] -> a\n",
"is_primop": false,
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"path": ["lib", "lists", "findFirst"],
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"content": {
"content": "\nFind the first element in the list matching the specified\npredicate or return `default` if no such element exists.\n\n# Example\n\n```nix\nfindFirst (x: x > 3) 7 [ 1 6 4 ]\n=> 6\nfindFirst (x: x > 9) 7 [ 1 6 4 ]\n=> 7\n```\n\n# Type\n\n```\nfindFirst :: (a -> bool) -> a -> [a] -> a\n```\n\n# Arguments\n\n- [pred] Predicate\n- [default] Default value to return\n- [list] Input list\n\n",
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"meta": {
"title": "lib.findSingle",
"path": ["lib", "findSingle"],
"aliases": [["lib", "lists", "findSingle"]],
"signature": "findSingle :: (a -> bool) -> a -> a -> [a] -> a\n",
"is_primop": false,
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"content": {
"content": "\nFind the sole element in the list matching the specified\npredicate, returns `default` if no such element exists, or\n`multiple` if there are multiple matching elements.\n\n# Example\n\n```nix\nfindSingle (x: x == 3) \"none\" \"multiple\" [ 1 3 3 ]\n=> \"multiple\"\nfindSingle (x: x == 3) \"none\" \"multiple\" [ 1 3 ]\n=> 3\nfindSingle (x: x == 3) \"none\" \"multiple\" [ 1 9 ]\n=> \"none\"\n```\n\n# Type\n\n```\nfindSingle :: (a -> bool) -> a -> a -> [a] -> a\n```\n\n# Arguments\n\n- [pred] Predicate\n- [default] Default value to return if element was not found.\n- [multiple] Default value to return if more than one element was found\n- [list] Input list\n\n",
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"meta": {
"title": "lib.fix",
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"aliases": [["lib", "fixedPoints", "fix"]],
"signature": "fix :: (a -> a) -> a\n",
"is_primop": false,
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"content": {
"content": "\n`fix f` computes the fixed point of the given function `f`. In other words, the return value is `x` in `x = f x`.\n`f` must be a lazy function.\nThis means that `x` must be a value that can be partially evaluated,\nsuch as an attribute set, a list, or a function.\nThis way, `f` can use one part of `x` to compute another part.\n**Relation to syntactic recursion**\nThis section explains `fix` by refactoring from syntactic recursion to a call of `fix` instead.\nFor context, Nix lets you define attributes in terms of other attributes syntactically using the [`rec { }` syntax](https://nixos.org/manual/nix/stable/language/constructs.html#recursive-sets).\n```nix\nnix-repl> rec {\nfoo = \"foo\";\nbar = \"bar\";\nfoobar = foo + bar;\n}\n{ bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\n```\nThis is convenient when constructing a value to pass to a function for example,\nbut an equivalent effect can be achieved with the `let` binding syntax:\n```nix\nnix-repl> let self = {\nfoo = \"foo\";\nbar = \"bar\";\nfoobar = self.foo + self.bar;\n}; in self\n{ bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\n```\nBut in general you can get more reuse out of `let` bindings by refactoring them to a function.\n```nix\nnix-repl> f = self: {\nfoo = \"foo\";\nbar = \"bar\";\nfoobar = self.foo + self.bar;\n}\n```\nThis is where `fix` comes in, it contains the syntactic recursion that's not in `f` anymore.\n```nix\nnix-repl> fix = f:\nlet self = f self; in self;\n```\nBy applying `fix` we get the final result.\n```nix\nnix-repl> fix f\n{ bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\n```\nSuch a refactored `f` using `fix` is not useful by itself.\nSee [`extends`](#function-library-lib.fixedPoints.extends) for an example use case.\nThere `self` is also often called `final`.\n\n# Example\n\n```nix\nfix (self: { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; })\n=> { bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\nfix (self: [ 1 2 (elemAt self 0 + elemAt self 1) ])\n=> [ 1 2 3 ]\n```\n\n# Type\n\n```\nfix :: (a -> a) -> a\n```\n\n# Arguments\n\n- [f] \n\n",
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"meta": {
"title": "lib.fix' (Prime)",
"path": ["lib", "fix'"],
"aliases": [["lib", "fixedPoints", "fix'"]],
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"content": "\nA variant of `fix` that records the original recursive attribute set in the\nresult, in an attribute named `__unfix__`.\nThis is useful in combination with the `extends` function to\nimplement deep overriding.\n\n# Arguments\n\n- [f] \n\n",
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"content": "\nCompatibility.\n\n# Arguments\n\n- [modules] \n- [args] \n\n",
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"title": "lib.fixedWidthNumber",
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"content": "\nFormat a number adding leading zeroes up to fixed width.\n\n# Example\n\n```nix\nfixedWidthNumber 5 15\n=> \"00015\"\n```\n\n# Arguments\n\n- [width] \n- [n] \n\n",
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"signature": "fixedWidthString :: int -> string -> string -> string\n",
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"content": "\nCreate a fixed width string with additional prefix to match\nrequired width.\nThis function will fail if the input string is longer than the\nrequested length.\n\n# Example\n\n```nix\nfixedWidthString 5 \"0\" (toString 15)\n=> \"00015\"\n```\n\n# Type\n\n```\nfixedWidthString :: int -> string -> string -> string\n```\n\n# Arguments\n\n- [width] \n- [filler] \n- [str] \n\n",
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"title": "lib.flatten",
"path": ["lib", "flatten"],
"aliases": [["lib", "lists", "flatten"]],
"signature": null,
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"primop_meta": null,
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"content": {
"content": "\nFlatten the argument into a single list; that is, nested lists are\nspliced into the top-level lists.\n\n# Example\n\n```nix\nflatten [1 [2 [3] 4] 5]\n=> [1 2 3 4 5]\nflatten 1\n=> [1]\n```\n\n# Arguments\n\n- [x] \n\n",
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"meta": {
"title": "lib.flip",
"path": ["lib", "flip"],
"aliases": [["lib", "trivial", "flip"]],
"signature": "flip :: (a -> b -> c) -> (b -> a -> c)\n",
"is_primop": false,
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"path": ["lib", "trivial", "flip"],
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"content": {
"content": "\nFlip the order of the arguments of a binary function.\n\n# Example\n\n```nix\nflip concat [1] [2]\n=> [ 2 1 ]\n```\n\n# Type\n\n```\nflip :: (a -> b -> c) -> (b -> a -> c)\n```\n\n# Arguments\n\n- [f] \n- [a] \n- [b] \n\n",
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"content": {
"content": "\n`fold` is an alias of `foldr` for historic reasons\n",
"source": {
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"title": "lib.foldArgs",
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"meta": {
"title": "lib.foldAttrs",
"path": ["lib", "foldAttrs"],
"aliases": [["lib", "attrsets", "foldAttrs"]],
"signature": "foldAttrs :: (Any -> Any -> Any) -> Any -> [AttrSets] -> Any\n",
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"content": {
"content": "\nApply fold functions to values grouped by key.\n\n# Example\n\n```nix\nfoldAttrs (item: acc: [item] ++ acc) [] [{ a = 2; } { a = 3; }]\n=> { a = [ 2 3 ]; }\n```\n\n# Type\n\n```\nfoldAttrs :: (Any -> Any -> Any) -> Any -> [AttrSets] -> Any\n```\n\n# Arguments\n\n- [op] A function, given a value and a collector combines the two.\n- [nul] The starting value.\n- [list_of_attrs] A list of attribute sets to fold together by key.\n\n",
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"content": "\n“left fold”, like `foldr`, but from the left:\n`foldl op nul [x_1 x_2 ... x_n] == op (... (op (op nul x_1) x_2) ... x_n)`.\n\n# Example\n\n```nix\nlconcat = foldl (a: b: a + b) \"z\"\nlconcat [ \"a\" \"b\" \"c\" ]\n=> \"zabc\"\n# different types\nlstrange = foldl (str: int: str + toString (int + 1)) \"a\"\nlstrange [ 1 2 3 4 ]\n=> \"a2345\"\n```\n\n# Type\n\n```\nfoldl :: (b -> a -> b) -> b -> [a] -> b\n```\n\n# Arguments\n\n- [op] \n- [nul] \n- [list] \n\n",
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"meta": {
"title": "lib.foldl' (Prime)",
"path": ["lib", "foldl'"],
"aliases": [["lib", "lists", "foldl'"]],
"signature": "foldl' :: (acc -> x -> acc) -> acc -> [x] -> acc\n",
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"content": {
"content": "\nReduce a list by applying a binary operator from left to right,\nstarting with an initial accumulator.\nBefore each application of the operator, the accumulator value is evaluated.\nThis behavior makes this function stricter than [`foldl`](#function-library-lib.lists.foldl).\nUnlike [`builtins.foldl'`](https://nixos.org/manual/nix/unstable/language/builtins.html#builtins-foldl'),\nthe initial accumulator argument is evaluated before the first iteration.\nA call like\n```nix\nfoldl' op acc₀ [ x₀ x₁ x₂ ... xₙ₋₁ xₙ ]\n```\nis (denotationally) equivalent to the following,\nbut with the added benefit that `foldl'` itself will never overflow the stack.\n```nix\nlet\nacc₁ = builtins.seq acc₀ (op acc₀ x₀ );\nacc₂ = builtins.seq acc₁ (op acc₁ x₁ );\nacc₃ = builtins.seq acc₂ (op acc₂ x₂ );\n...\naccₙ = builtins.seq accₙ₋₁ (op accₙ₋₁ xₙ₋₁);\naccₙ₊₁ = builtins.seq accₙ (op accₙ xₙ );\nin\naccₙ₊₁\n# Or ignoring builtins.seq\nop (op (... (op (op (op acc₀ x₀) x₁) x₂) ...) xₙ₋₁) xₙ\n```\n\n# Example\n\n```nix\nfoldl' (acc: x: acc + x) 0 [1 2 3]\n=> 6\n```\n\n# Type\n\n```\nfoldl' :: (acc -> x -> acc) -> acc -> [x] -> acc\n```\n\n# Arguments\n\n- [op] The binary operation to run, where the two arguments are: \n 1. `acc`: The current accumulator value: Either the initial one for the first iteration, or the result of the previous iteration\n 2. `x`: The corresponding list element for this iteration\n\n- [acc] The initial accumulator value\n- [list] The list to fold\n\n",
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"aliases": [["lib", "attrsets", "foldlAttrs"]],
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"content": {
"content": "\nLike [`lib.lists.foldl'`](#function-library-lib.lists.foldl-prime) but for attribute sets.\nIterates over every name-value pair in the given attribute set.\nThe result of the callback function is often called `acc` for accumulator. It is passed between callbacks from left to right and the final `acc` is the return value of `foldlAttrs`.\nAttention:\nThere is a completely different function\n`lib.foldAttrs`\nwhich has nothing to do with this function, despite the similar name.\n\n# Example\n\n```nix\nfoldlAttrs\n (acc: name: value: {\n sum = acc.sum + value;\n names = acc.names ++ [name];\n })\n { sum = 0; names = []; }\n {\n foo = 1;\n bar = 10;\n }\n->\n {\n sum = 11;\n names = [\"bar\" \"foo\"];\n }\nfoldlAttrs\n (throw \"function not needed\")\n 123\n {};\n->\n 123\nfoldlAttrs\n (acc: _: _: acc)\n 3\n { z = throw \"value not needed\"; a = throw \"value not needed\"; };\n->\n 3\nThe accumulator doesn't have to be an attrset.\nIt can be as simple as a number or string.\nfoldlAttrs\n (acc: _: v: acc * 10 + v)\n 1\n { z = 1; a = 2; };\n->\n 121\n```\n\n# Type\n\n```\nfoldlAttrs :: ( a -> String -> b -> a ) -> a -> { ... :: b } -> a\n```\n\n# Arguments\n\n- [f] \n- [init] \n- [set] \n\n",
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"path": ["lib", "foldr"],
"aliases": [["lib", "lists", "foldr"]],
"signature": "foldr :: (a -> b -> b) -> b -> [a] -> b\n",
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"content": "\n“right fold” a binary function `op` between successive elements of\n`list` with `nul` as the starting value, i.e.,\n`foldr op nul [x_1 x_2 ... x_n] == op x_1 (op x_2 ... (op x_n nul))`.\n\n# Example\n\n```nix\nconcat = foldr (a: b: a + b) \"z\"\nconcat [ \"a\" \"b\" \"c\" ]\n=> \"abcz\"\n# different types\nstrange = foldr (int: str: toString (int + 1) + str) \"a\"\nstrange [ 1 2 3 4 ]\n=> \"2345a\"\n```\n\n# Type\n\n```\nfoldr :: (a -> b -> b) -> b -> [a] -> b\n```\n\n# Arguments\n\n- [op] \n- [nul] \n- [list] \n\n",
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"meta": {
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"content": "\nApply the function to each element in the list. Same as `map`, but arguments\nflipped.\n\n# Example\n\n```nix\nforEach [ 1 2 ] (x:\n toString x\n)\n=> [ \"1\" \"2\" ]\n```\n\n# Type\n\n```\nforEach :: [a] -> (a -> b) -> [b]\n```\n\n# Arguments\n\n- [xs] \n- [f] \n\n",
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"meta": {
"title": "lib.fullDepEntry",
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"aliases": [["lib", "stringsWithDeps", "fullDepEntry"]],
"signature": null,
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"primop_meta": null,
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"aliases": [["lib", "trivial", "functionArgs"]],
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"content": "\nExtract the expected function arguments from a function.\nThis works both with nix-native { a, b ? foo, ... }: style\nfunctions and functions with args set with 'setFunctionArgs'. It\nhas the same return type and semantics as builtins.functionArgs.\nsetFunctionArgs : (a → b) → Map String Bool.\n\n# Arguments\n\n- [f] \n\n",
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"title": "lib.genAttrs",
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"aliases": [["lib", "attrsets", "genAttrs"]],
"signature": "genAttrs :: [ String ] -> (String -> Any) -> AttrSet\n",
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"primop_meta": null,
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"content": {
"content": "\nGenerate an attribute set by mapping a function over a list of\nattribute names.\n\n# Example\n\n```nix\ngenAttrs [ \"foo\" \"bar\" ] (name: \"x_\" + name)\n=> { foo = \"x_foo\"; bar = \"x_bar\"; }\n```\n\n# Type\n\n```\ngenAttrs :: [ String ] -> (String -> Any) -> AttrSet\n```\n\n# Arguments\n\n- [names] Names of values in the resulting attribute set.\n- [f] A function, given the name of the attribute, returns the attribute's value.\n\n",
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"meta": {
"title": "lib.genList",
"path": ["lib", "genList"],
"aliases": [
["builtins", "genList"],
["lib", "lists", "genList"],
["lib", "strings", "genList"]
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"signature": null,
"is_primop": true,
"primop_meta": {
"name": "genList",
"args": ["generator", "length"],
"experimental": false,
"arity": 2
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"content": {
"content": "\nGenerate list of size *length*, with each element *i* equal to the\nvalue returned by *generator* `i`. For example,\n\n```nix\nbuiltins.genList (x: x * x) 5\n```\n\nreturns the list `[ 0 1 4 9 16 ]`.\n",
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"path": ["lib", "genList"],
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"meta": {
"title": "lib.genericClosure",
"path": ["lib", "genericClosure"],
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["builtins", "genericClosure"],
["lib", "trivial", "genericClosure"]
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"signature": null,
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"name": "genericClosure",
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"content": "\nTakes an *attrset* with the following attributes:\n\n- `startSet` [ Item ]\n - A list of start items. Each item must be an attrset containing a `key`. The `key` must be comparable.\n- `operator` Item -> [ Item ]\n - A function\n\nreturns a *list of attrsets*\n\nGenericClosure starts with the `startSet` and recursively\napplying the `operator` function to each `item`. The *attrsets* in the\n`startSet` and the *attrsets* produced by `operator` must contain a value\nnamed `key` which is comparable. The result is produced by calling `operator`\nfor each `item` with a value for `key` that has not been called yet including\nnewly produced `item`s. The function terminates when no new `item`s are\nproduced. The resulting *list of attrsets* contains only *attrsets* with a\nunique key. For example,\n\n```\nbuiltins.genericClosure {\n startSet = [ {key = 5;} ];\n operator = item: [{\n key = if (item.key / 2 ) * 2 == item.key\n then item.key / 2\n else 3 * item.key + 1;\n }];\n}\n```\nevaluates to\n```\n[ { key = 5; } { key = 16; } { key = 8; } { key = 4; } { key = 2; } { key = 1; } ]\n```\n",
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"meta": {
"title": "lib.getAttr",
"path": ["lib", "getAttr"],
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"signature": null,
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"name": "getAttr",
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"content": "\n`getAttr` returns the attribute named *s* from *set*. Evaluation\naborts if the attribute doesn’t exist. This is a dynamic version of\nthe `.` operator, since *s* is an expression rather than an\nidentifier.\n",
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"position": null,
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"meta": {
"title": "lib.getAttrFromPath",
"path": ["lib", "getAttrFromPath"],
"aliases": [["lib", "attrsets", "getAttrFromPath"]],
"signature": "getAttrFromPath :: [String] -> AttrSet -> Any\n",
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"content": {
"content": "\nLike `attrByPath`, but without a default value. If it doesn't find the\npath it will throw an error.\n\n# Example\n\n```nix\nx = { a = { b = 3; }; }\ngetAttrFromPath [\"a\" \"b\"] x\n=> 3\ngetAttrFromPath [\"z\" \"z\"] x\n=> error: cannot find attribute `z.z'\n```\n\n# Type\n\n```\ngetAttrFromPath :: [String] -> AttrSet -> Any\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to get from `set`\n- [set] The nested attribute set to find the value in.\n\n",
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"meta": {
"title": "lib.getAttrs",
"path": ["lib", "getAttrs"],
"aliases": [["lib", "attrsets", "getAttrs"]],
"signature": "getAttrs :: [String] -> AttrSet -> AttrSet\n",
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"content": {
"content": "\nGiven a set of attribute names, return the set of the corresponding\nattributes from the given set.\n\n# Example\n\n```nix\ngetAttrs [ \"a\" \"b\" ] { a = 1; b = 2; c = 3; }\n=> { a = 1; b = 2; }\n```\n\n# Type\n\n```\ngetAttrs :: [String] -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [names] A list of attribute names to get out of `set`\n- [attrs] The set to get the named attributes from\n\n",
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"meta": {
"title": "lib.getBin",
"path": ["lib", "getBin"],
"aliases": [["lib", "attrsets", "getBin"]],
"signature": "getBin :: Derivation -> String\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nGet a package's `bin` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetBin pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r\"\n```\n\n# Type\n\n```\ngetBin :: Derivation -> String\n```\n",
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"meta": {
"title": "lib.getDev",
"path": ["lib", "getDev"],
"aliases": [["lib", "attrsets", "getDev"]],
"signature": "getDev :: Derivation -> String\n",
"is_primop": false,
"primop_meta": null,
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"content": "\nGet a package's `dev` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetDev pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev\"\n```\n\n# Type\n\n```\ngetDev :: Derivation -> String\n```\n",
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"meta": {
"title": "lib.getExe",
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"aliases": [["lib", "meta", "getExe"]],
"signature": "getExe :: package -> string\n",
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"content": {
"content": "\nGet the path to the main program of a package based on meta.mainProgram\n\n# Example\n\n```nix\ngetExe pkgs.hello\n=> \"/nix/store/g124820p9hlv4lj8qplzxw1c44dxaw1k-hello-2.12/bin/hello\"\ngetExe pkgs.mustache-go\n=> \"/nix/store/am9ml4f4ywvivxnkiaqwr0hyxka1xjsf-mustache-go-1.3.0/bin/mustache\"\n```\n\n# Type\n\n```\ngetExe :: package -> string\n```\n\n# Arguments\n\n- [x] \n\n",
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"meta": {
"title": "lib.getExe' (Prime)",
"path": ["lib", "getExe'"],
"aliases": [["lib", "meta", "getExe'"]],
"signature": "getExe' :: derivation -> string -> string\n",
"is_primop": false,
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"content": "\nGet the path of a program of a derivation.\n\n# Example\n\n```nix\ngetExe' pkgs.hello \"hello\"\n=> \"/nix/store/g124820p9hlv4lj8qplzxw1c44dxaw1k-hello-2.12/bin/hello\"\ngetExe' pkgs.imagemagick \"convert\"\n=> \"/nix/store/5rs48jamq7k6sal98ymj9l4k2bnwq515-imagemagick-7.1.1-15/bin/convert\"\n```\n\n# Type\n\n```\ngetExe' :: derivation -> string -> string\n```\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"meta": {
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"content": "\nExtracts values of all \"file\" keys of the given list\n\n# Example\n\n```nix\ngetFiles [ { file = \"file1\"; } { file = \"file2\"; } ] // => [ \"file1\" \"file2\" ]\ngetFiles [ ] // => [ ]\n```\n\n# Type\n\n```\ngetFiles :: [ { file :: a; } ] -> [a]\n```\n",
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"content": "\nGet a package's `lib` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetLib pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-lib\"\n```\n\n# Type\n\n```\ngetLib :: Derivation -> String\n```\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 1421,
"column": 3
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"path": ["lib", "attrsets", "getLib"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.getLicenseFromSpdxId",
"path": ["lib", "getLicenseFromSpdxId"],
"aliases": [["lib", "meta", "getLicenseFromSpdxId"]],
"signature": "getLicenseFromSpdxId :: str -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 121,
"column": 24
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 211,
"column": 8
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"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 207,
"column": 3
},
"path": ["lib", "meta", "getLicenseFromSpdxId"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nGet the corresponding attribute in lib.licenses\nfrom the SPDX ID.\nFor SPDX IDs, see\nhttps://spdx.org/licenses\n\n# Example\n\n```nix\nlib.getLicenseFromSpdxId \"MIT\" == lib.licenses.mit\n=> true\nlib.getLicenseFromSpdxId \"mIt\" == lib.licenses.mit\n=> true\nlib.getLicenseFromSpdxId \"MY LICENSE\"\n=> trace: warning: getLicenseFromSpdxId: No license matches the given SPDX ID: MY LICENSE\n=> { shortName = \"MY LICENSE\"; }\n```\n\n# Type\n\n```\ngetLicenseFromSpdxId :: str -> AttrSet\n```\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 207,
"column": 3
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"path": ["lib", "meta", "getLicenseFromSpdxId"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.getMan",
"path": ["lib", "getMan"],
"aliases": [["lib", "attrsets", "getMan"]],
"signature": "getMan :: Derivation -> String\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 82,
"column": 28
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 1379,
"column": 23
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"count_applied": 1,
"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 1461,
"column": 3
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"path": ["lib", "attrsets", "getMan"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nGet a package's `man` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetMan pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-man\"\n```\n\n# Type\n\n```\ngetMan :: Derivation -> String\n```\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 1461,
"column": 3
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"path": ["lib", "attrsets", "getMan"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.getName",
"path": ["lib", "getName"],
"aliases": [["lib", "strings", "getName"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
"column": 27
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 1200,
"column": 13
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 1200,
"column": 3
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"path": ["lib", "strings", "getName"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nThis function takes an argument that's either a derivation or a\nderivation's \"name\" attribute and extracts the name part from that\nargument.\n\n# Example\n\n```nix\ngetName \"youtube-dl-2016.01.01\"\n=> \"youtube-dl\"\ngetName pkgs.youtube-dl\n=> \"youtube-dl\"\n```\n\n# Arguments\n\n- [x] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 1200,
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"path": ["lib", "strings", "getName"],
"pos_type": "Attribute"
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{
"meta": {
"title": "lib.getOutput",
"path": ["lib", "getOutput"],
"aliases": [["lib", "attrsets", "getOutput"]],
"signature": "getOutput :: String -> Derivation -> String\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 82,
"column": 28
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 1379,
"column": 15
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"content_meta": {
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"path": ["lib", "attrsets", "getOutput"],
"pos_type": "Attribute"
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"content": {
"content": "\nGet a package output.\nIf no output is found, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetOutput \"dev\" pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev\"\n```\n\n# Type\n\n```\ngetOutput :: String -> Derivation -> String\n```\n\n# Arguments\n\n- [output] \n- [pkg] \n\n",
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"path": ["lib", "attrsets", "getOutput"],
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}
},
{
"meta": {
"title": "lib.getValue",
"path": ["lib", "getValue"],
"aliases": [["lib", "misc", "getValue"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/deprecated.nix",
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"path": ["lib", "getValue"],
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"content": null,
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"path": ["lib", "getValue"],
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},
{
"meta": {
"title": "lib.getValues",
"path": ["lib", "getValues"],
"aliases": [["lib", "options", "getValues"]],
"signature": "getValues :: [ { value :: a; } ] -> [a]\n",
"is_primop": true,
"primop_meta": {
"name": null,
"args": null,
"experimental": null,
"arity": null
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"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 141,
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"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/options.nix",
"line": 327,
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"path": ["lib", "options", "getValues"],
"pos_type": "Attribute"
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"content": {
"content": "\nExtracts values of all \"value\" keys of the given list.\n\n# Example\n\n```nix\ngetValues [ { value = 1; } { value = 2; } ] // => [ 1 2 ]\ngetValues [ ] // => [ ]\n```\n\n# Type\n\n```\ngetValues :: [ { value :: a; } ] -> [a]\n```\n",
"source": {
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"line": 327,
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"path": ["lib", "options", "getValues"],
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{
"meta": {
"title": "lib.getVersion",
"path": ["lib", "getVersion"],
"aliases": [["lib", "strings", "getVersion"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
"column": 27
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
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"path": ["lib", "strings", "getVersion"],
"pos_type": "Attribute"
}
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"content": {
"content": "\nThis function takes an argument that's either a derivation or a\nderivation's \"name\" attribute and extracts the version part from that\nargument.\n\n# Example\n\n```nix\ngetVersion \"youtube-dl-2016.01.01\"\n=> \"2016.01.01\"\ngetVersion pkgs.youtube-dl\n=> \"2016.01.01\"\n```\n\n# Arguments\n\n- [x] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
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"path": ["lib", "strings", "getVersion"],
"pos_type": "Attribute"
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},
{
"meta": {
"title": "lib.groupBy",
"path": ["lib", "groupBy"],
"aliases": [
["builtins", "groupBy"],
["lib", "lists", "groupBy"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "groupBy",
"args": ["f", "list"],
"experimental": false,
"arity": 2
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"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
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"lambda_position": null,
"count_applied": 0,
"content_meta": {
"position": null,
"path": ["lib", "groupBy"],
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},
"content": {
"content": "\nGroups elements of *list* together by the string returned from the\nfunction *f* called on each element. It returns an attribute set\nwhere each attribute value contains the elements of *list* that are\nmapped to the same corresponding attribute name returned by *f*.\n\nFor example,\n\n```nix\nbuiltins.groupBy (builtins.substring 0 1) [\"foo\" \"bar\" \"baz\"]\n```\n\nevaluates to\n\n```nix\n{ b = [ \"bar\" \"baz\" ]; f = [ \"foo\" ]; }\n```\n",
"source": {
"position": null,
"path": ["lib", "groupBy"],
"pos_type": "Lambda"
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}
},
{
"meta": {
"title": "lib.groupBy' (Prime)",
"path": ["lib", "groupBy'"],
"aliases": [["lib", "lists", "groupBy'"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
"column": 25
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 745,
"column": 14
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"line": 745,
"column": 3
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"path": ["lib", "lists", "groupBy'"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nSplits the elements of a list into many lists, using the return value of a predicate.\nPredicate should return a string which becomes keys of attrset `groupBy` returns.\n`groupBy'` allows to customise the combining function and initial value\n\n# Example\n\n```nix\ngroupBy (x: boolToString (x > 2)) [ 5 1 2 3 4 ]\n=> { true = [ 5 3 4 ]; false = [ 1 2 ]; }\ngroupBy (x: x.name) [ {name = \"icewm\"; script = \"icewm &\";}\n {name = \"xfce\"; script = \"xfce4-session &\";}\n {name = \"icewm\"; script = \"icewmbg &\";}\n {name = \"mate\"; script = \"gnome-session &\";}\n ]\n=> { icewm = [ { name = \"icewm\"; script = \"icewm &\"; }\n { name = \"icewm\"; script = \"icewmbg &\"; } ];\n mate = [ { name = \"mate\"; script = \"gnome-session &\"; } ];\n xfce = [ { name = \"xfce\"; script = \"xfce4-session &\"; } ];\n }\ngroupBy' builtins.add 0 (x: boolToString (x > 2)) [ 5 1 2 3 4 ]\n=> { true = 12; false = 3; }\n```\n\n# Arguments\n\n- [op] \n- [nul] \n- [pred] \n- [lst] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 745,
"column": 3
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"path": ["lib", "lists", "groupBy'"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.hasAttr",
"path": ["lib", "hasAttr"],
"aliases": [
["builtins", "hasAttr"],
["lib", "attrsets", "hasAttr"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "hasAttr",
"args": ["s", "set"],
"experimental": false,
"arity": 2
},
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 68,
"column": 23
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"lambda_position": null,
"count_applied": 0,
"content_meta": {
"position": null,
"path": ["lib", "hasAttr"],
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}
},
"content": {
"content": "\n`hasAttr` returns `true` if *set* has an attribute named *s*, and\n`false` otherwise. This is a dynamic version of the `?` operator,\nsince *s* is an expression rather than an identifier.\n",
"source": {
"position": null,
"path": ["lib", "hasAttr"],
"pos_type": "Lambda"
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}
},
{
"meta": {
"title": "lib.hasAttrByPath",
"path": ["lib", "hasAttrByPath"],
"aliases": [["lib", "attrsets", "hasAttrByPath"]],
"signature": "hasAttrByPath :: [String] -> AttrSet -> Bool\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 82,
"column": 28
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 84,
"column": 5
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"content_meta": {
"position": {
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"line": 82,
"column": 3
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"path": ["lib", "attrsets", "hasAttrByPath"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nReturn if an attribute from nested attribute set exists.\n\n# Example\n\n```nix\nx = { a = { b = 3; }; }\nhasAttrByPath [\"a\" \"b\"] x\n=> true\nhasAttrByPath [\"z\" \"z\"] x\n=> false\n```\n\n# Type\n\n```\nhasAttrByPath :: [String] -> AttrSet -> Bool\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to check from `set`\n- [e] The nested attribute set to check\n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 82,
"column": 3
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"path": ["lib", "attrsets", "hasAttrByPath"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.hasInfix",
"path": ["lib", "hasInfix"],
"aliases": [["lib", "strings", "hasInfix"]],
"signature": "hasInfix :: string -> string -> bool\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
"column": 27
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 550,
"column": 14
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"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 550,
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"path": ["lib", "strings", "hasInfix"],
"pos_type": "Attribute"
}
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"content": {
"content": "\nDetermine whether a string contains the given infix\n\n# Example\n\n```nix\nhasInfix \"bc\" \"abcd\"\n=> true\nhasInfix \"ab\" \"abcd\"\n=> true\nhasInfix \"cd\" \"abcd\"\n=> true\nhasInfix \"foo\" \"abcd\"\n=> false\n```\n\n# Type\n\n```\nhasInfix :: string -> string -> bool\n```\n\n# Arguments\n\n- [infix] \n- [content] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
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"path": ["lib", "strings", "hasInfix"],
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},
{
"meta": {
"title": "lib.hasPrefix",
"path": ["lib", "hasPrefix"],
"aliases": [
["lib", "lists", "hasPrefix"],
["lib", "path", "hasPrefix"],
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],
"signature": "hasPrefix :: [a] -> [a] -> bool\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
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"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 1096,
"column": 3
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"path": ["lib", "lists", "hasPrefix"],
"pos_type": "Attribute"
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"content": {
"content": "\nWhether the first list is a prefix of the second list.\n\n# Example\n\n```nix\nhasPrefix [ 1 2 ] [ 1 2 3 4 ]\n=> true\nhasPrefix [ 0 1 ] [ 1 2 3 4 ]\n=> false\n```\n\n# Type\n\n```\nhasPrefix :: [a] -> [a] -> bool\n```\n\n# Arguments\n\n- [list1] \n- [list2] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
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"meta": {
"title": "lib.hasSuffix",
"path": ["lib", "hasSuffix"],
"aliases": [["lib", "strings", "hasSuffix"]],
"signature": "hasSuffix :: string -> string -> bool\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
"column": 27
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 501,
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"pos_type": "Attribute"
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"content": {
"content": "\nDetermine whether a string has given suffix.\n\n# Example\n\n```nix\nhasSuffix \"foo\" \"foobar\"\n=> false\nhasSuffix \"foo\" \"barfoo\"\n=> true\n```\n\n# Type\n\n```\nhasSuffix :: string -> string -> bool\n```\n\n# Arguments\n\n- [suffix] Suffix to check for\n- [content] Input string\n\n",
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"signature": null,
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"content": "\nReturn the first element of a list; abort evaluation if the argument\nisn’t a list or is an empty list. You can test whether a list is\nempty by comparing it with `[]`.\n",
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"meta": {
"title": "lib.hiPrio",
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["pkgs", "hiPrio"]
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"content": "\nIncrease the nix-env priority of the package, i.e., this\nversion/variant of the package will be preferred.\n",
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"content": "\nStrip a derivation of all non-essential attributes, returning\nonly those needed by hydra-eval-jobs. Also strictly evaluate the\nresult to ensure that there are no thunks kept alive to prevent\ngarbage collection.\n\n# Type\n\n```\nhydraJob :: (Derivation | Null) -> (Derivation | Null)\n```\n\n# Arguments\n\n- [drv] \n\n",
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"content": "\nThe identity function\nFor when you need a function that does “nothing”.\n\n# Type\n\n```\nid :: a -> a\n```\n\n# Arguments\n\n- [x] The value to return\n\n",
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"content": {
"content": "\ndeprecated:\nFor historical reasons, imap has an index starting at 1.\nBut for consistency with the rest of the library we want an index\nstarting at zero.\n",
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"content": "\nMap with index starting from 1\n\n# Example\n\n```nix\nimap1 (i: v: \"${v}-${toString i}\") [\"a\" \"b\"]\n=> [ \"a-1\" \"b-2\" ]\n```\n\n# Type\n\n```\nimap1 :: (int -> a -> b) -> [a] -> [b]\n```\n\n# Arguments\n\n- [f] \n- [list] \n\n",
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"signature": "importJSON :: path -> any\n",
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"content": "\nReads a JSON file.\n\n# Type\n\n```\nimportJSON :: path -> any\n```\n\n# Arguments\n\n- [path] \n\n",
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"content": "\nReturn all elements but the last.\nThis function throws an error if the list is empty.\n\n# Example\n\n```nix\ninit [ 1 2 3 ]\n=> [ 1 2 ]\n```\n\n# Type\n\n```\ninit :: [a] -> [a]\n```\n\n# Arguments\n\n- [list] \n\n",
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 1236,
"column": 3
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"path": ["lib", "lists", "last"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.lazyDerivation",
"path": ["lib", "lazyDerivation"],
"aliases": [["lib", "derivations", "lazyDerivation"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 120,
"column": 31
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/derivations.nix",
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"content": {
"content": "\nRestrict a derivation to a predictable set of attribute names, so\nthat the returned attrset is not strict in the actual derivation,\nsaving a lot of computation when the derivation is non-trivial.\nThis is useful in situations where a derivation might only be used for its\npassthru attributes, improving evaluation performance.\nThe returned attribute set is lazy in `derivation`. Specifically, this\nmeans that the derivation will not be evaluated in at least the\nsituations below.\nFor illustration and/or testing, we define derivation such that its\nevaluation is very noticeable.\nlet derivation = throw \"This won't be evaluated.\";\nIn the following expressions, `derivation` will _not_ be evaluated:\n(lazyDerivation { inherit derivation; }).type\nattrNames (lazyDerivation { inherit derivation; })\n(lazyDerivation { inherit derivation; } // { foo = true; }).foo\n(lazyDerivation { inherit derivation; meta.foo = true; }).meta\nIn these expressions, `derivation` _will_ be evaluated:\n\"${lazyDerivation { inherit derivation }}\"\n(lazyDerivation { inherit derivation }).outPath\n(lazyDerivation { inherit derivation }).meta\nAnd the following expressions are not valid, because the refer to\nimplementation details and/or attributes that may not be present on\nsome derivations:\n(lazyDerivation { inherit derivation }).buildInputs\n(lazyDerivation { inherit derivation }).passthru\n(lazyDerivation { inherit derivation }).pythonPath\n\n# Arguments\n\n\n",
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{
"meta": {
"title": "lib.lazyGenericClosure",
"path": ["lib", "lazyGenericClosure"],
"aliases": [["lib", "misc", "lazyGenericClosure"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"path": ["lib", "lazyGenericClosure"],
"pos_type": "Lambda"
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}
},
{
"meta": {
"title": "lib.length",
"path": ["lib", "length"],
"aliases": [
["builtins", "length"],
["lib", "lists", "length"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "length",
"args": ["e"],
"experimental": false,
"arity": 1
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"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"position": null,
"path": ["lib", "length"],
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}
},
"content": {
"content": "\nReturn the length of the list *e*.\n",
"source": {
"position": null,
"path": ["lib", "length"],
"pos_type": "Lambda"
}
}
},
{
"meta": {
"title": "lib.lessThan",
"path": ["lib", "lessThan"],
"aliases": [
["builtins", "lessThan"],
["lib", "trivial", "lessThan"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "lessThan",
"args": ["e1", "e2"],
"experimental": false,
"arity": 2
},
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 68,
"column": 23
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"lambda_position": null,
"count_applied": 0,
"content_meta": {
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"path": ["lib", "lessThan"],
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"content": {
"content": "\nReturn `true` if the number *e1* is less than the number *e2*, and\n`false` otherwise. Evaluation aborts if either *e1* or *e2* does not\nevaluate to a number.\n",
"source": {
"position": null,
"path": ["lib", "lessThan"],
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}
},
{
"meta": {
"title": "lib.listDfs",
"path": ["lib", "listDfs"],
"aliases": [["lib", "lists", "listDfs"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
"column": 25
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 860,
"column": 13
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"count_applied": 0,
"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 860,
"column": 3
