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Make overrides
an overlay type rather than a functionTo
(#67)
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@ -10,6 +10,8 @@
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- #37: Group `buildTools` (renamed to `tools`), `hlsCheck` and `hlintCheck` under the `devShell` submodule option; and allow disabling them all using `devShell.enable = false;` (useful if you want haskell-flake to produce just the package outputs).
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- #64: Remove hlintCheck (use [treefmt-nix](https://github.com/numtide/treefmt-nix#flake-parts) instead)
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- #52: Expose the final package set as `finalPackages`. Rename `haskellPackages`, accordingly, to `basePackages`. Overlays are applied on top of `basePackage` -- using `source-overrides`, `overrides`, `packages` in that order -- to produce `finalPackages`.
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- #68: You can now use `imports` inside of `haskellProjects.<name>` to modularize your Haskell project configuration.
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- #67: `overrides` will be combined using `composeManyExtensions`, however their order is arbitrary. This is an experimental feature, and a warning will be logged.
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## 0.1.0
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@ -99,12 +99,51 @@ in
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description = ''Package overrides given new source path'';
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default = { };
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};
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overrides = mkOption {
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type = functionTo (functionTo (types.lazyAttrsOf raw));
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overrides =
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let
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# WARNING: While the order is deterministic, it is not
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# determined by the user. Thus overlays may be applied in
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# an unexpected order.
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# We need: https://github.com/NixOS/nixpkgs/issues/215486
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haskellOverlayType = types.mkOptionType {
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name = "haskellOverlay";
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description = "An Haskell overlay function";
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descriptionClass = "noun";
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# NOTE: This check is not exhaustive, as there is no way
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# to check that the function takes two arguments, and
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# returns an attrset.
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check = lib.isFunction;
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merge = _loc: defs:
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let
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logWarning =
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if builtins.length defs > 1
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then builtins.trace "WARNING[haskell-flake]: Multiple haskell overlays are applied in arbitrary order." null
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else null;
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overlays =
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map (x: x.value)
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(builtins.seq
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logWarning
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defs);
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in
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lib.composeManyExtensions overlays;
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};
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in
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mkOption {
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type = haskellOverlayType;
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description = ''
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Overrides for the Cabal project
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Cabal package overrides for this Haskell project
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For handy functions, see <https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/lib/compose.nix>
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For handy functions, see
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<https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/lib/compose.nix>
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**WARNING**: When using `imports`, multiple overlays
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will be merged using `lib.composeManyExtensions`.
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However the order the overlays are applied can be
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arbitrary (albeit deterministic, based on module system
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implementation). Thus, the use of `overrides` via
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`imports` is not officiallly supported. If you'd like
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to see proper support, add your thumbs up to
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<https://github.com/NixOS/nixpkgs/issues/215486>.
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'';
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default = self: super: { };
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defaultText = lib.literalExpression "self: super: { }";
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@ -24,21 +24,36 @@
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];
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perSystem = { self', pkgs, ... }: {
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haskellProjects.default = {
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# Multiple modules should be merged correctly.
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imports =
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let
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defaults = {
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overrides = self: super: {
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# Custom library overrides (here, "foo" comes from a flake input)
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foo = self.callCabal2nix "foo" (inputs.haskell-multi-nix + /foo) { };
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# This is purposefully incorrect (pointing to ./.) because we
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# expect it to be overriden below.
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foo = self.callCabal2nix "foo" ./. { };
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};
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devShell = {
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tools = hp: {
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# Some buildTools are included by default. If you do not want them,
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# set them to 'null' here.
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# Setting to null should remove this tool from defaults.
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ghcid = null;
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# You can also add additional build tools.
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fzf = pkgs.fzf;
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};
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hlsCheck.enable = true;
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};
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};
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in
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[ defaults ];
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overrides = self: super: {
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# This overrides the overlay above (in `defaults`), because the
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# module system merges them in such order. cf. the WARNING in option
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# docs.
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foo = self.callCabal2nix "foo" (inputs.haskell-multi-nix + /foo) { };
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};
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devShell.tools = hp: {
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# Adding a tool should make it available in devshell.
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fzf = pkgs.fzf;
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};
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};
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# haskell-flake doesn't set the default package, but you can do it here.
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packages.default = self'.packages.haskell-flake-test;
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};
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