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https://github.com/nix-community/dream2nix.git
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Add impure Racket translator
This commit is contained in:
Brian Leung
parent
a6502bd52e
commit
c17d995e8d
18
examples/racket/flake.nix
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18
examples/racket/flake.nix
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{
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inputs = {
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dream2nix.url = "github:nix-community/dream2nix";
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goblins.url = "gitlab:leungbk/goblins";
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goblins.flake = false;
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};
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outputs = {
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self,
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dream2nix,
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goblins,
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} @ inp: (dream2nix.lib.makeFlakeOutputs {
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systems = ["x86_64-linux"];
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config.projectRoot = ./.;
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source = goblins;
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});
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}
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80
src/subsystems/racket/translators/racket-impure/default.nix
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80
src/subsystems/racket/translators/racket-impure/default.nix
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{
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dlib,
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lib,
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...
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}: let
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l = lib // builtins;
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in {
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type = "impure";
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# A derivation which outputs a single executable at `$out`.
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# The executable will be called by dream2nix for translation
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# The input format is specified in /specifications/translator-call-example.json.
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# The first arg `$1` will be a json file containing the input parameters
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# like defined in /src/specifications/translator-call-example.json and the
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# additional arguments required according to extraArgs
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#
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# The program is expected to create a file at the location specified
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# by the input parameter `outFile`.
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# The output file must contain the dream lock data encoded as json.
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# See /src/specifications/dream-lock-example.json
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translateBin = {
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# dream2nix utils
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utils,
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# nixpkgs dependencies
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bash,
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coreutils,
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fetchurl,
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jq,
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nix,
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racket,
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runCommandLocal,
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writeScriptBin,
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...
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}: let
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pruned-racket-catalog = let
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src = fetchurl {
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url = "https://github.com/nix-community/pruned-racket-catalog/tarball/9f11e5ea5765c8a732c5e3129ca2b71237ae2bac";
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sha256 = "sha256-/n30lailqSndoqPGWcFquCpQWVQcciMiypXYLhNmFUo=";
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};
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in
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runCommandLocal "pruned-racket-catalog" {} ''
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mkdir $out
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cd $out
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tar --strip-components 1 -xf ${src}
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'';
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in
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utils.writePureShellScript
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[
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bash
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coreutils
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jq
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nix
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racket
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]
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''
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# according to the spec, the translator reads the input from a json file
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jsonInput=$1
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# read the json input
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outputFile=$(realpath -m $(jq '.outputFile' -c -r $jsonInput))
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source=$(jq '.source' -c -r $jsonInput)
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relPath=$(jq '.project.relPath' -c -r $jsonInput)
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name=$(jq '.project.name' -c -r $jsonInput)
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export RACKET_OUTPUT_FILE=$outputFile
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export RACKET_SOURCE=$source
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export RACKET_RELPATH=$relPath
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export RACKET_PKG_MAYBE_NAME=$name
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racket -e '(require (file "${./generate-dream-lock.rkt}")) (generate-dream-lock "${pruned-racket-catalog}/pkgs-all")'
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'';
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# If the translator requires additional arguments, specify them here.
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# When users run the CLI, they will be asked to specify these arguments.
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# There are only two types of arguments:
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# - string argument (type = "argument")
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# - boolean flag (type = "flag")
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# String arguments contain a default value and examples. Flags do not.
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extraArgs = {};
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}
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@ -0,0 +1,150 @@
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#lang racket/base
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(require json)
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(require racket/file)
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(require racket/match)
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(require racket/list)
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(require racket/set)
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(require racket/string)
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(require setup/getinfo)
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(provide generate-dream-lock)
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;; XXX: We presently end up doing multiple DFSes in the course of
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;; generating multiple dream-lock.json files for foo, foo-lib,
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;; foo-test: the issue is that generating the foo dream-lock requires
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;; that we traverse foo-lib, and that subsequently generating the
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;; foo-lib dream-lock requires repeating the same traversal of foo-lib. How can this be avoided?
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(define (generate-dream-lock pkgs-all-path)
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(letrec ([src-path (getenv "RACKET_SOURCE")]
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[rel-path (getenv "RACKET_RELPATH")]
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[package-path (simplify-path (cleanse-path (build-path src-path (if (string=? rel-path "")
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'same
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rel-path))))]
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[parent-path (simplify-path (cleanse-path (build-path package-path 'up)))]
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[package-name (if (string=? rel-path "")
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(getenv "RACKET_PKG_MAYBE_NAME")
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(path->string
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(match/values (split-path package-path)
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((_base subdir _must-be-dir?) subdir))))]
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[pkgs-all (with-input-from-file pkgs-all-path read)]
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[pkg-in-stdlib? (lambda (pkg-name)
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(or ;; Some people add racket itself as a dependency for some reason
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(string=? pkg-name "racket")
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(ormap (lambda (tag)
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;; XXX: would prefer to use memq, but tag is mutable for some reason
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(member tag '("main-distribution" "main-tests")))
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(hash-ref (hash-ref pkgs-all pkg-name) 'tags))))]
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[dep-alist-from-catalog (hash-map pkgs-all
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(match-lambda**
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[(name (hash-table ('dependencies dependencies)))
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(let ([external-deps (filter-not pkg-in-stdlib? dependencies)])
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(cons name external-deps))]))]
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[compute-overridden-dep-lists
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(lambda (name dir)
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(let ([info-procedure (get-info/full dir)])
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(and info-procedure
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(cons name
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(remove-duplicates
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(filter-not pkg-in-stdlib?