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"path": ["lib", "lists", "listDfs"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nDepth-First Search (DFS) for lists `list != []`.\n`before a b == true` means that `b` depends on `a` (there's an\nedge from `b` to `a`).\n\n# Example\n\n```nix\nlistDfs true hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" ]\n == { minimal = \"/\"; # minimal element\n visited = [ \"/home/user\" ]; # seen elements (in reverse order)\n rest = [ \"/home\" \"other\" ]; # everything else\n }\nlistDfs true hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" \"/\" ]\n == { cycle = \"/\"; # cycle encountered at this element\n loops = [ \"/\" ]; # and continues to these elements\n visited = [ \"/\" \"/home/user\" ]; # elements leading to the cycle (in reverse order)\n rest = [ \"/home\" \"other\" ]; # everything else\n```\n\n# Arguments\n\n- [stopOnCycles] \n- [before] \n- [list] \n\n",
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{
"meta": {
"title": "lib.listToAttrs",
"path": ["lib", "listToAttrs"],
"aliases": [
["builtins", "listToAttrs"],
["lib", "attrsets", "listToAttrs"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "listToAttrs",
"args": ["e"],
"experimental": false,
"arity": 1
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"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"count_applied": 0,
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"position": null,
"path": ["lib", "listToAttrs"],
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"content": {
"content": "\nConstruct a set from a list specifying the names and values of each\nattribute. Each element of the list should be a set consisting of a\nstring-valued attribute `name` specifying the name of the attribute,\nand an attribute `value` specifying its value.\n\nIn case of duplicate occurrences of the same name, the first\ntakes precedence.\n\nExample:\n\n```nix\nbuiltins.listToAttrs\n [ { name = \"foo\"; value = 123; }\n { name = \"bar\"; value = 456; }\n { name = \"bar\"; value = 420; }\n ]\n```\n\nevaluates to\n\n```nix\n{ foo = 123; bar = 456; }\n```\n",
"source": {
"position": null,
"path": ["lib", "listToAttrs"],
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},
{
"meta": {
"title": "lib.literalExample",
"path": ["lib", "literalExample"],
"aliases": [["lib", "options", "literalExample"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 141,
"column": 27
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"lambda_position": {
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"content": "\nFor use in the `defaultText` and `example` option attributes. Causes the\ngiven string to be rendered verbatim in the documentation as Nix code. This\nis necessary for complex values, e.g. functions, or values that depend on\nother values or packages.\n\n# Arguments\n\n- [text] \n\n",
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{
"meta": {
"title": "lib.literalExpression",
"path": ["lib", "literalExpression"],
"aliases": [["lib", "options", "literalExpression"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 141,
"column": 27
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/options.nix",
"line": 443,
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"path": ["lib", "options", "literalExpression"],
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"content": {
"content": "\nFor use in the `defaultText` and `example` option attributes. Causes the\ngiven string to be rendered verbatim in the documentation as Nix code. This\nis necessary for complex values, e.g. functions, or values that depend on\nother values or packages.\n\n# Arguments\n\n- [text] \n\n",
"source": {
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},
{
"meta": {
"title": "lib.literalMD",
"path": ["lib", "literalMD"],
"aliases": [["lib", "options", "literalMD"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"column": 27
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"lambda_position": {
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"line": 465,
"column": 15
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"content": {
"content": "\nFor use in the `defaultText` and `example` option attributes. Causes the\ngiven MD text to be inserted verbatim in the documentation, for when\na `literalExpression` would be too hard to read.\n\n# Arguments\n\n- [text] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/options.nix",
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"path": ["lib", "options", "literalMD"],
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},
{
"meta": {
"title": "lib.lowPrio",
"path": ["lib", "lowPrio"],
"aliases": [
["lib", "meta", "lowPrio"],
["pkgs", "lowPrio"]
],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 121,
"column": 24
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 27,
"column": 28
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"path": ["lib", "meta", "lowPrio"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nDecrease the nix-env priority of the package, i.e., other\nversions/variants of the package will be preferred.\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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},
{
"meta": {
"title": "lib.lowPrioSet",
"path": ["lib", "lowPrioSet"],
"aliases": [["lib", "meta", "lowPrioSet"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 121,
"column": 24
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"path": ["lib", "meta", "lowPrioSet"],
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"content": {
"content": "\nApply lowPrio to an attrset with derivations\n\n# Arguments\n\n- [set] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"path": ["lib", "meta", "lowPrioSet"],
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},
{
"meta": {
"title": "lib.makeBinPath",
"path": ["lib", "makeBinPath"],
"aliases": [["lib", "strings", "makeBinPath"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": {
"content": "\nConstruct a binary search path (such as $PATH) containing the\nbinaries for a set of packages.\n\n# Example\n\n```nix\nmakeBinPath [\"/root\" \"/usr\" \"/usr/local\"]\n=> \"/root/bin:/usr/bin:/usr/local/bin\"\n```\n",
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"meta": {
"title": "lib.makeExtensible",
"path": ["lib", "makeExtensible"],
"aliases": [["lib", "fixedPoints", "makeExtensible"]],
"signature": null,
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"primop_meta": null,
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"content": "\nCreate an overridable, recursive attribute set. For example:\n```\nnix-repl> obj = makeExtensible (self: { })\nnix-repl> obj\n{ __unfix__ = «lambda»; extend = «lambda»; }\nnix-repl> obj = obj.extend (self: super: { foo = \"foo\"; })\nnix-repl> obj\n{ __unfix__ = «lambda»; extend = «lambda»; foo = \"foo\"; }\nnix-repl> obj = obj.extend (self: super: { foo = super.foo + \" + \"; bar = \"bar\"; foobar = self.foo + self.bar; })\nnix-repl> obj\n{ __unfix__ = «lambda»; bar = \"bar\"; extend = «lambda»; foo = \"foo + \"; foobar = \"foo + bar\"; }\n```\n",
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"title": "lib.makeExtensibleWithCustomName",
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"aliases": [["lib", "fixedPoints", "makeExtensibleWithCustomName"]],
"signature": null,
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"primop_meta": null,
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"content": "\nSame as `makeExtensible` but the name of the extending attribute is\ncustomized.\n\n# Arguments\n\n- [extenderName] \n- [rattrs] \n\n",
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"title": "lib.makeLibraryPath",
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"content": "\nConstruct a library search path (such as RPATH) containing the\nlibraries for a set of packages\n\n# Example\n\n```nix\nmakeLibraryPath [ \"/usr\" \"/usr/local\" ]\n=> \"/usr/lib:/usr/local/lib\"\npkgs = import <nixpkgs> { }\nmakeLibraryPath [ pkgs.openssl pkgs.zlib ]\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r/lib:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/lib\"\n```\n",
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"title": "lib.makeOverridable",
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"signature": "makeOverridable :: (AttrSet -> a) -> AttrSet -> a\n",
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"content": "\n`makeOverridable` takes a function from attribute set to attribute set and\ninjects `override` attribute which can be used to override arguments of\nthe function.\nPlease refer to documentation on [`<pkg>.overrideDerivation`](#sec-pkg-overrideDerivation) to learn about `overrideDerivation` and caveats\nrelated to its use.\n\n# Example\n\n```nix\nnix-repl> x = {a, b}: { result = a + b; }\nnix-repl> y = lib.makeOverridable x { a = 1; b = 2; }\nnix-repl> y\n{ override = «lambda»; overrideDerivation = «lambda»; result = 3; }\nnix-repl> y.override { a = 10; }\n{ override = «lambda»; overrideDerivation = «lambda»; result = 12; }\n```\n\n# Type\n\n```\nmakeOverridable :: (AttrSet -> a) -> AttrSet -> a\n```\n\n# Arguments\n\n- [f] \n\n",
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"signature": "makeScope :: (AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a) -> (AttrSet -> AttrSet) -> AttrSet\n",
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"content": "\nMake a set of packages with a common scope. All packages called\nwith the provided `callPackage` will be evaluated with the same\narguments. Any package in the set may depend on any other. The\n`overrideScope'` function allows subsequent modification of the package\nset in a consistent way, i.e. all packages in the set will be\ncalled with the overridden packages. The package sets may be\nhierarchical: the packages in the set are called with the scope\nprovided by `newScope` and the set provides a `newScope` attribute\nwhich can form the parent scope for later package sets.\n\n# Type\n\n```\nmakeScope :: (AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a) -> (AttrSet -> AttrSet) -> AttrSet\n```\n\n# Arguments\n\n- [newScope] \n- [f] \n\n",
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"meta": {
"title": "lib.makeScopeWithSplicing",
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["lib", "customisation", "makeScopeWithSplicing"],
["pkgs", "makeScopeWithSplicing"]
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"content": "\nbackward compatibility with old uncurried form; deprecated\n\n# Arguments\n\n- [splicePackages] \n- [newScope] \n- [otherSplices] \n- [keep] \n- [extra] \n- [f] \n\n",
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"title": "lib.makeScopeWithSplicing' (Prime)",
"path": ["lib", "makeScopeWithSplicing'"],
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["lib", "customisation", "makeScopeWithSplicing'"],
["pkgs", "makeScopeWithSplicing'"]
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"signature": "makeScopeWithSplicing' ::\n { splicePackages :: Splice -> AttrSet\n , newScope :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n }\n -> { otherSplices :: Splice, keep :: AttrSet -> AttrSet, extra :: AttrSet -> AttrSet }\n -> AttrSet\nSplice ::\n { pkgsBuildBuild :: AttrSet\n , pkgsBuildHost :: AttrSet\n , pkgsBuildTarget :: AttrSet\n , pkgsHostHost :: AttrSet\n , pkgsHostTarget :: AttrSet\n , pkgsTargetTarget :: AttrSet\n }\n",
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"content": {
"content": "\nLike makeScope, but aims to support cross compilation. It's still ugly, but\nhopefully it helps a little bit.\n\n# Type\n\n```\nmakeScopeWithSplicing' ::\n { splicePackages :: Splice -> AttrSet\n , newScope :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n }\n -> { otherSplices :: Splice, keep :: AttrSet -> AttrSet, extra :: AttrSet -> AttrSet }\n -> AttrSet\nSplice ::\n { pkgsBuildBuild :: AttrSet\n , pkgsBuildHost :: AttrSet\n , pkgsBuildTarget :: AttrSet\n , pkgsHostHost :: AttrSet\n , pkgsHostTarget :: AttrSet\n , pkgsTargetTarget :: AttrSet\n }\n```\n\n# Arguments\n\n\n",
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"title": "lib.makeSearchPath",
"path": ["lib", "makeSearchPath"],
"aliases": [["lib", "strings", "makeSearchPath"]],
"signature": "makeSearchPath :: string -> [string] -> string\n",
"is_primop": false,
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"content": "\nConstruct a Unix-style, colon-separated search path consisting of\nthe given `subDir` appended to each of the given paths.\n\n# Example\n\n```nix\nmakeSearchPath \"bin\" [\"/root\" \"/usr\" \"/usr/local\"]\n=> \"/root/bin:/usr/bin:/usr/local/bin\"\nmakeSearchPath \"bin\" [\"\"]\n=> \"/bin\"\n```\n\n# Type\n\n```\nmakeSearchPath :: string -> [string] -> string\n```\n\n# Arguments\n\n- [subDir] Directory name to append\n- [paths] List of base paths\n\n",
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"content": "\nConstruct a Unix-style search path by appending the given\n`subDir` to the specified `output` of each of the packages. If no\noutput by the given name is found, fallback to `.out` and then to\nthe default.\n\n# Example\n\n```nix\nmakeSearchPathOutput \"dev\" \"bin\" [ pkgs.openssl pkgs.zlib ]\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev/bin:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/bin\"\n```\n\n# Type\n\n```\nstring -> string -> [package] -> string\n```\n\n# Arguments\n\n- [output] Package output to use\n- [subDir] Directory name to append\n- [pkgs] List of packages\n\n",
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"title": "lib.mapAttrs",
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"aliases": [
["builtins", "mapAttrs"],
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"content": "\nApply a function to each element in an attribute set, creating a new attribute set.\n\n# Example\n\n```nix\nmapAttrs (name: value: name + \"-\" + value)\n { x = \"foo\"; y = \"bar\"; }\n=> { x = \"x-foo\"; y = \"y-bar\"; }\n```\n\n# Type\n\n```\nmapAttrs :: (String -> Any -> Any) -> AttrSet -> AttrSet\n```\n",
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"content": "\nLike `mapAttrs`, but allows the name of each attribute to be\nchanged in addition to the value. The applied function should\nreturn both the new name and value as a `nameValuePair`.\n\n# Example\n\n```nix\nmapAttrs' (name: value: nameValuePair (\"foo_\" + name) (\"bar-\" + value))\n { x = \"a\"; y = \"b\"; }\n=> { foo_x = \"bar-a\"; foo_y = \"bar-b\"; }\n```\n\n# Type\n\n```\nmapAttrs' :: (String -> Any -> { name :: String; value :: Any; }) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [f] A function, given an attribute's name and value, returns a new `nameValuePair`.\n- [set] Attribute set to map over.\n\n",
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"meta": {
"title": "lib.mapAttrsRecursive",
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"content": "\nLike `mapAttrs`, except that it recursively applies itself to\nthe *leaf* attributes of a potentially-nested attribute set:\nthe second argument of the function will never be an attrset.\nAlso, the first argument of the argument function is a *list*\nof the attribute names that form the path to the leaf attribute.\nFor a function that gives you control over what counts as a leaf,\nsee `mapAttrsRecursiveCond`.\n\n# Example\n\n```nix\nmapAttrsRecursive (path: value: concatStringsSep \"-\" (path ++ [value]))\n { n = { a = \"A\"; m = { b = \"B\"; c = \"C\"; }; }; d = \"D\"; }\n=> { n = { a = \"n-a-A\"; m = { b = \"n-m-b-B\"; c = \"n-m-c-C\"; }; }; d = \"d-D\"; }\n```\n\n# Type\n\n```\nmapAttrsRecursive :: ([String] -> a -> b) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [f] A function, given a list of attribute names and a value, returns a new value.\n- [set] Set to recursively map over.\n\n",
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"meta": {
"title": "lib.mapAttrsRecursiveCond",
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"content": "\nLike `mapAttrsRecursive`, but it takes an additional predicate\nfunction that tells it whether to recurse into an attribute\nset. If it returns false, `mapAttrsRecursiveCond` does not\nrecurse, but does apply the map function. If it returns true, it\ndoes recurse, and does not apply the map function.\n\n# Example\n\n```nix\n# To prevent recursing into derivations (which are attribute\n# sets with the attribute \"type\" equal to \"derivation\"):\nmapAttrsRecursiveCond\n (as: !(as ? \"type\" && as.type == \"derivation\"))\n (x: ... do something ...)\n attrs\n```\n\n# Type\n\n```\nmapAttrsRecursiveCond :: (AttrSet -> Bool) -> ([String] -> a -> b) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [cond] A function, given the attribute set the recursion is currently at, determine if to recurse deeper into that attribute set.\n- [f] A function, given a list of attribute names and a value, returns a new value.\n- [set] Attribute set to recursively map over.\n\n",
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"content": "\n\"Merge\" option definitions by checking that they all have the same value.\n\n# Arguments\n\n- [loc] \n- [defs] \n\n",
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"content": "\nMerge a list of modules. This will recurse over the option\ndeclarations in all modules, combining them into a single set.\nAt the same time, for each option declaration, it will merge the\ncorresponding option definitions in all machines, returning them\nin the ‘value’ attribute of each option.\nThis returns a set like\n{\n# A recursive set of options along with their final values\nmatchedOptions = {\nfoo = { _type = \"option\"; value = \"option value of foo\"; ... };\nbar.baz = { _type = \"option\"; value = \"option value of bar.baz\"; ... };\n...\n};\n# A list of definitions that weren't matched by any option\nunmatchedDefns = [\n{ file = \"file.nix\"; prefix = [ \"qux\" ]; value = \"qux\"; }\n...\n];\n}\n\n# Arguments\n\n- [prefix] \n- [modules] \n\n",
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"content": "\nMerge multiple option declarations into a single declaration. In\ngeneral, there should be only one declaration of each option.\nThe exception is the ‘options’ attribute, which specifies\nsub-options. These can be specified multiple times to allow one\nmodule to add sub-options to an option declared somewhere else\n(e.g. multiple modules define sub-options for ‘fileSystems’).\n'loc' is the list of attribute names where the option is located.\n'opts' is a list of modules. Each module has an options attribute which\ncorrespond to the definition of 'loc' in 'opt.file'.\n\n# Arguments\n\n- [loc] \n- [opts] \n\n",
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"content": "\nCreate a -D<condition>={true,false} string that can be passed to typical\nMeson invocations.\n\n# Example\n\n```nix\nmesonBool \"hardened\" true\n=> \"-Dhardened=true\"\nmesonBool \"static\" false\n=> \"-Dstatic=false\"\n```\n\n# Type\n\n```\nmesonBool :: string -> bool -> string\n @param condition The condition to be made true or false\n @param flag The controlling flag of the condition\n```\n\n# Arguments\n\n- [condition] \n- [flag] \n\n",
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"content": "\nCreate a -D<feature>={enabled,disabled} string that can be passed to\ntypical Meson invocations.\n\n# Example\n\n```nix\nmesonEnable \"docs\" true\n=> \"-Ddocs=enabled\"\nmesonEnable \"savage\" false\n=> \"-Dsavage=disabled\"\n```\n\n# Type\n\n```\nmesonEnable :: string -> bool -> string\n @param feature The feature to be enabled or disabled\n @param flag The controlling flag\n```\n\n# Arguments\n\n- [feature] \n- [flag] \n\n",
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"content": "\nCreate a -D<feature>=<value> string that can be passed to typical Meson\ninvocations.\n\n# Example\n\n```nix\nmesonOption \"engine\" \"opengl\"\n=> \"-Dengine=opengl\"\n```\n\n# Type\n\n```\nmesonOption :: string -> string -> string\n @param feature The feature to be set\n @param value The desired value\n```\n\n# Arguments\n\n- [feature] \n- [value] \n\n",
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"content": "\nReturn minimum of two numbers.\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"content": "\n`mirrorFunctionArgs f g` creates a new function `g'` with the same behavior as `g` (`g' x == g x`)\nbut its function arguments mirroring `f` (`lib.functionArgs g' == lib.functionArgs f`).\n\n# Example\n\n```nix\naddab = {a, b}: a + b\naddab { a = 2; b = 4; }\n=> 6\nlib.functionArgs addab\n=> { a = false; b = false; }\naddab1 = attrs: addab attrs + 1\naddab1 { a = 2; b = 4; }\n=> 7\nlib.functionArgs addab1\n=> { }\naddab1' = lib.mirrorFunctionArgs addab addab1\naddab1' { a = 2; b = 4; }\n=> 7\nlib.functionArgs addab1'\n=> { a = false; b = false; }\n```\n\n# Type\n\n```\nmirrorFunctionArgs :: (a -> b) -> (a -> c) -> (a -> c)\n```\n\n# Arguments\n\n- [f] Function to provide the argument metadata\n\n",
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"content": "\nSingle \"from\" version of mkMergedOptionModule.\nReturn a module that causes a warning to be shown if the \"from\" option is\ndefined; the defined value can be used in the \"mergeFn\" to set the \"to\"\nvalue.\nThis function can be used to change an option into another that has a\ndifferent type.\n\"mergeFn\" takes the module \"config\" as a parameter and must return a value of\n\"to\" option type.\nmkChangedOptionModule [ \"a\" \"b\" \"c\" ] [ \"x\" \"y\" \"z\" ]\n(config:\nlet value = getAttrFromPath [ \"a\" \"b\" \"c\" ] config;\nin\nif value > 100 then \"high\"\nelse \"normal\")\n- options.a.b.c is a removed int option\n- options.x.y.z is a new str option that supersedes a.b.c\nThis show a warning if a.b.c is set, and set the value of x.y.z to the\nresult of the change function\n\n# Arguments\n\n- [from] \n- [to] \n- [changeFn] \n\n",
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"content": "\nmkDerivedConfig : Option a -> (a -> Definition b) -> Definition b\nCreate config definitions with the same priority as the definition of another option.\nThis should be used for option definitions where one option sets the value of another as a convenience.\nFor instance a config file could be set with a `text` or `source` option, where text translates to a `source`\nvalue using `mkDerivedConfig options.text (pkgs.writeText \"filename.conf\")`.\nIt takes care of setting the right priority using `mkOverride`.\n\n# Arguments\n\n- [opt] \n- [f] \n\n",
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"content": "\nThe identity function\nFor when you need a function that does “nothing”.\n\n# Type\n\n```\nid :: a -> a\n```\n\n# Arguments\n\n- [x] The value to return\n\n",
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"content": "\nProperties.\n\n# Arguments\n\n- [condition] \n- [content] \n\n",
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"content": "\nReturn a module that causes a warning to be shown if any of the \"from\"\noption is defined; the defined values can be used in the \"mergeFn\" to set\nthe \"to\" value.\nThis function can be used to merge multiple options into one that has a\ndifferent type.\n\"mergeFn\" takes the module \"config\" as a parameter and must return a value\nof \"to\" option type.\nmkMergedOptionModule\n[ [ \"a\" \"b\" \"c\" ]\n[ \"d\" \"e\" \"f\" ] ]\n[ \"x\" \"y\" \"z\" ]\n(config:\nlet value = p: getAttrFromPath p config;\nin\nif (value [ \"a\" \"b\" \"c\" ]) == true then \"foo\"\nelse if (value [ \"d\" \"e\" \"f\" ]) == true then \"bar\"\nelse \"baz\")\n- options.a.b.c is a removed boolean option\n- options.d.e.f is a removed boolean option\n- options.x.y.z is a new str option that combines a.b.c and d.e.f\nfunctionality\nThis show a warning if any a.b.c or d.e.f is set, and set the value of\nx.y.z to the result of the merge function\n\n# Arguments\n\n- [from] \n- [to] \n- [mergeFn] \n\n",
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"content": "\nCreates an Option attribute set for an option that specifies the\npackage a module should use for some purpose.\nThe package is specified in the third argument under `default` as a list of strings\nrepresenting its attribute path in nixpkgs (or another package set).\nBecause of this, you need to pass nixpkgs itself (usually `pkgs` in a module;\nalternatively to nixpkgs itself, another package set) as the first argument.\nIf you pass another package set you should set the `pkgsText` option.\nThis option is used to display the expression for the package set. It is `\"pkgs\"` by default.\nIf your expression is complex you should parenthesize it, as the `pkgsText` argument\nis usually immediately followed by an attribute lookup (`.`).\nThe second argument may be either a string or a list of strings.\nIt provides the display name of the package in the description of the generated option\n(using only the last element if the passed value is a list)\nand serves as the fallback value for the `default` argument.\nTo include extra information in the description, pass `extraDescription` to\nappend arbitrary text to the generated description.\nYou can also pass an `example` value, either a literal string or an attribute path.\nThe `default` argument can be omitted if the provided name is\nan attribute of pkgs (if `name` is a string) or a valid attribute path in pkgs (if `name` is a list).\nYou can also set `default` to just a string in which case it is interpreted as an attribute name\n(a singleton attribute path, if you will).\nIf you wish to explicitly provide no default, pass `null` as `default`.\nIf you want users to be able to set no package, pass `nullable = true`.\nIn this mode a `default = null` will not be interpreted as no default and is interpreted literally.\n\n# Example\n\n```nix\nmkPackageOption pkgs \"hello\" { }\n=> { ...; default = pkgs.hello; defaultText = literalExpression \"pkgs.hello\"; description = \"The hello package to use.\"; type = package; }\nmkPackageOption pkgs \"GHC\" {\n default = [ \"ghc\" ];\n example = \"pkgs.haskell.packages.ghc92.ghc.withPackages (hkgs: [ hkgs.primes ])\";\n}\n=> { ...; default = pkgs.ghc; defaultText = literalExpression \"pkgs.ghc\"; description = \"The GHC package to use.\"; example = literalExpression \"pkgs.haskell.packages.ghc92.ghc.withPackages (hkgs: [ hkgs.primes ])\"; type = package; }\nmkPackageOption pkgs [ \"python3Packages\" \"pytorch\" ] {\n extraDescription = \"This is an example and doesn't actually do anything.\";\n}\n=> { ...; default = pkgs.python3Packages.pytorch; defaultText = literalExpression \"pkgs.python3Packages.pytorch\"; description = \"The pytorch package to use. This is an example and doesn't actually do anything.\"; type = package; }\nmkPackageOption pkgs \"nushell\" {\n nullable = true;\n}\n=> { ...; default = pkgs.nushell; defaultText = literalExpression \"pkgs.nushell\"; description = \"The nushell package to use.\"; type = nullOr package; }\nmkPackageOption pkgs \"coreutils\" {\n default = null;\n}\n=> { ...; description = \"The coreutils package to use.\"; type = package; }\nmkPackageOption pkgs \"dbus\" {\n nullable = true;\n default = null;\n}\n=> { ...; default = null; description = \"The dbus package to use.\"; type = nullOr package; }\nmkPackageOption pkgs.javaPackages \"OpenJFX\" {\n default = \"openjfx20\";\n pkgsText = \"pkgs.javaPackages\";\n}\n=> { ...; default = pkgs.javaPackages.openjfx20; defaultText = literalExpression \"pkgs.javaPackages.openjfx20\"; description = \"The OpenJFX package to use.\"; type = package; }\n```\n\n# Type\n\n```\nmkPackageOption :: pkgs -> (string|[string]) -> { nullable? :: bool, default? :: string|[string], example? :: null|string|[string], extraDescription? :: string, pkgsText? :: string } -> option\n```\n\n# Arguments\n\n- [pkgs] Package set (an instantiation of nixpkgs such as pkgs in modules or another package set)\n- [name] Name for the package, shown in option description\n\n",
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"content": "\nAlias of mkPackageOption. Previously used to create options with markdown\ndocumentation, which is no longer required.\n",
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"content": "\nReturn a module that causes a warning to be shown if the\nspecified option is defined. For example,\nmkRemovedOptionModule [ \"boot\" \"loader\" \"grub\" \"bootDevice\" ] \"<replacement instructions>\"\ncauses a assertion if the user defines boot.loader.grub.bootDevice.\nreplacementInstructions is a string that provides instructions on\nhow to achieve the same functionality without the removed option,\nor alternatively a reasoning why the functionality is not needed.\nreplacementInstructions SHOULD be provided!\n\n# Arguments\n\n- [optionName] \n- [replacementInstructions] \n\n",
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"content": "\nReturn a module that causes a warning to be shown if the\nspecified \"from\" option is defined; the defined value is however\nforwarded to the \"to\" option. This can be used to rename options\nwhile providing backward compatibility. For example,\nmkRenamedOptionModule [ \"boot\" \"copyKernels\" ] [ \"boot\" \"loader\" \"grub\" \"copyKernels\" ]\nforwards any definitions of boot.copyKernels to\nboot.loader.grub.copyKernels while printing a warning.\nThis also copies over the priority from the aliased option to the\nnon-aliased option.\n\n# Arguments\n\n- [from] \n- [to] \n\n",
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"title": "lib.mkSinkUndeclaredOptions",
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"content": "\nThis option accepts anything, but it does not produce any result.\nThis is useful for sharing a module across different module sets\nwithout having to implement similar features as long as the\nvalues of the options are not accessed.\n\n# Arguments\n\n- [attrs] \n\n",
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"title": "lib.mkVMOverride",
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"title": "lib.mod",
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"content": "\nInteger modulus\n\n# Example\n\n```nix\nmod 11 10\n=> 1\nmod 1 10\n=> 1\n```\n\n# Arguments\n\n- [base] \n- [int] \n\n",
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"meta": {
"title": "lib.mutuallyExclusive",
"path": ["lib", "mutuallyExclusive"],
"aliases": [["lib", "lists", "mutuallyExclusive"]],
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"content": {
"content": "\nTest if two lists have no common element.\nIt should be slightly more efficient than (intersectLists a b == [])\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"title": "lib.nameFromURL",
"path": ["lib", "nameFromURL"],
"aliases": [["lib", "strings", "nameFromURL"]],
"signature": null,
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"content": "\nExtract name with version from URL. Ask for separator which is\nsupposed to start extension.\n\n# Example\n\n```nix\nnameFromURL \"https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2\" \"-\"\n=> \"nix\"\nnameFromURL \"https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2\" \"_\"\n=> \"nix-1.7-x86\"\n```\n\n# Arguments\n\n- [url] \n- [sep] \n\n",
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"title": "lib.nameValuePair",
"path": ["lib", "nameValuePair"],
"aliases": [["lib", "attrsets", "nameValuePair"]],
"signature": "nameValuePair :: String -> Any -> { name :: String; value :: Any; }\n",
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"content": "\nUtility function that creates a `{name, value}` pair as expected by `builtins.listToAttrs`.\n\n# Example\n\n```nix\nnameValuePair \"some\" 6\n=> { name = \"some\"; value = 6; }\n```\n\n# Type\n\n```\nnameValuePair :: String -> Any -> { name :: String; value :: Any; }\n```\n\n# Arguments\n\n- [name] Attribute name\n- [value] Attribute value\n\n",
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"title": "lib.naturalSort",
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"content": "\nSort list using \"Natural sorting\".\nNumeric portions of strings are sorted in numeric order.\n\n# Example\n\n```nix\nnaturalSort [\"disk11\" \"disk8\" \"disk100\" \"disk9\"]\n=> [\"disk8\" \"disk9\" \"disk11\" \"disk100\"]\nnaturalSort [\"10.46.133.149\" \"10.5.16.62\" \"10.54.16.25\"]\n=> [\"10.5.16.62\" \"10.46.133.149\" \"10.54.16.25\"]\nnaturalSort [\"v0.2\" \"v0.15\" \"v0.0.9\"]\n=> [ \"v0.0.9\" \"v0.2\" \"v0.15\" ]\n```\n\n# Arguments\n\n- [lst] \n\n",
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"content": "\nIf `cond` is true, return the attribute set `as`,\notherwise an empty attribute set.\n\n# Example\n\n```nix\noptionalAttrs (true) { my = \"set\"; }\n=> { my = \"set\"; }\noptionalAttrs (false) { my = \"set\"; }\n=> { }\n```\n\n# Type\n\n```\noptionalAttrs :: Bool -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [cond] Condition under which the `as` attribute set is returned.\n- [as] The attribute set to return if `cond` is `true`.\n\n",
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"content": "\nReturn a list or an empty list, depending on a boolean value.\n\n# Example\n\n```nix\noptionals true [ 2 3 ]\n=> [ 2 3 ]\noptionals false [ 2 3 ]\n=> [ ]\n```\n\n# Type\n\n```\noptionals :: bool -> [a] -> [a]\n```\n\n# Arguments\n\n- [cond] Condition\n- [elems] List to return if condition is true\n\n",
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"content": "\nboolean “or”\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"content": "\n`overrideDerivation drv f` takes a derivation (i.e., the result\nof a call to the builtin function `derivation`) and returns a new\nderivation in which the attributes of the original are overridden\naccording to the function `f`. The function `f` is called with\nthe original derivation attributes.\n`overrideDerivation` allows certain \"ad-hoc\" customisation\nscenarios (e.g. in ~/.config/nixpkgs/config.nix). For instance,\nif you want to \"patch\" the derivation returned by a package\nfunction in Nixpkgs to build another version than what the\nfunction itself provides.\nFor another application, see build-support/vm, where this\nfunction is used to build arbitrary derivations inside a QEMU\nvirtual machine.\nNote that in order to preserve evaluation errors, the new derivation's\noutPath depends on the old one's, which means that this function cannot\nbe used in circular situations when the old derivation also depends on the\nnew one.\nYou should in general prefer `drv.overrideAttrs` over this function;\nsee the nixpkgs manual for more information on overriding.\n\n# Example\n\n```nix\nmySed = overrideDerivation pkgs.gnused (oldAttrs: {\n name = \"sed-4.2.2-pre\";\n src = fetchurl {\n url = ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2;\n hash = \"sha256-MxBJRcM2rYzQYwJ5XKxhXTQByvSg5jZc5cSHEZoB2IY=\";\n };\n patches = [];\n});\n```\n\n# Type\n\n```\noverrideDerivation :: Derivation -> ( Derivation -> AttrSet ) -> Derivation\n```\n\n# Arguments\n\n- [drv] \n- [f] \n\n",
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"content": "\nOverride only the attributes that are already present in the old set\nuseful for deep-overriding.\n\n# Example\n\n```nix\noverrideExisting {} { a = 1; }\n=> {}\noverrideExisting { b = 2; } { a = 1; }\n=> { b = 2; }\noverrideExisting { a = 3; b = 2; } { a = 1; }\n=> { a = 1; b = 2; }\n```\n\n# Type\n\n```\noverrideExisting :: AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [old] Original attribute set\n- [new] Attribute set with attributes to override in `old`.\n\n",
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"path": ["lib", "filesystem", "pathIsDirectory"],
"pos_type": "Attribute"
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"content": {
"content": "\nWhether a path exists and is a directory.\n\n# Example\n\n```nix\npathIsDirectory /.\n=> true\npathIsDirectory /this/does/not/exist\n=> false\npathIsDirectory /some/file.nix\n=> false\n```\n\n# Type\n\n```\npathIsDirectory :: Path -> Bool\n```\n\n# Arguments\n\n- [path] \n\n",
"source": {
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"line": 79,
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"path": ["lib", "filesystem", "pathIsDirectory"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.pathIsGitRepo",
"path": ["lib", "pathIsGitRepo"],
"aliases": [["lib", "sources", "pathIsGitRepo"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"content": null,
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"path": ["lib", "pathIsGitRepo"],
"pos_type": "Lambda"
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},
{
"meta": {
"title": "lib.pathIsRegularFile",
"path": ["lib", "pathIsRegularFile"],
"aliases": [
["lib", "filesystem", "pathIsRegularFile"],
["lib", "sources", "pathIsRegularFile"]
],
"signature": "pathIsRegularFile :: Path -> Bool\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "filesystem", "pathIsRegularFile"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nWhether a path exists and is a regular file, meaning not a symlink or any other special file type.\n\n# Example\n\n```nix\npathIsRegularFile /.\n=> false\npathIsRegularFile /this/does/not/exist\n=> false\npathIsRegularFile /some/file.nix\n=> true\n```\n\n# Type\n\n```\npathIsRegularFile :: Path -> Bool\n```\n\n# Arguments\n\n- [path] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/filesystem.nix",
"line": 107,
"column": 3
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"path": ["lib", "filesystem", "pathIsRegularFile"],
"pos_type": "Attribute"
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}
},
{
"meta": {
"title": "lib.pathType",
"path": ["lib", "pathType"],
"aliases": [
["builtins", "readFileType"],
["lib", "filesystem", "pathType"],
["lib", "sources", "pathType"]
],
"signature": "pathType :: Path -> String\n",
"is_primop": true,
"primop_meta": {
"name": "readFileType",
"args": ["p"],
"experimental": false,
"arity": 1
},
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"line": 38,
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"path": ["lib", "filesystem", "pathType"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nThe type of a path. The path needs to exist and be accessible.\nThe result is either \"directory\" for a directory, \"regular\" for a regular file, \"symlink\" for a symlink, or \"unknown\" for anything else.\n\n# Example\n\n```nix\npathType /.\n=> \"directory\"\npathType /some/file.nix\n=> \"regular\"\n```\n\n# Type\n\n```\npathType :: Path -> String\n```\n",
"source": {
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"path": ["lib", "filesystem", "pathType"],
"pos_type": "Attribute"
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}
},
{
"meta": {
"title": "lib.pipe",
"path": ["lib", "pipe"],
"aliases": [["lib", "trivial", "pipe"]],
"signature": "pipe :: a -> [<functions>] -> <return type of last function>\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 73,
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/trivial.nix",
"line": 94,
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"path": ["lib", "trivial", "pipe"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nPipes a value through a list of functions, left to right.\n\n# Example\n\n```nix\npipe 2 [\n (x: x + 2) # 2 + 2 = 4\n (x: x * 2) # 4 * 2 = 8\n ]\n => 8\n # ideal to do text transformations\n pipe [ \"a/b\" \"a/c\" ] [\n # create the cp command\n (map (file: ''cp \"${src}/${file}\" $out\\n''))\n # concatenate all commands into one string\n lib.concatStrings\n # make that string into a nix derivation\n (pkgs.runCommand \"copy-to-out\" {})\n ]\n => <drv which copies all files to $out>\nThe output type of each function has to be the input type\nof the next function, and the last function returns the\nfinal value.\n```\n\n# Type\n\n```\npipe :: a -> [<functions>] -> <return type of last function>\n```\n\n# Arguments\n\n- [val] \n- [functions] \n\n",
"source": {
"position": {
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"line": 94,
"column": 3
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"path": ["lib", "trivial", "pipe"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.pushDownProperties",
"path": ["lib", "pushDownProperties"],
"aliases": [["lib", "modules", "pushDownProperties"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 129,
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/modules.nix",
"line": 918,
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"path": ["lib", "pushDownProperties"],
"pos_type": "Lambda"
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"content": {
"content": "\nGiven a config set, expand mkMerge properties, and push down the\nother properties into the children. The result is a list of\nconfig sets that do not have properties at top-level. For\nexample,\nmkMerge [ { boot = set1; } (mkIf cond { boot = set2; services = set3; }) ]\nis transformed into\n[ { boot = set1; } { boot = mkIf cond set2; services = mkIf cond set3; } ].\nThis transform is the critical step that allows mkIf conditions\nto refer to the full configuration without creating an infinite\nrecursion.\n\n# Arguments\n\n- [cfg] \n\n",
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"path": ["lib", "pushDownProperties"],
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},
{
"meta": {
"title": "lib.range",
"path": ["lib", "range"],
"aliases": [["lib", "lists", "range"]],
"signature": "range :: int -> int -> [int]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "lists", "range"],
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"content": {
"content": "\nReturn a list of integers from `first` up to and including `last`.\n\n# Example\n\n```nix\nrange 2 4\n=> [ 2 3 4 ]\nrange 3 2\n=> [ ]\n```\n\n# Type\n\n```\nrange :: int -> int -> [int]\n```\n\n# Arguments\n\n- [first] First integer in the range\n- [last] Last integer in the range\n\n",
"source": {
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"path": ["lib", "lists", "range"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.readFile",
"path": ["lib", "readFile"],
"aliases": [
["builtins", "readFile"],
["lib", "strings", "readFile"],
["lib", "trivial", "readFile"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "readFile",
"args": ["path"],
"experimental": false,
"arity": 1
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"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": null,
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"content_meta": {
"position": null,
"path": ["lib", "readFile"],
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},
"content": {
"content": "\nReturn the contents of the file *path* as a string.\n",
"source": {
"position": null,
"path": ["lib", "readFile"],
"pos_type": "Lambda"
}
}
},
{
"meta": {
"title": "lib.readPathsFromFile",
"path": ["lib", "readPathsFromFile"],
"aliases": [["lib", "strings", "readPathsFromFile"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
"line": 1830,
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"line": 1829,
"column": 3
},
