shell.nix

# shell.nix for nix-shell
# Overrideable ghc version by passing `compiler` argument
# Example:
# $ nix-shell shell.nix --argstr compiler ghc7103
#
# To list avaliable ghc version:
# $ nix-env -qaPA nixos.haskell.compiler

{ pkgs ? import <nixpkgs> {}, compiler ? "default" }:

with pkgs;

with (if compiler == "default"
        then haskellPackages
        else haskell.packages.${compiler});

let
  ghc = ghcWithPackages (ps: with ps; [
          gloss
        ]);
in
  mkShell {
    name = "${compiler}-sh";

    buildInputs = [ ghc cabal-install ];

    shellHook = ''
      eval "$(egrep ^export "$(type -p ghc)")"
      export PS1="\[\033[1;32m\][$name:\W]\n$ \[\033[0m\]"
      export GHCRTS='-M1G'
    '';
}