nixpkgs/pkgs/development/haskell-modules/default.nix

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{ pkgs, stdenv, ghc
, packageSetConfig ? (self: super: {})
, overrides ? (self: super: {})
, provideOldAttributeNames ? false
}:
with ./lib.nix;
let
fix = f: let x = f x // { __unfix__ = f; }; in x;
extend = rattrs: f: self: let super = rattrs self; in super // f self super;
haskellPackages = self:
let
mkDerivation = pkgs.callPackage ./generic-builder.nix {
inherit stdenv;
inherit (pkgs) fetchurl pkgconfig glibcLocales coreutils gnugrep gnused;
inherit (self) ghc jailbreak-cabal;
hscolour = overrideCabal self.hscolour (drv: {
isLibrary = false;
noHaddock = true;
hyperlinkSource = false; # Avoid depending on hscolour for this build.
postFixup = "rm -rf $out/lib $out/share $out/nix-support";
});
};
overrideCabal = drv: f: drv.override (args: args // {
mkDerivation = drv: args.mkDerivation (drv // f drv);
});
callPackageWithScope = scope: drv: args: (stdenv.lib.callPackageWith scope drv args) // {
overrideScope = f: callPackageWithScope (fix (extend scope.__unfix__ f)) drv args;
};
defaultScope = pkgs // pkgs.xlibs // pkgs.gnome // self;
callPackage = drv: args: callPackageWithScope defaultScope drv args;
in
import ./hackage-packages.nix { inherit pkgs stdenv callPackage; } self // {
inherit mkDerivation callPackage;
ghcWithPackages = pkgs: callPackage ./with-packages-wrapper.nix { packages = pkgs self; };
ghc = ghc // { withPackages = self.ghcWithPackages; };
};
compatLayer = if provideOldAttributeNames then import ./compat-layer.nix else (self: super: {});
commonConfiguration = import ./configuration-common.nix { inherit pkgs; };
in
fix (extend (extend (extend (extend haskellPackages commonConfiguration) packageSetConfig) overrides) compatLayer)