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flake.nix
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flake.nix
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{
nixConfig = {
extra-substituters = "https://cache.ners.ch/haskell";
extra-trusted-public-keys = "haskell:WskuxROW5pPy83rt3ZXnff09gvnu80yovdeKDw5Gi3o=";
};
inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
outputs = inputs:
with builtins;
let
inherit (inputs.nixpkgs) lib;
foreach = xs: f: with lib; foldr recursiveUpdate { } (
if isList xs then map f xs
else if isAttrs xs then mapAttrsToList f xs
else throw "foreach: expected list or attrset but got ${typeOf xs}"
);
hsSrc = root: with lib.fileset; toSource {
inherit root;
fileset = fileFilter (file: any file.hasExt [ "cabal" "hs" "md" ] || file.type == "directory") ./.;
};
pname = "lsp-client";
src = hsSrc ./.;
ghcs = [ "ghc92" "ghc94" "ghc96" "ghc98" ];
overlay = final: prev: {
haskell = prev.haskell // {
packageOverrides = lib.composeManyExtensions [
prev.haskell.packageOverrides
(hfinal: hprev: {
${pname} = hfinal.callCabal2nix pname src { };
})
];
};
};
in
foreach inputs.nixpkgs.legacyPackages
(system: pkgs':
let
pkgs = pkgs'.extend overlay;
hps =
lib.filterAttrs (ghc: _: elem ghc ghcs) pkgs.haskell.packages
// { default = pkgs.haskellPackages; };
inherit (hps.default.${pname}) version;
allPackages =
pkgs.symlinkJoin {
name = "${pname}-all-${version}";
paths = map (hp: hp.${pname}) (attrValues hps);
};
release = with pkgs.haskell.lib; pkgs.linkFarm "${pname}-release-${version}" {
sdist = sdistTarball hps.default.${pname};
docs = documentationTarball hps.default.${pname};
};
default = pkgs.symlinkJoin {
inherit (hps.default.${pname}) name;
paths = [
allPackages
release
];
};
in
{
formatter.${system} = pkgs.nixpkgs-fmt;
legacyPackages.${system} = pkgs'.extend lspOverlay;
packages.${system} = { inherit default; };
devShells.${system} =
foreach hps (ghcName: hp: {
${ghcName} = hp.shellFor {
packages = ps: [ ps.${pname} ];
nativeBuildInputs = with hp; [
cabal-install
fourmolu
haskell-language-server
];
};
});
}
) // {
overlays.default = overlay;
};
}