dansho.nix

{ nixpkgs ? import <nixpkgs> { config.allowBroken = true; },
  compiler ? "default",
  doBenchmark ? false
}:

let
  inherit (nixpkgs) pkgs;
  extension = with pkgs.haskell.lib; hself: hsuper: {
    random-source = doJailbreak hsuper.random-source;
    random-fu = doJailbreak hsuper.random-fu;
  };
  f = { mkDerivation, base, hmatrix, random, random-fu, stdenv, vector }:
      mkDerivation {
        pname = "mypackage";
        version = "0.1.0.0";
        src = ./.;
        isLibrary = true;
        isExecutable = true;
        libraryHaskellDepends = [base hmatrix random random-fu vector];
        executableHaskellDepends = [base hmatrix random-fu];
        license = stdenv.lib.licenses.bsd3;
      };
  haskellPackages = if compiler == "default"
    then pkgs.haskellPackages.extend extension
    else pkgs.haskell.packages.${compiler}.extend extension;
  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;
  drv = variant (haskellPackages.callPackage f {});

in
  if pkgs.lib.inNixShell then drv.env else drv