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default.nix
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default.nix
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let
sources = import ./npins;
in
{
system ? builtins.currentSystem,
nixpkgs ? sources.nixpkgs,
serokell-nix ? sources.serokell-nix,
}:
let
overlay = self: super: {
haskell = super.haskell // {
packageOverrides = self: super: { nixfmt = self.callCabal2nix "nixfmt" haskellSource { }; };
};
treefmt = super.treefmt.overrideAttrs (old: {
patches = [
# Makes it work in parallel: https://github.com/numtide/treefmt/pull/282
(self.fetchpatch {
url = "https://github.com/numtide/treefmt/commit/f596795cd24b50f048cc395866bb90a89d99152d.patch";
hash = "sha256-EPn+JAT3aZLSWmpdi9ULZ8o8RvrX+UFp0cQWfBcQgVg=";
})
];
});
};
pkgs = import nixpkgs {
inherit system;
overlays = [
overlay
(import (serokell-nix + "/overlay"))
];
config = { };
};
inherit (pkgs) haskell lib;
fs = lib.fileset;
allFiles = fs.gitTracked ./.;
# Used for source-wide checks
source = fs.toSource {
root = ./.;
fileset = allFiles;
};
haskellSource = fs.toSource {
root = ./.;
# Limit to only files needed for the Haskell build
fileset = fs.intersection allFiles (
fs.unions [
./nixfmt.cabal
./src
./main
./LICENSE
]
);
};
build = lib.pipe pkgs.haskellPackages.nixfmt [
haskell.lib.justStaticExecutables
haskell.lib.dontHaddock
(drv: lib.lazyDerivation { derivation = drv; })
];
treefmtEval = (import sources.treefmt-nix).evalModule pkgs {
# Used to find the project root
projectRootFile = ".git/config";
# This uses the version from Nixpkgs instead of the local one,
# which would require building the package to get a development shell
programs.nixfmt-rfc-style.enable = true;
# We don't want to format the files we use to test the formatter!
settings.formatter.nixfmt-rfc-style.excludes = [ "test/*" ];
# Haskell formatter
programs.fourmolu.enable = true;
};
checks = {
inherit build;
hlint = pkgs.build.haskell.hlint haskellSource;
reuse = pkgs.stdenvNoCC.mkDerivation {
name = "nixfmt-reuse";
src = source;
nativeBuildInputs = with pkgs; [ reuse ];
buildPhase = "reuse lint";
installPhase = "touch $out";
};
tests = pkgs.stdenvNoCC.mkDerivation {
name = "nixfmt-tests";
src = fs.toSource {
root = ./.;
fileset = fs.intersection allFiles ./test;
};
nativeBuildInputs = with pkgs; [
shellcheck
build
];
patchPhase = "patchShebangs .";
buildPhase = "./test/test.sh";
installPhase = "touch $out";
};
treefmt = treefmtEval.config.build.check source;
};
in
build
// {
packages.nixfmt = build;
inherit pkgs;
shell = pkgs.haskellPackages.shellFor {
packages = p: [ p.nixfmt ];
nativeBuildInputs = with pkgs; [
cabal-install
stylish-haskell
haskellPackages.haskell-language-server
shellcheck
npins
hlint
treefmtEval.config.build.wrapper
];
};
inherit checks;
ci = pkgs.linkFarm "ci" checks;
}