"path": ["lib", "strings", "readPathsFromFile"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nRead a list of paths from `file`, relative to the `rootPath`.\nLines beginning with `#` are treated as comments and ignored.\nWhitespace is significant.\nNOTE: This function is not performant and should be avoided.\n\n# Example\n\n```nix\nreadPathsFromFile /prefix\n ./pkgs/development/libraries/qt-5/5.4/qtbase/series\n=> [ \"/prefix/dlopen-resolv.patch\" \"/prefix/tzdir.patch\"\n \"/prefix/dlopen-libXcursor.patch\" \"/prefix/dlopen-openssl.patch\"\n \"/prefix/dlopen-dbus.patch\" \"/prefix/xdg-config-dirs.patch\"\n \"/prefix/nix-profiles-library-paths.patch\"\n \"/prefix/compose-search-path.patch\" ]\n```\n",
"source": {
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"path": ["lib", "strings", "readPathsFromFile"],
"pos_type": "Attribute"
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}
},
{
"meta": {
"title": "lib.recurseIntoAttrs",
"path": ["lib", "recurseIntoAttrs"],
"aliases": [
["lib", "attrsets", "recurseIntoAttrs"],
["pkgs", "recurseIntoAttrs"]
],
"signature": "recurseIntoAttrs :: AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
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"line": 1510,
"column": 3
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"path": ["lib", "attrsets", "recurseIntoAttrs"],
"pos_type": "Attribute"
}
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"content": {
"content": "\nMake various Nix tools consider the contents of the resulting\nattribute set when looking for what to build, find, etc.\nThis function only affects a single attribute set; it does not\napply itself recursively for nested attribute sets.\n\n# Example\n\n```nix\n{ pkgs ? import <nixpkgs> {} }:\n{\n myTools = pkgs.lib.recurseIntoAttrs {\n inherit (pkgs) hello figlet;\n };\n}\n```\n\n# Type\n\n```\nrecurseIntoAttrs :: AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [attrs] An attribute set to scan for derivations.\n\n",
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"path": ["lib", "attrsets", "recurseIntoAttrs"],
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},
{
"meta": {
"title": "lib.recursiveUpdate",
"path": ["lib", "recursiveUpdate"],
"aliases": [["lib", "attrsets", "recursiveUpdate"]],
"signature": "recursiveUpdate :: AttrSet -> AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
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"line": 1244,
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"path": ["lib", "attrsets", "recursiveUpdate"],
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"content": {
"content": "\nA recursive variant of the update operator ‘//’. The recursion\nstops when one of the attribute values is not an attribute set,\nin which case the right hand side value takes precedence over the\nleft hand side value.\n\n# Example\n\n```nix\nrecursiveUpdate {\n boot.loader.grub.enable = true;\n boot.loader.grub.device = \"/dev/hda\";\n} {\n boot.loader.grub.device = \"\";\n}\nreturns: {\n boot.loader.grub.enable = true;\n boot.loader.grub.device = \"\";\n}\n```\n\n# Type\n\n```\nrecursiveUpdate :: AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [lhs] Left attribute set of the merge.\n- [rhs] Right attribute set of the merge.\n\n",
"source": {
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"path": ["lib", "attrsets", "recursiveUpdate"],
"pos_type": "Attribute"
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}
},
{
"meta": {
"title": "lib.recursiveUpdateUntil",
"path": ["lib", "recursiveUpdateUntil"],
"aliases": [["lib", "attrsets", "recursiveUpdateUntil"]],
"signature": "recursiveUpdateUntil :: ( [ String ] -> AttrSet -> AttrSet -> Bool ) -> AttrSet -> AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
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"path": ["lib", "attrsets", "recursiveUpdateUntil"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nDoes the same as the update operator '//' except that attributes are\nmerged until the given predicate is verified. The predicate should\naccept 3 arguments which are the path to reach the attribute, a part of\nthe first attribute set and a part of the second attribute set. When\nthe predicate is satisfied, the value of the first attribute set is\nreplaced by the value of the second attribute set.\n\n# Example\n\n```nix\nrecursiveUpdateUntil (path: l: r: path == [\"foo\"]) {\n # first attribute set\n foo.bar = 1;\n foo.baz = 2;\n bar = 3;\n} {\n #second attribute set\n foo.bar = 1;\n foo.quz = 2;\n baz = 4;\n}\n=> {\n foo.bar = 1; # 'foo.*' from the second set\n foo.quz = 2; #\n bar = 3; # 'bar' from the first set\n baz = 4; # 'baz' from the second set\n}\n```\n\n# Type\n\n```\nrecursiveUpdateUntil :: ( [ String ] -> AttrSet -> AttrSet -> Bool ) -> AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [pred] Predicate, taking the path to the current attribute as a list of strings for attribute names, and the two values at that path from the original arguments.\n- [lhs] Left attribute set of the merge.\n- [rhs] Right attribute set of the merge.\n\n",
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"path": ["lib", "attrsets", "recursiveUpdateUntil"],
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}
},
{
"meta": {
"title": "lib.remove",
"path": ["lib", "remove"],
"aliases": [["lib", "lists", "remove"]],
"signature": "remove :: a -> [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"path": ["lib", "lists", "remove"],
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"content": {
"content": "\nRemove elements equal to 'e' from a list. Useful for buildInputs.\n\n# Example\n\n```nix\nremove 3 [ 1 3 4 3 ]\n=> [ 1 4 ]\n```\n\n# Type\n\n```\nremove :: a -> [a] -> [a]\n```\n\n# Arguments\n\n- [e] Element to remove from the list\n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
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},
{
"meta": {
"title": "lib.removePrefix",
"path": ["lib", "removePrefix"],
"aliases": [
["lib", "lists", "removePrefix"],
["lib", "path", "removePrefix"],
["lib", "strings", "removePrefix"]
],
"signature": "removePrefix :: [a] -> [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "lists", "removePrefix"],
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"content": {
"content": "\nRemove the first list as a prefix from the second list.\nError if the first list isn't a prefix of the second list.\n\n# Example\n\n```nix\nremovePrefix [ 1 2 ] [ 1 2 3 4 ]\n=> [ 3 4 ]\nremovePrefix [ 0 1 ] [ 1 2 3 4 ]\n=> <error>\n```\n\n# Type\n\n```\nremovePrefix :: [a] -> [a] -> [a]\n```\n\n# Arguments\n\n- [list1] \n- [list2] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 1126,
"column": 3
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"path": ["lib", "lists", "removePrefix"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.removeSuffix",
"path": ["lib", "removeSuffix"],
"aliases": [["lib", "strings", "removeSuffix"]],
"signature": "string -> string -> string\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": {
"content": "\nReturn a string without the specified suffix, if the suffix matches.\n\n# Example\n\n```nix\nremoveSuffix \"front\" \"homefront\"\n=> \"home\"\nremoveSuffix \"xxx\" \"homefront\"\n=> \"homefront\"\n```\n\n# Type\n\n```\nstring -> string -> string\n```\n\n# Arguments\n\n- [suffix] Suffix to remove if it matches\n- [str] Input string\n\n",
"source": {
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{
"meta": {
"title": "lib.replaceChars",
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"aliases": [
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["lib", "strings", "replaceStrings"]
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"signature": null,
"is_primop": true,
"primop_meta": {
"name": "replaceStrings",
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"experimental": false,
"arity": 3
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": "\nGiven string *s*, replace every occurrence of the strings in *from*\nwith the corresponding string in *to*.\n\nThe argument *to* is lazy, that is, it is only evaluated when its corresponding pattern in *from* is matched in the string *s*\n\nExample:\n\n```nix\nbuiltins.replaceStrings [\"oo\" \"a\"] [\"a\" \"i\"] \"foobar\"\n```\n\nevaluates to `\"fabir\"`.\n",
"source": {
"position": null,
"path": ["lib", "replaceChars"],
"pos_type": "Lambda"
}
}
},
{
"meta": {
"title": "lib.replaceStrings",
"path": ["lib", "replaceStrings"],
"aliases": [
["builtins", "replaceStrings"],
["lib", "replaceChars"],
["lib", "strings", "replaceChars"],
["lib", "strings", "replaceStrings"]
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"signature": null,
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"primop_meta": {
"name": "replaceStrings",
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": "\nGiven string *s*, replace every occurrence of the strings in *from*\nwith the corresponding string in *to*.\n\nThe argument *to* is lazy, that is, it is only evaluated when its corresponding pattern in *from* is matched in the string *s*\n\nExample:\n\n```nix\nbuiltins.replaceStrings [\"oo\" \"a\"] [\"a\" \"i\"] \"foobar\"\n```\n\nevaluates to `\"fabir\"`.\n",
"source": {
"position": null,
"path": ["lib", "replaceStrings"],
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}
},
{
"meta": {
"title": "lib.replicate",
"path": ["lib", "replicate"],
"aliases": [
["lib", "lists", "replicate"],
["lib", "strings", "replicate"]
],
"signature": "replicate :: int -> a -> [a]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
"column": 25
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 687,
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"path": ["lib", "lists", "replicate"],
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"content": {
"content": "\nReturn a list with `n` copies of an element.\n\n# Example\n\n```nix\nreplicate 3 \"a\"\n=> [ \"a\" \"a\" \"a\" ]\nreplicate 2 true\n=> [ true true ]\n```\n\n# Type\n\n```\nreplicate :: int -> a -> [a]\n```\n\n# Arguments\n\n- [n] \n- [elem] \n\n",
"source": {
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"path": ["lib", "lists", "replicate"],
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}
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},
{
"meta": {
"title": "lib.reverseList",
"path": ["lib", "reverseList"],
"aliases": [["lib", "lists", "reverseList"]],
"signature": "reverseList :: [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
"column": 25
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 830,
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"path": ["lib", "lists", "reverseList"],
"pos_type": "Attribute"
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"content": {
"content": "\nReverse the order of the elements of a list.\n\n# Example\n\n```nix\nreverseList [ \"b\" \"o\" \"j\" ]\n=> [ \"j\" \"o\" \"b\" ]\n```\n\n# Type\n\n```\nreverseList :: [a] -> [a]\n```\n\n# Arguments\n\n- [xs] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
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"path": ["lib", "lists", "reverseList"],
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},
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"meta": {
"title": "lib.runTests",
"path": ["lib", "runTests"],
"aliases": [["lib", "debug", "runTests"]],
"signature": "runTests :: {\n tests = [ String ];\n ${testName} :: {\n expr :: a;\n expected :: a;\n };\n}\n->\n[\n {\n name :: String;\n expected :: a;\n result :: a;\n }\n]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/debug.nix",
"line": 333,
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"path": ["lib", "debug", "runTests"],
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},
"content": {
"content": "\nEvaluates a set of tests.\nA test is an attribute set `{expr, expected}`,\ndenoting an expression and its expected result.\nThe result is a `list` of __failed tests__, each represented as\n`{name, expected, result}`,\n- expected\n- What was passed as `expected`\n- result\n- The actual `result` of the test\nUsed for regression testing of the functions in lib; see\ntests.nix for more examples.\nImportant: Only attributes that start with `test` are executed.\n- If you want to run only a subset of the tests add the attribute `tests = [\"testName\"];`\n\n# Example\n\n```nix\nrunTests {\n testAndOk = {\n expr = lib.and true false;\n expected = false;\n };\n testAndFail = {\n expr = lib.and true false;\n expected = true;\n };\n}\n->\n[\n {\n name = \"testAndFail\";\n expected = true;\n result = false;\n }\n]\n```\n\n# Type\n\n```\nrunTests :: {\n tests = [ String ];\n ${testName} :: {\n expr :: a;\n expected :: a;\n };\n}\n->\n[\n {\n name :: String;\n expected :: a;\n result :: a;\n }\n]\n```\n\n# Arguments\n\n- [tests] Tests to run\n\n",
"source": {
"position": {
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"line": 331,
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"path": ["lib", "debug", "runTests"],
"pos_type": "Attribute"
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}
},
{
"meta": {
"title": "lib.scrubOptionValue",
"path": ["lib", "scrubOptionValue"],
"aliases": [["lib", "options", "scrubOptionValue"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 141,
"column": 27
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/options.nix",
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"line": 407,
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"path": ["lib", "options", "scrubOptionValue"],
"pos_type": "Attribute"
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"content": {
"content": "\nThis function recursively removes all derivation attributes from\n`x` except for the `name` attribute.\nThis is to make the generation of `options.xml` much more\nefficient: the XML representation of derivations is very large\n(on the order of megabytes) and is not actually used by the\nmanual generator.\nThis function was made obsolete by renderOptionValue and is kept for\ncompatibility with out-of-tree code.\n\n# Arguments\n\n- [x] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/options.nix",
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"path": ["lib", "options", "scrubOptionValue"],
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},
{
"meta": {
"title": "lib.seq",
"path": ["lib", "seq"],
"aliases": [
["builtins", "seq"],
["lib", "trivial", "seq"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "seq",
"args": ["e1", "e2"],
"experimental": false,
"arity": 2
},
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": null,
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"position": null,
"path": ["lib", "seq"],
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},
"content": {
"content": "\nEvaluate *e1*, then evaluate and return *e2*. This ensures that a\ncomputation is strict in the value of *e1*.\n",
"source": {
"position": null,
"path": ["lib", "seq"],
"pos_type": "Lambda"
}
}
},
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"meta": {
"title": "lib.setAttr",
"path": ["lib", "setAttr"],
"aliases": [["lib", "misc", "setAttr"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 157,
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/deprecated.nix",
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"path": ["lib", "setAttr"],
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},
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"meta": {
"title": "lib.setAttrByPath",
"path": ["lib", "setAttrByPath"],
"aliases": [["lib", "attrsets", "setAttrByPath"]],
"signature": "setAttrByPath :: [String] -> Any -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/attrsets.nix",
"line": 119,
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"content_meta": {
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"path": ["lib", "attrsets", "setAttrByPath"],
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"content": {
"content": "\nCreate a new attribute set with `value` set at the nested attribute location specified in `attrPath`.\n\n# Example\n\n```nix\nsetAttrByPath [\"a\" \"b\"] 3\n=> { a = { b = 3; }; }\n```\n\n# Type\n\n```\nsetAttrByPath :: [String] -> Any -> AttrSet\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to set\n- [value] The value to set at the location described by `attrPath`\n\n",
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"path": ["lib", "attrsets", "setAttrByPath"],
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},
{
"meta": {
"title": "lib.setAttrMerge",
"path": ["lib", "setAttrMerge"],
"aliases": [["lib", "misc", "setAttrMerge"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/deprecated.nix",
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"path": ["lib", "setAttrMerge"],
"pos_type": "Lambda"
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},
"content": {
"content": null,
"source": {
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"line": 202,
"column": 18
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"path": ["lib", "setAttrMerge"],
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}
},
{
"meta": {
"title": "lib.setDefaultModuleLocation",
"path": ["lib", "setDefaultModuleLocation"],
"aliases": [["lib", "modules", "setDefaultModuleLocation"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 129,
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/modules.nix",
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"path": ["lib", "setDefaultModuleLocation"],
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"content": {
"content": "\nWrap a module with a default location for reporting errors.\n\n# Arguments\n\n- [file] \n- [m] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/modules.nix",
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"meta": {
"title": "lib.setFunctionArgs",
"path": ["lib", "setFunctionArgs"],
"aliases": [["lib", "trivial", "setFunctionArgs"]],
"signature": null,
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"primop_meta": null,
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"path": ["lib", "trivial", "setFunctionArgs"],
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"content": {
"content": "\nAdd metadata about expected function arguments to a function.\nThe metadata should match the format given by\nbuiltins.functionArgs, i.e. a set from expected argument to a bool\nrepresenting whether that argument has a default or not.\nsetFunctionArgs : (a → b) → Map String Bool → (a → b)\nThis function is necessary because you can't dynamically create a\nfunction of the { a, b ? foo, ... }: format, but some facilities\nlike callPackage expect to be able to query expected arguments.\n\n# Arguments\n\n- [f] \n- [args] \n\n",
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"meta": {
"title": "lib.setName",
"path": ["lib", "setName"],
"aliases": [["lib", "meta", "setName"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"path": ["lib", "meta", "setName"],
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"content": {
"content": "\nChange the symbolic name of a package for presentation purposes\n(i.e., so that nix-env users can tell them apart).\n\n# Arguments\n\n- [name] \n- [drv] \n\n",
"source": {
"position": {
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"meta": {
"title": "lib.setPrio",
"path": ["lib", "setPrio"],
"aliases": [["lib", "meta", "setPrio"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"path": ["lib", "meta", "setPrio"],
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"content": {
"content": "\nSet the nix-env priority of the package.\n\n# Arguments\n\n- [priority] \n\n",
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"content": "\nConvert an option, described as a list of the option parts to a\nhuman-readable version.\n\n# Example\n\n```nix\n(showOption [\"foo\" \"bar\" \"baz\"]) == \"foo.bar.baz\"\n (showOption [\"foo\" \"bar.baz\" \"tux\"]) == \"foo.\\\"bar.baz\\\".tux\"\n (showOption [\"windowManager\" \"2bwm\" \"enable\"]) == \"windowManager.\\\"2bwm\\\".enable\"\nPlaceholders will not be quoted as they are not actual values:\n (showOption [\"foo\" \"*\" \"bar\"]) == \"foo.*.bar\"\n (showOption [\"foo\" \"<name>\" \"bar\"]) == \"foo.<name>.bar\"\n```\n\n# Arguments\n\n- [parts] \n\n",
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"content": "\nSort a list based on a comparator function which compares two\nelements and returns true if the first argument is strictly below\nthe second argument. The returned list is sorted in an increasing\norder. The implementation does a quick-sort.\n\n# Example\n\n```nix\nsort (a: b: a < b) [ 5 3 7 ]\n=> [ 3 5 7 ]\n```\n",
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"content": "\nSort a list of properties. The sort priority of a property is\ndefaultOrderPriority by default, but can be overridden by wrapping the property\nusing mkOrder.\n\n# Arguments\n\n- [defs] \n\n",
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"meta": {
"title": "lib.sourceByRegex",
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"content": "\nFilter sources by a list of regular expressions.\n\n# Example\n\n```nix\nsrc = sourceByRegex ./my-subproject [\".*\\.py$\" \"^database.sql$\"]\n```\n\n# Arguments\n\n- [src] \n- [regexes] \n\n",
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"title": "lib.sourceFilesBySuffices",
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"content": "\nGet all files ending with the specified suffices from the given\nsource directory or its descendants, omitting files that do not match\nany suffix. The result of the example below will include files like\n`./dir/module.c` and `./dir/subdir/doc.xml` if present.\n\n# Example\n\n```nix\nsourceFilesBySuffices ./. [ \".xml\" \".c\" ]\n```\n\n# Type\n\n```\nsourceLike -> [String] -> Source\n```\n\n# Arguments\n\n- [src] Path or source containing the files to be returned\n- [exts] A list of file suffix strings\n\n",
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"content": "\nSplit type into two subtypes by predicate `p`, take all elements\nof the first subtype to be less than all the elements of the\nsecond subtype, compare elements of a single subtype with `yes`\nand `no` respectively.\n\n# Example\n\n```nix\nlet cmp = splitByAndCompare (hasPrefix \"foo\") compare compare; in\ncmp \"a\" \"z\" => -1\ncmp \"fooa\" \"fooz\" => -1\ncmp \"f\" \"a\" => 1\ncmp \"fooa\" \"a\" => -1\n# while\ncompare \"fooa\" \"a\" => 1\n```\n\n# Type\n\n```\n(a -> bool) -> (a -> a -> int) -> (a -> a -> int) -> (a -> a -> int)\n```\n\n# Arguments\n\n- [p] Predicate\n- [yes] Comparison function if predicate holds for both values\n- [no] Comparison function if predicate holds for neither value\n- [a] First value to compare\n- [b] Second value to compare\n\n",
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"meta": {
"title": "lib.stringAsChars",
"path": ["lib", "stringAsChars"],
"aliases": [["lib", "strings", "stringAsChars"]],
"signature": "stringAsChars :: (string -> string) -> string -> string\n",
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"content": {
"content": "\nManipulate a string character by character and replace them by\nstrings before concatenating the results.\n\n# Example\n\n```nix\nstringAsChars (x: if x == \"a\" then \"i\" else x) \"nax\"\n=> \"nix\"\n```\n\n# Type\n\n```\nstringAsChars :: (string -> string) -> string -> string\n```\n\n# Arguments\n\n- [f] Function to map over each individual character\n- [s] Input string\n\n",
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"meta": {
"title": "lib.stringLength",
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"signature": null,
"is_primop": true,
"primop_meta": {
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"content": {
"content": "\nReturn the length of the string *e*. If *e* is not a string,\nevaluation is aborted.\n",
"source": {
"position": null,
"path": ["lib", "stringLength"],
"pos_type": "Lambda"
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"meta": {
"title": "lib.stringToCharacters",
"path": ["lib", "stringToCharacters"],
"aliases": [["lib", "strings", "stringToCharacters"]],
"signature": "stringToCharacters :: string -> [string]\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nConvert a string to a list of characters (i.e. singleton strings).\nThis allows you to, e.g., map a function over each character. However,\nnote that this will likely be horribly inefficient; Nix is not a\ngeneral purpose programming language. Complex string manipulations\nshould, if appropriate, be done in a derivation.\nAlso note that Nix treats strings as a list of bytes and thus doesn't\nhandle unicode.\n\n# Example\n\n```nix\nstringToCharacters \"\"\n=> [ ]\nstringToCharacters \"abc\"\n=> [ \"a\" \"b\" \"c\" ]\nstringToCharacters \"🦄\"\n=> [ \"<22>\" \"<22>\" \"<22>\" \"<22>\" ]\n```\n\n# Type\n\n```\nstringToCharacters :: string -> [string]\n```\n\n# Arguments\n\n- [s] \n\n",
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},
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"meta": {
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"aliases": [
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["lib", "trivial", "sub"]
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"signature": null,
"is_primop": true,
"primop_meta": {
"name": "sub",
"args": ["e1", "e2"],
"experimental": false,
"arity": 2
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"path": ["lib", "sub"],
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},
"content": {
"content": "\nReturn the difference between the numbers *e1* and *e2*.\n",
"source": {
"position": null,
"path": ["lib", "sub"],
"pos_type": "Lambda"
}
}
},
{
"meta": {
"title": "lib.sublist",
"path": ["lib", "sublist"],
"aliases": [["lib", "lists", "sublist"]],
"signature": "sublist :: int -> int -> [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "lists", "sublist"],
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"content": {
"content": "\nReturn a list consisting of at most `count` elements of `list`,\nstarting at index `start`.\n\n# Example\n\n```nix\nsublist 1 3 [ \"a\" \"b\" \"c\" \"d\" \"e\" ]\n=> [ \"b\" \"c\" \"d\" ]\nsublist 1 3 [ ]\n=> [ ]\n```\n\n# Type\n\n```\nsublist :: int -> int -> [a] -> [a]\n```\n\n# Arguments\n\n- [start] Index at which to start the sublist\n- [count] Number of elements to take\n- [list] Input list\n\n",
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"meta": {
"title": "lib.substring",
"path": ["lib", "substring"],
"aliases": [
["builtins", "substring"],
["lib", "strings", "substring"]
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"signature": null,
"is_primop": true,
"primop_meta": {
"name": "substring",
"args": ["start", "len", "s"],
"experimental": false,
"arity": 3
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"attr_position": {
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"content": {
"content": "\nReturn the substring of *s* from character position *start*\n(zero-based) up to but not including *start + len*. If *start* is\ngreater than the length of the string, an empty string is returned,\nand if *start + len* lies beyond the end of the string, only the\nsubstring up to the end of the string is returned. *start* must be\nnon-negative. For example,\n\n```nix\nbuiltins.substring 0 3 \"nixos\"\n```\n\nevaluates to `\"nix\"`.\n",
"source": {
"position": null,
"path": ["lib", "substring"],
"pos_type": "Lambda"
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}
},
{
"meta": {
"title": "lib.subtractLists",
"path": ["lib", "subtractLists"],
"aliases": [["lib", "lists", "subtractLists"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "lists", "subtractLists"],
"pos_type": "Attribute"
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},
"content": {
"content": "\nSubtracts list 'e' from another list. O(nm) complexity.\n\n# Example\n\n```nix\nsubtractLists [ 3 2 ] [ 1 2 3 4 5 3 ]\n=> [ 1 4 5 ]\n```\n\n# Arguments\n\n- [e] \n\n",
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"path": ["lib", "lists", "subtractLists"],
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},
{
"meta": {
"title": "lib.tail",
"path": ["lib", "tail"],
"aliases": [
["builtins", "tail"],
["lib", "lists", "tail"],
["lib", "strings", "tail"]
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"signature": null,
"is_primop": true,
"primop_meta": {
"name": "tail",
"args": ["list"],
"experimental": false,
"arity": 1
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"content": {
"content": "\nReturn the list without its first item; abort evaluation if\nthe argument isn’t a list or is an empty list.\n\n> **Warning**\n>\n> This function should generally be avoided since it's inefficient:\n> unlike Haskell's `tail`, it takes O(n) time, so recursing over a\n> list by repeatedly calling `tail` takes O(n^2) time.\n",
"source": {
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},
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"meta": {
"title": "lib.take",
"path": ["lib", "take"],
"aliases": [["lib", "lists", "take"]],
"signature": "take :: int -> [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nReturn the first (at most) N elements of a list.\n\n# Example\n\n```nix\ntake 2 [ \"a\" \"b\" \"c\" \"d\" ]\n=> [ \"a\" \"b\" ]\ntake 2 [ ]\n=> [ ]\n```\n\n# Type\n\n```\ntake :: int -> [a] -> [a]\n```\n\n# Arguments\n\n- [count] Number of elements to take\n\n",
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},
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"meta": {
"title": "lib.testAllTrue",
"path": ["lib", "testAllTrue"],
"aliases": [["lib", "debug", "testAllTrue"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 153,
"column": 25
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/debug.nix",
"line": 356,
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"path": ["lib", "debug", "testAllTrue"],
"pos_type": "Attribute"
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"content": {
"content": "\nCreate a test assuming that list elements are `true`.\n\n# Example\n\n```nix\n{ testX = allTrue [ true ]; }\n```\n\n# Arguments\n\n- [expr] \n\n",
"source": {
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"meta": {
"title": "lib.textClosureList",
"path": ["lib", "textClosureList"],
"aliases": [["lib", "stringsWithDeps", "textClosureList"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "stringsWithDeps", "textClosureList"],
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"content": {
"content": "\n!!! The interface of this function is kind of messed up, since\nit's way too overloaded and almost but not quite computes a\ntopological sort of the depstrings.\n\n# Arguments\n\n- [predefined] \n- [arg] \n\n",
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"meta": {
"title": "lib.textClosureMap",
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"signature": null,
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"meta": {
"title": "lib.throwIf",
"path": ["lib", "throwIf"],
"aliases": [["lib", "trivial", "throwIf"]],
"signature": "bool -> string -> a -> a\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "trivial", "throwIf"],
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"content": {
"content": "\nLike throwIfNot, but negated (throw if the first argument is `true`).\n\n# Type\n\n```\nbool -> string -> a -> a\n```\n\n# Arguments\n\n- [cond] \n- [msg] \n\n",
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"aliases": [["lib", "trivial", "throwIfNot"]],
"signature": "bool -> string -> a -> a\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nLike the `assert b; e` expression, but with a custom error message and\nwithout the semicolon.\nIf true, return the identity function, `r: r`.\nIf false, throw the error message.\nCalls can be juxtaposed using function application, as `(r: r) a = a`, so\n`(r: r) (r: r) a = a`, and so forth.\n\n# Example\n\n```nix\nthrowIfNot (lib.isList overlays) \"The overlays argument to nixpkgs must be a list.\"\nlib.foldr (x: throwIfNot (lib.isFunction x) \"All overlays passed to nixpkgs must be functions.\") (r: r) overlays\npkgs\n```\n\n# Type\n\n```\nbool -> string -> a -> a\n```\n\n# Arguments\n\n- [cond] \n- [msg] \n\n",
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}
},
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"meta": {
"title": "lib.toBaseDigits",
"path": ["lib", "toBaseDigits"],
"aliases": [["lib", "trivial", "toBaseDigits"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\n`toBaseDigits base i` converts the positive integer i to a list of its\ndigits in the given base. For example:\ntoBaseDigits 10 123 => [ 1 2 3 ]\ntoBaseDigits 2 6 => [ 1 1 0 ]\ntoBaseDigits 16 250 => [ 15 10 ]\n\n# Arguments\n\n- [base] \n- [i] \n\n",
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},
{
"meta": {
"title": "lib.toDerivation",
"path": ["lib", "toDerivation"],
"aliases": [["lib", "attrsets", "toDerivation"]],
"signature": "toDerivation :: Path -> Derivation\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "attrsets", "toDerivation"],
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"content": "\nConverts a store path to a fake derivation.\n\n# Type\n\n```\ntoDerivation :: Path -> Derivation\n```\n\n# Arguments\n\n- [path] A store path to convert to a derivation.\n\n",
"source": {
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"meta": {
"title": "lib.toFunction",
"path": ["lib", "toFunction"],
"aliases": [["lib", "trivial", "toFunction"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": {
"content": "\nTurns any non-callable values into constant functions.\nReturns callable values as is.\n\n# Example\n\n```nix\nnix-repl> lib.toFunction 1 2\n1\nnix-repl> lib.toFunction (x: x + 1) 2\n3\n```\n\n# Arguments\n\n- [v] Any value\n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/trivial.nix",
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"path": ["lib", "trivial", "toFunction"],
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{
"meta": {
"title": "lib.toHexString",
"path": ["lib", "toHexString"],
"aliases": [["lib", "trivial", "toHexString"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 73,
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"line": 823,
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"path": ["lib", "trivial", "toHexString"],
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"content": {
"content": "\nConvert the given positive integer to a string of its hexadecimal\nrepresentation. For example:\ntoHexString 0 => \"0\"\ntoHexString 16 => \"10\"\ntoHexString 250 => \"FA\"\n\n# Arguments\n\n- [i] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/trivial.nix",
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"path": ["lib", "trivial", "toHexString"],
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"meta": {
"title": "lib.toInt",
"path": ["lib", "toInt"],
"aliases": [["lib", "strings", "toInt"]],
"signature": "string -> int\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
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"path": ["lib", "strings", "toInt"],
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"content": {
"content": "\nParse a string as an int. Does not support parsing of integers with preceding zero due to\nambiguity between zero-padded and octal numbers. See toIntBase10.\n\n# Example\n\n```nix\ntoInt \"1337\"\n=> 1337\ntoInt \"-4\"\n=> -4\ntoInt \" 123 \"\n=> 123\ntoInt \"00024\"\n=> error: Ambiguity in interpretation of 00024 between octal and zero padded integer.\ntoInt \"3.14\"\n=> error: floating point JSON numbers are not supported\n```\n\n# Type\n\n```\nstring -> int\n```\n\n# Arguments\n\n- [str] \n\n",
"source": {
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"meta": {
"title": "lib.toIntBase10",
"path": ["lib", "toIntBase10"],
"aliases": [["lib", "strings", "toIntBase10"]],
"signature": "string -> int\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 98,
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/strings.nix",
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"path": ["lib", "strings", "toIntBase10"],
"pos_type": "Attribute"
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"content": {
"content": "\nParse a string as a base 10 int. This supports parsing of zero-padded integers.\n\n# Example\n\n```nix\ntoIntBase10 \"1337\"\n=> 1337\ntoIntBase10 \"-4\"\n=> -4\ntoIntBase10 \" 123 \"\n=> 123\ntoIntBase10 \"00024\"\n=> 24\ntoIntBase10 \"3.14\"\n=> error: floating point JSON numbers are not supported\n```\n\n# Type\n\n```\nstring -> int\n```\n\n# Arguments\n\n- [str] \n\n",
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"meta": {
"title": "lib.toList",
"path": ["lib", "toList"],
"aliases": [["lib", "lists", "toList"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
"column": 25
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 627,
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"line": 627,
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"path": ["lib", "lists", "toList"],
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"content": {
"content": "\nIf argument is a list, return it; else, wrap it in a singleton\nlist. If you're using this, you should almost certainly\nreconsider if there isn't a more \"well-typed\" approach.\n\n# Example\n\n```nix\ntoList [ 1 2 ]\n=> [ 1 2 ]\ntoList \"hi\"\n=> [ \"hi \"]\n```\n\n# Arguments\n\n- [x] \n\n",
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"meta": {
"title": "lib.toLower",
"path": ["lib", "toLower"],
"aliases": [["lib", "strings", "toLower"]],
"signature": "toLower :: string -> string\n",
"is_primop": true,
"primop_meta": {
"name": null,
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"arity": null
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"attr_position": {
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"path": ["lib", "strings", "toLower"],
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"content": {
"content": "\nConverts an ASCII string to lower-case.\n\n# Example\n\n```nix\ntoLower \"HOME\"\n=> \"home\"\n```\n\n# Type\n\n```\ntoLower :: string -> string\n```\n",
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"meta": {
"title": "lib.toShellVar",
"path": ["lib", "toShellVar"],
"aliases": [["lib", "strings", "toShellVar"]],
"signature": "string -> (string | listOf string | attrsOf string) -> string\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"path": ["lib", "strings", "toShellVar"],
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"content": {
"content": "\nTranslate a Nix value into a shell variable declaration, with proper escaping.\nThe value can be a string (mapped to a regular variable), a list of strings\n(mapped to a Bash-style array) or an attribute set of strings (mapped to a\nBash-style associative array). Note that \"string\" includes string-coercible\nvalues like paths or derivations.\nStrings are translated into POSIX sh-compatible code; lists and attribute sets\nassume a shell that understands Bash syntax (e.g. Bash or ZSH).\n\n# Example\n\n```nix\n''\n ${toShellVar \"foo\" \"some string\"}\n [[ \"$foo\" == \"some string\" ]]\n''\n```\n\n# Type\n\n```\nstring -> (string | listOf string | attrsOf string) -> string\n```\n\n# Arguments\n\n- [name] \n- [value] \n\n",
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}
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},
{
"meta": {
"title": "lib.toShellVars",
"path": ["lib", "toShellVars"],
"aliases": [["lib", "strings", "toShellVars"]],
"signature": "attrsOf (string | listOf string | attrsOf string) -> string\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
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"content": "\nTranslate an attribute set into corresponding shell variable declarations\nusing `toShellVar`.\n\n# Example\n\n```nix\nlet\n foo = \"value\";\n bar = foo;\nin ''\n ${toShellVars { inherit foo bar; }}\n [[ \"$foo\" == \"$bar\" ]]\n''\n```\n\n# Type\n\n```\nattrsOf (string | listOf string | attrsOf string) -> string\n```\n\n# Arguments\n\n- [vars] \n\n",
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"meta": {
"title": "lib.toUpper",
"path": ["lib", "toUpper"],
"aliases": [["lib", "strings", "toUpper"]],
"signature": "toUpper :: string -> string\n",
"is_primop": true,
"primop_meta": {
"name": null,
"args": null,
"experimental": null,
"arity": null
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"attr_position": {
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"content": {
"content": "\nConverts an ASCII string to upper-case.\n\n# Example\n\n```nix\ntoUpper \"home\"\n=> \"HOME\"\n```\n\n# Type\n\n```\ntoUpper :: string -> string\n```\n",
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"meta": {
"title": "lib.toposort",
"path": ["lib", "toposort"],
"aliases": [["lib", "lists", "toposort"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/default.nix",
"line": 92,
"column": 25
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 903,
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"content": {
"content": "\nSort a list based on a partial ordering using DFS. This\nimplementation is O(N^2), if your ordering is linear, use `sort`\ninstead.\n`before a b == true` means that `b` should be after `a`\nin the result.\n\n# Example\n\n```nix\ntoposort hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" ]\n == { result = [ \"/\" \"/home\" \"/home/user\" \"other\" ]; }\ntoposort hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" \"/\" ]\n == { cycle = [ \"/home/user\" \"/\" \"/\" ]; # path leading to a cycle\n loops = [ \"/\" ]; } # loops back to these elements\ntoposort hasPrefix [ \"other\" \"/home/user\" \"/home\" \"/\" ]\n == { result = [ \"other\" \"/\" \"/home\" \"/home/user\" ]; }\ntoposort (a: b: a < b) [ 3 2 1 ] == { result = [ 1 2 3 ]; }\n```\n\n# Arguments\n\n- [before] \n- [list] \n\n",
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"meta": {
"title": "lib.trace",
"path": ["lib", "trace"],
"aliases": [["builtins", "trace"]],
"signature": null,
"is_primop": true,
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"name": "trace",
"args": ["e1", "e2"],
"experimental": false,
"arity": 2
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"path": ["lib", "trace"],
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"content": {
"content": "\nEvaluate *e1* and print its abstract syntax representation on\nstandard error. Then return *e2*. This function is useful for\ndebugging.\n",
"source": {
"position": null,
"path": ["lib", "trace"],
"pos_type": "Lambda"
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},
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"meta": {
"title": "lib.traceFnSeqN",
"path": ["lib", "traceFnSeqN"],
"aliases": [["lib", "debug", "traceFnSeqN"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "debug", "traceFnSeqN"],
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"content": {
"content": "\nTrace the input and output of a function `f` named `name`,\nboth down to `depth`.\nThis is useful for adding around a function call,\nto see the before/after of values as they are transformed.\n\n# Example\n\n```nix\ntraceFnSeqN 2 \"id\" (x: x) { a.b.c = 3; }\ntrace: { fn = \"id\"; from = { a.b = {…}; }; to = { a.b = {…}; }; }\n=> { a.b.c = 3; }\n```\n\n# Arguments\n\n- [depth] \n- [name] \n- [f] \n- [v] \n\n",
