about summary refs log tree commit diff
path: root/buildHaskell/default.nix
blob: 5958b1ea26ae624fb18daab3d073b3aefe78ebd2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
{ pkgs, ... }:

{
  # Create a nix-shell for Haskell development.
  shell = { deps }: let
    ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
  in pkgs.mkShell {
    buildInputs = [ghc];
  };

  # Build a Haskell executable. This assumes a project directory with a
  # top-level Main.hs.
  # - `name`: You can find the result at ./result/$name
  # - `srcs`: Will be passed to `srcs` field of `pkgs.stdenv.mkDerivation`.
  # - `deps`: A function that accepts `hpkgs` and returns a list of Haskell
  # - `ghcExtensions`: A list of strings representing the language extensions to
  #   use.
  program = { name, srcs, deps, ghcExtensions }: let
    ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
  in pkgs.stdenv.mkDerivation {
    name = name;
    buildInputs = [];
    srcs = srcs;
    buildPhase = ''
      ${ghc}/bin/ghc -Wall Main.hs ${pkgs.lib.concatMapStrings (x: "-X${x} ") ghcExtensions}
    '';
    installPhase = ''
      mkdir -p $out && mv Main $out/${name}
    '';
  };
}