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(map (match-lambda
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[(or (cons pkg-name _) pkg-name)
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pkg-name])
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(append (with-handlers ([exn:fail? (lambda (_) '())])
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(info-procedure 'deps))
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(with-handlers ([exn:fail? (lambda (_) '())])
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(info-procedure 'build-deps))))))))))]
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[dep-list-overrides
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;; XXX: this probably doesn't capture every case since
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;; Racket doesn't seem to enforce much structure in a
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;; multi-package repo, but it accounts for the only cases
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;; that a sane person would choose
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(if (string=? rel-path "")
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(list (compute-overridden-dep-lists package-name package-path))
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(let* ([sibling-paths (filter directory-exists?
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(directory-list parent-path #:build? #t))]
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[names-of-sibling-paths (map (lambda (p)
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;; XXX: maybe not very DRY
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(path->string
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(match/values (split-path p)
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((_base dir-fragment _must-be-dir?) dir-fragment))))
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sibling-paths)])
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(filter-map compute-overridden-dep-lists
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names-of-sibling-paths
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sibling-paths)))]
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[names-of-overridden-packages (apply set (map car dep-list-overrides))]
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[graph (make-immutable-hash (append dep-alist-from-catalog
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dep-list-overrides))]
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;; TODO: no effort is made to handle cycles right now
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[dfs (lambda (u dependency-subgraph)
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(if (hash-has-key? dependency-subgraph u)
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dependency-subgraph
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(let ([destinations (hash-ref graph u)])
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(foldl dfs
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(hash-set dependency-subgraph u destinations)
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destinations))))]
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[dependency-subgraph (dfs package-name (make-immutable-hash))]
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[generic (make-immutable-hash
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`((subsystem . "racket")
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(location . ,rel-path)
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(sourcesAggregatedHash . ,(json-null))
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(defaultPackage . ,package-name)
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(packages . ,(make-immutable-hash `((,(string->symbol package-name) . "0.0.0"))))))]
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[sources-from-catalog
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(hash-map pkgs-all
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(match-lambda**
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[(name (hash-table
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('versions
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(hash-table
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('default
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(hash-table
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('source_url url)))))
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('checksum rev)))
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(let* ([source-with-removed-http-or-git-double-slash (regexp-replace #rx"^(?:git|http)://" url "https://")]
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[left-trimmed-source (string-trim source-with-removed-http-or-git-double-slash "git+" #:right? #f)]
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[maybe-match-path (regexp-match #rx"\\?path=([^#]+)" left-trimmed-source)]
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[trimmed-source (regexp-replace #rx"(?:/tree/.+)?(?:\\?path=.+)?$" left-trimmed-source "")])
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(cons (string->symbol name)
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(make-immutable-hash
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`((0.0.0 . ,(make-immutable-hash
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(append (match maybe-match-path
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[(list _match dir)
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`((dir . ,(regexp-replace* #rx"%2F" dir "/")))]
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[_ '()])
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`((url . ,trimmed-source)
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(rev . ,rev)
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(type . "git")
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;; TODO: sha256?
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))))))))]))]
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[sources-from-repo (if (string=? rel-path "")
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(list (cons (string->symbol package-name)
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(make-immutable-hash
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`((0.0.0 . ,(make-immutable-hash
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`((type . "path")
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(path . ,src-path))))))))
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(set-map names-of-overridden-packages
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(lambda (name)
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(cons (string->symbol name)
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(make-immutable-hash
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`((0.0.0 . ,(make-immutable-hash
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`((type . "path")
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(path . ,(path->string (build-path parent-path (string-append-immutable name "/")))))))))))))]
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[sources-hash-table (make-immutable-hash (append sources-from-catalog
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sources-from-repo))]
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[sources (make-immutable-hash (hash-map dependency-subgraph
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(lambda (name _v)
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(cons (string->symbol name) (hash-ref sources-hash-table (string->symbol name))))))]
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[dream-lock (make-immutable-hash
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`((_generic . ,generic)
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(sources . ,sources)
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(_subsystem . ,(make-immutable-hash))
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(dependencies . ,(make-immutable-hash
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(hash-map dependency-subgraph
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(lambda (name dep-list)
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(cons (string->symbol name)
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(make-immutable-hash `((0.0.0 . ,(map (lambda (dep-name) (list dep-name "0.0.0")) dep-list)))))))))))])
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(make-parent-directory* (getenv "RACKET_OUTPUT_FILE"))
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(with-output-to-file (getenv "RACKET_OUTPUT_FILE")
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(lambda () (write-json dream-lock))
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#:exists 'replace)))
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