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},
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"meta": {
"title": "lib.traceIf",
"path": ["lib", "traceIf"],
"aliases": [["lib", "debug", "traceIf"]],
"signature": "traceIf :: bool -> string -> a -> a\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"content": {
"content": "\nConditionally trace the supplied message, based on a predicate.\n\n# Example\n\n```nix\ntraceIf true \"hello\" 3\ntrace: hello\n=> 3\n```\n\n# Type\n\n```\ntraceIf :: bool -> string -> a -> a\n```\n\n# Arguments\n\n- [pred] Predicate to check\n- [msg] Message that should be traced\n- [x] Value to return\n\n",
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"meta": {
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"signature": "traceSeq :: a -> b -> b\n",
"is_primop": false,
"primop_meta": null,
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"content": "\n`builtins.trace`, but the value is `builtins.deepSeq`ed first.\n\n# Example\n\n```nix\ntrace { a.b.c = 3; } null\ntrace: { a = <CODE>; }\n=> null\ntraceSeq { a.b.c = 3; } null\ntrace: { a = { b = { c = 3; }; }; }\n=> null\n```\n\n# Type\n\n```\ntraceSeq :: a -> b -> b\n```\n\n# Arguments\n\n- [x] The value to trace\n- [y] The value to return\n\n",
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"meta": {
"title": "lib.traceSeqN",
"path": ["lib", "traceSeqN"],
"aliases": [["lib", "debug", "traceSeqN"]],
"signature": "traceSeqN :: Int -> a -> b -> b\n",
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"content": {
"content": "\nLike `traceSeq`, but only evaluate down to depth n.\nThis is very useful because lots of `traceSeq` usages\nlead to an infinite recursion.\n\n# Example\n\n```nix\ntraceSeqN 2 { a.b.c = 3; } null\ntrace: { a = { b = {…}; }; }\n=> null\n```\n\n# Type\n\n```\ntraceSeqN :: Int -> a -> b -> b\n```\n\n# Arguments\n\n- [depth] \n- [x] \n- [y] \n\n",
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"meta": {
"title": "lib.traceVal",
"path": ["lib", "traceVal"],
"aliases": [
["lib", "fileset", "traceVal"],
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"signature": "traceVal :: FileSet -> FileSet\n",
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"path": ["lib", "fileset", "traceVal"],
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"content": {
"content": "\nIncrementally evaluate and trace a file set in a pretty way.\nThis function is only intended for debugging purposes.\nThe exact tracing format is unspecified and may change.\nThis function returns the given file set.\nIn comparison, [`trace`](#function-library-lib.fileset.trace) takes another argument to return.\nThis variant is useful for tracing file sets passed as arguments to other functions.\n\n# Example\n\n```nix\ntoSource {\n root = ./.;\n fileset = traceVal (unions [\n ./Makefile\n ./src\n ./tests/run.sh\n ]);\n}\n=>\ntrace: /home/user/src/myProject\ntrace: - Makefile (regular)\ntrace: - src (all files in directory)\ntrace: - tests\ntrace: - run.sh (regular)\n\"/nix/store/...-source\"\n```\n\n# Type\n\n```\ntraceVal :: FileSet -> FileSet\n```\n\n# Arguments\n\n- [fileset] The file set to trace and return. \n This argument can also be a path,\n which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n\n",
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"title": "lib.traceValFn",
"path": ["lib", "traceValFn"],
"aliases": [["lib", "debug", "traceValFn"]],
"signature": "traceValFn :: (a -> b) -> a -> a\n",
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"content": "\nTrace the supplied value after applying a function to it, and\nreturn the original value.\n\n# Example\n\n```nix\ntraceValFn (v: \"mystring ${v}\") \"foo\"\ntrace: mystring foo\n=> \"foo\"\n```\n\n# Type\n\n```\ntraceValFn :: (a -> b) -> a -> a\n```\n\n# Arguments\n\n- [f] Function to apply\n- [x] Value to trace and return\n\n",
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"title": "lib.traceValSeq",
"path": ["lib", "traceValSeq"],
"aliases": [["lib", "debug", "traceValSeq"]],
"signature": null,
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"path": ["lib", "debug", "traceValSeq"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeq`.\n",
"source": {
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"path": ["lib", "traceValSeqFn"],
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"path": ["lib", "debug", "traceValSeqFn"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeq` that applies a\nprovided function to the value to be traced after `deepSeq`ing\nit.\n\n# Arguments\n\n- [f] Function to apply\n- [v] Value to trace\n\n",
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"path": ["lib", "debug", "traceValSeqN"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeqN`.\n",
"source": {
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"title": "lib.traceValSeqNFn",
"path": ["lib", "traceValSeqNFn"],
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"signature": null,
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"path": ["lib", "debug", "traceValSeqNFn"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeqN` that applies a\nprovided function to the value to be traced.\n\n# Arguments\n\n- [f] Function to apply\n- [depth] \n- [v] Value to trace\n\n",
"source": {
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"title": "lib.unifyModuleSyntax",
"path": ["lib", "unifyModuleSyntax"],
"aliases": [["lib", "modules", "unifyModuleSyntax"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "unifyModuleSyntax"],
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"content": {
"content": "\nMassage a module into canonical form, that is, a set consisting\nof ‘options’, ‘config’ and ‘imports’ attributes.\n\n# Arguments\n\n- [file] \n- [key] \n- [m] \n\n",
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"path": ["lib", "uniqList"],
"aliases": [["lib", "misc", "uniqList"]],
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"meta": {
"title": "lib.uniqListExt",
"path": ["lib", "uniqListExt"],
"aliases": [["lib", "misc", "uniqListExt"]],
"signature": null,
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"primop_meta": null,
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},
{
"meta": {
"title": "lib.unique",
"path": ["lib", "unique"],
"aliases": [
["lib", "types", "unique"],
["lib", "lists", "unique"]
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"signature": "unique :: [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "lists", "unique"],
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"content": {
"content": "\nRemove duplicate elements from the list. O(n^2) complexity.\n\n# Example\n\n```nix\nunique [ 3 2 3 4 ]\n=> [ 3 2 4 ]\n```\n\n# Type\n\n```\nunique :: [a] -> [a]\n```\n",
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"meta": {
"title": "lib.updateManyAttrsByPath",
"path": ["lib", "updateManyAttrsByPath"],
"aliases": [["lib", "attrsets", "updateManyAttrsByPath"]],
"signature": "updateManyAttrsByPath :: [{ path :: [String]; update :: (Any -> Any); }] -> AttrSet -> AttrSet\n",
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"content": {
"content": "\nUpdate or set specific paths of an attribute set.\nTakes a list of updates to apply and an attribute set to apply them to,\nand returns the attribute set with the updates applied. Updates are\nrepresented as `{ path = ...; update = ...; }` values, where `path` is a\nlist of strings representing the attribute path that should be updated,\nand `update` is a function that takes the old value at that attribute path\nas an argument and returns the new\nvalue it should be.\nProperties:\n- Updates to deeper attribute paths are applied before updates to more\nshallow attribute paths\n- Multiple updates to the same attribute path are applied in the order\nthey appear in the update list\n- If any but the last `path` element leads into a value that is not an\nattribute set, an error is thrown\n- If there is an update for an attribute path that doesn't exist,\naccessing the argument in the update function causes an error, but\nintermediate attribute sets are implicitly created as needed\n\n# Example\n\n```nix\nupdateManyAttrsByPath [\n {\n path = [ \"a\" \"b\" ];\n update = old: { d = old.c; };\n }\n {\n path = [ \"a\" \"b\" \"c\" ];\n update = old: old + 1;\n }\n {\n path = [ \"x\" \"y\" ];\n update = old: \"xy\";\n }\n] { a.b.c = 0; }\n=> { a = { b = { d = 1; }; }; x = { y = \"xy\"; }; }\n```\n\n# Type\n\n```\nupdateManyAttrsByPath :: [{ path :: [String]; update :: (Any -> Any); }] -> AttrSet -> AttrSet\n```\n",
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"title": "lib.updateName",
"path": ["lib", "updateName"],
"aliases": [["lib", "meta", "updateName"]],
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"path": ["lib", "meta", "updateName"],
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"content": {
"content": "\nLike `setName`, but takes the previous name as an argument.\n\n# Example\n\n```nix\nupdateName (oldName: oldName + \"-experimental\") somePkg\n```\n\n# Arguments\n\n- [updater] \n- [drv] \n\n",
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"content": "\nReturn true if string v1 denotes a version equal to or newer than v2.\n\n# Example\n\n```nix\nversionAtLeast \"1.1\" \"1.0\"\n=> true\nversionAtLeast \"1.1\" \"1.1\"\n=> true\nversionAtLeast \"1.1\" \"1.2\"\n=> false\n```\n\n# Arguments\n\n- [v1] \n- [v2] \n\n",
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"content": "\nReturn true if string v1 denotes a version older than v2.\n\n# Example\n\n```nix\nversionOlder \"1.1\" \"1.2\"\n=> true\nversionOlder \"1.1\" \"1.1\"\n=> false\n```\n\n# Arguments\n\n- [v1] \n- [v2] \n\n",
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"content": "\nPrint a warning before returning the second argument. This function behaves\nlike `builtins.trace`, but requires a string message and formats it as a\nwarning, including the `warning: ` prefix.\nTo get a call stack trace and abort evaluation, set the environment variable\n`NIX_ABORT_ON_WARN=true` and set the Nix options `--option pure-eval false --show-trace`\n\n# Type\n\n```\nstring -> a -> a\n```\n",
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"content": "\nLike warn, but only warn when the first argument is `true`.\n\n# Type\n\n```\nbool -> string -> a -> a\n```\n\n# Arguments\n\n- [cond] \n- [msg] \n\n",
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"content": "\nLike warnIf, but negated (warn if the first argument is `false`).\n\n# Type\n\n```\nbool -> string -> a -> a\n```\n\n# Arguments\n\n- [cond] \n- [msg] \n\n",
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"content": "\nCreate an --{with,without}-<feature> string that can be passed to\nstandard GNU Autoconf scripts.\n\n# Example\n\n```nix\nwithFeature true \"shared\"\n=> \"--with-shared\"\nwithFeature false \"shared\"\n=> \"--without-shared\"\n```\n\n# Arguments\n\n- [flag] \n- [feature] \n\n",
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"content": "\nCreate an --{with-<feature>=<value>,without-<feature>} string that can be passed to\nstandard GNU Autoconf scripts.\n\n# Example\n\n```nix\nwithFeatureAs true \"shared\" \"foo\"\n=> \"--with-shared=foo\"\nwithFeatureAs false \"shared\" (throw \"ignored\")\n=> \"--without-shared\"\n```\n\n# Arguments\n\n- [flag] \n- [feature] \n- [value] \n\n",
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"content": {
"content": "\nMerge sets of attributes and use the function f to merge attribute values.\nLike `lib.attrsets.zipAttrsWithNames` with all key names are passed for `names`.\nImplementation note: Common names appear multiple times in the list of\nnames, hopefully this does not affect the system because the maximal\nlaziness avoid computing twice the same expression and `listToAttrs` does\nnot care about duplicated attribute names.\n\n# Example\n\n```nix\nzipAttrsWith (name: values: values) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; b = [\"z\"]; }\n```\n\n# Type\n\n```\nzipAttrsWith :: (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n",
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"content": "\nMerge sets of attributes and combine each attribute value in to a list.\nLike `lib.attrsets.zipAttrsWith` with `(name: values: values)` as the function.\n\n# Example\n\n```nix\nzipAttrs [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; b = [\"z\"]; }\n```\n\n# Type\n\n```\nzipAttrs :: [ AttrSet ] -> AttrSet\n```\n\n# Arguments\n\n- [sets] List of attribute sets to zip together.\n\n",
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"content": "\nMerge sets of attributes and use the function f to merge attribute values.\nLike `lib.attrsets.zipAttrsWithNames` with all key names are passed for `names`.\nImplementation note: Common names appear multiple times in the list of\nnames, hopefully this does not affect the system because the maximal\nlaziness avoid computing twice the same expression and `listToAttrs` does\nnot care about duplicated attribute names.\n\n# Example\n\n```nix\nzipAttrsWith (name: values: values) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; b = [\"z\"]; }\n```\n\n# Type\n\n```\nzipAttrsWith :: (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n",
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"content": "\nMerge sets of attributes and use the function `f` to merge attributes\nvalues.\n\n# Example\n\n```nix\nzipAttrsWithNames [\"a\"] (name: vs: vs) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; }\n```\n\n# Type\n\n```\nzipAttrsWithNames :: [ String ] -> (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n\n# Arguments\n\n- [names] List of attribute names to zip.\n- [f] A function, accepts an attribute name, all the values, and returns a combined value.\n- [sets] List of values from the list of attribute sets.\n\n",
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"content": "\nMerges two lists of the same size together. If the sizes aren't the same\nthe merging stops at the shortest. How both lists are merged is defined\nby the first argument.\n\n# Example\n\n```nix\nzipListsWith (a: b: a + b) [\"h\" \"l\"] [\"e\" \"o\"]\n=> [\"he\" \"lo\"]\n```\n\n# Type\n\n```\nzipListsWith :: (a -> b -> c) -> [a] -> [b] -> [c]\n```\n\n# Arguments\n\n- [f] Function to zip elements of both lists\n- [fst] First list\n- [snd] Second list\n\n",
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"content": "\nMerge sets of attributes and use the function `f` to merge attributes\nvalues.\n\n# Example\n\n```nix\nzipAttrsWithNames [\"a\"] (name: vs: vs) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; }\n```\n\n# Type\n\n```\nzipAttrsWithNames :: [ String ] -> (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n\n# Arguments\n\n- [names] List of attribute names to zip.\n- [f] A function, accepts an attribute name, all the values, and returns a combined value.\n- [sets] List of values from the list of attribute sets.\n\n",
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"title": "lib.asserts.assertEachOneOf",
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"content": "\nSpecialized `assertMsg` for checking if every one of `vals` is one of the elements\nof the list `xs`. Useful for checking lists of supported attributes.\n\n# Example\n\n```nix\nlet sslLibraries = [ \"libressl\" \"bearssl\" ];\nin assertEachOneOf \"sslLibraries\" sslLibraries [ \"openssl\" \"bearssl\" ]\nstderr> error: each element in sslLibraries must be one of [\nstderr> \"openssl\"\nstderr> \"bearssl\"\nstderr> ], but is: [\nstderr> \"libressl\"\nstderr> \"bearssl\"\nstderr> ]\n```\n\n# Type\n\n```\nassertEachOneOf :: String -> List ComparableVal -> List ComparableVal -> Bool\n```\n\n# Arguments\n\n- [name] The name of the variable the user entered `val` into, for inclusion in the error message\n- [vals] The list of values of what the user provided, to be compared against the values in `xs`\n- [xs] The list of valid values\n\n",
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"title": "lib.asserts.assertMsg",
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"signature": "assertMsg :: Bool -> String -> Bool\n",
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"content": "\nThrow if pred is false, else return pred.\nIntended to be used to augment asserts with helpful error messages.\n\n# Example\n\n```nix\nassertMsg false \"nope\"\nstderr> error: nope\nassert assertMsg (\"foo\" == \"bar\") \"foo is not bar, silly\"; \"\"\nstderr> error: foo is not bar, silly\n```\n\n# Type\n\n```\nassertMsg :: Bool -> String -> Bool\n```\n\n# Arguments\n\n- [pred] Predicate that needs to succeed, otherwise `msg` is thrown\n- [msg] Message to throw in case `pred` fails\n\n",
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"title": "lib.asserts.assertOneOf",
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"content": {
"content": "\nSpecialized `assertMsg` for checking if `val` is one of the elements\nof the list `xs`. Useful for checking enums.\n\n# Example\n\n```nix\nlet sslLibrary = \"libressl\";\nin assertOneOf \"sslLibrary\" sslLibrary [ \"openssl\" \"bearssl\" ]\nstderr> error: sslLibrary must be one of [\nstderr> \"openssl\"\nstderr> \"bearssl\"\nstderr> ], but is: \"libressl\"\n```\n\n# Type\n\n```\nassertOneOf :: String -> ComparableVal -> List ComparableVal -> Bool\n```\n\n# Arguments\n\n- [name] The name of the variable the user entered `val` into, for inclusion in the error message\n- [val] The value of what the user provided, to be compared against the values in `xs`\n- [xs] The list of valid values\n\n",
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"meta": {
"title": "lib.attrsets.attrByPath",
"path": ["lib", "attrsets", "attrByPath"],
"aliases": [["lib", "attrByPath"]],
"signature": "attrByPath :: [String] -> Any -> AttrSet -> Any\n",
"is_primop": false,
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"attr_position": {
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"path": ["lib", "attrsets", "attrByPath"],
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"content": {
"content": "\nReturn an attribute from nested attribute sets.\n\n# Example\n\n```nix\nx = { a = { b = 3; }; }\n# [\"a\" \"b\"] is equivalent to x.a.b\n# 6 is a default value to return if the path does not exist in attrset\nattrByPath [\"a\" \"b\"] 6 x\n=> 3\nattrByPath [\"z\" \"z\"] 6 x\n=> 6\n```\n\n# Type\n\n```\nattrByPath :: [String] -> Any -> AttrSet -> Any\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to return from `set`\n- [default] Default value if `attrPath` does not resolve to an existing value\n- [set] The nested attribute set to select values from\n\n",
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"content": "\nReturn the names of the attributes in the set *set* in an\nalphabetically sorted list. For instance, `builtins.attrNames { y\n= 1; x = \"foo\"; }` evaluates to `[ \"x\" \"y\" ]`.\n",
"source": {
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"meta": {
"title": "lib.attrsets.attrVals",
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"aliases": [["lib", "attrVals"]],
"signature": "attrVals :: [String] -> AttrSet -> [Any]\n",
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"content": {
"content": "\nReturn the specified attributes from a set.\n\n# Example\n\n```nix\nattrVals [\"a\" \"b\" \"c\"] as\n=> [as.a as.b as.c]\n```\n\n# Type\n\n```\nattrVals :: [String] -> AttrSet -> [Any]\n```\n\n# Arguments\n\n- [nameList] The list of attributes to fetch from `set`. Each attribute name must exist on the attrbitue set\n- [set] The set to get attribute values from\n\n",
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"title": "lib.attrsets.attrValues",
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"signature": "attrValues :: AttrSet -> [Any]\n",
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"content": "\nReturn the values of all attributes in the given set, sorted by\nattribute name.\n\n# Example\n\n```nix\nattrValues {c = 3; a = 1; b = 2;}\n=> [1 2 3]\n```\n\n# Type\n\n```\nattrValues :: AttrSet -> [Any]\n```\n",
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"title": "lib.attrsets.attrsToList",
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"content": "\nDeconstruct an attrset to a list of name-value pairs as expected by [`builtins.listToAttrs`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-listToAttrs).\nEach element of the resulting list is an attribute set with these attributes:\n- `name` (string): The name of the attribute\n- `value` (any): The value of the attribute\nThe following is always true:\n```nix\nbuiltins.listToAttrs (attrsToList attrs) == attrs\n```\n:::{.warning}\nThe opposite is not always true. In general expect that\n```nix\nattrsToList (builtins.listToAttrs list) != list\n```\nThis is because the `listToAttrs` removes duplicate names and doesn't preserve the order of the list.\n:::\n\n# Example\n\n```nix\nattrsToList { foo = 1; bar = \"asdf\"; }\n=> [ { name = \"bar\"; value = \"asdf\"; } { name = \"foo\"; value = 1; } ]\n```\n\n# Type\n\n```\nattrsToList :: AttrSet -> [ { name :: String; value :: Any; } ]\n```\n",
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"meta": {
"title": "lib.attrsets.cartesianProductOfSets",
"path": ["lib", "attrsets", "cartesianProductOfSets"],
"aliases": [["lib", "cartesianProductOfSets"]],
"signature": "cartesianProductOfSets :: AttrSet -> [AttrSet]\n",
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"content": "\nReturn the cartesian product of attribute set value combinations.\n\n# Example\n\n```nix\ncartesianProductOfSets { a = [ 1 2 ]; b = [ 10 20 ]; }\n=> [\n { a = 1; b = 10; }\n { a = 1; b = 20; }\n { a = 2; b = 10; }\n { a = 2; b = 20; }\n ]\n```\n\n# Type\n\n```\ncartesianProductOfSets :: AttrSet -> [AttrSet]\n```\n\n# Arguments\n\n- [attrsOfLists] Attribute set with attributes that are lists of values\n\n",
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"title": "lib.attrsets.catAttrs",
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"aliases": [
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"signature": "catAttrs :: String -> [AttrSet] -> [Any]\n",
"is_primop": true,
"primop_meta": {
"name": "catAttrs",
"args": ["attr", "list"],
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"content": "\nCollect each attribute named `attr` from a list of attribute\nsets. Sets that don't contain the named attribute are ignored.\n\n# Example\n\n```nix\ncatAttrs \"a\" [{a = 1;} {b = 0;} {a = 2;}]\n=> [1 2]\n```\n\n# Type\n\n```\ncatAttrs :: String -> [AttrSet] -> [Any]\n```\n",
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"meta": {
"title": "lib.attrsets.chooseDevOutputs",
"path": ["lib", "attrsets", "chooseDevOutputs"],
"aliases": [["lib", "chooseDevOutputs"]],
"signature": "chooseDevOutputs :: [Derivation] -> [String]\n",
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"path": ["lib", "attrsets", "chooseDevOutputs"],
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"content": "\nPick the outputs of packages to place in `buildInputs`\n\n# Type\n\n```\nchooseDevOutputs :: [Derivation] -> [String]\n```\n\n# Arguments\n\n- [drvs] List of packages to pick `dev` outputs from\n\n",
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"content": "\nRecursively collect sets that verify a given predicate named `pred`\nfrom the set `attrs`. The recursion is stopped when the predicate is\nverified.\n\n# Example\n\n```nix\ncollect isList { a = { b = [\"b\"]; }; c = [1]; }\n=> [[\"b\"] [1]]\ncollect (x: x ? outPath)\n { a = { outPath = \"a/\"; }; b = { outPath = \"b/\"; }; }\n=> [{ outPath = \"a/\"; } { outPath = \"b/\"; }]\n```\n\n# Type\n\n```\ncollect :: (AttrSet -> Bool) -> AttrSet -> [x]\n```\n\n# Arguments\n\n- [pred] Given an attribute's value, determine if recursion should stop.\n- [attrs] The attribute set to recursively collect.\n\n",
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"content": "\nMap each attribute in the given set and merge them into a new attribute set.\n\n# Example\n\n```nix\nconcatMapAttrs\n (name: value: {\n ${name} = value;\n ${name + value} = value;\n })\n { x = \"a\"; y = \"b\"; }\n=> { x = \"a\"; xa = \"a\"; y = \"b\"; yb = \"b\"; }\n```\n\n# Type\n\n```\nconcatMapAttrs :: (String -> a -> AttrSet) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [f] \n- [v] \n\n",
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"path": ["lib", "attrsets", "concatMapAttrs"],
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"meta": {
"title": "lib.attrsets.dontRecurseIntoAttrs",
"path": ["lib", "attrsets", "dontRecurseIntoAttrs"],
"aliases": [
["lib", "dontRecurseIntoAttrs"],
["pkgs", "dontRecurseIntoAttrs"]
],
"signature": "dontRecurseIntoAttrs :: AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "attrsets", "dontRecurseIntoAttrs"],
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"content": {
"content": "\nUndo the effect of recurseIntoAttrs.\n\n# Type\n\n```\ndontRecurseIntoAttrs :: AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [attrs] An attribute set to not scan for derivations.\n\n",
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"meta": {
"title": "lib.attrsets.filterAttrs",
"path": ["lib", "attrsets", "filterAttrs"],
"aliases": [["lib", "filterAttrs"]],
"signature": "filterAttrs :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n",
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"path": ["lib", "attrsets", "filterAttrs"],
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"content": {
"content": "\nFilter an attribute set by removing all attributes for which the\ngiven predicate return false.\n\n# Example\n\n```nix\nfilterAttrs (n: v: n == \"foo\") { foo = 1; bar = 2; }\n=> { foo = 1; }\n```\n\n# Type\n\n```\nfilterAttrs :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [pred] Predicate taking an attribute name and an attribute value, which returns `true` to include the attribute, or `false` to exclude the attribute.\n- [set] The attribute set to filter\n\n",
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"meta": {
"title": "lib.attrsets.filterAttrsRecursive",
"path": ["lib", "attrsets", "filterAttrsRecursive"],
"aliases": [["lib", "filterAttrsRecursive"]],
"signature": "filterAttrsRecursive :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n",
"is_primop": false,
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"attr_position": {
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"path": ["lib", "attrsets", "filterAttrsRecursive"],
"pos_type": "Attribute"
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"content": {
"content": "\nFilter an attribute set recursively by removing all attributes for\nwhich the given predicate return false.\n\n# Example\n\n```nix\nfilterAttrsRecursive (n: v: v != null) { foo = { bar = null; }; }\n=> { foo = {}; }\n```\n\n# Type\n\n```\nfilterAttrsRecursive :: (String -> Any -> Bool) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [pred] Predicate taking an attribute name and an attribute value, which returns `true` to include the attribute, or `false` to exclude the attribute.\n- [set] The attribute set to filter\n\n",
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"meta": {
"title": "lib.attrsets.foldAttrs",
"path": ["lib", "attrsets", "foldAttrs"],
"aliases": [["lib", "foldAttrs"]],
"signature": "foldAttrs :: (Any -> Any -> Any) -> Any -> [AttrSets] -> Any\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "attrsets", "foldAttrs"],
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"content": {
"content": "\nApply fold functions to values grouped by key.\n\n# Example\n\n```nix\nfoldAttrs (item: acc: [item] ++ acc) [] [{ a = 2; } { a = 3; }]\n=> { a = [ 2 3 ]; }\n```\n\n# Type\n\n```\nfoldAttrs :: (Any -> Any -> Any) -> Any -> [AttrSets] -> Any\n```\n\n# Arguments\n\n- [op] A function, given a value and a collector combines the two.\n- [nul] The starting value.\n- [list_of_attrs] A list of attribute sets to fold together by key.\n\n",
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"path": ["lib", "attrsets", "foldAttrs"],
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"meta": {
"title": "lib.attrsets.foldlAttrs",
"path": ["lib", "attrsets", "foldlAttrs"],
"aliases": [["lib", "foldlAttrs"]],
"signature": "foldlAttrs :: ( a -> String -> b -> a ) -> a -> { ... :: b } -> a\n",
"is_primop": false,
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"attr_position": {
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"path": ["lib", "attrsets", "foldlAttrs"],
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"content": {
"content": "\nLike [`lib.lists.foldl'`](#function-library-lib.lists.foldl-prime) but for attribute sets.\nIterates over every name-value pair in the given attribute set.\nThe result of the callback function is often called `acc` for accumulator. It is passed between callbacks from left to right and the final `acc` is the return value of `foldlAttrs`.\nAttention:\nThere is a completely different function\n`lib.foldAttrs`\nwhich has nothing to do with this function, despite the similar name.\n\n# Example\n\n```nix\nfoldlAttrs\n (acc: name: value: {\n sum = acc.sum + value;\n names = acc.names ++ [name];\n })\n { sum = 0; names = []; }\n {\n foo = 1;\n bar = 10;\n }\n->\n {\n sum = 11;\n names = [\"bar\" \"foo\"];\n }\nfoldlAttrs\n (throw \"function not needed\")\n 123\n {};\n->\n 123\nfoldlAttrs\n (acc: _: _: acc)\n 3\n { z = throw \"value not needed\"; a = throw \"value not needed\"; };\n->\n 3\nThe accumulator doesn't have to be an attrset.\nIt can be as simple as a number or string.\nfoldlAttrs\n (acc: _: v: acc * 10 + v)\n 1\n { z = 1; a = 2; };\n->\n 121\n```\n\n# Type\n\n```\nfoldlAttrs :: ( a -> String -> b -> a ) -> a -> { ... :: b } -> a\n```\n\n# Arguments\n\n- [f] \n- [init] \n- [set] \n\n",
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"meta": {
"title": "lib.attrsets.genAttrs",
"path": ["lib", "attrsets", "genAttrs"],
"aliases": [["lib", "genAttrs"]],
"signature": "genAttrs :: [ String ] -> (String -> Any) -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
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"content": "\nGenerate an attribute set by mapping a function over a list of\nattribute names.\n\n# Example\n\n```nix\ngenAttrs [ \"foo\" \"bar\" ] (name: \"x_\" + name)\n=> { foo = \"x_foo\"; bar = \"x_bar\"; }\n```\n\n# Type\n\n```\ngenAttrs :: [ String ] -> (String -> Any) -> AttrSet\n```\n\n# Arguments\n\n- [names] Names of values in the resulting attribute set.\n- [f] A function, given the name of the attribute, returns the attribute's value.\n\n",
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"meta": {
"title": "lib.attrsets.getAttr",
"path": ["lib", "attrsets", "getAttr"],
"aliases": [
["builtins", "getAttr"],
["lib", "getAttr"]
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"signature": null,
"is_primop": true,
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"name": "getAttr",
"args": ["s", "set"],
"experimental": false,
"arity": 2
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"content": "\n`getAttr` returns the attribute named *s* from *set*. Evaluation\naborts if the attribute doesn’t exist. This is a dynamic version of\nthe `.` operator, since *s* is an expression rather than an\nidentifier.\n",
"source": {
"position": null,
"path": ["lib", "attrsets", "getAttr"],
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"meta": {
"title": "lib.attrsets.getAttrFromPath",
"path": ["lib", "attrsets", "getAttrFromPath"],
"aliases": [["lib", "getAttrFromPath"]],
"signature": "getAttrFromPath :: [String] -> AttrSet -> Any\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nLike `attrByPath`, but without a default value. If it doesn't find the\npath it will throw an error.\n\n# Example\n\n```nix\nx = { a = { b = 3; }; }\ngetAttrFromPath [\"a\" \"b\"] x\n=> 3\ngetAttrFromPath [\"z\" \"z\"] x\n=> error: cannot find attribute `z.z'\n```\n\n# Type\n\n```\ngetAttrFromPath :: [String] -> AttrSet -> Any\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to get from `set`\n- [set] The nested attribute set to find the value in.\n\n",
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"meta": {
"title": "lib.attrsets.getAttrs",
"path": ["lib", "attrsets", "getAttrs"],
"aliases": [["lib", "getAttrs"]],
"signature": "getAttrs :: [String] -> AttrSet -> AttrSet\n",
"is_primop": false,
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"content": "\nGiven a set of attribute names, return the set of the corresponding\nattributes from the given set.\n\n# Example\n\n```nix\ngetAttrs [ \"a\" \"b\" ] { a = 1; b = 2; c = 3; }\n=> { a = 1; b = 2; }\n```\n\n# Type\n\n```\ngetAttrs :: [String] -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [names] A list of attribute names to get out of `set`\n- [attrs] The set to get the named attributes from\n\n",
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"meta": {
"title": "lib.attrsets.getBin",
"path": ["lib", "attrsets", "getBin"],
"aliases": [["lib", "getBin"]],
"signature": "getBin :: Derivation -> String\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "attrsets", "getBin"],
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"content": {
"content": "\nGet a package's `bin` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetBin pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r\"\n```\n\n# Type\n\n```\ngetBin :: Derivation -> String\n```\n",
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"title": "lib.attrsets.getDev",
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"aliases": [["lib", "getDev"]],
"signature": "getDev :: Derivation -> String\n",
"is_primop": false,
"primop_meta": null,
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"content": "\nGet a package's `dev` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetDev pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev\"\n```\n\n# Type\n\n```\ngetDev :: Derivation -> String\n```\n",
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"aliases": [["lib", "getLib"]],
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"is_primop": false,
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"content": "\nGet a package's `lib` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetLib pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-lib\"\n```\n\n# Type\n\n```\ngetLib :: Derivation -> String\n```\n",
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"content": "\nGet a package's `man` output.\nIf the output does not exist, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetMan pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-man\"\n```\n\n# Type\n\n```\ngetMan :: Derivation -> String\n```\n",
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"content": "\nGet a package output.\nIf no output is found, fallback to `.out` and then to the default.\n\n# Example\n\n```nix\ngetOutput \"dev\" pkgs.openssl\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev\"\n```\n\n# Type\n\n```\ngetOutput :: String -> Derivation -> String\n```\n\n# Arguments\n\n- [output] \n- [pkg] \n\n",
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"content": "\nReturn if an attribute from nested attribute set exists.\n\n# Example\n\n```nix\nx = { a = { b = 3; }; }\nhasAttrByPath [\"a\" \"b\"] x\n=> true\nhasAttrByPath [\"z\" \"z\"] x\n=> false\n```\n\n# Type\n\n```\nhasAttrByPath :: [String] -> AttrSet -> Bool\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to check from `set`\n- [e] The nested attribute set to check\n\n",
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"content": "\nReturn `true` if *e* evaluates to a set, and `false` otherwise.\n",
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"content": "\nCheck whether the argument is a derivation. Any set with\n`{ type = \"derivation\"; }` counts as a derivation.\n\n# Example\n\n```nix\nnixpkgs = import <nixpkgs> {}\nisDerivation nixpkgs.ruby\n=> true\nisDerivation \"foobar\"\n=> false\n```\n\n# Type\n\n```\nisDerivation :: Any -> Bool\n```\n\n# Arguments\n\n- [value] Value to check.\n\n",
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"content": "\nConstruct a set from a list specifying the names and values of each\nattribute. Each element of the list should be a set consisting of a\nstring-valued attribute `name` specifying the name of the attribute,\nand an attribute `value` specifying its value.\n\nIn case of duplicate occurrences of the same name, the first\ntakes precedence.\n\nExample:\n\n```nix\nbuiltins.listToAttrs\n [ { name = \"foo\"; value = 123; }\n { name = \"bar\"; value = 456; }\n { name = \"bar\"; value = 420; }\n ]\n```\n\nevaluates to\n\n```nix\n{ foo = 123; bar = 456; }\n```\n",
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"content": "\nApply a function to each element in an attribute set, creating a new attribute set.\n\n# Example\n\n```nix\nmapAttrs (name: value: name + \"-\" + value)\n { x = \"foo\"; y = \"bar\"; }\n=> { x = \"x-foo\"; y = \"y-bar\"; }\n```\n\n# Type\n\n```\nmapAttrs :: (String -> Any -> Any) -> AttrSet -> AttrSet\n```\n",
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"content": "\nLike `mapAttrs`, but allows the name of each attribute to be\nchanged in addition to the value. The applied function should\nreturn both the new name and value as a `nameValuePair`.\n\n# Example\n\n```nix\nmapAttrs' (name: value: nameValuePair (\"foo_\" + name) (\"bar-\" + value))\n { x = \"a\"; y = \"b\"; }\n=> { foo_x = \"bar-a\"; foo_y = \"bar-b\"; }\n```\n\n# Type\n\n```\nmapAttrs' :: (String -> Any -> { name :: String; value :: Any; }) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [f] A function, given an attribute's name and value, returns a new `nameValuePair`.\n- [set] Attribute set to map over.\n\n",
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"content": "\nLike `mapAttrs`, except that it recursively applies itself to\nthe *leaf* attributes of a potentially-nested attribute set:\nthe second argument of the function will never be an attrset.\nAlso, the first argument of the argument function is a *list*\nof the attribute names that form the path to the leaf attribute.\nFor a function that gives you control over what counts as a leaf,\nsee `mapAttrsRecursiveCond`.\n\n# Example\n\n```nix\nmapAttrsRecursive (path: value: concatStringsSep \"-\" (path ++ [value]))\n { n = { a = \"A\"; m = { b = \"B\"; c = \"C\"; }; }; d = \"D\"; }\n=> { n = { a = \"n-a-A\"; m = { b = \"n-m-b-B\"; c = \"n-m-c-C\"; }; }; d = \"d-D\"; }\n```\n\n# Type\n\n```\nmapAttrsRecursive :: ([String] -> a -> b) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [f] A function, given a list of attribute names and a value, returns a new value.\n- [set] Set to recursively map over.\n\n",
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"content": "\nLike `mapAttrsRecursive`, but it takes an additional predicate\nfunction that tells it whether to recurse into an attribute\nset. If it returns false, `mapAttrsRecursiveCond` does not\nrecurse, but does apply the map function. If it returns true, it\ndoes recurse, and does not apply the map function.\n\n# Example\n\n```nix\n# To prevent recursing into derivations (which are attribute\n# sets with the attribute \"type\" equal to \"derivation\"):\nmapAttrsRecursiveCond\n (as: !(as ? \"type\" && as.type == \"derivation\"))\n (x: ... do something ...)\n attrs\n```\n\n# Type\n\n```\nmapAttrsRecursiveCond :: (AttrSet -> Bool) -> ([String] -> a -> b) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [cond] A function, given the attribute set the recursion is currently at, determine if to recurse deeper into that attribute set.\n- [f] A function, given a list of attribute names and a value, returns a new value.\n- [set] Attribute set to recursively map over.\n\n",
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"content": "\nMerge a list of attribute sets together using the `//` operator.\nIn case of duplicate attributes, values from later list elements take precedence over earlier ones.\nThe result is the same as `foldl mergeAttrs { }`, but the performance is better for large inputs.\nFor n list elements, each with an attribute set containing m unique attributes, the complexity of this operation is O(nm log n).\n\n# Example\n\n```nix\nmergeAttrsList [ { a = 0; b = 1; } { c = 2; d = 3; } ]\n=> { a = 0; b = 1; c = 2; d = 3; }\nmergeAttrsList [ { a = 0; } { a = 1; } ]\n=> { a = 1; }\n```\n\n# Type\n\n```\nmergeAttrsList :: [ Attrs ] -> Attrs\n```\n\n# Arguments\n\n- [list] \n\n",
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"path": ["lib", "attrsets", "mergeAttrsList"],
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{
"meta": {
"title": "lib.attrsets.nameValuePair",
"path": ["lib", "attrsets", "nameValuePair"],
"aliases": [["lib", "nameValuePair"]],
"signature": "nameValuePair :: String -> Any -> { name :: String; value :: Any; }\n",
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"primop_meta": null,
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"path": ["lib", "attrsets", "nameValuePair"],
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"content": {
"content": "\nUtility function that creates a `{name, value}` pair as expected by `builtins.listToAttrs`.\n\n# Example\n\n```nix\nnameValuePair \"some\" 6\n=> { name = \"some\"; value = 6; }\n```\n\n# Type\n\n```\nnameValuePair :: String -> Any -> { name :: String; value :: Any; }\n```\n\n# Arguments\n\n- [name] Attribute name\n- [value] Attribute value\n\n",
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"path": ["lib", "attrsets", "nameValuePair"],
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"meta": {
"title": "lib.attrsets.optionalAttrs",
"path": ["lib", "attrsets", "optionalAttrs"],
"aliases": [["lib", "optionalAttrs"]],
"signature": "optionalAttrs :: Bool -> AttrSet -> AttrSet\n",
"is_primop": false,
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"content": {
"content": "\nIf `cond` is true, return the attribute set `as`,\notherwise an empty attribute set.\n\n# Example\n\n```nix\noptionalAttrs (true) { my = \"set\"; }\n=> { my = \"set\"; }\noptionalAttrs (false) { my = \"set\"; }\n=> { }\n```\n\n# Type\n\n```\noptionalAttrs :: Bool -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [cond] Condition under which the `as` attribute set is returned.\n- [as] The attribute set to return if `cond` is `true`.\n\n",
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{
"meta": {
"title": "lib.attrsets.overrideExisting",
"path": ["lib", "attrsets", "overrideExisting"],
"aliases": [["lib", "overrideExisting"]],
"signature": "overrideExisting :: AttrSet -> AttrSet -> AttrSet\n",
"is_primop": false,
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"path": ["lib", "attrsets", "overrideExisting"],
"pos_type": "Attribute"
}
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"content": {
"content": "\nOverride only the attributes that are already present in the old set\nuseful for deep-overriding.\n\n# Example\n\n```nix\noverrideExisting {} { a = 1; }\n=> {}\noverrideExisting { b = 2; } { a = 1; }\n=> { b = 2; }\noverrideExisting { a = 3; b = 2; } { a = 1; }\n=> { a = 1; b = 2; }\n```\n\n# Type\n\n```\noverrideExisting :: AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [old] Original attribute set\n- [new] Attribute set with attributes to override in `old`.\n\n",
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{
"meta": {
"title": "lib.attrsets.recurseIntoAttrs",
"path": ["lib", "attrsets", "recurseIntoAttrs"],
"aliases": [
["lib", "recurseIntoAttrs"],
["pkgs", "recurseIntoAttrs"]
],
"signature": "recurseIntoAttrs :: AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "attrsets", "recurseIntoAttrs"],
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"content": {
"content": "\nMake various Nix tools consider the contents of the resulting\nattribute set when looking for what to build, find, etc.\nThis function only affects a single attribute set; it does not\napply itself recursively for nested attribute sets.\n\n# Example\n\n```nix\n{ pkgs ? import <nixpkgs> {} }:\n{\n myTools = pkgs.lib.recurseIntoAttrs {\n inherit (pkgs) hello figlet;\n };\n}\n```\n\n# Type\n\n```\nrecurseIntoAttrs :: AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [attrs] An attribute set to scan for derivations.\n\n",
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"path": ["lib", "attrsets", "recurseIntoAttrs"],
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"meta": {
"title": "lib.attrsets.recursiveUpdate",
"path": ["lib", "attrsets", "recursiveUpdate"],
"aliases": [["lib", "recursiveUpdate"]],
"signature": "recursiveUpdate :: AttrSet -> AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "attrsets", "recursiveUpdate"],
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"content": {
"content": "\nA recursive variant of the update operator ‘//’. The recursion\nstops when one of the attribute values is not an attribute set,\nin which case the right hand side value takes precedence over the\nleft hand side value.\n\n# Example\n\n```nix\nrecursiveUpdate {\n boot.loader.grub.enable = true;\n boot.loader.grub.device = \"/dev/hda\";\n} {\n boot.loader.grub.device = \"\";\n}\nreturns: {\n boot.loader.grub.enable = true;\n boot.loader.grub.device = \"\";\n}\n```\n\n# Type\n\n```\nrecursiveUpdate :: AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [lhs] Left attribute set of the merge.\n- [rhs] Right attribute set of the merge.\n\n",
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"path": ["lib", "attrsets", "recursiveUpdate"],
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{
"meta": {
"title": "lib.attrsets.recursiveUpdateUntil",
"path": ["lib", "attrsets", "recursiveUpdateUntil"],
"aliases": [["lib", "recursiveUpdateUntil"]],
"signature": "recursiveUpdateUntil :: ( [ String ] -> AttrSet -> AttrSet -> Bool ) -> AttrSet -> AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "attrsets", "recursiveUpdateUntil"],
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"content": {
"content": "\nDoes the same as the update operator '//' except that attributes are\nmerged until the given predicate is verified. The predicate should\naccept 3 arguments which are the path to reach the attribute, a part of\nthe first attribute set and a part of the second attribute set. When\nthe predicate is satisfied, the value of the first attribute set is\nreplaced by the value of the second attribute set.\n\n# Example\n\n```nix\nrecursiveUpdateUntil (path: l: r: path == [\"foo\"]) {\n # first attribute set\n foo.bar = 1;\n foo.baz = 2;\n bar = 3;\n} {\n #second attribute set\n foo.bar = 1;\n foo.quz = 2;\n baz = 4;\n}\n=> {\n foo.bar = 1; # 'foo.*' from the second set\n foo.quz = 2; #\n bar = 3; # 'bar' from the first set\n baz = 4; # 'baz' from the second set\n}\n```\n\n# Type\n\n```\nrecursiveUpdateUntil :: ( [ String ] -> AttrSet -> AttrSet -> Bool ) -> AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [pred] Predicate, taking the path to the current attribute as a list of strings for attribute names, and the two values at that path from the original arguments.\n- [lhs] Left attribute set of the merge.\n- [rhs] Right attribute set of the merge.\n\n",
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"path": ["lib", "attrsets", "recursiveUpdateUntil"],
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{
"meta": {
"title": "lib.attrsets.removeAttrs",
"path": ["lib", "attrsets", "removeAttrs"],
"aliases": [["builtins", "removeAttrs"]],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "removeAttrs",
"args": ["set", "list"],
"experimental": false,
"arity": 2
},
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"content": "\nRemove the attributes listed in *list* from *set*. The attributes\ndon’t have to exist in *set*. For instance,\n\n```nix\nremoveAttrs { x = 1; y = 2; z = 3; } [ \"a\" \"x\" \"z\" ]\n```\n\nevaluates to `{ y = 2; }`.\n",
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"meta": {
"title": "lib.attrsets.setAttrByPath",
"path": ["lib", "attrsets", "setAttrByPath"],
"aliases": [["lib", "setAttrByPath"]],
"signature": "setAttrByPath :: [String] -> Any -> AttrSet\n",
"is_primop": false,
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"path": ["lib", "attrsets", "setAttrByPath"],
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"content": "\nCreate a new attribute set with `value` set at the nested attribute location specified in `attrPath`.\n\n# Example\n\n```nix\nsetAttrByPath [\"a\" \"b\"] 3\n=> { a = { b = 3; }; }\n```\n\n# Type\n\n```\nsetAttrByPath :: [String] -> Any -> AttrSet\n```\n\n# Arguments\n\n- [attrPath] A list of strings representing the attribute path to set\n- [value] The value to set at the location described by `attrPath`\n\n",
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"path": ["lib", "attrsets", "setAttrByPath"],
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"meta": {
"title": "lib.attrsets.showAttrPath",
"path": ["lib", "attrsets", "showAttrPath"],
"aliases": [["lib", "showAttrPath"]],
"signature": "showAttrPath :: [String] -> String\n",
"is_primop": false,
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"path": ["lib", "attrsets", "showAttrPath"],
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"content": "\nTurns a list of strings into a human-readable description of those\nstrings represented as an attribute path. The result of this function is\nnot intended to be machine-readable.\nCreate a new attribute set with `value` set at the nested attribute location specified in `attrPath`.\n\n# Example\n\n```nix\nshowAttrPath [ \"foo\" \"10\" \"bar\" ]\n=> \"foo.\\\"10\\\".bar\"\nshowAttrPath []\n=> \"<root attribute path>\"\n```\n\n# Type\n\n```\nshowAttrPath :: [String] -> String\n```\n\n# Arguments\n\n- [path] Attribute path to render to a string\n\n",
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"meta": {
"title": "lib.attrsets.toDerivation",
"path": ["lib", "attrsets", "toDerivation"],
"aliases": [["lib", "toDerivation"]],
"signature": "toDerivation :: Path -> Derivation\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"path": ["lib", "attrsets", "toDerivation"],
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"content": {
"content": "\nConverts a store path to a fake derivation.\n\n# Type\n\n```\ntoDerivation :: Path -> Derivation\n```\n\n# Arguments\n\n- [path] A store path to convert to a derivation.\n\n",
"source": {
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"meta": {
"title": "lib.attrsets.unionOfDisjoint",
"path": ["lib", "attrsets", "unionOfDisjoint"],
"aliases": [],
"signature": "unionOfDisjoint :: AttrSet -> AttrSet -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
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"content": "\n`unionOfDisjoint x y` is equal to `x // y // z` where the\nattrnames in `z` are the intersection of the attrnames in `x` and\n`y`, and all values `assert` with an error message. This\noperator is commutative, unlike (//).\n\n# Type\n\n```\nunionOfDisjoint :: AttrSet -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"meta": {
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"path": ["lib", "attrsets", "updateManyAttrsByPath"],
"aliases": [["lib", "updateManyAttrsByPath"]],
"signature": "updateManyAttrsByPath :: [{ path :: [String]; update :: (Any -> Any); }] -> AttrSet -> AttrSet\n",
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"primop_meta": null,
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"content": "\nUpdate or set specific paths of an attribute set.\nTakes a list of updates to apply and an attribute set to apply them to,\nand returns the attribute set with the updates applied. Updates are\nrepresented as `{ path = ...; update = ...; }` values, where `path` is a\nlist of strings representing the attribute path that should be updated,\nand `update` is a function that takes the old value at that attribute path\nas an argument and returns the new\nvalue it should be.\nProperties:\n- Updates to deeper attribute paths are applied before updates to more\nshallow attribute paths\n- Multiple updates to the same attribute path are applied in the order\nthey appear in the update list\n- If any but the last `path` element leads into a value that is not an\nattribute set, an error is thrown\n- If there is an update for an attribute path that doesn't exist,\naccessing the argument in the update function causes an error, but\nintermediate attribute sets are implicitly created as needed\n\n# Example\n\n```nix\nupdateManyAttrsByPath [\n {\n path = [ \"a\" \"b\" ];\n update = old: { d = old.c; };\n }\n {\n path = [ \"a\" \"b\" \"c\" ];\n update = old: old + 1;\n }\n {\n path = [ \"x\" \"y\" ];\n update = old: \"xy\";\n }\n] { a.b.c = 0; }\n=> { a = { b = { d = 1; }; }; x = { y = \"xy\"; }; }\n```\n\n# Type\n\n```\nupdateManyAttrsByPath :: [{ path :: [String]; update :: (Any -> Any); }] -> AttrSet -> AttrSet\n```\n",
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"content": {
"content": "\nMerge sets of attributes and use the function f to merge attribute values.\nLike `lib.attrsets.zipAttrsWithNames` with all key names are passed for `names`.\nImplementation note: Common names appear multiple times in the list of\nnames, hopefully this does not affect the system because the maximal\nlaziness avoid computing twice the same expression and `listToAttrs` does\nnot care about duplicated attribute names.\n\n# Example\n\n```nix\nzipAttrsWith (name: values: values) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; b = [\"z\"]; }\n```\n\n# Type\n\n```\nzipAttrsWith :: (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n",
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"title": "lib.attrsets.zipAttrs",
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"aliases": [["lib", "zipAttrs"]],
"signature": "zipAttrs :: [ AttrSet ] -> AttrSet\n",
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"content": "\nMerge sets of attributes and combine each attribute value in to a list.\nLike `lib.attrsets.zipAttrsWith` with `(name: values: values)` as the function.\n\n# Example\n\n```nix\nzipAttrs [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; b = [\"z\"]; }\n```\n\n# Type\n\n```\nzipAttrs :: [ AttrSet ] -> AttrSet\n```\n\n# Arguments\n\n- [sets] List of attribute sets to zip together.\n\n",
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"content": "\nMerge sets of attributes and use the function f to merge attribute values.\nLike `lib.attrsets.zipAttrsWithNames` with all key names are passed for `names`.\nImplementation note: Common names appear multiple times in the list of\nnames, hopefully this does not affect the system because the maximal\nlaziness avoid computing twice the same expression and `listToAttrs` does\nnot care about duplicated attribute names.\n\n# Example\n\n```nix\nzipAttrsWith (name: values: values) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; b = [\"z\"]; }\n```\n\n# Type\n\n```\nzipAttrsWith :: (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n",
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"content": "\nMerge sets of attributes and use the function `f` to merge attributes\nvalues.\n\n# Example\n\n```nix\nzipAttrsWithNames [\"a\"] (name: vs: vs) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; }\n```\n\n# Type\n\n```\nzipAttrsWithNames :: [ String ] -> (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n\n# Arguments\n\n- [names] List of attribute names to zip.\n- [f] A function, accepts an attribute name, all the values, and returns a combined value.\n- [sets] List of values from the list of attribute sets.\n\n",
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"content": "\nMerge sets of attributes and use the function `f` to merge attributes\nvalues.\n\n# Example\n\n```nix\nzipAttrsWithNames [\"a\"] (name: vs: vs) [{a = \"x\";} {a = \"y\"; b = \"z\";}]\n=> { a = [\"x\" \"y\"]; }\n```\n\n# Type\n\n```\nzipAttrsWithNames :: [ String ] -> (String -> [ Any ] -> Any) -> [ AttrSet ] -> AttrSet\n```\n\n# Arguments\n\n- [names] List of attribute names to zip.\n- [f] A function, accepts an attribute name, all the values, and returns a combined value.\n- [sets] List of values from the list of attribute sets.\n\n",
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"title": "lib.cli.toGNUCommandLine",
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"signature": null,
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"content": "\nAutomatically convert an attribute set to command-line options.\nThis helps protect against malformed command lines and also to reduce\nboilerplate related to command-line construction for simple use cases.\n`toGNUCommandLine` returns a list of nix strings.\n`toGNUCommandLineShell` returns an escaped shell string.\n\n# Example\n\n```nix\ncli.toGNUCommandLine {} {\n data = builtins.toJSON { id = 0; };\n X = \"PUT\";\n retry = 3;\n retry-delay = null;\n url = [ \"https://example.com/foo\" \"https://example.com/bar\" ];\n silent = false;\n verbose = true;\n}\n=> [\n \"-X\" \"PUT\"\n \"--data\" \"{\\\"id\\\":0}\"\n \"--retry\" \"3\"\n \"--url\" \"https://example.com/foo\"\n \"--url\" \"https://example.com/bar\"\n \"--verbose\"\n]\ncli.toGNUCommandLineShell {} {\n data = builtins.toJSON { id = 0; };\n X = \"PUT\";\n retry = 3;\n retry-delay = null;\n url = [ \"https://example.com/foo\" \"https://example.com/bar\" ];\n silent = false;\n verbose = true;\n}\n=> \"'-X' 'PUT' '--data' '{\\\"id\\\":0}' '--retry' '3' '--url' 'https://example.com/foo' '--url' 'https://example.com/bar' '--verbose'\";\n```\n\n# Arguments\n\n- [options] \n- [attrs] \n\n",
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"meta": {
"title": "lib.customisation.callPackageWith",
"path": ["lib", "customisation", "callPackageWith"],
"aliases": [["lib", "callPackageWith"]],
"signature": "callPackageWith :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n",
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"content": "\nCall the package function in the file `fn` with the required\narguments automatically. The function is called with the\narguments `args`, but any missing arguments are obtained from\n`autoArgs`. This function is intended to be partially\nparameterised, e.g.,\n```nix\ncallPackage = callPackageWith pkgs;\npkgs = {\nlibfoo = callPackage ./foo.nix { };\nlibbar = callPackage ./bar.nix { };\n};\n```\nIf the `libbar` function expects an argument named `libfoo`, it is\nautomatically passed as an argument. Overrides or missing\narguments can be supplied in `args`, e.g.\n```nix\nlibbar = callPackage ./bar.nix {\nlibfoo = null;\nenableX11 = true;\n};\n```\n<!-- TODO: Apply \"Example:\" tag to the examples above -->\n\n# Type\n\n```\ncallPackageWith :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n```\n\n# Arguments\n\n- [autoArgs] \n- [fn] \n- [args] \n\n",
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"title": "lib.customisation.callPackagesWith",
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"signature": "callPackagesWith :: AttrSet -> ((AttrSet -> AttrSet) | Path) -> AttrSet -> AttrSet\n",
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"content": "\nLike callPackage, but for a function that returns an attribute\nset of derivations. The override function is added to the\nindividual attributes.\n\n# Type\n\n```\ncallPackagesWith :: AttrSet -> ((AttrSet -> AttrSet) | Path) -> AttrSet -> AttrSet\n```\n\n# Arguments\n\n- [autoArgs] \n- [fn] \n- [args] \n\n",
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"title": "lib.customisation.extendDerivation",
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"aliases": [["lib", "extendDerivation"]],
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"content": {
"content": "\nAdd attributes to each output of a derivation without changing\nthe derivation itself and check a given condition when evaluating.\n\n# Type\n\n```\nextendDerivation :: Bool -> Any -> Derivation -> Derivation\n```\n\n# Arguments\n\n- [condition] \n- [passthru] \n- [drv] \n\n",
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"content": "\nStrip a derivation of all non-essential attributes, returning\nonly those needed by hydra-eval-jobs. Also strictly evaluate the\nresult to ensure that there are no thunks kept alive to prevent\ngarbage collection.\n\n# Type\n\n```\nhydraJob :: (Derivation | Null) -> (Derivation | Null)\n```\n\n# Arguments\n\n- [drv] \n\n",
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"content": "\n`makeOverridable` takes a function from attribute set to attribute set and\ninjects `override` attribute which can be used to override arguments of\nthe function.\nPlease refer to documentation on [`<pkg>.overrideDerivation`](#sec-pkg-overrideDerivation) to learn about `overrideDerivation` and caveats\nrelated to its use.\n\n# Example\n\n```nix\nnix-repl> x = {a, b}: { result = a + b; }\nnix-repl> y = lib.makeOverridable x { a = 1; b = 2; }\nnix-repl> y\n{ override = «lambda»; overrideDerivation = «lambda»; result = 3; }\nnix-repl> y.override { a = 10; }\n{ override = «lambda»; overrideDerivation = «lambda»; result = 12; }\n```\n\n# Type\n\n```\nmakeOverridable :: (AttrSet -> a) -> AttrSet -> a\n```\n\n# Arguments\n\n- [f] \n\n",
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"title": "lib.customisation.makeScope",
"path": ["lib", "customisation", "makeScope"],
"aliases": [["lib", "makeScope"]],
"signature": "makeScope :: (AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a) -> (AttrSet -> AttrSet) -> AttrSet\n",
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"content": "\nMake a set of packages with a common scope. All packages called\nwith the provided `callPackage` will be evaluated with the same\narguments. Any package in the set may depend on any other. The\n`overrideScope'` function allows subsequent modification of the package\nset in a consistent way, i.e. all packages in the set will be\ncalled with the overridden packages. The package sets may be\nhierarchical: the packages in the set are called with the scope\nprovided by `newScope` and the set provides a `newScope` attribute\nwhich can form the parent scope for later package sets.\n\n# Type\n\n```\nmakeScope :: (AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a) -> (AttrSet -> AttrSet) -> AttrSet\n```\n\n# Arguments\n\n- [newScope] \n- [f] \n\n",
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"meta": {
"title": "lib.customisation.makeScopeWithSplicing",
"path": ["lib", "customisation", "makeScopeWithSplicing"],
"aliases": [
["lib", "makeScopeWithSplicing"],
["pkgs", "makeScopeWithSplicing"]
],
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"path": ["lib", "customisation", "makeScopeWithSplicing"],
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"content": {
"content": "\nbackward compatibility with old uncurried form; deprecated\n\n# Arguments\n\n- [splicePackages] \n- [newScope] \n- [otherSplices] \n- [keep] \n- [extra] \n- [f] \n\n",
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"meta": {
"title": "lib.customisation.makeScopeWithSplicing' (Prime)",
"path": ["lib", "customisation", "makeScopeWithSplicing'"],
"aliases": [
["lib", "makeScopeWithSplicing'"],
["pkgs", "makeScopeWithSplicing'"]
],
"signature": "makeScopeWithSplicing' ::\n { splicePackages :: Splice -> AttrSet\n , newScope :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n }\n -> { otherSplices :: Splice, keep :: AttrSet -> AttrSet, extra :: AttrSet -> AttrSet }\n -> AttrSet\nSplice ::\n { pkgsBuildBuild :: AttrSet\n , pkgsBuildHost :: AttrSet\n , pkgsBuildTarget :: AttrSet\n , pkgsHostHost :: AttrSet\n , pkgsHostTarget :: AttrSet\n , pkgsTargetTarget :: AttrSet\n }\n",
"is_primop": false,
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/customisation.nix",
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"lambda_position": {
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"path": ["lib", "customisation", "makeScopeWithSplicing'"],
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"content": {
"content": "\nLike makeScope, but aims to support cross compilation. It's still ugly, but\nhopefully it helps a little bit.\n\n# Type\n\n```\nmakeScopeWithSplicing' ::\n { splicePackages :: Splice -> AttrSet\n , newScope :: AttrSet -> ((AttrSet -> a) | Path) -> AttrSet -> a\n }\n -> { otherSplices :: Splice, keep :: AttrSet -> AttrSet, extra :: AttrSet -> AttrSet }\n -> AttrSet\nSplice ::\n { pkgsBuildBuild :: AttrSet\n , pkgsBuildHost :: AttrSet\n , pkgsBuildTarget :: AttrSet\n , pkgsHostHost :: AttrSet\n , pkgsHostTarget :: AttrSet\n , pkgsTargetTarget :: AttrSet\n }\n```\n\n# Arguments\n\n\n",
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"meta": {
"title": "lib.customisation.overrideDerivation",
"path": ["lib", "customisation", "overrideDerivation"],
"aliases": [
["pkgs", "dockerTools", "overrideDerivation"],
["lib", "overrideDerivation"],
["pkgs", "pythonPackages", "overrideDerivation"],
["pkgs", "stdenv", "overrideDerivation"],
["pkgs", "writers", "overrideDerivation"]
],
"signature": "overrideDerivation :: Derivation -> ( Derivation -> AttrSet ) -> Derivation\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\n`overrideDerivation drv f` takes a derivation (i.e., the result\nof a call to the builtin function `derivation`) and returns a new\nderivation in which the attributes of the original are overridden\naccording to the function `f`. The function `f` is called with\nthe original derivation attributes.\n`overrideDerivation` allows certain \"ad-hoc\" customisation\nscenarios (e.g. in ~/.config/nixpkgs/config.nix). For instance,\nif you want to \"patch\" the derivation returned by a package\nfunction in Nixpkgs to build another version than what the\nfunction itself provides.\nFor another application, see build-support/vm, where this\nfunction is used to build arbitrary derivations inside a QEMU\nvirtual machine.\nNote that in order to preserve evaluation errors, the new derivation's\noutPath depends on the old one's, which means that this function cannot\nbe used in circular situations when the old derivation also depends on the\nnew one.\nYou should in general prefer `drv.overrideAttrs` over this function;\nsee the nixpkgs manual for more information on overriding.\n\n# Example\n\n```nix\nmySed = overrideDerivation pkgs.gnused (oldAttrs: {\n name = \"sed-4.2.2-pre\";\n src = fetchurl {\n url = ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2;\n hash = \"sha256-MxBJRcM2rYzQYwJ5XKxhXTQByvSg5jZc5cSHEZoB2IY=\";\n };\n patches = [];\n});\n```\n\n# Type\n\n```\noverrideDerivation :: Derivation -> ( Derivation -> AttrSet ) -> Derivation\n```\n\n# Arguments\n\n- [drv] \n- [f] \n\n",
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"meta": {
"title": "lib.debug.runTests",
"path": ["lib", "debug", "runTests"],
"aliases": [["lib", "runTests"]],
"signature": "runTests :: {\n tests = [ String ];\n ${testName} :: {\n expr :: a;\n expected :: a;\n };\n}\n->\n[\n {\n name :: String;\n expected :: a;\n result :: a;\n }\n]\n",
"is_primop": false,
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"path": ["lib", "debug", "runTests"],
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"content": {
"content": "\nEvaluates a set of tests.\nA test is an attribute set `{expr, expected}`,\ndenoting an expression and its expected result.\nThe result is a `list` of __failed tests__, each represented as\n`{name, expected, result}`,\n- expected\n- What was passed as `expected`\n- result\n- The actual `result` of the test\nUsed for regression testing of the functions in lib; see\ntests.nix for more examples.\nImportant: Only attributes that start with `test` are executed.\n- If you want to run only a subset of the tests add the attribute `tests = [\"testName\"];`\n\n# Example\n\n```nix\nrunTests {\n testAndOk = {\n expr = lib.and true false;\n expected = false;\n };\n testAndFail = {\n expr = lib.and true false;\n expected = true;\n };\n}\n->\n[\n {\n name = \"testAndFail\";\n expected = true;\n result = false;\n }\n]\n```\n\n# Type\n\n```\nrunTests :: {\n tests = [ String ];\n ${testName} :: {\n expr :: a;\n expected :: a;\n };\n}\n->\n[\n {\n name :: String;\n expected :: a;\n result :: a;\n }\n]\n```\n\n# Arguments\n\n- [tests] Tests to run\n\n",
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"meta": {
"title": "lib.debug.testAllTrue",
"path": ["lib", "debug", "testAllTrue"],
"aliases": [["lib", "testAllTrue"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/debug.nix",
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"content": "\nCreate a test assuming that list elements are `true`.\n\n# Example\n\n```nix\n{ testX = allTrue [ true ]; }\n```\n\n# Arguments\n\n- [expr] \n\n",
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"meta": {
"title": "lib.debug.traceFnSeqN",
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"aliases": [["lib", "traceFnSeqN"]],
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"content": {
"content": "\nTrace the input and output of a function `f` named `name`,\nboth down to `depth`.\nThis is useful for adding around a function call,\nto see the before/after of values as they are transformed.\n\n# Example\n\n```nix\ntraceFnSeqN 2 \"id\" (x: x) { a.b.c = 3; }\ntrace: { fn = \"id\"; from = { a.b = {…}; }; to = { a.b = {…}; }; }\n=> { a.b.c = 3; }\n```\n\n# Arguments\n\n- [depth] \n- [name] \n- [f] \n- [v] \n\n",
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"meta": {
"title": "lib.debug.traceIf",
"path": ["lib", "debug", "traceIf"],
"aliases": [["lib", "traceIf"]],
"signature": "traceIf :: bool -> string -> a -> a\n",
"is_primop": false,
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"content": "\nConditionally trace the supplied message, based on a predicate.\n\n# Example\n\n```nix\ntraceIf true \"hello\" 3\ntrace: hello\n=> 3\n```\n\n# Type\n\n```\ntraceIf :: bool -> string -> a -> a\n```\n\n# Arguments\n\n- [pred] Predicate to check\n- [msg] Message that should be traced\n- [x] Value to return\n\n",
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"meta": {
"title": "lib.debug.traceSeq",
"path": ["lib", "debug", "traceSeq"],
"aliases": [["lib", "traceSeq"]],
"signature": "traceSeq :: a -> b -> b\n",
"is_primop": false,
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"content": {
"content": "\n`builtins.trace`, but the value is `builtins.deepSeq`ed first.\n\n# Example\n\n```nix\ntrace { a.b.c = 3; } null\ntrace: { a = <CODE>; }\n=> null\ntraceSeq { a.b.c = 3; } null\ntrace: { a = { b = { c = 3; }; }; }\n=> null\n```\n\n# Type\n\n```\ntraceSeq :: a -> b -> b\n```\n\n# Arguments\n\n- [x] The value to trace\n- [y] The value to return\n\n",
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"meta": {
"title": "lib.debug.traceSeqN",
"path": ["lib", "debug", "traceSeqN"],
"aliases": [["lib", "traceSeqN"]],
"signature": "traceSeqN :: Int -> a -> b -> b\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "debug", "traceSeqN"],
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"content": {
"content": "\nLike `traceSeq`, but only evaluate down to depth n.\nThis is very useful because lots of `traceSeq` usages\nlead to an infinite recursion.\n\n# Example\n\n```nix\ntraceSeqN 2 { a.b.c = 3; } null\ntrace: { a = { b = {…}; }; }\n=> null\n```\n\n# Type\n\n```\ntraceSeqN :: Int -> a -> b -> b\n```\n\n# Arguments\n\n- [depth] \n- [x] \n- [y] \n\n",
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"title": "lib.debug.traceVal",
"path": ["lib", "debug", "traceVal"],
"aliases": [
["lib", "fileset", "traceVal"],
["lib", "traceVal"]
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"signature": "traceVal :: a -> a\n",
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"path": ["lib", "debug", "traceVal"],
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"content": {
"content": "\nTrace the supplied value and return it.\n\n# Example\n\n```nix\ntraceVal 42\n# trace: 42\n=> 42\n```\n\n# Type\n\n```\ntraceVal :: a -> a\n```\n",
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"content": "\nTrace the supplied value after applying a function to it, and\nreturn the original value.\n\n# Example\n\n```nix\ntraceValFn (v: \"mystring ${v}\") \"foo\"\ntrace: mystring foo\n=> \"foo\"\n```\n\n# Type\n\n```\ntraceValFn :: (a -> b) -> a -> a\n```\n\n# Arguments\n\n- [f] Function to apply\n- [x] Value to trace and return\n\n",
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"title": "lib.debug.traceValSeq",
"path": ["lib", "debug", "traceValSeq"],
"aliases": [["lib", "traceValSeq"]],
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"content": "\nA combination of `traceVal` and `traceSeq`.\n",
"source": {
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"path": ["lib", "debug", "traceValSeqFn"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeq` that applies a\nprovided function to the value to be traced after `deepSeq`ing\nit.\n\n# Arguments\n\n- [f] Function to apply\n- [v] Value to trace\n\n",
"source": {
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"title": "lib.debug.traceValSeqN",
"path": ["lib", "debug", "traceValSeqN"],
"aliases": [["lib", "traceValSeqN"]],
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"path": ["lib", "debug", "traceValSeqN"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeqN`.\n",
"source": {
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"title": "lib.debug.traceValSeqNFn",
"path": ["lib", "debug", "traceValSeqNFn"],
"aliases": [["lib", "traceValSeqNFn"]],
"signature": null,
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"path": ["lib", "debug", "traceValSeqNFn"],
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"content": {
"content": "\nA combination of `traceVal` and `traceSeqN` that applies a\nprovided function to the value to be traced.\n\n# Arguments\n\n- [f] Function to apply\n- [depth] \n- [v] Value to trace\n\n",
"source": {
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"meta": {
"title": "lib.derivations.lazyDerivation",
"path": ["lib", "derivations", "lazyDerivation"],
"aliases": [["lib", "lazyDerivation"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "derivations", "lazyDerivation"],
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"content": {
"content": "\nRestrict a derivation to a predictable set of attribute names, so\nthat the returned attrset is not strict in the actual derivation,\nsaving a lot of computation when the derivation is non-trivial.\nThis is useful in situations where a derivation might only be used for its\npassthru attributes, improving evaluation performance.\nThe returned attribute set is lazy in `derivation`. Specifically, this\nmeans that the derivation will not be evaluated in at least the\nsituations below.\nFor illustration and/or testing, we define derivation such that its\nevaluation is very noticeable.\nlet derivation = throw \"This won't be evaluated.\";\nIn the following expressions, `derivation` will _not_ be evaluated:\n(lazyDerivation { inherit derivation; }).type\nattrNames (lazyDerivation { inherit derivation; })\n(lazyDerivation { inherit derivation; } // { foo = true; }).foo\n(lazyDerivation { inherit derivation; meta.foo = true; }).meta\nIn these expressions, `derivation` _will_ be evaluated:\n\"${lazyDerivation { inherit derivation }}\"\n(lazyDerivation { inherit derivation }).outPath\n(lazyDerivation { inherit derivation }).meta\nAnd the following expressions are not valid, because the refer to\nimplementation details and/or attributes that may not be present on\nsome derivations:\n(lazyDerivation { inherit derivation }).buildInputs\n(lazyDerivation { inherit derivation }).passthru\n(lazyDerivation { inherit derivation }).pythonPath\n\n# Arguments\n\n\n",
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"path": ["lib", "derivations", "lazyDerivation"],
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{
"meta": {
"title": "lib.fileset.difference",
"path": ["lib", "fileset", "difference"],
"aliases": [],
"signature": "union :: FileSet -> FileSet -> FileSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/fileset/default.nix",
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"column": 3
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"lambda_position": {
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"path": ["lib", "fileset", "difference"],
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"content": {
"content": "\nThe file set containing all files from the first file set that are not in the second file set.\nSee also [Difference (set theory)](https://en.wikipedia.org/wiki/Complement_(set_theory)#Relative_complement).\nThe given file sets are evaluated as lazily as possible,\nwith the first argument being evaluated first if needed.\n\n# Example\n\n```nix\n# Create a file set containing all files from the current directory,\n# except ones under ./tests\ndifference ./. ./tests\nlet\n # A set of Nix-related files\n nixFiles = unions [ ./default.nix ./nix ./tests/default.nix ];\nin\n# Create a file set containing all files under ./tests, except ones in `nixFiles`,\n# meaning only without ./tests/default.nix\ndifference ./tests nixFiles\n```\n\n# Type\n\n```\nunion :: FileSet -> FileSet -> FileSet\n```\n\n# Arguments\n\n- [positive] The positive file set. The result can only contain files that are also in this file set. This argument can also be a path, which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n- [negative] The negative file set. The result will never contain files that are also in this file set. This argument can also be a path, which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n",
"source": {
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"path": ["lib", "fileset", "difference"],
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"meta": {
"title": "lib.fileset.fileFilter",
"path": ["lib", "fileset", "fileFilter"],
"aliases": [],
"signature": "fileFilter ::\n ({\n name :: String,\n type :: String,\n ...\n } -> Bool)\n -> Path\n -> FileSet\n",
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"content": {
"content": "\nFilter a file set to only contain files matching some predicate.\n\n# Example\n\n```nix\n# Include all regular `default.nix` files in the current directory\nfileFilter (file: file.name == \"default.nix\") ./.\n# Include all non-Nix files from the current directory\nfileFilter (file: ! hasSuffix \".nix\" file.name) ./.\n# Include all files that start with a \".\" in the current directory\nfileFilter (file: hasPrefix \".\" file.name) ./.\n# Include all regular files (not symlinks or others) in the current directory\nfileFilter (file: file.type == \"regular\") ./.\n```\n\n# Type\n\n```\nfileFilter ::\n ({\n name :: String,\n type :: String,\n ...\n } -> Bool)\n -> Path\n -> FileSet\n```\n\n# Arguments\n\n- [predicate] The predicate function to call on all files contained in given file set. A file is included in the resulting file set if this function returns true for it.\n\n This function is called with an attribute set containing these attributes:\n\n - `name` (String): The name of the file\n\n - `type` (String, one of `\"regular\"`, `\"symlink\"` or `\"unknown\"`): The type of the file.\n This matches result of calling [`builtins.readFileType`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-readFileType) on the file's path.\n\n Other attributes may be added in the future.\n\n- [path] The path whose files to filter\n\n",
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"path": ["lib", "fileset", "fileFilter"],
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{
"meta": {
"title": "lib.fileset.fromSource",
"path": ["lib", "fileset", "fromSource"],
"aliases": [],
"signature": "fromSource :: SourceLike -> FileSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/fileset/default.nix",
"line": 253,
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/fileset/default.nix",
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"content": {
"content": "\nCreate a file set with the same files as a `lib.sources`-based value.\nThis does not import any of the files into the store.\nThis can be used to gradually migrate from `lib.sources`-based filtering to `lib.fileset`.\nA file set can be turned back into a source using [`toSource`](#function-library-lib.fileset.toSource).\n:::{.note}\nFile sets cannot represent empty directories.\nTurning the result of this function back into a source using `toSource` will therefore not preserve empty directories.\n:::\n\n# Example\n\n```nix\n# There's no cleanSource-like function for file sets yet,\n# but we can just convert cleanSource to a file set and use it that way\ntoSource {\n root = ./.;\n fileset = fromSource (lib.sources.cleanSource ./.);\n}\n# Keeping a previous sourceByRegex (which could be migrated to `lib.fileset.unions`),\n# but removing a subdirectory using file set functions\ndifference\n (fromSource (lib.sources.sourceByRegex ./. [\n \"^README\\.md$\"\n # This regex includes everything in ./doc\n \"^doc(/.*)?$\"\n ])\n ./doc/generated\n# Use cleanSource, but limit it to only include ./Makefile and files under ./src\nintersection\n (fromSource (lib.sources.cleanSource ./.))\n (unions [\n ./Makefile\n ./src\n ]);\n```\n\n# Type\n\n```\nfromSource :: SourceLike -> FileSet\n```\n\n# Arguments\n\n- [source] \n\n",
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"meta": {
"title": "lib.fileset.gitTracked",
"path": ["lib", "fileset", "gitTracked"],
"aliases": [],
"signature": "gitTracked :: Path -> FileSet\n",
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "fileset", "gitTracked"],
"pos_type": "Attribute"
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"content": {
"content": "\nCreate a file set containing all [Git-tracked files](https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository) in a repository.\nThis function behaves like [`gitTrackedWith { }`](#function-library-lib.fileset.gitTrackedWith) - using the defaults.\n\n# Example\n\n```nix\n# Include all files tracked by the Git repository in the current directory\ngitTracked ./.\n# Include only files tracked by the Git repository in the parent directory\n# that are also in the current directory\nintersection ./. (gitTracked ../.)\n```\n\n# Type\n\n```\ngitTracked :: Path -> FileSet\n```\n\n# Arguments\n\n- [path] The [path](https://nixos.org/manual/nix/stable/language/values#type-path) to the working directory of a local Git repository. This directory must contain a `.git` file or subdirectory.\n\n\n",
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"path": ["lib", "fileset", "gitTracked"],
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},
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"meta": {
"title": "lib.fileset.gitTrackedWith",
"path": ["lib", "fileset", "gitTrackedWith"],
"aliases": [],
"signature": "gitTrackedWith :: { recurseSubmodules :: Bool ? false } -> Path -> FileSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/fileset/default.nix",
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"lambda_position": {
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"content": "\nCreate a file set containing all [Git-tracked files](https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository) in a repository.\nThe first argument allows configuration with an attribute set,\nwhile the second argument is the path to the Git working tree.\nIf you don't need the configuration,\nyou can use [`gitTracked`](#function-library-lib.fileset.gitTracked) instead.\nThis is equivalent to the result of [`unions`](#function-library-lib.fileset.unions) on all files returned by [`git ls-files`](https://git-scm.com/docs/git-ls-files)\n(which uses [`--cached`](https://git-scm.com/docs/git-ls-files#Documentation/git-ls-files.txt--c) by default).\n:::{.warning}\nCurrently this function is based on [`builtins.fetchGit`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-fetchGit)\nAs such, this function causes all Git-tracked files to be unnecessarily added to the Nix store,\nwithout being re-usable by [`toSource`](#function-library-lib.fileset.toSource).\nThis may change in the future.\n:::\n\n# Example\n\n```nix\n# Include all files tracked by the Git repository in the current directory\n# and any submodules under it\ngitTracked { recurseSubmodules = true; } ./.\n```\n\n# Type\n\n```\ngitTrackedWith :: { recurseSubmodules :: Bool ? false } -> Path -> FileSet\n```\n\n# Arguments\n\n- [path] The [path](https://nixos.org/manual/nix/stable/language/values#type-path) to the working directory of a local Git repository. This directory must contain a `.git` file or subdirectory.\n\n\n",
"source": {
"position": {
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"line": 768,
"column": 3
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"path": ["lib", "fileset", "gitTrackedWith"],
"pos_type": "Attribute"
}
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},
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"meta": {
"title": "lib.fileset.intersection",
"path": ["lib", "fileset", "intersection"],
"aliases": [],
"signature": "intersection :: FileSet -> FileSet -> FileSet\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nThe file set containing all files that are in both of two given file sets.\nSee also [Intersection (set theory)](https://en.wikipedia.org/wiki/Intersection_(set_theory)).\nThe given file sets are evaluated as lazily as possible,\nwith the first argument being evaluated first if needed.\n\n# Example\n\n```nix\n# Limit the selected files to the ones in ./., so only ./src and ./Makefile\nintersection ./. (unions [ ../LICENSE ./src ./Makefile ])\n```\n\n# Type\n\n```\nintersection :: FileSet -> FileSet -> FileSet\n```\n\n# Arguments\n\n- [fileset1] The first file set. This argument can also be a path, which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n- [fileset2] The second file set. This argument can also be a path, which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n",
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"title": "lib.fileset.toSource",
"path": ["lib", "fileset", "toSource"],
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"signature": "toSource :: {\n root :: Path,\n fileset :: FileSet,\n} -> SourceLike\n",
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"content": "\nAdd the local files contained in `fileset` to the store as a single [store path](https://nixos.org/manual/nix/stable/glossary#gloss-store-path) rooted at `root`.\nThe result is the store path as a string-like value, making it usable e.g. as the `src` of a derivation, or in string interpolation:\n```nix\nstdenv.mkDerivation {\nsrc = lib.fileset.toSource { ... };\n# ...\n}\n```\nThe name of the store path is always `source`.\n\n# Example\n\n```nix\n# Import the current directory into the store\n# but only include files under ./src\ntoSource {\n root = ./.;\n fileset = ./src;\n}\n=> \"/nix/store/...-source\"\n# Import the current directory into the store\n# but only include ./Makefile and all files under ./src\ntoSource {\n root = ./.;\n fileset = union\n ./Makefile\n ./src;\n}\n=> \"/nix/store/...-source\"\n# Trying to include a file outside the root will fail\ntoSource {\n root = ./.;\n fileset = unions [\n ./Makefile\n ./src\n ../LICENSE\n ];\n}\n=> <error>\n# The root needs to point to a directory that contains all the files\ntoSource {\n root = ../.;\n fileset = unions [\n ./Makefile\n ./src\n ../LICENSE\n ];\n}\n=> \"/nix/store/...-source\"\n# The root has to be a local filesystem path\ntoSource {\n root = \"/nix/store/...-source\";\n fileset = ./.;\n}\n=> <error>\n```\n\n# Type\n\n```\ntoSource :: {\n root :: Path,\n fileset :: FileSet,\n} -> SourceLike\n```\n\n# Arguments\n\n\n",
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"title": "lib.fileset.trace",
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"signature": "trace :: FileSet -> Any -> Any\n",
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"content": {
"content": "\nIncrementally evaluate and trace a file set in a pretty way.\nThis function is only intended for debugging purposes.\nThe exact tracing format is unspecified and may change.\nThis function takes a final argument to return.\nIn comparison, [`traceVal`](#function-library-lib.fileset.traceVal) returns\nthe given file set argument.\nThis variant is useful for tracing file sets in the Nix repl.\n\n# Example\n\n```nix\ntrace (unions [ ./Makefile ./src ./tests/run.sh ]) null\n=>\ntrace: /home/user/src/myProject\ntrace: - Makefile (regular)\ntrace: - src (all files in directory)\ntrace: - tests\ntrace: - run.sh (regular)\nnull\n```\n\n# Type\n\n```\ntrace :: FileSet -> Any -> Any\n```\n\n# Arguments\n\n- [fileset] The file set to trace. \n This argument can also be a path,\n which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n\n",
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"title": "lib.fileset.traceVal",
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"signature": "traceVal :: FileSet -> FileSet\n",
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"content": {
"content": "\nIncrementally evaluate and trace a file set in a pretty way.\nThis function is only intended for debugging purposes.\nThe exact tracing format is unspecified and may change.\nThis function returns the given file set.\nIn comparison, [`trace`](#function-library-lib.fileset.trace) takes another argument to return.\nThis variant is useful for tracing file sets passed as arguments to other functions.\n\n# Example\n\n```nix\ntoSource {\n root = ./.;\n fileset = traceVal (unions [\n ./Makefile\n ./src\n ./tests/run.sh\n ]);\n}\n=>\ntrace: /home/user/src/myProject\ntrace: - Makefile (regular)\ntrace: - src (all files in directory)\ntrace: - tests\ntrace: - run.sh (regular)\n\"/nix/store/...-source\"\n```\n\n# Type\n\n```\ntraceVal :: FileSet -> FileSet\n```\n\n# Arguments\n\n- [fileset] The file set to trace and return. \n This argument can also be a path,\n which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n\n",
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"meta": {
"title": "lib.fileset.union",
"path": ["lib", "fileset", "union"],
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"signature": "union :: FileSet -> FileSet -> FileSet\n",
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"content": "\nThe file set containing all files that are in either of two given file sets.\nThis is the same as [`unions`](#function-library-lib.fileset.unions),\nbut takes just two file sets instead of a list.\nSee also [Union (set theory)](https://en.wikipedia.org/wiki/Union_(set_theory)).\nThe given file sets are evaluated as lazily as possible,\nwith the first argument being evaluated first if needed.\n\n# Example\n\n```nix\n# Create a file set containing the file `Makefile`\n# and all files recursively in the `src` directory\nunion ./Makefile ./src\n# Create a file set containing the file `Makefile`\n# and the LICENSE file from the parent directory\nunion ./Makefile ../LICENSE\n```\n\n# Type\n\n```\nunion :: FileSet -> FileSet -> FileSet\n```\n\n# Arguments\n\n- [fileset1] The first file set. This argument can also be a path, which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n- [fileset2] The second file set. This argument can also be a path, which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n",
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"meta": {
"title": "lib.fileset.unions",
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"signature": "unions :: [ FileSet ] -> FileSet\n",
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"content": {
"content": "\nThe file set containing all files that are in any of the given file sets.\nThis is the same as [`union`](#function-library-lib.fileset.unions),\nbut takes a list of file sets instead of just two.\nSee also [Union (set theory)](https://en.wikipedia.org/wiki/Union_(set_theory)).\nThe given file sets are evaluated as lazily as possible,\nwith earlier elements being evaluated first if needed.\n\n# Example\n\n```nix\n# Create a file set containing selected files\nunions [\n # Include the single file `Makefile` in the current directory\n # This errors if the file doesn't exist\n ./Makefile\n # Recursively include all files in the `src/code` directory\n # If this directory is empty this has no effect\n ./src/code\n # Include the files `run.sh` and `unit.c` from the `tests` directory\n ./tests/run.sh\n ./tests/unit.c\n # Include the `LICENSE` file from the parent directory\n ../LICENSE\n]\n```\n\n# Type\n\n```\nunions :: [ FileSet ] -> FileSet\n```\n\n# Arguments\n\n- [filesets] A list of file sets. The elements can also be paths, which get [implicitly coerced to file sets](#sec-fileset-path-coercion).\n\n",
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"title": "lib.filesystem.haskellPathsInDir",
"path": ["lib", "filesystem", "haskellPathsInDir"],
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"signature": "Path -> Map String Path\n",
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"path": ["lib", "filesystem", "haskellPathsInDir"],
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"content": "\nA map of all haskell packages defined in the given path,\nidentified by having a cabal file with the same name as the\ndirectory itself.\n\n# Type\n\n```\nPath -> Map String Path\n```\n\n# Arguments\n\n- [root] The directory within to search\n\n",
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"meta": {
"title": "lib.filesystem.listFilesRecursive",
"path": ["lib", "filesystem", "listFilesRecursive"],
"aliases": [],
"signature": "Path -> [ Path ]\n",
"is_primop": false,
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"path": ["lib", "filesystem", "listFilesRecursive"],
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"content": {
"content": "\nGiven a directory, return a flattened list of all files within it recursively.\n\n# Type\n\n```\nPath -> [ Path ]\n```\n\n# Arguments\n\n- [dir] The path to recursively list\n\n",
"source": {
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"meta": {
"title": "lib.filesystem.locateDominatingFile",
"path": ["lib", "filesystem", "locateDominatingFile"],
"aliases": [],
"signature": "RegExp -> Path -> Nullable { path : Path; matches : [ MatchResults ]; }\n",
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"path": ["lib", "filesystem", "locateDominatingFile"],
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"content": {
"content": "\nFind the first directory containing a file matching 'pattern'\nupward from a given 'file'.\nReturns 'null' if no directories contain a file matching 'pattern'.\n\n# Type\n\n```\nRegExp -> Path -> Nullable { path : Path; matches : [ MatchResults ]; }\n```\n\n# Arguments\n\n- [pattern] The pattern to search for\n- [file] The file to start searching upward from\n\n",
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"title": "lib.filesystem.pathIsDirectory",
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"aliases": [
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"signature": "pathIsDirectory :: Path -> Bool\n",
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"content": "\nWhether a path exists and is a directory.\n\n# Example\n\n```nix\npathIsDirectory /.\n=> true\npathIsDirectory /this/does/not/exist\n=> false\npathIsDirectory /some/file.nix\n=> false\n```\n\n# Type\n\n```\npathIsDirectory :: Path -> Bool\n```\n\n# Arguments\n\n- [path] \n\n",
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"title": "lib.filesystem.pathIsRegularFile",
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"signature": "pathIsRegularFile :: Path -> Bool\n",
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"content": "\nWhether a path exists and is a regular file, meaning not a symlink or any other special file type.\n\n# Example\n\n```nix\npathIsRegularFile /.\n=> false\npathIsRegularFile /this/does/not/exist\n=> false\npathIsRegularFile /some/file.nix\n=> true\n```\n\n# Type\n\n```\npathIsRegularFile :: Path -> Bool\n```\n\n# Arguments\n\n- [path] \n\n",
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"title": "lib.filesystem.pathType",
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"signature": "pathType :: Path -> String\n",
"is_primop": true,
"primop_meta": {
"name": "readFileType",
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"experimental": false,
"arity": 1
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"content": "\nThe type of a path. The path needs to exist and be accessible.\nThe result is either \"directory\" for a directory, \"regular\" for a regular file, \"symlink\" for a symlink, or \"unknown\" for anything else.\n\n# Example\n\n```nix\npathType /.\n=> \"directory\"\npathType /some/file.nix\n=> \"regular\"\n```\n\n# Type\n\n```\npathType :: Path -> String\n```\n",
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"content": "\nCompose two extending functions of the type expected by 'extends'\ninto one where changes made in the first are available in the\n'super' of the second\n\n# Arguments\n\n- [f] \n- [g] \n- [final] \n- [prev] \n\n",
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"content": "\nCompose several extending functions of the type expected by 'extends' into\none where changes made in preceding functions are made available to\nsubsequent ones.\n```\ncomposeManyExtensions : [packageSet -> packageSet -> packageSet] -> packageSet -> packageSet -> packageSet\n^final ^prev ^overrides ^final ^prev ^overrides\n```\n",
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"content": "\nReturn the fixpoint that `f` converges to when called iteratively, starting\nwith the input `x`.\n```\nnix-repl> converge (x: x / 2) 16\n0\n```\n\n# Type\n\n```\n(a -> a) -> a -> a\n```\n\n# Arguments\n\n- [f] \n- [x] \n\n",
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"content": "\nModify the contents of an explicitly recursive attribute set in a way that\nhonors `self`-references. This is accomplished with a function\n```nix\ng = self: super: { foo = super.foo + \" + \"; }\n```\nthat has access to the unmodified input (`super`) as well as the final\nnon-recursive representation of the attribute set (`self`). `extends`\ndiffers from the native `//` operator insofar as that it's applied *before*\nreferences to `self` are resolved:\n```\nnix-repl> fix (extends g f)\n{ bar = \"bar\"; foo = \"foo + \"; foobar = \"foo + bar\"; }\n```\nThe name of the function is inspired by object-oriented inheritance, i.e.\nthink of it as an infix operator `g extends f` that mimics the syntax from\nJava. It may seem counter-intuitive to have the \"base class\" as the second\nargument, but it's nice this way if several uses of `extends` are cascaded.\nTo get a better understanding how `extends` turns a function with a fix\npoint (the package set we start with) into a new function with a different fix\npoint (the desired packages set) lets just see, how `extends g f`\nunfolds with `g` and `f` defined above:\n```\nextends g f = self: let super = f self; in super // g self super;\n= self: let super = { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; }; in super // g self super\n= self: { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; } // g self { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; }\n= self: { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; } // { foo = \"foo\" + \" + \"; }\n= self: { foo = \"foo + \"; bar = \"bar\"; foobar = self.foo + self.bar; }\n```\n\n# Arguments\n\n- [f] \n- [rattrs] \n- [self] \n\n",
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"content": "\n`fix f` computes the fixed point of the given function `f`. In other words, the return value is `x` in `x = f x`.\n`f` must be a lazy function.\nThis means that `x` must be a value that can be partially evaluated,\nsuch as an attribute set, a list, or a function.\nThis way, `f` can use one part of `x` to compute another part.\n**Relation to syntactic recursion**\nThis section explains `fix` by refactoring from syntactic recursion to a call of `fix` instead.\nFor context, Nix lets you define attributes in terms of other attributes syntactically using the [`rec { }` syntax](https://nixos.org/manual/nix/stable/language/constructs.html#recursive-sets).\n```nix\nnix-repl> rec {\nfoo = \"foo\";\nbar = \"bar\";\nfoobar = foo + bar;\n}\n{ bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\n```\nThis is convenient when constructing a value to pass to a function for example,\nbut an equivalent effect can be achieved with the `let` binding syntax:\n```nix\nnix-repl> let self = {\nfoo = \"foo\";\nbar = \"bar\";\nfoobar = self.foo + self.bar;\n}; in self\n{ bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\n```\nBut in general you can get more reuse out of `let` bindings by refactoring them to a function.\n```nix\nnix-repl> f = self: {\nfoo = \"foo\";\nbar = \"bar\";\nfoobar = self.foo + self.bar;\n}\n```\nThis is where `fix` comes in, it contains the syntactic recursion that's not in `f` anymore.\n```nix\nnix-repl> fix = f:\nlet self = f self; in self;\n```\nBy applying `fix` we get the final result.\n```nix\nnix-repl> fix f\n{ bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\n```\nSuch a refactored `f` using `fix` is not useful by itself.\nSee [`extends`](#function-library-lib.fixedPoints.extends) for an example use case.\nThere `self` is also often called `final`.\n\n# Example\n\n```nix\nfix (self: { foo = \"foo\"; bar = \"bar\"; foobar = self.foo + self.bar; })\n=> { bar = \"bar\"; foo = \"foo\"; foobar = \"foobar\"; }\nfix (self: [ 1 2 (elemAt self 0 + elemAt self 1) ])\n=> [ 1 2 3 ]\n```\n\n# Type\n\n```\nfix :: (a -> a) -> a\n```\n\n# Arguments\n\n- [f] \n\n",
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"content": "\nA variant of `fix` that records the original recursive attribute set in the\nresult, in an attribute named `__unfix__`.\nThis is useful in combination with the `extends` function to\nimplement deep overriding.\n\n# Arguments\n\n- [f] \n\n",
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"content": "\nCreate an overridable, recursive attribute set. For example:\n```\nnix-repl> obj = makeExtensible (self: { })\nnix-repl> obj\n{ __unfix__ = «lambda»; extend = «lambda»; }\nnix-repl> obj = obj.extend (self: super: { foo = \"foo\"; })\nnix-repl> obj\n{ __unfix__ = «lambda»; extend = «lambda»; foo = \"foo\"; }\nnix-repl> obj = obj.extend (self: super: { foo = super.foo + \" + \"; bar = \"bar\"; foobar = self.foo + self.bar; })\nnix-repl> obj\n{ __unfix__ = «lambda»; bar = \"bar\"; extend = «lambda»; foo = \"foo + \"; foobar = \"foo + bar\"; }\n```\n",
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"content": {
"content": "\nSame as `makeExtensible` but the name of the extending attribute is\ncustomized.\n\n# Arguments\n\n- [extenderName] \n- [rattrs] \n\n",
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"content": "\nGenerate a line of key k and value v, separated by\n* character sep. If sep appears in k, it is escaped.\n* Helper for synaxes with different separators.\n*\n* mkValueString specifies how values should be formatted.\n*\n* mkKeyValueDefault {} \":\" \"f:oo\" \"bar\"\n* > \"f\\:oo:bar\"\n\n# Arguments\n\n- [sep] \n- [k] \n- [v] \n\n",
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"title": "lib.generators.mkLuaInline",
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"content": "\nMark string as Lua expression to be inlined when processed by toLua.\n\n# Type\n\n```\nmkLuaInline :: String -> AttrSet\n```\n\n# Arguments\n\n- [expr] \n\n",
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"content": {
"content": "\nConvert a value to a sensible default string representation.\n* The builtin `toString` function has some strange defaults,\n* suitable for bash scripts but not much else.\n\n# Arguments\n\n- [v] \n\n",
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"content": {
"content": "\nTranslate a simple Nix expression to Dhall notation.\n* Note that integers are translated to Integer and never\n* the Natural type.\n\n# Arguments\n\n- [v] \n\n",
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"content": "\nGenerate a git-config file from an attrset.\n*\n* It has two major differences from the regular INI format:\n*\n* 1. values are indented with tabs\n* 2. sections can have sub-sections\n*\n* generators.toGitINI {\n* url.\"ssh://git@github.com/\".insteadOf = \"https://github.com\";\n* user.name = \"edolstra\";\n* }\n*\n*> [url \"ssh://git@github.com/\"]\n*> insteadOf = \"https://github.com\"\n*>\n*> [user]\n*> name = \"edolstra\"\n\n# Arguments\n\n- [attrs] \n\n",
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"content": "\nGenerate an INI-style config file from an\n* attrset of sections to an attrset of key-value pairs.\n*\n* generators.toINI {} {\n* foo = { hi = \"${pkgs.hello}\"; ciao = \"bar\"; };\n* baz = { \"also, integers\" = 42; };\n* }\n*\n*> [baz]\n*> also, integers=42\n*>\n*> [foo]\n*> ciao=bar\n*> hi=/nix/store/y93qql1p5ggfnaqjjqhxcw0vqw95rlz0-hello-2.10\n*\n* The mk* configuration attributes can generically change\n* the way sections and key-value strings are generated.\n*\n* For more examples see the test cases in ./tests/misc.nix.\n\n# Arguments\n\n- [attrsOfAttrs] \n\n",
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"content": "\nGenerate an INI-style config file from an attrset\n* specifying the global section (no header), and an\n* attrset of sections to an attrset of key-value pairs.\n*\n* generators.toINIWithGlobalSection {} {\n* globalSection = {\n* someGlobalKey = \"hi\";\n* };\n* sections = {\n* foo = { hi = \"${pkgs.hello}\"; ciao = \"bar\"; };\n* baz = { \"also, integers\" = 42; };\n* }\n*\n*> someGlobalKey=hi\n*>\n*> [baz]\n*> also, integers=42\n*>\n*> [foo]\n*> ciao=bar\n*> hi=/nix/store/y93qql1p5ggfnaqjjqhxcw0vqw95rlz0-hello-2.10\n*\n* The mk* configuration attributes can generically change\n* the way sections and key-value strings are generated.\n*\n* For more examples see the test cases in ./tests/misc.nix.\n*\n* If you don’t need a global section, you can also use\n* `generators.toINI` directly, which only takes\n* the part in `sections`.\n\n# Arguments\n\n\n",
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"content": "\nGenerates JSON from an arbitrary (non-function) value.\n* For more information see the documentation of the builtin.\n\n# Arguments\n\n\n",
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"content": "\nGenerate a key-value-style config file from an attrset.\n*\n* mkKeyValue is the same as in toINI.\n\n# Arguments\n\n\n",
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"content": "\nTranslate a simple Nix expression to Lua representation with occasional\nLua-inlines that can be constructed by mkLuaInline function.\nConfiguration:\n* multiline - by default is true which results in indented block-like view.\n* indent - initial indent.\n* asBindings - by default generate single value, but with this use attrset to set global vars.\nAttention:\nRegardless of multiline parameter there is no trailing newline.\n\n# Example\n\n```nix\ngenerators.toLua {}\n {\n cmd = [ \"typescript-language-server\" \"--stdio\" ];\n settings.workspace.library = mkLuaInline ''vim.api.nvim_get_runtime_file(\"\", true)'';\n }\n->\n {\n [\"cmd\"] = {\n \"typescript-language-server\",\n \"--stdio\"\n },\n [\"settings\"] = {\n [\"workspace\"] = {\n [\"library\"] = (vim.api.nvim_get_runtime_file(\"\", true))\n }\n }\n }\n```\n\n# Type\n\n```\ntoLua :: AttrSet -> Any -> String\n```\n\n# Arguments\n\n- [v] \n\n",
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"content": "\nPretty print a value, akin to `builtins.trace`.\n* Should probably be a builtin as well.\n* The pretty-printed string should be suitable for rendering default values\n* in the NixOS manual. In particular, it should be as close to a valid Nix expression\n* as possible.\n\n# Arguments\n\n\n",
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"content": "\nYAML has been a strict superset of JSON since 1.2, so we\n* use toJSON. Before it only had a few differences referring\n* to implicit typing rules, so it should work with older\n* parsers as well.\n",
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"content": "\nCheck if a value is a GVariant value\n\n# Type\n\n```\nisGVariant :: Any -> Bool\n```\n\n# Arguments\n\n- [v] \n\n",
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"content": "\nReturns the GVariant array from the given type of the elements and a Nix list.\n\n# Example\n\n```nix\n# Creating a string array\nlib.gvariant.mkArray [ \"a\" \"b\" \"c\" ]\n```\n\n# Type\n\n```\nmkArray :: [Any] -> gvariant\n```\n\n# Arguments\n\n- [elems] \n\n",
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"content": "\nReturns the GVariant boolean from the given Nix bool value.\n\n# Type\n\n```\nmkBoolean :: Bool -> gvariant\n```\n\n# Arguments\n\n- [v] \n\n",
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"content": "\nReturns the GVariant dictionary entry from the given key and value.\n\n# Example\n\n```nix\n# A dictionary describing an Epiphany’s search provider\n[\n (lib.gvariant.mkDictionaryEntry \"url\" (lib.gvariant.mkVariant \"https://duckduckgo.com/?q=%s&t=epiphany\"))\n (lib.gvariant.mkDictionaryEntry \"bang\" (lib.gvariant.mkVariant \"!d\"))\n (lib.gvariant.mkDictionaryEntry \"name\" (lib.gvariant.mkVariant \"DuckDuckGo\"))\n]\n```\n\n# Type\n\n```\nmkDictionaryEntry :: String -> Any -> gvariant\n```\n\n# Arguments\n\n- [name] The key of the entry\n- [value] The value of the entry\n\n",
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"content": "\nReturns the GVariant double from the given Nix float value.\n\n# Type\n\n```\nmkDouble :: Float -> gvariant\n```\n\n# Arguments\n\n- [v] \n\n",
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"content": {
"content": "\nCommon patterns/legacy used in common-config/hardened/config.nix\n\n# Arguments\n\n- [version] \n\n",
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["lib", "all"]
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"signature": "all :: (a -> bool) -> [a] -> bool\n",
"is_primop": true,
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"path": ["lib", "lists", "all"],
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"content": {
"content": "\nReturn true if function `pred` returns true for all elements of\n`list`.\n\n# Example\n\n```nix\nall (x: x < 3) [ 1 2 ]\n=> true\nall (x: x < 3) [ 1 2 3 ]\n=> false\n```\n\n# Type\n\n```\nall :: (a -> bool) -> [a] -> bool\n```\n",
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"meta": {
"title": "lib.lists.allUnique",
"path": ["lib", "lists", "allUnique"],
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"signature": "allUnique :: [a] -> bool\n",
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"path": ["lib", "lists", "allUnique"],
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"content": {
"content": "\nCheck if list contains only unique elements. O(n^2) complexity.\n\n# Example\n\n```nix\nallUnique [ 3 2 3 4 ]\n=> false\nallUnique [ 3 2 4 1 ]\n=> true\n```\n\n# Type\n\n```\nallUnique :: [a] -> bool\n```\n\n# Arguments\n\n- [list] \n\n",
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"meta": {
"title": "lib.lists.any",
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["lib", "any"]
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"signature": "any :: (a -> bool) -> [a] -> bool\n",
"is_primop": true,
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"content": {
"content": "\nReturn true if function `pred` returns true for at least one\nelement of `list`.\n\n# Example\n\n```nix\nany isString [ 1 \"a\" { } ]\n=> true\nany isString [ 1 { } ]\n=> false\n```\n\n# Type\n\n```\nany :: (a -> bool) -> [a] -> bool\n```\n",
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"content": "\nThe common prefix of two lists.\n\n# Example\n\n```nix\ncommonPrefix [ 1 2 3 4 5 6 ] [ 1 2 4 8 ]\n=> [ 1 2 ]\ncommonPrefix [ 1 2 3 ] [ 1 2 3 4 5 ]\n=> [ 1 2 3 ]\ncommonPrefix [ 1 2 3 ] [ 4 5 6 ]\n=> [ ]\n```\n\n# Type\n\n```\ncommonPrefix :: [a] -> [a] -> [a]\n```\n\n# Arguments\n\n- [list1] \n- [list2] \n\n",
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"meta": {
"title": "lib.lists.compareLists",
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"content": "\nCompare two lists element-by-element.\n\n# Example\n\n```nix\ncompareLists compare [] []\n=> 0\ncompareLists compare [] [ \"a\" ]\n=> -1\ncompareLists compare [ \"a\" ] []\n=> 1\ncompareLists compare [ \"a\" \"b\" ] [ \"a\" \"c\" ]\n=> -1\n```\n\n# Arguments\n\n- [cmp] \n- [a] \n- [b] \n\n",
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"meta": {
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"content": {
"content": "\nConcatenate a list of lists into a single list.\n",
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"content": {
"content": "\nMap and concatenate the result.\n\n# Example\n\n```nix\nconcatMap (x: [x] ++ [\"z\"]) [\"a\" \"b\"]\n=> [ \"a\" \"z\" \"b\" \"z\" ]\n```\n\n# Type\n\n```\nconcatMap :: (a -> [b]) -> [a] -> [b]\n```\n",
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"content": "\nCount how many elements of `list` match the supplied predicate\nfunction.\n\n# Example\n\n```nix\ncount (x: x == 3) [ 3 2 3 4 6 ]\n=> 2\n```\n\n# Type\n\n```\ncount :: (a -> bool) -> [a] -> int\n```\n\n# Arguments\n\n- [pred] Predicate\n\n",
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"content": "\nReturn `true` if a value equal to *x* occurs in the list *xs*, and\n`false` otherwise.\n",
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"meta": {
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},
"content": {
"content": "\nReturn a list consisting of the elements of *list* for which the\nfunction *f* returns `true`.\n",
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"meta": {
"title": "lib.lists.findFirst",
"path": ["lib", "lists", "findFirst"],
"aliases": [["lib", "findFirst"]],
"signature": "findFirst :: (a -> bool) -> a -> [a] -> a\n",
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"content": "\nFind the first element in the list matching the specified\npredicate or return `default` if no such element exists.\n\n# Example\n\n```nix\nfindFirst (x: x > 3) 7 [ 1 6 4 ]\n=> 6\nfindFirst (x: x > 9) 7 [ 1 6 4 ]\n=> 7\n```\n\n# Type\n\n```\nfindFirst :: (a -> bool) -> a -> [a] -> a\n```\n\n# Arguments\n\n- [pred] Predicate\n- [default] Default value to return\n- [list] Input list\n\n",
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"title": "lib.lists.findFirstIndex",
"path": ["lib", "lists", "findFirstIndex"],
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"signature": "findFirstIndex :: (a -> Bool) -> b -> [a] -> (Int | b)\n",
"is_primop": false,
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"content": {
"content": "\nFind the first index in the list matching the specified\npredicate or return `default` if no such element exists.\n\n# Example\n\n```nix\nfindFirstIndex (x: x > 3) null [ 0 6 4 ]\n=> 1\nfindFirstIndex (x: x > 9) null [ 0 6 4 ]\n=> null\n```\n\n# Type\n\n```\nfindFirstIndex :: (a -> Bool) -> b -> [a] -> (Int | b)\n```\n\n# Arguments\n\n- [pred] Predicate\n- [default] Default value to return\n- [list] Input list\n\n",
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"title": "lib.lists.findSingle",
"path": ["lib", "lists", "findSingle"],
"aliases": [["lib", "findSingle"]],
"signature": "findSingle :: (a -> bool) -> a -> a -> [a] -> a\n",
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"content": {
"content": "\nFind the sole element in the list matching the specified\npredicate, returns `default` if no such element exists, or\n`multiple` if there are multiple matching elements.\n\n# Example\n\n```nix\nfindSingle (x: x == 3) \"none\" \"multiple\" [ 1 3 3 ]\n=> \"multiple\"\nfindSingle (x: x == 3) \"none\" \"multiple\" [ 1 3 ]\n=> 3\nfindSingle (x: x == 3) \"none\" \"multiple\" [ 1 9 ]\n=> \"none\"\n```\n\n# Type\n\n```\nfindSingle :: (a -> bool) -> a -> a -> [a] -> a\n```\n\n# Arguments\n\n- [pred] Predicate\n- [default] Default value to return if element was not found.\n- [multiple] Default value to return if more than one element was found\n- [list] Input list\n\n",
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"title": "lib.lists.flatten",
"path": ["lib", "lists", "flatten"],
"aliases": [["lib", "flatten"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nFlatten the argument into a single list; that is, nested lists are\nspliced into the top-level lists.\n\n# Example\n\n```nix\nflatten [1 [2 [3] 4] 5]\n=> [1 2 3 4 5]\nflatten 1\n=> [1]\n```\n\n# Arguments\n\n- [x] \n\n",
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"aliases": [["lib", "fold"]],
"signature": null,
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"content": {
"content": "\n`fold` is an alias of `foldr` for historic reasons\n",
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"meta": {
"title": "lib.lists.foldl",
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"aliases": [["lib", "foldl"]],
"signature": "foldl :: (b -> a -> b) -> b -> [a] -> b\n",
"is_primop": false,
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"content": {
"content": "\n“left fold”, like `foldr`, but from the left:\n`foldl op nul [x_1 x_2 ... x_n] == op (... (op (op nul x_1) x_2) ... x_n)`.\n\n# Example\n\n```nix\nlconcat = foldl (a: b: a + b) \"z\"\nlconcat [ \"a\" \"b\" \"c\" ]\n=> \"zabc\"\n# different types\nlstrange = foldl (str: int: str + toString (int + 1)) \"a\"\nlstrange [ 1 2 3 4 ]\n=> \"a2345\"\n```\n\n# Type\n\n```\nfoldl :: (b -> a -> b) -> b -> [a] -> b\n```\n\n# Arguments\n\n- [op] \n- [nul] \n- [list] \n\n",
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"title": "lib.lists.foldl' (Prime)",
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"aliases": [["lib", "foldl'"]],
"signature": "foldl' :: (acc -> x -> acc) -> acc -> [x] -> acc\n",
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"content": {
"content": "\nReduce a list by applying a binary operator from left to right,\nstarting with an initial accumulator.\nBefore each application of the operator, the accumulator value is evaluated.\nThis behavior makes this function stricter than [`foldl`](#function-library-lib.lists.foldl).\nUnlike [`builtins.foldl'`](https://nixos.org/manual/nix/unstable/language/builtins.html#builtins-foldl'),\nthe initial accumulator argument is evaluated before the first iteration.\nA call like\n```nix\nfoldl' op acc₀ [ x₀ x₁ x₂ ... xₙ₋₁ xₙ ]\n```\nis (denotationally) equivalent to the following,\nbut with the added benefit that `foldl'` itself will never overflow the stack.\n```nix\nlet\nacc₁ = builtins.seq acc₀ (op acc₀ x₀ );\nacc₂ = builtins.seq acc₁ (op acc₁ x₁ );\nacc₃ = builtins.seq acc₂ (op acc₂ x₂ );\n...\naccₙ = builtins.seq accₙ₋₁ (op accₙ₋₁ xₙ₋₁);\naccₙ₊₁ = builtins.seq accₙ (op accₙ xₙ );\nin\naccₙ₊₁\n# Or ignoring builtins.seq\nop (op (... (op (op (op acc₀ x₀) x₁) x₂) ...) xₙ₋₁) xₙ\n```\n\n# Example\n\n```nix\nfoldl' (acc: x: acc + x) 0 [1 2 3]\n=> 6\n```\n\n# Type\n\n```\nfoldl' :: (acc -> x -> acc) -> acc -> [x] -> acc\n```\n\n# Arguments\n\n- [op] The binary operation to run, where the two arguments are: \n 1. `acc`: The current accumulator value: Either the initial one for the first iteration, or the result of the previous iteration\n 2. `x`: The corresponding list element for this iteration\n\n- [acc] The initial accumulator value\n- [list] The list to fold\n\n",
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"title": "lib.lists.foldr",
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"signature": "foldr :: (a -> b -> b) -> b -> [a] -> b\n",
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"content": "\n“right fold” a binary function `op` between successive elements of\n`list` with `nul` as the starting value, i.e.,\n`foldr op nul [x_1 x_2 ... x_n] == op x_1 (op x_2 ... (op x_n nul))`.\n\n# Example\n\n```nix\nconcat = foldr (a: b: a + b) \"z\"\nconcat [ \"a\" \"b\" \"c\" ]\n=> \"abcz\"\n# different types\nstrange = foldr (int: str: toString (int + 1) + str) \"a\"\nstrange [ 1 2 3 4 ]\n=> \"2345a\"\n```\n\n# Type\n\n```\nfoldr :: (a -> b -> b) -> b -> [a] -> b\n```\n\n# Arguments\n\n- [op] \n- [nul] \n- [list] \n\n",
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"meta": {
"title": "lib.lists.forEach",
"path": ["lib", "lists", "forEach"],
"aliases": [["lib", "forEach"]],
"signature": "forEach :: [a] -> (a -> b) -> [b]\n",
"is_primop": false,
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"content": "\nApply the function to each element in the list. Same as `map`, but arguments\nflipped.\n\n# Example\n\n```nix\nforEach [ 1 2 ] (x:\n toString x\n)\n=> [ \"1\" \"2\" ]\n```\n\n# Type\n\n```\nforEach :: [a] -> (a -> b) -> [b]\n```\n\n# Arguments\n\n- [xs] \n- [f] \n\n",
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"content": "\nGenerate list of size *length*, with each element *i* equal to the\nvalue returned by *generator* `i`. For example,\n\n```nix\nbuiltins.genList (x: x * x) 5\n```\n\nreturns the list `[ 0 1 4 9 16 ]`.\n",
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"title": "lib.lists.groupBy",
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"content": "\nGroups elements of *list* together by the string returned from the\nfunction *f* called on each element. It returns an attribute set\nwhere each attribute value contains the elements of *list* that are\nmapped to the same corresponding attribute name returned by *f*.\n\nFor example,\n\n```nix\nbuiltins.groupBy (builtins.substring 0 1) [\"foo\" \"bar\" \"baz\"]\n```\n\nevaluates to\n\n```nix\n{ b = [ \"bar\" \"baz\" ]; f = [ \"foo\" ]; }\n```\n",
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"content": "\nSplits the elements of a list into many lists, using the return value of a predicate.\nPredicate should return a string which becomes keys of attrset `groupBy` returns.\n`groupBy'` allows to customise the combining function and initial value\n\n# Example\n\n```nix\ngroupBy (x: boolToString (x > 2)) [ 5 1 2 3 4 ]\n=> { true = [ 5 3 4 ]; false = [ 1 2 ]; }\ngroupBy (x: x.name) [ {name = \"icewm\"; script = \"icewm &\";}\n {name = \"xfce\"; script = \"xfce4-session &\";}\n {name = \"icewm\"; script = \"icewmbg &\";}\n {name = \"mate\"; script = \"gnome-session &\";}\n ]\n=> { icewm = [ { name = \"icewm\"; script = \"icewm &\"; }\n { name = \"icewm\"; script = \"icewmbg &\"; } ];\n mate = [ { name = \"mate\"; script = \"gnome-session &\"; } ];\n xfce = [ { name = \"xfce\"; script = \"xfce4-session &\"; } ];\n }\ngroupBy' builtins.add 0 (x: boolToString (x > 2)) [ 5 1 2 3 4 ]\n=> { true = 12; false = 3; }\n```\n\n# Arguments\n\n- [op] \n- [nul] \n- [pred] \n- [lst] \n\n",
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"content": "\nWhether the first list is a prefix of the second list.\n\n# Example\n\n```nix\nhasPrefix [ 1 2 ] [ 1 2 3 4 ]\n=> true\nhasPrefix [ 0 1 ] [ 1 2 3 4 ]\n=> false\n```\n\n# Type\n\n```\nhasPrefix :: [a] -> [a] -> bool\n```\n\n# Arguments\n\n- [list1] \n- [list2] \n\n",
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"meta": {
"title": "lib.lists.head",
"path": ["lib", "lists", "head"],
"aliases": [
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["lib", "head"],
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"signature": null,
"is_primop": true,
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},
"content": {
"content": "\nReturn the first element of a list; abort evaluation if the argument\nisn’t a list or is an empty list. You can test whether a list is\nempty by comparing it with `[]`.\n",
"source": {
"position": null,
"path": ["lib", "lists", "head"],
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},
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"title": "lib.lists.imap0",
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"aliases": [["lib", "imap0"]],
"signature": "imap0 :: (int -> a -> b) -> [a] -> [b]\n",
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"content": {
"content": "\nMap with index starting from 0\n\n# Example\n\n```nix\nimap0 (i: v: \"${v}-${toString i}\") [\"a\" \"b\"]\n=> [ \"a-0\" \"b-1\" ]\n```\n\n# Type\n\n```\nimap0 :: (int -> a -> b) -> [a] -> [b]\n```\n\n# Arguments\n\n- [f] \n- [list] \n\n",
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"meta": {
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"aliases": [["lib", "imap1"]],
"signature": "imap1 :: (int -> a -> b) -> [a] -> [b]\n",
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"content": {
"content": "\nMap with index starting from 1\n\n# Example\n\n```nix\nimap1 (i: v: \"${v}-${toString i}\") [\"a\" \"b\"]\n=> [ \"a-1\" \"b-2\" ]\n```\n\n# Type\n\n```\nimap1 :: (int -> a -> b) -> [a] -> [b]\n```\n\n# Arguments\n\n- [f] \n- [list] \n\n",
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"meta": {
"title": "lib.lists.init",
"path": ["lib", "lists", "init"],
"aliases": [["lib", "init"]],
"signature": "init :: [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
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"content": {
"content": "\nReturn all elements but the last.\nThis function throws an error if the list is empty.\n\n# Example\n\n```nix\ninit [ 1 2 3 ]\n=> [ 1 2 ]\n```\n\n# Type\n\n```\ninit :: [a] -> [a]\n```\n\n# Arguments\n\n- [list] \n\n",
"source": {
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},
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"meta": {
"title": "lib.lists.intersectLists",
"path": ["lib", "lists", "intersectLists"],
"aliases": [["lib", "intersectLists"]],
"signature": null,
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"primop_meta": null,
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
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"path": ["lib", "lists", "intersectLists"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nIntersects list 'e' and another list. O(nm) complexity.\n\n# Example\n\n```nix\nintersectLists [ 1 2 3 ] [ 6 3 2 ]\n=> [ 3 2 ]\n```\n\n# Arguments\n\n- [e] \n\n",
"source": {
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"path": ["lib", "lists", "intersectLists"],
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},
{
"meta": {
"title": "lib.lists.isList",
"path": ["lib", "lists", "isList"],
"aliases": [
["builtins", "isList"],
["lib", "isList"],
["lib", "strings", "isList"]
],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "isList",
"args": ["e"],
"experimental": false,
"arity": 1
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"attr_position": {
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"lambda_position": null,
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"content_meta": {
"position": null,
"path": ["lib", "lists", "isList"],
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}
},
"content": {
"content": "\nReturn `true` if *e* evaluates to a list, and `false` otherwise.\n",
"source": {
"position": null,
"path": ["lib", "lists", "isList"],
"pos_type": "Lambda"
}
}
},
{
"meta": {
"title": "lib.lists.last",
"path": ["lib", "lists", "last"],
"aliases": [["lib", "last"]],
"signature": "last :: [a] -> a\n",
"is_primop": false,
"primop_meta": null,
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"content": {
"content": "\nReturn the last element of a list.\nThis function throws an error if the list is empty.\n\n# Example\n\n```nix\nlast [ 1 2 3 ]\n=> 3\n```\n\n# Type\n\n```\nlast :: [a] -> a\n```\n\n# Arguments\n\n- [list] \n\n",
"source": {
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},
{
"meta": {
"title": "lib.lists.length",
"path": ["lib", "lists", "length"],
"aliases": [
["builtins", "length"],
["lib", "length"]
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"signature": null,
"is_primop": true,
"primop_meta": {
"name": "length",
"args": ["e"],
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"path": ["lib", "lists", "length"],
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},
"content": {
"content": "\nReturn the length of the list *e*.\n",
"source": {
"position": null,
"path": ["lib", "lists", "length"],
"pos_type": "Lambda"
}
}
},
{
"meta": {
"title": "lib.lists.listDfs",
"path": ["lib", "lists", "listDfs"],
"aliases": [["lib", "listDfs"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "lists", "listDfs"],
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"content": {
"content": "\nDepth-First Search (DFS) for lists `list != []`.\n`before a b == true` means that `b` depends on `a` (there's an\nedge from `b` to `a`).\n\n# Example\n\n```nix\nlistDfs true hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" ]\n == { minimal = \"/\"; # minimal element\n visited = [ \"/home/user\" ]; # seen elements (in reverse order)\n rest = [ \"/home\" \"other\" ]; # everything else\n }\nlistDfs true hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" \"/\" ]\n == { cycle = \"/\"; # cycle encountered at this element\n loops = [ \"/\" ]; # and continues to these elements\n visited = [ \"/\" \"/home/user\" ]; # elements leading to the cycle (in reverse order)\n rest = [ \"/home\" \"other\" ]; # everything else\n```\n\n# Arguments\n\n- [stopOnCycles] \n- [before] \n- [list] \n\n",
"source": {
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
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"path": ["lib", "lists", "listDfs"],
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{
"meta": {
"title": "lib.lists.map",
"path": ["lib", "lists", "map"],
"aliases": [["builtins", "map"]],
"signature": null,
"is_primop": true,
"primop_meta": {
"name": "map",
"args": ["f", "list"],
"experimental": false,
"arity": 2
},
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"path": ["lib", "lists", "map"],
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"content": {
"content": "\nApply the function *f* to each element in the list *list*. For\nexample,\n\n```nix\nmap (x: \"foo\" + x) [ \"bar\" \"bla\" \"abc\" ]\n```\n\nevaluates to `[ \"foobar\" \"foobla\" \"fooabc\" ]`.\n",
"source": {
"position": null,
"path": ["lib", "lists", "map"],
"pos_type": "Lambda"
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},
{
"meta": {
"title": "lib.lists.mutuallyExclusive",
"path": ["lib", "lists", "mutuallyExclusive"],
"aliases": [["lib", "mutuallyExclusive"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/lists.nix",
"line": 1370,
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"path": ["lib", "lists", "mutuallyExclusive"],
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},
"content": {
"content": "\nTest if two lists have no common element.\nIt should be slightly more efficient than (intersectLists a b == [])\n\n# Arguments\n\n- [a] \n- [b] \n\n",
"source": {
"position": {
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"meta": {
"title": "lib.lists.naturalSort",
"path": ["lib", "lists", "naturalSort"],
"aliases": [["lib", "naturalSort"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
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"path": ["lib", "lists", "naturalSort"],
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"content": {
"content": "\nSort list using \"Natural sorting\".\nNumeric portions of strings are sorted in numeric order.\n\n# Example\n\n```nix\nnaturalSort [\"disk11\" \"disk8\" \"disk100\" \"disk9\"]\n=> [\"disk8\" \"disk9\" \"disk11\" \"disk100\"]\nnaturalSort [\"10.46.133.149\" \"10.5.16.62\" \"10.54.16.25\"]\n=> [\"10.5.16.62\" \"10.46.133.149\" \"10.54.16.25\"]\nnaturalSort [\"v0.2\" \"v0.15\" \"v0.0.9\"]\n=> [ \"v0.0.9\" \"v0.2\" \"v0.15\" ]\n```\n\n# Arguments\n\n- [lst] \n\n",
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"title": "lib.lists.optional",
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"aliases": [["lib", "optional"]],
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"content": {
"content": "\nReturn a singleton list or an empty list, depending on a boolean\nvalue. Useful when building lists with optional elements\n(e.g. `++ optional (system == \"i686-linux\") firefox`).\n\n# Example\n\n```nix\noptional true \"foo\"\n=> [ \"foo\" ]\noptional false \"foo\"\n=> [ ]\n```\n\n# Type\n\n```\noptional :: bool -> a -> [a]\n```\n\n# Arguments\n\n- [cond] \n- [elem] \n\n",
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"meta": {
"title": "lib.lists.optionals",
"path": ["lib", "lists", "optionals"],
"aliases": [["lib", "optionals"]],
"signature": "optionals :: bool -> [a] -> [a]\n",
"is_primop": false,
"primop_meta": null,
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"content": "\nReturn a list or an empty list, depending on a boolean value.\n\n# Example\n\n```nix\noptionals true [ 2 3 ]\n=> [ 2 3 ]\noptionals false [ 2 3 ]\n=> [ ]\n```\n\n# Type\n\n```\noptionals :: bool -> [a] -> [a]\n```\n\n# Arguments\n\n- [cond] Condition\n- [elems] List to return if condition is true\n\n",
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"meta": {
"title": "lib.lists.partition",
"path": ["lib", "lists", "partition"],
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"signature": "(a -> bool) -> [a] -> { right :: [a]; wrong :: [a]; }\n",
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"content": "\nSplits the elements of a list in two lists, `right` and\n`wrong`, depending on the evaluation of a predicate.\n\n# Example\n\n```nix\npartition (x: x > 2) [ 5 1 2 3 4 ]\n=> { right = [ 5 3 4 ]; wrong = [ 1 2 ]; }\n```\n\n# Type\n\n```\n(a -> bool) -> [a] -> { right :: [a]; wrong :: [a]; }\n```\n",
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"content": "\nRemove elements equal to 'e' from a list. Useful for buildInputs.\n\n# Example\n\n```nix\nremove 3 [ 1 3 4 3 ]\n=> [ 1 4 ]\n```\n\n# Type\n\n```\nremove :: a -> [a] -> [a]\n```\n\n# Arguments\n\n- [e] Element to remove from the list\n\n",
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"content": "\nRemove the first list as a prefix from the second list.\nError if the first list isn't a prefix of the second list.\n\n# Example\n\n```nix\nremovePrefix [ 1 2 ] [ 1 2 3 4 ]\n=> [ 3 4 ]\nremovePrefix [ 0 1 ] [ 1 2 3 4 ]\n=> <error>\n```\n\n# Type\n\n```\nremovePrefix :: [a] -> [a] -> [a]\n```\n\n# Arguments\n\n- [list1] \n- [list2] \n\n",
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"path": ["lib", "lists", "replicate"],
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"content": "\nReturn a list with `n` copies of an element.\n\n# Example\n\n```nix\nreplicate 3 \"a\"\n=> [ \"a\" \"a\" \"a\" ]\nreplicate 2 true\n=> [ true true ]\n```\n\n# Type\n\n```\nreplicate :: int -> a -> [a]\n```\n\n# Arguments\n\n- [n] \n- [elem] \n\n",
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"content": {
"content": "\nReverse the order of the elements of a list.\n\n# Example\n\n```nix\nreverseList [ \"b\" \"o\" \"j\" ]\n=> [ \"j\" \"o\" \"b\" ]\n```\n\n# Type\n\n```\nreverseList :: [a] -> [a]\n```\n\n# Arguments\n\n- [xs] \n\n",
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"content": "\nCreate a list consisting of a single element. `singleton x` is\nsometimes more convenient with respect to indentation than `[x]`\nwhen x spans multiple lines.\n\n# Example\n\n```nix\nsingleton \"foo\"\n=> [ \"foo\" ]\n```\n\n# Type\n\n```\nsingleton :: a -> [a]\n```\n\n# Arguments\n\n- [x] \n\n",
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"content": "\nSort a list based on a comparator function which compares two\nelements and returns true if the first argument is strictly below\nthe second argument. The returned list is sorted in an increasing\norder. The implementation does a quick-sort.\n\n# Example\n\n```nix\nsort (a: b: a < b) [ 5 3 7 ]\n=> [ 3 5 7 ]\n```\n",
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"content": "\nReturn a list consisting of at most `count` elements of `list`,\nstarting at index `start`.\n\n# Example\n\n```nix\nsublist 1 3 [ \"a\" \"b\" \"c\" \"d\" \"e\" ]\n=> [ \"b\" \"c\" \"d\" ]\nsublist 1 3 [ ]\n=> [ ]\n```\n\n# Type\n\n```\nsublist :: int -> int -> [a] -> [a]\n```\n\n# Arguments\n\n- [start] Index at which to start the sublist\n- [count] Number of elements to take\n- [list] Input list\n\n",
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"content": "\nSubtracts list 'e' from another list. O(nm) complexity.\n\n# Example\n\n```nix\nsubtractLists [ 3 2 ] [ 1 2 3 4 5 3 ]\n=> [ 1 4 5 ]\n```\n\n# Arguments\n\n- [e] \n\n",
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"content": "\nReturn the list without its first item; abort evaluation if\nthe argument isn’t a list or is an empty list.\n\n> **Warning**\n>\n> This function should generally be avoided since it's inefficient:\n> unlike Haskell's `tail`, it takes O(n) time, so recursing over a\n> list by repeatedly calling `tail` takes O(n^2) time.\n",
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"content": "\nReturn the first (at most) N elements of a list.\n\n# Example\n\n```nix\ntake 2 [ \"a\" \"b\" \"c\" \"d\" ]\n=> [ \"a\" \"b\" ]\ntake 2 [ ]\n=> [ ]\n```\n\n# Type\n\n```\ntake :: int -> [a] -> [a]\n```\n\n# Arguments\n\n- [count] Number of elements to take\n\n",
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"content": "\nIf argument is a list, return it; else, wrap it in a singleton\nlist. If you're using this, you should almost certainly\nreconsider if there isn't a more \"well-typed\" approach.\n\n# Example\n\n```nix\ntoList [ 1 2 ]\n=> [ 1 2 ]\ntoList \"hi\"\n=> [ \"hi \"]\n```\n\n# Arguments\n\n- [x] \n\n",
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"content": "\nSort a list based on a partial ordering using DFS. This\nimplementation is O(N^2), if your ordering is linear, use `sort`\ninstead.\n`before a b == true` means that `b` should be after `a`\nin the result.\n\n# Example\n\n```nix\ntoposort hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" ]\n == { result = [ \"/\" \"/home\" \"/home/user\" \"other\" ]; }\ntoposort hasPrefix [ \"/home/user\" \"other\" \"/\" \"/home\" \"/\" ]\n == { cycle = [ \"/home/user\" \"/\" \"/\" ]; # path leading to a cycle\n loops = [ \"/\" ]; } # loops back to these elements\ntoposort hasPrefix [ \"other\" \"/home/user\" \"/home\" \"/\" ]\n == { result = [ \"other\" \"/\" \"/home\" \"/home/user\" ]; }\ntoposort (a: b: a < b) [ 3 2 1 ] == { result = [ 1 2 3 ]; }\n```\n\n# Arguments\n\n- [before] \n- [list] \n\n",
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"content": "\nRemove duplicate elements from the list. O(n^2) complexity.\n\n# Example\n\n```nix\nunique [ 3 2 3 4 ]\n=> [ 3 2 4 ]\n```\n\n# Type\n\n```\nunique :: [a] -> [a]\n```\n",
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"path": ["lib", "mergeAttrBy", "propagatedBuildInputs"],
"pos_type": "Lambda"
}
},
"content": {
"content": "\nConcatenate two lists\n\n# Example\n\n```nix\nconcat [ 1 2 ] [ 3 4 ]\n=> [ 1 2 3 4 ]\n```\n\n# Type\n\n```\nconcat :: [a] -> [a] -> [a]\n```\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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},
{
"meta": {
"title": "lib.meta.addMetaAttrs",
"path": ["lib", "meta", "addMetaAttrs"],
"aliases": [["lib", "addMetaAttrs"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 27,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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},
"path": ["lib", "meta", "addMetaAttrs"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nAdd to or override the meta attributes of the given\nderivation.\n\n# Example\n\n```nix\naddMetaAttrs {description = \"Bla blah\";} somePkg\n```\n\n# Arguments\n\n- [newAttrs] \n- [drv] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 27,
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"path": ["lib", "meta", "addMetaAttrs"],
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},
{
"meta": {
"title": "lib.meta.appendToName",
"path": ["lib", "meta", "appendToName"],
"aliases": [["lib", "appendToName"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 82,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 82,
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"path": ["lib", "meta", "appendToName"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nAppend a suffix to the name of a package (before the version\npart).\n\n# Arguments\n\n- [suffix] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 82,
"column": 3
},
"path": ["lib", "meta", "appendToName"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.meta.availableOn",
"path": ["lib", "meta", "availableOn"],
"aliases": [],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 179,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 179,
"column": 17
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"content_meta": {
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"line": 179,
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"path": ["lib", "meta", "availableOn"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nCheck if a package is available on a given platform.\nA package is available on a platform if both\n1. One of `meta.platforms` pattern matches the given\nplatform, or `meta.platforms` is not present.\n2. None of `meta.badPlatforms` pattern matches the given platform.\n\n# Arguments\n\n- [platform] \n- [pkg] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 179,
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"path": ["lib", "meta", "availableOn"],
"pos_type": "Attribute"
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}
},
{
"meta": {
"title": "lib.meta.dontDistribute",
"path": ["lib", "meta", "dontDistribute"],
"aliases": [
["lib", "dontDistribute"],
["pkgs", "haskell", "lib", "dontDistribute"]
],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 39,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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},
"path": ["lib", "meta", "dontDistribute"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nDisable Hydra builds of given derivation.\n\n# Arguments\n\n- [drv] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 39,
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"path": ["lib", "meta", "dontDistribute"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.meta.getExe",
"path": ["lib", "meta", "getExe"],
"aliases": [["lib", "getExe"]],
"signature": "getExe :: package -> string\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 240,
"column": 3
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"line": 240,
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"path": ["lib", "meta", "getExe"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nGet the path to the main program of a package based on meta.mainProgram\n\n# Example\n\n```nix\ngetExe pkgs.hello\n=> \"/nix/store/g124820p9hlv4lj8qplzxw1c44dxaw1k-hello-2.12/bin/hello\"\ngetExe pkgs.mustache-go\n=> \"/nix/store/am9ml4f4ywvivxnkiaqwr0hyxka1xjsf-mustache-go-1.3.0/bin/mustache\"\n```\n\n# Type\n\n```\ngetExe :: package -> string\n```\n\n# Arguments\n\n- [x] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 240,
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},
"path": ["lib", "meta", "getExe"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.meta.getExe' (Prime)",
"path": ["lib", "meta", "getExe'"],
"aliases": [["lib", "getExe'"]],
"signature": "getExe' :: derivation -> string -> string\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 275,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 275,
"column": 13
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"count_applied": 0,
"content_meta": {
"position": {
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"line": 275,
"column": 3
},
"path": ["lib", "meta", "getExe'"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nGet the path of a program of a derivation.\n\n# Example\n\n```nix\ngetExe' pkgs.hello \"hello\"\n=> \"/nix/store/g124820p9hlv4lj8qplzxw1c44dxaw1k-hello-2.12/bin/hello\"\ngetExe' pkgs.imagemagick \"convert\"\n=> \"/nix/store/5rs48jamq7k6sal98ymj9l4k2bnwq515-imagemagick-7.1.1-15/bin/convert\"\n```\n\n# Type\n\n```\ngetExe' :: derivation -> string -> string\n```\n\n# Arguments\n\n- [x] \n- [y] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 275,
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},
"path": ["lib", "meta", "getExe'"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.meta.getLicenseFromSpdxId",
"path": ["lib", "meta", "getLicenseFromSpdxId"],
"aliases": [["lib", "getLicenseFromSpdxId"]],
"signature": "getLicenseFromSpdxId :: str -> AttrSet\n",
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 207,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 211,
"column": 8
},
"count_applied": 0,
"content_meta": {
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"line": 207,
"column": 3
},
"path": ["lib", "meta", "getLicenseFromSpdxId"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nGet the corresponding attribute in lib.licenses\nfrom the SPDX ID.\nFor SPDX IDs, see\nhttps://spdx.org/licenses\n\n# Example\n\n```nix\nlib.getLicenseFromSpdxId \"MIT\" == lib.licenses.mit\n=> true\nlib.getLicenseFromSpdxId \"mIt\" == lib.licenses.mit\n=> true\nlib.getLicenseFromSpdxId \"MY LICENSE\"\n=> trace: warning: getLicenseFromSpdxId: No license matches the given SPDX ID: MY LICENSE\n=> { shortName = \"MY LICENSE\"; }\n```\n\n# Type\n\n```\ngetLicenseFromSpdxId :: str -> AttrSet\n```\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 207,
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},
"path": ["lib", "meta", "getLicenseFromSpdxId"],
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}
}
},
{
"meta": {
"title": "lib.meta.hiPrio",
"path": ["lib", "meta", "hiPrio"],
"aliases": [
["lib", "hiPrio"],
["pkgs", "hiPrio"]
],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 128,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 27,
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"count_applied": 1,
"content_meta": {
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"line": 128,
"column": 3
},
"path": ["lib", "meta", "hiPrio"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nIncrease the nix-env priority of the package, i.e., this\nversion/variant of the package will be preferred.\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 128,
"column": 3
},
"path": ["lib", "meta", "hiPrio"],
"pos_type": "Attribute"
}
}
},
{
"meta": {
"title": "lib.meta.hiPrioSet",
"path": ["lib", "meta", "hiPrioSet"],
"aliases": [["lib", "hiPrioSet"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 138,
"column": 3
},
"lambda_position": {
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"line": 138,
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"line": 138,
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},
"path": ["lib", "meta", "hiPrioSet"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nApply hiPrio to an attrset with derivations\n\n# Arguments\n\n- [set] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"path": ["lib", "meta", "hiPrioSet"],
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}
}
},
{
"meta": {
"title": "lib.meta.lowPrio",
"path": ["lib", "meta", "lowPrio"],
"aliases": [
["lib", "lowPrio"],
["pkgs", "lowPrio"]
],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 111,
"column": 3
},
"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 27,
"column": 28
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"count_applied": 1,
"content_meta": {
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"line": 111,
"column": 3
},
"path": ["lib", "meta", "lowPrio"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nDecrease the nix-env priority of the package, i.e., other\nversions/variants of the package will be preferred.\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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},
{
"meta": {
"title": "lib.meta.lowPrioSet",
"path": ["lib", "meta", "lowPrioSet"],
"aliases": [["lib", "lowPrioSet"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 121,
"column": 3
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 121,
"column": 16
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"count_applied": 0,
"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 121,
"column": 3
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"path": ["lib", "meta", "lowPrioSet"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nApply lowPrio to an attrset with derivations\n\n# Arguments\n\n- [set] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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},
{
"meta": {
"title": "lib.meta.mapDerivationAttrset",
"path": ["lib", "meta", "mapDerivationAttrset"],
"aliases": [["lib", "mapDerivationAttrset"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 95,
"column": 3
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"count_applied": 0,
"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 95,
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"path": ["lib", "meta", "mapDerivationAttrset"],
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}
},
"content": {
"content": "\nApply a function to each derivation and only to derivations in an attrset.\n\n# Arguments\n\n- [f] \n- [set] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"meta": {
"title": "lib.meta.platformMatch",
"path": ["lib", "meta", "platformMatch"],
"aliases": [],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"lambda_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 157,
"column": 19
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"count_applied": 0,
"content_meta": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
"line": 157,
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"path": ["lib", "meta", "platformMatch"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nCheck to see if a platform is matched by the given `meta.platforms`\nelement.\nA `meta.platform` pattern is either\n1. (legacy) a system string.\n2. (modern) a pattern for the entire platform structure (see `lib.systems.inspect.platformPatterns`).\n3. (modern) a pattern for the platform `parsed` field (see `lib.systems.inspect.patterns`).\nWe can inject these into a pattern for the whole of a structured platform,\nand then match that.\n\n# Arguments\n\n- [platform] \n- [elem] \n\n",
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"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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},
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"meta": {
"title": "lib.meta.setName",
"path": ["lib", "meta", "setName"],
"aliases": [["lib", "setName"]],
"signature": null,
"is_primop": false,
"primop_meta": null,
"attr_position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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"lambda_position": {
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"path": ["lib", "meta", "setName"],
"pos_type": "Attribute"
}
},
"content": {
"content": "\nChange the symbolic name of a package for presentation purposes\n(i.e., so that nix-env users can tell them apart).\n\n# Arguments\n\n- [name] \n- [drv] \n\n",
"source": {
"position": {
"file": "/nix/store/mdy5n400sl4dn12kjkrkwnxqfbzahpld-nixpkgs-migrated/lib/meta.nix",
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}
},
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"meta": {
"title": "lib.meta.setPrio",
"path": ["lib", "meta", "setPrio"],
"aliases": [["lib", "setPrio"]],
"signature": null,
"is_primop": false,
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"content": "\nGiven a config value, expand mkMerge properties, and discharge\nany mkIf conditions. That is, this is the place where mkIf\nconditions are actually evaluated. The result is a list of\nconfig values. For example, ‘mkIf false x’ yields ‘[]’,\n‘mkIf true x’ yields ‘[x]’, and\nmkMerge [ 1 (mkIf true 2) (mkIf true (mkIf false 3)) ]\nyields ‘[ 1 2 ]’.\n\n# Arguments\n\n- [def] \n\n",
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"content": "\nSee https://nixos.org/manual/nixpkgs/unstable/#module-system-lib-evalModules\nor file://./../doc/module-system/module-system.chapter.md\n!!! Please think twice before adding to this argument list! The more\nthat is specified here instead of in the modules themselves the harder\nit is to transparently move a set of modules to be a submodule of another\nconfig (as the proper arguments need to be replicated at each call to\nevalModules) and the less declarative the module set is.\n\n# Arguments\n\n\n",
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"content": {
"content": "\nMerge all the definitions of an option to produce the final\nconfig value.\n\n# Arguments\n\n- [loc] \n- [opt] \n- [defs] \n\n",
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"content": "\nGiven a list of config values, process the mkOverride properties,\nthat is, return the values that have the highest (that is,\nnumerically lowest) priority, and strip the mkOverride\nproperties. For example,\n[ { file = \"/1\"; value = mkOverride 10 \"a\"; }\n{ file = \"/2\"; value = mkOverride 20 \"b\"; }\n{ file = \"/3\"; value = \"z\"; }\n{ file = \"/4\"; value = mkOverride 10 \"d\"; }\n]\nyields\n[ { file = \"/1\"; value = \"a\"; }\n{ file = \"/4\"; value = \"d\"; }\n]\nNote that \"z\" has the default priority 100.\n\n# Arguments\n\n- [defs] \n\n",
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"content": "\nCompatibility.\n\n# Arguments\n\n- [modules] \n- [args] \n\n",
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"path": ["lib", "modules", "importJSON"],
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"content": "\nReads a TOML file.\n\n# Type\n\n```\nimportTOML :: path -> any\n```\n\n# Arguments\n\n- [path] \n\n",
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"signature": "option -> attrsOf { highestPrio, value }\n",
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"content": {
"content": "\nMerge an option's definitions in a way that preserves the priority of the\nindividual attributes in the option value.\nThis does not account for all option semantics, such as readOnly.\n\n# Type\n\n```\noption -> attrsOf { highestPrio, value }\n```\n\n# Arguments\n\n- [opt] \n\n",
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"content": {
"content": "\nMerge a list of modules. This will recurse over the option\ndeclarations in all modules, combining them into a single set.\nAt the same time, for each option declaration, it will merge the\ncorresponding option definitions in all machines, returning them\nin the ‘value’ attribute of each option.\nThis returns a set like\n{\n# A recursive set of options along with their final values\nmatchedOptions = {\nfoo = { _type = \"option\"; value = \"option value of foo\"; ... };\nbar.baz = { _type = \"option\"; value = \"option value of bar.baz\"; ... };\n...\n};\n# A list of definitions that weren't matched by any option\nunmatchedDefns = [\n{ file = \"file.nix\"; prefix = [ \"qux\" ]; value = \"qux\"; }\n...\n];\n}\n\n# Arguments\n\n- [prefix] \n- [modules] \n\n",
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"content": "\nMerge multiple option declarations into a single declaration. In\ngeneral, there should be only one declaration of each option.\nThe exception is the ‘options’ attribute, which specifies\nsub-options. These can be specified multiple times to allow one\nmodule to add sub-options to an option declared somewhere else\n(e.g. multiple modules define sub-options for ‘fileSystems’).\n'loc' is the list of attribute names where the option is located.\n'opts' is a list of modules. Each module has an options attribute which\ncorrespond to the definition of 'loc' in 'opt.file'.\n\n# Arguments\n\n- [loc] \n- [opts] \n\n",
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"content": "\n\"Merge\" option definitions by checking that they all have the same value.\n\n# Arguments\n\n- [loc] \n- [defs] \n\n",
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"content": "\nCreates an Option attribute set for a boolean value option i.e an\noption to be toggled on or off:\n\n# Example\n\n```nix\nmkEnableOption \"foo\"\n=> { _type = \"option\"; default = false; description = \"Whether to enable foo.\"; example = true; type = { ... }; }\n```\n\n# Arguments\n\n- [name] Name for the created option\n\n",
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"content": "\nCreates an Option attribute set. mkOption accepts an attribute set with the following keys:\nAll keys default to `null` when not given.\n\n# Example\n\n```nix\nmkOption { } // => { _type = \"option\"; }\nmkOption { default = \"foo\"; } // => { _type = \"option\"; default = \"foo\"; }\n```\n\n# Arguments\n\n\n",
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"content": "\nCreates an Option attribute set for an option that specifies the\npackage a module should use for some purpose.\nThe package is specified in the third argument under `default` as a list of strings\nrepresenting its attribute path in nixpkgs (or another package set).\nBecause of this, you need to pass nixpkgs itself (usually `pkgs` in a module;\nalternatively to nixpkgs itself, another package set) as the first argument.\nIf you pass another package set you should set the `pkgsText` option.\nThis option is used to display the expression for the package set. It is `\"pkgs\"` by default.\nIf your expression is complex you should parenthesize it, as the `pkgsText` argument\nis usually immediately followed by an attribute lookup (`.`).\nThe second argument may be either a string or a list of strings.\nIt provides the display name of the package in the description of the generated option\n(using only the last element if the passed value is a list)\nand serves as the fallback value for the `default` argument.\nTo include extra information in the description, pass `extraDescription` to\nappend arbitrary text to the generated description.\nYou can also pass an `example` value, either a literal string or an attribute path.\nThe `default` argument can be omitted if the provided name is\nan attribute of pkgs (if `name` is a string) or a valid attribute path in pkgs (if `name` is a list).\nYou can also set `default` to just a string in which case it is interpreted as an attribute name\n(a singleton attribute path, if you will).\nIf you wish to explicitly provide no default, pass `null` as `default`.\nIf you want users to be able to set no package, pass `nullable = true`.\nIn this mode a `default = null` will not be interpreted as no default and is interpreted literally.\n\n# Example\n\n```nix\nmkPackageOption pkgs \"hello\" { }\n=> { ...; default = pkgs.hello; defaultText = literalExpression \"pkgs.hello\"; description = \"The hello package to use.\"; type = package; }\nmkPackageOption pkgs \"GHC\" {\n default = [ \"ghc\" ];\n example = \"pkgs.haskell.packages.ghc92.ghc.withPackages (hkgs: [ hkgs.primes ])\";\n}\n=> { ...; default = pkgs.ghc; defaultText = literalExpression \"pkgs.ghc\"; description = \"The GHC package to use.\"; example = literalExpression \"pkgs.haskell.packages.ghc92.ghc.withPackages (hkgs: [ hkgs.primes ])\"; type = package; }\nmkPackageOption pkgs [ \"python3Packages\" \"pytorch\" ] {\n extraDescription = \"This is an example and doesn't actually do anything.\";\n}\n=> { ...; default = pkgs.python3Packages.pytorch; defaultText = literalExpression \"pkgs.python3Packages.pytorch\"; description = \"The pytorch package to use. This is an example and doesn't actually do anything.\"; type = package; }\nmkPackageOption pkgs \"nushell\" {\n nullable = true;\n}\n=> { ...; default = pkgs.nushell; defaultText = literalExpression \"pkgs.nushell\"; description = \"The nushell package to use.\"; type = nullOr package; }\nmkPackageOption pkgs \"coreutils\" {\n default = null;\n}\n=> { ...; description = \"The coreutils package to use.\"; type = package; }\nmkPackageOption pkgs \"dbus\" {\n nullable = true;\n default = null;\n}\n=> { ...; default = null; description = \"The dbus package to use.\"; type = nullOr package; }\nmkPackageOption pkgs.javaPackages \"OpenJFX\" {\n default = \"openjfx20\";\n pkgsText = \"pkgs.javaPackages\";\n}\n=> { ...; default = pkgs.javaPackages.openjfx20; defaultText = literalExpression \"pkgs.javaPackages.openjfx20\"; description = \"The OpenJFX package to use.\"; type = package; }\n```\n\n# Type\n\n```\nmkPackageOption :: pkgs -> (string|[string]) -> { nullable? :: bool, default? :: string|[string], example? :: null|string|[string], extraDescription? :: string, pkgsText? :: string } -> option\n```\n\n# Arguments\n\n- [pkgs] Package set (an instantiation of nixpkgs such as pkgs in modules or another package set)\n- [name] Name for the package, shown in option description\n\n",
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"content": "\nAlias of mkPackageOption. Previously used to create options with markdown\ndocumentation, which is no longer required.\n",
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"content": "\nThis option accepts anything, but it does not produce any result.\nThis is useful for sharing a module across different module sets\nwithout having to implement similar features as long as the\nvalues of the options are not accessed.\n\n# Arguments\n\n- [attrs] \n\n",
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"content": "\nEnsures that the given option value (default or example) is a `_type`d string\nby rendering Nix values to `literalExpression`s.\n\n# Arguments\n\n- [v] \n\n",
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"title": "lib.options.showOption",
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"content": "\nConvert an option, described as a list of the option parts to a\nhuman-readable version.\n\n# Example\n\n```nix\n(showOption [\"foo\" \"bar\" \"baz\"]) == \"foo.bar.baz\"\n (showOption [\"foo\" \"bar.baz\" \"tux\"]) == \"foo.\\\"bar.baz\\\".tux\"\n (showOption [\"windowManager\" \"2bwm\" \"enable\"]) == \"windowManager.\\\"2bwm\\\".enable\"\nPlaceholders will not be quoted as they are not actual values:\n (showOption [\"foo\" \"*\" \"bar\"]) == \"foo.*.bar\"\n (showOption [\"foo\" \"<name>\" \"bar\"]) == \"foo.<name>.bar\"\n```\n\n# Arguments\n\n- [parts] \n\n",
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"content": "\nAppend a subpath string to a path.\nLike `path + (\"/\" + string)` but safer, because it errors instead of returning potentially surprising results.\nMore specifically, it checks that the first argument is a [path value type](https://nixos.org/manual/nix/stable/language/values.html#type-path\"),\nand that the second argument is a [valid subpath string](#function-library-lib.path.subpath.isValid).\nLaws:\n- Not influenced by subpath [normalisation](#function-library-lib.path.subpath.normalise):\nappend p s == append p (subpath.normalise s)\n\n# Example\n\n```nix\nappend /foo \"bar/baz\"\n=> /foo/bar/baz\n# subpaths don't need to be normalised\nappend /foo \"./bar//baz/./\"\n=> /foo/bar/baz\n# can append to root directory\nappend /. \"foo/bar\"\n=> /foo/bar\n# first argument needs to be a path value type\nappend \"/foo\" \"bar\"\n=> <error>\n# second argument needs to be a valid subpath string\nappend /foo /bar\n=> <error>\nappend /foo \"\"\n=> <error>\nappend /foo \"/bar\"\n=> <error>\nappend /foo \"../bar\"\n=> <error>\n```\n\n# Type\n\n```\nappend :: Path -> String -> Path\n```\n\n# Arguments\n\n- [path] The absolute path to append to\n- [subpath] The subpath string to append\n\n",
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"content": {
"content": "\nWhether the first path is a component-wise prefix of the second path.\nLaws:\n- `hasPrefix p q` is only true if [`q == append p s`](#function-library-lib.path.append) for some [subpath](#function-library-lib.path.subpath.isValid) `s`.\n- `hasPrefix` is a [non-strict partial order](https://en.wikipedia.org/wiki/Partially_ordered_set#Non-strict_partial_order) over the set of all path values.\n\n# Example\n\n```nix\nhasPrefix /foo /foo/bar\n=> true\nhasPrefix /foo /foo\n=> true\nhasPrefix /foo/bar /foo\n=> false\nhasPrefix /. /foo\n=> true\n```\n\n# Type\n\n```\nhasPrefix :: Path -> Path -> Bool\n```\n\n# Arguments\n\n- [path1] \n\n",
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"content": {
"content": "\nRemove the first path as a component-wise prefix from the second path.\nThe result is a [normalised subpath string](#function-library-lib.path.subpath.normalise).\nLaws:\n- Inverts [`append`](#function-library-lib.path.append) for [normalised subpath string](#function-library-lib.path.subpath.normalise):\nremovePrefix p (append p s) == subpath.normalise s\n\n# Example\n\n```nix\nremovePrefix /foo /foo/bar/baz\n=> \"./bar/baz\"\nremovePrefix /foo /foo\n=> \"./.\"\nremovePrefix /foo/bar /foo\n=> <error>\nremovePrefix /. /foo\n=> \"./foo\"\n```\n\n# Type\n\n```\nremovePrefix :: Path -> Path -> String\n```\n\n# Arguments\n\n- [path1] \n\n",
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"meta": {
"title": "lib.path.splitRoot",
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"signature": "splitRoot :: Path -> { root :: Path, subpath :: String }\n",
"is_primop": false,
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"content": {
"content": "\nSplit the filesystem root from a [path](https://nixos.org/manual/nix/stable/language/values.html#type-path).\nThe result is an attribute set with these attributes:\n- `root`: The filesystem root of the path, meaning that this directory has no parent directory.\n- `subpath`: The [normalised subpath string](#function-library-lib.path.subpath.normalise) that when [appended](#function-library-lib.path.append) to `root` returns the original path.\nLaws:\n- [Appending](#function-library-lib.path.append) the `root` and `subpath` gives the original path:\np ==\nappend\n(splitRoot p).root\n(splitRoot p).subpath\n- Trying to get the parent directory of `root` using [`readDir`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-readDir) returns `root` itself:\ndirOf (splitRoot p).root == (splitRoot p).root\n\n# Example\n\n```nix\nsplitRoot /foo/bar\n=> { root = /.; subpath = \"./foo/bar\"; }\nsplitRoot /.\n=> { root = /.; subpath = \"./.\"; }\n# Nix neutralises `..` path components for all path values automatically\nsplitRoot /foo/../bar\n=> { root = /.; subpath = \"./bar\"; }\nsplitRoot \"/foo/bar\"\n=> <error>\n```\n\n# Type\n\n```\nsplitRoot :: Path -> { root :: Path, subpath :: String }\n```\n\n# Arguments\n\n- [path] The path to split the root off of\n\n",
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"title": "lib.sources.cleanSource",
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"content": "\nFilters a source tree removing version control files and directories using cleanSourceFilter.\n\n# Example\n\n```nix\ncleanSource ./.\n```\n\n# Arguments\n\n- [src] \n\n",
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"content": "\nA basic filter for `cleanSourceWith` that removes\ndirectories of version control system, backup files (*~)\nand some generated files.\n\n# Arguments\n\n- [name] \n- [type] \n\n",
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"title": "lib.sources.cleanSourceWith",
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"content": "\nLike `builtins.filterSource`, except it will compose with itself,\nallowing you to chain multiple calls together without any\nintermediate copies being put in the nix store.\n\n# Example\n\n```nix\nlib.cleanSourceWith {\n filter = f;\n src = lib.cleanSourceWith {\n filter = g;\n src = ./.;\n };\n}\n# Succeeds!\nbuiltins.filterSource f (builtins.filterSource g ./.)\n# Fails!\n```\n\n# Arguments\n\n\n",
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},
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"meta": {
"title": "lib.sources.commitIdFromGitRepo",
"path": ["lib", "sources", "commitIdFromGitRepo"],
"aliases": [["lib", "commitIdFromGitRepo"]],
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"content": "\nGet the commit id of a git repo.\n\n# Example\n\n```nix\ncommitIdFromGitRepo <nixpkgs/.git>\n```\n\n# Arguments\n\n- [path] \n\n",
"source": {
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"meta": {
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"content": {
"content": "\nReturn `true` if string *s* has a non-empty context. The\ncontext can be obtained with\n[`getContext`](#builtins-getContext).\n",
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"content": "\nWhether a path exists and is a directory.\n\n# Example\n\n```nix\npathIsDirectory /.\n=> true\npathIsDirectory /this/does/not/exist\n=> false\npathIsDirectory /some/file.nix\n=> false\n```\n\n# Type\n\n```\npathIsDirectory :: Path -> Bool\n```\n\n# Arguments\n\n- [path] \n\n",
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"content": "\nThe type of a path. The path needs to exist and be accessible.\nThe result is either \"directory\" for a directory, \"regular\" for a regular file, \"symlink\" for a symlink, or \"unknown\" for anything else.\n\n# Example\n\n```nix\npathType /.\n=> \"directory\"\npathType /some/file.nix\n=> \"regular\"\n```\n\n# Type\n\n```\npathType :: Path -> String\n```\n",
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"content": "\nFilter sources by a list of regular expressions.\n\n# Example\n\n```nix\nsrc = sourceByRegex ./my-subproject [\".*\\.py$\" \"^database.sql$\"]\n```\n\n# Arguments\n\n- [src] \n- [regexes] \n\n",
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"content": "\nGet all files ending with the specified suffices from the given\nsource directory or its descendants, omitting files that do not match\nany suffix. The result of the example below will include files like\n`./dir/module.c` and `./dir/subdir/doc.xml` if present.\n\n# Example\n\n```nix\nsourceFilesBySuffices ./. [ \".xml\" \".c\" ]\n```\n\n# Type\n\n```\nsourceLike -> [String] -> Source\n```\n\n# Arguments\n\n- [src] Path or source containing the files to be returned\n- [exts] A list of file suffix strings\n\n",
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"content": "\nIncrementally evaluate and trace a file set in a pretty way.\nThis function is only intended for debugging purposes.\nThe exact tracing format is unspecified and may change.\nThis function takes a final argument to return.\nIn comparison, [`traceVal`](#function-library-lib.fileset.traceVal) returns\nthe given file set argument.\nThis variant is useful for tracing file sets in the Nix repl.\n\n# Example\n\n```nix\ntrace (unions [ ./Makefile ./src ./tests/run.sh ]) null\n=>\ntrace: /home/user/src/myProject\ntrace: - Makefile (regular)\ntrace: - src (all files in directory)\ntrace: - tests\ntrace: - run.sh (regular)\nnull\n```\n\n# Type\n\n```\ntrace :: FileSet -> Any -> Any\n```\n\n# Arguments\n\n- [fileset] The file set to trace. \n This argument can also be a path,\n which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).\n\n\n",
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"content": "\nAppends string context from another string. This is an implementation\ndetail of Nix and should be used carefully.\nStrings in Nix carry an invisible `context` which is a list of strings\nrepresenting store paths. If the string is later used in a derivation\nattribute, the derivation will properly populate the inputDrvs and\ninputSrcs.\n\n# Example\n\n```nix\npkgs = import <nixpkgs> { };\naddContextFrom pkgs.coreutils \"bar\"\n=> \"bar\"\n```\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"content": "\nConvert char to ascii value, must be in printable range\n\n# Example\n\n```nix\ncharToInt \"A\"\n=> 65\ncharToInt \"(\"\n=> 40\n```\n\n# Type\n\n```\ncharToInt :: string -> int\n```\n\n# Arguments\n\n- [c] \n\n",
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"content": "\nCreate a -D<condition>={TRUE,FALSE} string that can be passed to typical\nCMake invocations.\n\n# Example\n\n```nix\ncmakeBool \"ENABLE_STATIC_LIBS\" false\n=> \"-DENABLESTATIC_LIBS:BOOL=FALSE\"\n```\n\n# Type\n\n```\ncmakeBool :: string -> bool -> string\n @param condition The condition to be made true or false\n @param flag The controlling flag of the condition\n```\n\n# Arguments\n\n- [condition] \n- [flag] \n\n",
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"content": "\nCreate a -D<feature>:STRING=<value> string that can be passed to typical\nCMake invocations.\nThis is the most typical usage, so it deserves a special case.\n\n# Example\n\n```nix\ncmakeFeature \"MODULES\" \"badblock\"\n=> \"-DMODULES:STRING=badblock\"\n```\n\n# Type\n\n```\ncmakeFeature :: string -> string -> string\n @param condition The condition to be made true or false\n @param flag The controlling flag of the condition\n```\n\n# Arguments\n\n- [feature] \n- [value] \n\n",
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"content": "\nCreate a \"-D<feature>:<type>=<value>\" string that can be passed to typical\nCMake invocations.\n\n# Example\n\n```nix\ncmakeOptionType \"string\" \"ENGINE\" \"sdl2\"\n=> \"-DENGINE:STRING=sdl2\"\n```\n\n# Type\n\n```\ncmakeOptionType :: string -> string -> string -> string\n @param feature The feature to be set\n @param type The type of the feature to be set, as described in\n https://cmake.org/cmake/help/latest/command/set.html\n the possible values (case insensitive) are:\n BOOL FILEPATH PATH STRING INTERNAL\n @param value The desired value\n```\n\n# Arguments\n\n- [type] \n- [feature] \n- [value] \n\n",
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"content": "\nReturns the length of the prefix common to both strings.\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"content": "\nReturns the length of the suffix common to both strings.\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"content": "\nCompare two strings representing versions and return `-1` if\nversion *s1* is older than version *s2*, `0` if they are the same,\nand `1` if *s1* is newer than *s2*. The version comparison\nalgorithm is the same as the one used by [`nix-env\n-u`](../command-ref/nix-env.md#operation---upgrade).\n",
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"content": "\nCheck whether a value can be coerced to a string.\nThe value must be a string, path, or attribute set.\nString-like values can be used without explicit conversion in\nstring interpolations and in most functions that expect a string.\n\n# Arguments\n\n- [x] \n\n",
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"content": "\nTest whether the given name is a valid POSIX shell variable name.\n\n# Example\n\n```nix\nisValidPosixName \"foo_bar000\"\n=> true\nisValidPosixName \"0-bad.jpg\"\n=> false\n```\n\n# Type\n\n```\nstring -> bool\n```\n\n# Arguments\n\n- [name] \n\n",
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"content": "\nComputes the Levenshtein distance between two strings.\nComplexity O(n*m) where n and m are the lengths of the strings.\nAlgorithm adjusted from https://stackoverflow.com/a/9750974/6605742\n\n# Example\n\n```nix\nlevenshtein \"foo\" \"foo\"\n=> 0\nlevenshtein \"book\" \"hook\"\n=> 1\nlevenshtein \"hello\" \"Heyo\"\n=> 3\n```\n\n# Type\n\n```\nlevenshtein :: string -> string -> int\n```\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"content": "\nReturns whether the levenshtein distance between two strings is at most some value\nComplexity is O(min(n,m)) for k <= 2 and O(n*m) otherwise\n\n# Example\n\n```nix\nlevenshteinAtMost 0 \"foo\" \"foo\"\n=> true\nlevenshteinAtMost 1 \"foo\" \"boa\"\n=> false\nlevenshteinAtMost 2 \"foo\" \"boa\"\n=> true\nlevenshteinAtMost 2 \"This is a sentence\" \"this is a sentense.\"\n=> false\nlevenshteinAtMost 3 \"This is a sentence\" \"this is a sentense.\"\n=> true\n```\n\n# Type\n\n```\nlevenshteinAtMost :: int -> string -> string -> bool\n```\n",
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"content": "\nConstruct a library search path (such as RPATH) containing the\nlibraries for a set of packages\n\n# Example\n\n```nix\nmakeLibraryPath [ \"/usr\" \"/usr/local\" ]\n=> \"/usr/lib:/usr/local/lib\"\npkgs = import <nixpkgs> { }\nmakeLibraryPath [ pkgs.openssl pkgs.zlib ]\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r/lib:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/lib\"\n```\n",
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"content": "\nConstruct a Unix-style, colon-separated search path consisting of\nthe given `subDir` appended to each of the given paths.\n\n# Example\n\n```nix\nmakeSearchPath \"bin\" [\"/root\" \"/usr\" \"/usr/local\"]\n=> \"/root/bin:/usr/bin:/usr/local/bin\"\nmakeSearchPath \"bin\" [\"\"]\n=> \"/bin\"\n```\n\n# Type\n\n```\nmakeSearchPath :: string -> [string] -> string\n```\n\n# Arguments\n\n- [subDir] Directory name to append\n- [paths] List of base paths\n\n",
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"content": "\nConstruct a Unix-style search path by appending the given\n`subDir` to the specified `output` of each of the packages. If no\noutput by the given name is found, fallback to `.out` and then to\nthe default.\n\n# Example\n\n```nix\nmakeSearchPathOutput \"dev\" \"bin\" [ pkgs.openssl pkgs.zlib ]\n=> \"/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev/bin:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/bin\"\n```\n\n# Type\n\n```\nstring -> string -> [package] -> string\n```\n\n# Arguments\n\n- [output] Package output to use\n- [subDir] Directory name to append\n- [pkgs] List of packages\n\n",
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"content": "\nReturns a list if the [extended POSIX regular\nexpression](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04)\n*regex* matches *str* precisely, otherwise returns `null`. Each item\nin the list is a regex group.\n\n```nix\nbuiltins.match \"ab\" \"abc\"\n```\n\nEvaluates to `null`.\n\n```nix\nbuiltins.match \"abc\" \"abc\"\n```\n\nEvaluates to `[ ]`.\n\n```nix\nbuiltins.match \"a(b)(c)\" \"abc\"\n```\n\nEvaluates to `[ \"b\" \"c\" ]`.\n\n```nix\nbuiltins.match \"[[:space:]]+([[:upper:]]+)[[:space:]]+\" \" FOO \"\n```\n\nEvaluates to `[ \"FOO\" ]`.\n",
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"content": "\nCreate a -D<condition>={true,false} string that can be passed to typical\nMeson invocations.\n\n# Example\n\n```nix\nmesonBool \"hardened\" true\n=> \"-Dhardened=true\"\nmesonBool \"static\" false\n=> \"-Dstatic=false\"\n```\n\n# Type\n\n```\nmesonBool :: string -> bool -> string\n @param condition The condition to be made true or false\n @param flag The controlling flag of the condition\n```\n\n# Arguments\n\n- [condition] \n- [flag] \n\n",
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"content": "\nCreate a -D<feature>={enabled,disabled} string that can be passed to\ntypical Meson invocations.\n\n# Example\n\n```nix\nmesonEnable \"docs\" true\n=> \"-Ddocs=enabled\"\nmesonEnable \"savage\" false\n=> \"-Dsavage=disabled\"\n```\n\n# Type\n\n```\nmesonEnable :: string -> bool -> string\n @param feature The feature to be enabled or disabled\n @param flag The controlling flag\n```\n\n# Arguments\n\n- [feature] \n- [flag] \n\n",
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"content": "\nCreate a -D<feature>=<value> string that can be passed to typical Meson\ninvocations.\n\n# Example\n\n```nix\nmesonOption \"engine\" \"opengl\"\n=> \"-Dengine=opengl\"\n```\n\n# Type\n\n```\nmesonOption :: string -> string -> string\n @param feature The feature to be set\n @param value The desired value\n```\n\n# Arguments\n\n- [feature] \n- [value] \n\n",
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"content": "\nExtract name with version from URL. Ask for separator which is\nsupposed to start extension.\n\n# Example\n\n```nix\nnameFromURL \"https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2\" \"-\"\n=> \"nix\"\nnameFromURL \"https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2\" \"_\"\n=> \"nix-1.7-x86\"\n```\n\n# Arguments\n\n- [url] \n- [sep] \n\n",
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"content": "\nNormalize path, removing extraneous /s\n\n# Example\n\n```nix\nnormalizePath \"/a//b///c/\"\n=> \"/a/b/c/\"\n```\n\n# Type\n\n```\nnormalizePath :: string -> string\n```\n\n# Arguments\n\n- [s] \n\n",
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"content": "\nDepending on the boolean `cond', return either the given string\nor the empty string. Useful to concatenate against a bigger string.\n\n# Example\n\n```nix\noptionalString true \"some-string\"\n=> \"some-string\"\noptionalString false \"some-string\"\n=> \"\"\n```\n\n# Type\n\n```\noptionalString :: bool -> string -> string\n```\n\n# Arguments\n\n- [cond] Condition\n- [string] String to return if condition is true\n\n",
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"content": "\nSplit the string *s* into a package name and version. The package\nname is everything up to but not including the first dash not followed\nby a letter, and the version is everything following that dash. The\nresult is returned in a set `{ name, version }`. Thus,\n`builtins.parseDrvName \"nix-0.12pre12876\"` returns `{ name =\n\"nix\"; version = \"0.12pre12876\"; }`.\n",
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"content": {
"content": "\nReturn the contents of the file *path* as a string.\n",
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"content": "\nRead a list of paths from `file`, relative to the `rootPath`.\nLines beginning with `#` are treated as comments and ignored.\nWhitespace is significant.\nNOTE: This function is not performant and should be avoided.\n\n# Example\n\n```nix\nreadPathsFromFile /prefix\n ./pkgs/development/libraries/qt-5/5.4/qtbase/series\n=> [ \"/prefix/dlopen-resolv.patch\" \"/prefix/tzdir.patch\"\n \"/prefix/dlopen-libXcursor.patch\" \"/prefix/dlopen-openssl.patch\"\n \"/prefix/dlopen-dbus.patch\" \"/prefix/xdg-config-dirs.patch\"\n \"/prefix/nix-profiles-library-paths.patch\"\n \"/prefix/compose-search-path.patch\" ]\n```\n",
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"content": "\nReturn a string without the specified prefix, if the prefix matches.\n\n# Example\n\n```nix\nremovePrefix \"foo.\" \"foo.bar.baz\"\n=> \"bar.baz\"\nremovePrefix \"xxx\" \"foo.bar.baz\"\n=> \"foo.bar.baz\"\n```\n\n# Type\n\n```\nstring -> string -> string\n```\n\n# Arguments\n\n- [prefix] Prefix to remove if it matches\n- [str] Input string\n\n",
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"content": "\nCreates a valid derivation name from a potentially invalid one.\n\n# Example\n\n```nix\nsanitizeDerivationName \"../hello.bar # foo\"\n=> \"-hello.bar-foo\"\nsanitizeDerivationName \"\"\n=> \"unknown\"\nsanitizeDerivationName pkgs.hello\n=> \"-nix-store-2g75chlbpxlrqn15zlby2dfh8hr9qwbk-hello-2.10\"\n```\n\n# Type\n\n```\nsanitizeDerivationName :: String -> String\n```\n",
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"content": "\nReturns a list composed of non matched strings interleaved with the\nlists of the [extended POSIX regular\nexpression](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04)\n*regex* matches of *str*. Each item in the lists of matched\nsequences is a regex group.\n\n```nix\nbuiltins.split \"(a)b\" \"abc\"\n```\n\nEvaluates to `[ \"\" [ \"a\" ] \"c\" ]`.\n\n```nix\nbuiltins.split \"([ac])\" \"abc\"\n```\n\nEvaluates to `[ \"\" [ \"a\" ] \"b\" [ \"c\" ] \"\" ]`.\n\n```nix\nbuiltins.split \"(a)|(c)\" \"abc\"\n```\n\nEvaluates to `[ \"\" [ \"a\" null ] \"b\" [ null \"c\" ] \"\" ]`.\n\n```nix\nbuiltins.split \"([[:upper:]]+)\" \" FOO \"\n```\n\nEvaluates to `[ \" \" [ \"FOO\" ] \" \" ]`.\n",
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"content": "\nCut a string with a separator and produces a list of strings which\nwere separated by this separator.\n\n# Example\n\n```nix\nsplitString \".\" \"foo.bar.baz\"\n=> [ \"foo\" \"bar\" \"baz\" ]\nsplitString \"/\" \"/usr/local/bin\"\n=> [ \"\" \"usr\" \"local\" \"bin\" ]\n```\n\n# Arguments\n\n- [sep] \n- [s] \n\n",
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"content": "\nManipulate a string character by character and replace them by\nstrings before concatenating the results.\n\n# Example\n\n```nix\nstringAsChars (x: if x == \"a\" then \"i\" else x) \"nax\"\n=> \"nix\"\n```\n\n# Type\n\n```\nstringAsChars :: (string -> string) -> string -> string\n```\n\n# Arguments\n\n- [f] Function to map over each individual character\n- [s] Input string\n\n",
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"content": "\nReturn the length of the string *e*. If *e* is not a string,\nevaluation is aborted.\n",
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"content": "\nConvert a string to a list of characters (i.e. singleton strings).\nThis allows you to, e.g., map a function over each character. However,\nnote that this will likely be horribly inefficient; Nix is not a\ngeneral purpose programming language. Complex string manipulations\nshould, if appropriate, be done in a derivation.\nAlso note that Nix treats strings as a list of bytes and thus doesn't\nhandle unicode.\n\n# Example\n\n```nix\nstringToCharacters \"\"\n=> [ ]\nstringToCharacters \"abc\"\n=> [ \"a\" \"b\" \"c\" ]\nstringToCharacters \"🦄\"\n=> [ \"<22>\" \"<22>\" \"<22>\" \"<22>\" ]\n```\n\n# Type\n\n```\nstringToCharacters :: string -> [string]\n```\n\n# Arguments\n\n- [s] \n\n",
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"content": "\nReturn the substring of *s* from character position *start*\n(zero-based) up to but not including *start + len*. If *start* is\ngreater than the length of the string, an empty string is returned,\nand if *start + len* lies beyond the end of the string, only the\nsubstring up to the end of the string is returned. *start* must be\nnon-negative. For example,\n\n```nix\nbuiltins.substring 0 3 \"nixos\"\n```\n\nevaluates to `\"nix\"`.\n",
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"content": "\nReturn the list without its first item; abort evaluation if\nthe argument isn’t a list or is an empty list.\n\n> **Warning**\n>\n> This function should generally be avoided since it's inefficient:\n> unlike Haskell's `tail`, it takes O(n) time, so recursing over a\n> list by repeatedly calling `tail` takes O(n^2) time.\n",
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"content": "\nParse a string as an int. Does not support parsing of integers with preceding zero due to\nambiguity between zero-padded and octal numbers. See toIntBase10.\n\n# Example\n\n```nix\ntoInt \"1337\"\n=> 1337\ntoInt \"-4\"\n=> -4\ntoInt \" 123 \"\n=> 123\ntoInt \"00024\"\n=> error: Ambiguity in interpretation of 00024 between octal and zero padded integer.\ntoInt \"3.14\"\n=> error: floating point JSON numbers are not supported\n```\n\n# Type\n\n```\nstring -> int\n```\n\n# Arguments\n\n- [str] \n\n",
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"content": "\nReturn a string containing a JSON representation of *e*. Strings,\nintegers, floats, booleans, nulls and lists are mapped to their JSON\nequivalents. Sets (except derivations) are represented as objects.\nDerivations are translated to a JSON string containing the\nderivation’s output path. Paths are copied to the store and\nrepresented as a JSON string of the resulting store path.\n",
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"content": "\nTranslate a Nix value into a shell variable declaration, with proper escaping.\nThe value can be a string (mapped to a regular variable), a list of strings\n(mapped to a Bash-style array) or an attribute set of strings (mapped to a\nBash-style associative array). Note that \"string\" includes string-coercible\nvalues like paths or derivations.\nStrings are translated into POSIX sh-compatible code; lists and attribute sets\nassume a shell that understands Bash syntax (e.g. Bash or ZSH).\n\n# Example\n\n```nix\n''\n ${toShellVar \"foo\" \"some string\"}\n [[ \"$foo\" == \"some string\" ]]\n''\n```\n\n# Type\n\n```\nstring -> (string | listOf string | attrsOf string) -> string\n```\n\n# Arguments\n\n- [name] \n- [value] \n\n",
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"content": "\nTranslate an attribute set into corresponding shell variable declarations\nusing `toShellVar`.\n\n# Example\n\n```nix\nlet\n foo = \"value\";\n bar = foo;\nin ''\n ${toShellVars { inherit foo bar; }}\n [[ \"$foo\" == \"$bar\" ]]\n''\n```\n\n# Type\n\n```\nattrsOf (string | listOf string | attrsOf string) -> string\n```\n\n# Arguments\n\n- [vars] \n\n",
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"content": "\nReturn true if string v1 denotes a version older than v2.\n\n# Example\n\n```nix\nversionOlder \"1.1\" \"1.2\"\n=> true\nversionOlder \"1.1\" \"1.1\"\n=> false\n```\n\n# Arguments\n\n- [v1] \n- [v2] \n\n",
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"content": "\nCreate an --{with,without}-<feature> string that can be passed to\nstandard GNU Autoconf scripts.\n\n# Example\n\n```nix\nwithFeature true \"shared\"\n=> \"--with-shared\"\nwithFeature false \"shared\"\n=> \"--without-shared\"\n```\n\n# Arguments\n\n- [flag] \n- [feature] \n\n",
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"content": "\n!!! The interface of this function is kind of messed up, since\nit's way too overloaded and almost but not quite computes a\ntopological sort of the depstrings.\n\n# Arguments\n\n- [predefined] \n- [arg] \n\n",
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"content": "\nElaborated systems contain functions, which means that they don't satisfy\n`==` for a lack of reflexivity.\nThey might *appear* to satisfy `==` reflexivity when the same exact value is\ncompared to itself, because object identity is used as an \"optimization\";\ncompare the value with a reconstruction of itself, e.g. with `f == a: f a`,\nor perhaps calling `elaborate` twice, and one will see reflexivity fail as described.\nHence a custom equality test.\nNote that this does not canonicalize the systems, so you'll want to make sure\nboth arguments have been `elaborate`-d.\n",
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"content": "\nReturn the sum of the numbers *e1* and *e2*.\n",
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"content": {
"content": "\nboolean “and”\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"content": {
"content": "\nbitwise “and”\n",
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"content": "\nbitwise “not”\n",
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"meta": {
"title": "lib.trivial.bitOr",
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"content": "\nbitwise “or”\n",
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"meta": {
"title": "lib.trivial.bitXor",
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"content": {
"content": "\nbitwise “xor”\n",
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"title": "lib.trivial.boolToString",
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"content": {
"content": "\nConvert a boolean to a string.\nThis function uses the strings \"true\" and \"false\" to represent\nboolean values. Calling `toString` on a bool instead returns \"1\"\nand \"\" (sic!).\n\n# Type\n\n```\nboolToString :: bool -> string\n```\n\n# Arguments\n\n- [b] \n\n",
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"content": "\nCheck if the elements in a list are valid values from a enum, returning the identity function, or throwing an error message otherwise.\n\n# Example\n\n```nix\nlet colorVariants = [\"bright\" \"dark\" \"black\"]\nin checkListOfEnum \"color variants\" [ \"standard\" \"light\" \"dark\" ] colorVariants;\n=>\nerror: color variants: bright, black unexpected; valid ones: standard, light, dark\n```\n\n# Type\n\n```\nString -> List ComparableVal -> List ComparableVal -> a -> a\n```\n\n# Arguments\n\n- [msg] \n- [valid] \n- [given] \n\n",
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"content": {
"content": "\nC-style comparisons\na < b, compare a b => -1\na == b, compare a b => 0\na > b, compare a b => 1\n\n# Arguments\n\n- [a] \n- [b] \n\n",
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"title": "lib.trivial.concat",
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"signature": "concat :: [a] -> [a] -> [a]\n",
"is_primop": false,
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"content": {
"content": "\nConcatenate two lists\n\n# Example\n\n```nix\nconcat [ 1 2 ] [ 3 4 ]\n=> [ 1 2 3 4 ]\n```\n\n# Type\n\n```\nconcat :: [a] -> [a] -> [a]\n```\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"content": "\nThe constant function\nIgnores the second argument. If called with only one argument,\nconstructs a function that always returns a static value.\n\n# Example\n\n```nix\nlet f = const 5; in f 10\n=> 5\n```\n\n# Type\n\n```\nconst :: a -> b -> a\n```\n\n# Arguments\n\n- [x] Value to return\n- [y] Value to ignore\n\n",
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"content": "\nThis is like `seq e1 e2`, except that *e1* is evaluated *deeply*:\nif it’s a list or set, its elements or attributes are also\nevaluated recursively.\n",
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"title": "lib.trivial.flip",
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"content": "\nFlip the order of the arguments of a binary function.\n\n# Example\n\n```nix\nflip concat [1] [2]\n=> [ 2 1 ]\n```\n\n# Type\n\n```\nflip :: (a -> b -> c) -> (b -> a -> c)\n```\n\n# Arguments\n\n- [f] \n- [a] \n- [b] \n\n",
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"meta": {
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"content": {
"content": "\nExtract the expected function arguments from a function.\nThis works both with nix-native { a, b ? foo, ... }: style\nfunctions and functions with args set with 'setFunctionArgs'. It\nhas the same return type and semantics as builtins.functionArgs.\nsetFunctionArgs : (a → b) → Map String Bool.\n\n# Arguments\n\n- [f] \n\n",
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"content": "\nTakes an *attrset* with the following attributes:\n\n- `startSet` [ Item ]\n - A list of start items. Each item must be an attrset containing a `key`. The `key` must be comparable.\n- `operator` Item -> [ Item ]\n - A function\n\nreturns a *list of attrsets*\n\nGenericClosure starts with the `startSet` and recursively\napplying the `operator` function to each `item`. The *attrsets* in the\n`startSet` and the *attrsets* produced by `operator` must contain a value\nnamed `key` which is comparable. The result is produced by calling `operator`\nfor each `item` with a value for `key` that has not been called yet including\nnewly produced `item`s. The function terminates when no new `item`s are\nproduced. The resulting *list of attrsets* contains only *attrsets* with a\nunique key. For example,\n\n```\nbuiltins.genericClosure {\n startSet = [ {key = 5;} ];\n operator = item: [{\n key = if (item.key / 2 ) * 2 == item.key\n then item.key / 2\n else 3 * item.key + 1;\n }];\n}\n```\nevaluates to\n```\n[ { key = 5; } { key = 16; } { key = 8; } { key = 4; } { key = 2; } { key = 1; } ]\n```\n",
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"meta": {
"title": "lib.trivial.id",
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"content": "\nThe identity function\nFor when you need a function that does “nothing”.\n\n# Type\n\n```\nid :: a -> a\n```\n\n# Arguments\n\n- [x] The value to return\n\n",
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"meta": {
"title": "lib.trivial.importJSON",
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"signature": "importJSON :: path -> any\n",
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"content": "\nReads a JSON file.\n\n# Type\n\n```\nimportJSON :: path -> any\n```\n\n# Arguments\n\n- [path] \n\n",
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"meta": {
"title": "lib.trivial.importTOML",
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"content": "\nReads a TOML file.\n\n# Type\n\n```\nimportTOML :: path -> any\n```\n\n# Arguments\n\n- [path] \n\n",
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"content": "\nReturn `true` if *e* evaluates to a float, and `false` otherwise.\n",
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"content": "\nCheck whether something is a function or something\nannotated with function args.\n\n# Arguments\n\n- [f] \n\n",
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"content": "\nWhether a feature is supported in all supported releases (at the time of\nrelease branch-off, if applicable). See `oldestSupportedRelease`.\n\n# Arguments\n\n- [release] Release number of feature introduction as an integer, e.g. 2111 for 21.11. Set it to the upcoming release, matching the nixpkgs/.version file.\n\n\n",
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"content": {
"content": "\nReturn `true` if *e* evaluates to an integer, and `false` otherwise.\n",
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"meta": {
"title": "lib.trivial.lessThan",
"path": ["lib", "trivial", "lessThan"],
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["builtins", "lessThan"],
["lib", "lessThan"]
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"signature": null,
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"content": "\nReturn `true` if the number *e1* is less than the number *e2*, and\n`false` otherwise. Evaluation aborts if either *e1* or *e2* does not\nevaluate to a number.\n",
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"meta": {
"title": "lib.trivial.mapNullable",
"path": ["lib", "trivial", "mapNullable"],
"aliases": [["lib", "mapNullable"]],
"signature": null,
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"primop_meta": null,
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"content": "\nApply function if the supplied argument is non-null.\n\n# Example\n\n```nix\nmapNullable (x: x+1) null\n=> null\nmapNullable (x: x+1) 22\n=> 23\n```\n\n# Arguments\n\n- [f] Function to call\n- [a] Argument to check for null before passing it to `f`\n\n",
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"title": "lib.trivial.max",
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"aliases": [["lib", "max"]],
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"content": {
"content": "\nReturn maximum of two numbers.\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"meta": {
"title": "lib.trivial.mergeAttrs",
"path": ["lib", "trivial", "mergeAttrs"],
"aliases": [["lib", "mergeAttrs"]],
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"primop_meta": null,
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"content": "\nMerge two attribute sets shallowly, right side trumps left\nmergeAttrs :: attrs -> attrs -> attrs\n\n# Example\n\n```nix\nmergeAttrs { a = 1; b = 2; } { b = 3; c = 4; }\n=> { a = 1; b = 3; c = 4; }\n```\n\n# Arguments\n\n- [x] Left attribute set\n- [y] Right attribute set (higher precedence for equal keys)\n\n",
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"meta": {
"title": "lib.trivial.min",
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"content": "\nReturn minimum of two numbers.\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"content": "\n`mirrorFunctionArgs f g` creates a new function `g'` with the same behavior as `g` (`g' x == g x`)\nbut its function arguments mirroring `f` (`lib.functionArgs g' == lib.functionArgs f`).\n\n# Example\n\n```nix\naddab = {a, b}: a + b\naddab { a = 2; b = 4; }\n=> 6\nlib.functionArgs addab\n=> { a = false; b = false; }\naddab1 = attrs: addab attrs + 1\naddab1 { a = 2; b = 4; }\n=> 7\nlib.functionArgs addab1\n=> { }\naddab1' = lib.mirrorFunctionArgs addab addab1\naddab1' { a = 2; b = 4; }\n=> 7\nlib.functionArgs addab1'\n=> { a = false; b = false; }\n```\n\n# Type\n\n```\nmirrorFunctionArgs :: (a -> b) -> (a -> c) -> (a -> c)\n```\n\n# Arguments\n\n- [f] Function to provide the argument metadata\n\n",
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"content": "\nInteger modulus\n\n# Example\n\n```nix\nmod 11 10\n=> 1\nmod 1 10\n=> 1\n```\n\n# Arguments\n\n- [base] \n- [int] \n\n",
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"content": "\nboolean “or”\n\n# Arguments\n\n- [x] \n- [y] \n\n",
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"content": "\nPipes a value through a list of functions, left to right.\n\n# Example\n\n```nix\npipe 2 [\n (x: x + 2) # 2 + 2 = 4\n (x: x * 2) # 4 * 2 = 8\n ]\n => 8\n # ideal to do text transformations\n pipe [ \"a/b\" \"a/c\" ] [\n # create the cp command\n (map (file: ''cp \"${src}/${file}\" $out\\n''))\n # concatenate all commands into one string\n lib.concatStrings\n # make that string into a nix derivation\n (pkgs.runCommand \"copy-to-out\" {})\n ]\n => <drv which copies all files to $out>\nThe output type of each function has to be the input type\nof the next function, and the last function returns the\nfinal value.\n```\n\n# Type\n\n```\npipe :: a -> [<functions>] -> <return type of last function>\n```\n\n# Arguments\n\n- [val] \n- [functions] \n\n",
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"content": "\nAttempts to return the the current revision of nixpkgs and\nreturns the supplied default value otherwise.\n\n# Type\n\n```\nrevisionWithDefault :: string -> string\n```\n\n# Arguments\n\n- [default] Default value to return if revision can not be determined\n\n",
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"content": "\nEvaluate *e1*, then evaluate and return *e2*. This ensures that a\ncomputation is strict in the value of *e1*.\n",
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"content": "\nSplit type into two subtypes by predicate `p`, take all elements\nof the first subtype to be less than all the elements of the\nsecond subtype, compare elements of a single subtype with `yes`\nand `no` respectively.\n\n# Example\n\n```nix\nlet cmp = splitByAndCompare (hasPrefix \"foo\") compare compare; in\ncmp \"a\" \"z\" => -1\ncmp \"fooa\" \"fooz\" => -1\ncmp \"f\" \"a\" => 1\ncmp \"fooa\" \"a\" => -1\n# while\ncompare \"fooa\" \"a\" => 1\n```\n\n# Type\n\n```\n(a -> bool) -> (a -> a -> int) -> (a -> a -> int) -> (a -> a -> int)\n```\n\n# Arguments\n\n- [p] Predicate\n- [yes] Comparison function if predicate holds for both values\n- [no] Comparison function if predicate holds for neither value\n- [a] First value to compare\n- [b] Second value to compare\n\n",
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"content": "\nReturn the difference between the numbers *e1* and *e2*.\n",
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"content": "\nLike throwIfNot, but negated (throw if the first argument is `true`).\n\n# Type\n\n```\nbool -> string -> a -> a\n```\n\n# Arguments\n\n- [cond] \n- [msg] \n\n",
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"content": "\nLike the `assert b; e` expression, but with a custom error message and\nwithout the semicolon.\nIf true, return the identity function, `r: r`.\nIf false, throw the error message.\nCalls can be juxtaposed using function application, as `(r: r) a = a`, so\n`(r: r) (r: r) a = a`, and so forth.\n\n# Example\n\n```nix\nthrowIfNot (lib.isList overlays) \"The overlays argument to nixpkgs must be a list.\"\nlib.foldr (x: throwIfNot (lib.isFunction x) \"All overlays passed to nixpkgs must be functions.\") (r: r) overlays\npkgs\n```\n\n# Type\n\n```\nbool -> string -> a -> a\n```\n\n# Arguments\n\n- [cond] \n- [msg] \n\n",
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"content": "\n`toBaseDigits base i` converts the positive integer i to a list of its\ndigits in the given base. For example:\ntoBaseDigits 10 123 => [ 1 2 3 ]\ntoBaseDigits 2 6 => [ 1 1 0 ]\ntoBaseDigits 16 250 => [ 15 10 ]\n\n# Arguments\n\n- [base] \n- [i] \n\n",
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"content": "\nTurns any non-callable values into constant functions.\nReturns callable values as is.\n\n# Example\n\n```nix\nnix-repl> lib.toFunction 1 2\n1\nnix-repl> lib.toFunction (x: x + 1) 2\n3\n```\n\n# Arguments\n\n- [v] Any value\n\n",
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"content": "\nConvert the given positive integer to a string of its hexadecimal\nrepresentation. For example:\ntoHexString 0 => \"0\"\ntoHexString 16 => \"10\"\ntoHexString 250 => \"FA\"\n\n# Arguments\n\n- [i] \n\n",
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"content": "\nSplit [a subpath](#function-library-lib.path.subpath.isValid) into its path component strings.\nThrow an error if the subpath isn't valid.\nNote that the returned path components are also [valid subpath strings](#function-library-lib.path.subpath.isValid), though they are intentionally not [normalised](#function-library-lib.path.subpath.normalise).\nLaws:\n- Splitting a subpath into components and [joining](#function-library-lib.path.subpath.join) the components gives the same subpath but [normalised](#function-library-lib.path.subpath.normalise):\nsubpath.join (subpath.components s) == subpath.normalise s\n\n# Example\n\n```nix\nsubpath.components \".\"\n=> [ ]\nsubpath.components \"./foo//bar/./baz/\"\n=> [ \"foo\" \"bar\" \"baz\" ]\nsubpath.components \"/foo\"\n=> <error>\n```\n\n# Type\n\n```\nsubpath.components :: String -> [ String ]\n```\n\n# Arguments\n\n- [subpath] The subpath string to split into components\n\n",
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"content": "\nWhether a value is a valid subpath string.\nA subpath string points to a specific file or directory within an absolute base directory.\nIt is a stricter form of a relative path that excludes `..` components, since those could escape the base directory.\n- The value is a string.\n- The string is not empty.\n- The string doesn't start with a `/`.\n- The string doesn't contain any `..` path components.\n\n# Example\n\n```nix\n# Not a string\nsubpath.isValid null\n=> false\n# Empty string\nsubpath.isValid \"\"\n=> false\n# Absolute path\nsubpath.isValid \"/foo\"\n=> false\n# Contains a `..` path component\nsubpath.isValid \"../foo\"\n=> false\n# Valid subpath\nsubpath.isValid \"foo/bar\"\n=> true\n# Doesn't need to be normalised\nsubpath.isValid \"./foo//bar/\"\n=> true\n```\n\n# Type\n\n```\nsubpath.isValid :: String -> Bool\n```\n\n# Arguments\n\n- [value] The value to check\n\n",
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"content": "\nJoin subpath strings together using `/`, returning a normalised subpath string.\nLike `concatStringsSep \"/\"` but safer, specifically:\n- All elements must be [valid subpath strings](#function-library-lib.path.subpath.isValid).\n- The result gets [normalised](#function-library-lib.path.subpath.normalise).\n- The edge case of an empty list gets properly handled by returning the neutral subpath `\"./.\"`.\nLaws:\n- Associativity:\nsubpath.join [ x (subpath.join [ y z ]) ] == subpath.join [ (subpath.join [ x y ]) z ]\n- Identity - `\"./.\"` is the neutral element for normalised paths:\nsubpath.join [ ] == \"./.\"\nsubpath.join [ (subpath.normalise p) \"./.\" ] == subpath.normalise p\nsubpath.join [ \"./.\" (subpath.normalise p) ] == subpath.normalise p\n- Normalisation - the result is [normalised](#function-library-lib.path.subpath.normalise):\nsubpath.join ps == subpath.normalise (subpath.join ps)\n- For non-empty lists, the implementation is equivalent to [normalising](#function-library-lib.path.subpath.normalise) the result of `concatStringsSep \"/\"`.\nNote that the above laws can be derived from this one:\nps != [] -> subpath.join ps == subpath.normalise (concatStringsSep \"/\" ps)\n\n# Example\n\n```nix\nsubpath.join [ \"foo\" \"bar/baz\" ]\n=> \"./foo/bar/baz\"\n# normalise the result\nsubpath.join [ \"./foo\" \".\" \"bar//./baz/\" ]\n=> \"./foo/bar/baz\"\n# passing an empty list results in the current directory\nsubpath.join [ ]\n=> \"./.\"\n# elements must be valid subpath strings\nsubpath.join [ /foo ]\n=> <error>\nsubpath.join [ \"\" ]\n=> <error>\nsubpath.join [ \"/foo\" ]\n=> <error>\nsubpath.join [ \"../foo\" ]\n=> <error>\n```\n\n# Type\n\n```\nsubpath.join :: [ String ] -> String\n```\n\n# Arguments\n\n- [subpaths] The list of subpaths to join together\n\n",
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"content": "\nNormalise a subpath. Throw an error if the subpath isn't [valid](#function-library-lib.path.subpath.isValid).\n- Limit repeating `/` to a single one.\n- Remove redundant `.` components.\n- Remove trailing `/` and `/.`.\n- Add leading `./`.\nLaws:\n- Idempotency - normalising multiple times gives the same result:\nsubpath.normalise (subpath.normalise p) == subpath.normalise p\n- Uniqueness - there's only a single normalisation for the paths that lead to the same file system node:\nsubpath.normalise p != subpath.normalise q -> $(realpath ${p}) != $(realpath ${q})\n- Don't change the result when [appended](#function-library-lib.path.append) to a Nix path value:\nappend base p == append base (subpath.normalise p)\n- Don't change the path according to `realpath`:\n$(realpath ${p}) == $(realpath ${subpath.normalise p})\n- Only error on [invalid subpaths](#function-library-lib.path.subpath.isValid):\nbuiltins.tryEval (subpath.normalise p)).success == subpath.isValid p\n\n# Example\n\n```nix\n# limit repeating `/` to a single one\nsubpath.normalise \"foo//bar\"\n=> \"./foo/bar\"\n# remove redundant `.` components\nsubpath.normalise \"foo/./bar\"\n=> \"./foo/bar\"\n# add leading `./`\nsubpath.normalise \"foo/bar\"\n=> \"./foo/bar\"\n# remove trailing `/`\nsubpath.normalise \"foo/bar/\"\n=> \"./foo/bar\"\n# remove trailing `/.`\nsubpath.normalise \"foo/bar/.\"\n=> \"./foo/bar\"\n# Return the current directory as `./.`\nsubpath.normalise \".\"\n=> \"./.\"\n# error on `..` path components\nsubpath.normalise \"foo/../bar\"\n=> <error>\n# error on empty string\nsubpath.normalise \"\"\n=> <error>\n# error on absolute path\nsubpath.normalise \"/foo\"\n=> <error>\n```\n\n# Type\n\n```\nsubpath.normalise :: String -> String\n```\n\n# Arguments\n\n- [subpath] The subpath string to normalise\n\n",
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"content": "\nQuickly create a set of symlinks to derivations.\nThis creates a simple derivation with symlinks to all inputs.\nentries can be a list of attribute sets like\n[ { name = \"name\" ; path = \"/nix/store/...\"; } ]\nor an attribute set name -> path like:\n{ name = \"/nix/store/...\"; other = \"/nix/store/...\"; }\n\n# Example\n\n```nix\n# Symlinks hello and stack paths in store to current $out/hello-test and\n# $out/foobar.\nlinkFarm \"myexample\" [ { name = \"hello-test\"; path = pkgs.hello; } { name = \"foobar\"; path = pkgs.stack; } ]\nThis creates a derivation with a directory structure like the following:\n/nix/store/qc5728m4sa344mbks99r3q05mymwm4rw-myexample\n|-- foobar -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1\n`-- hello-test -> /nix/store/qy93dp4a3rqyn2mz63fbxjg228hffwyw-hello-2.10\nSee the note on symlinkJoin for the difference between linkFarm and symlinkJoin.\n```\n\n# Arguments\n\n- [name] \n- [entries] \n\n",
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"content": "\nbackward compatibility with old uncurried form; deprecated\n\n# Arguments\n\n- [splicePackages] \n- [newScope] \n- [otherSplices] \n- [keep] \n- [extra] \n- [f] \n\n",
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"content": "\nCreate a forest of symlinks to the files in `paths'.\nThis creates a single derivation that replicates the directory structure\nof all the input paths.\nBEWARE: it may not \"work right\" when the passed paths contain symlinks to directories.\n\n# Example\n\n```nix\n# adds symlinks of hello to current build.\nsymlinkJoin { name = \"myhello\"; paths = [ pkgs.hello ]; }\n# adds symlinks of hello and stack to current build and prints \"links added\"\nsymlinkJoin { name = \"myexample\"; paths = [ pkgs.hello pkgs.stack ]; postBuild = \"echo links added\"; }\nThis creates a derivation with a directory structure like the following:\n/nix/store/sglsr5g079a5235hy29da3mq3hv8sjmm-myexample\n|-- bin\n| |-- hello -> /nix/store/qy93dp4a3rqyn2mz63fbxjg228hffwyw-hello-2.10/bin/hello\n| `-- stack -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/bin/stack\n`-- share\n |-- bash-completion\n | `-- completions\n | `-- stack -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/share/bash-completion/completions/stack\n |-- fish\n | `-- vendor_completions.d\n | `-- stack.fish -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/share/fish/vendor_completions.d/stack.fish\n...\nsymlinkJoin and linkFarm are similar functions, but they output\nderivations with different structure.\nsymlinkJoin is used to create a derivation with a familiar directory\nstructure (top-level bin/, share/, etc), but with all actual files being symlinks to\nthe files in the input derivations.\nsymlinkJoin is used many places in nixpkgs to create a single derivation\nthat appears to contain binaries, libraries, documentation, etc from\nmultiple input derivations.\nlinkFarm is instead used to create a simple derivation with symlinks to\nother derivations. A derivation created with linkFarm is often used in CI\nas a easy way to build multiple derivations at once.\n```\n\n# Arguments\n\n\n",
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"content": "\nWrites a text file to /nix/store/<store path>/bin/<name> and\nmarks the file as executable.\n\n# Example\n\n```nix\n# Writes my-file to /nix/store/<store path>/bin/my-file and makes executable.\nwriteScriptBin \"my-file\"\n ''\n Contents of File\n '';\n```\n\n# Arguments\n\n- [name] \n- [text] \n\n",
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"content": "\nSimilar to writeShellScriptBin and writeScriptBin.\nWrites an executable Shell script to /nix/store/<store path>/bin/<name> and\nchecks its syntax with shellcheck and the shell's -n option.\nIndividual checks can be foregone by putting them in the excludeShellChecks\nlist, e.g. [ \"SC2016\" ].\nAutomatically includes sane set of shellopts (errexit, nounset, pipefail)\nand handles creation of PATH based on runtimeInputs\nNote that the checkPhase uses stdenv.shell for the test run of the script,\nwhile the generated shebang uses runtimeShell. If, for whatever reason,\nthose were to mismatch you might lose fidelity in the default checks.\n\n# Example\n\n```nix\nWrites my-file to /nix/store/<store path>/bin/my-file and makes executable.\nwriteShellApplication {\n name = \"my-file\";\n runtimeInputs = [ curl w3m ];\n text = ''\n curl -s 'https://nixos.org' | w3m -dump -T text/html\n '';\n}\n```\n\n# Arguments\n\n\n",
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"content": "\nSimilar to writeShellScript and writeScriptBin.\nWrites an executable Shell script to /nix/store/<store path>/bin/<name> and checks its syntax.\nAutomatically includes interpreter above the contents passed.\n\n# Example\n\n```nix\n# Writes my-file to /nix/store/<store path>/bin/my-file and makes executable.\nwriteShellScriptBin \"my-file\"\n ''\n Contents of File\n '';\n```\n\n# Arguments\n\n- [name] \n- [text] \n\n",
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