shell.nix

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

let

  inherit (nixpkgs) pkgs;

  f = { mkDerivation, acme-iot, base, csound-catalog
      , csound-expression, csound-sampler, distributive, extra, hpack
      , lens, lib, listsafe, MonadRandom, mtl, random, random-shuffle
      , sort, split
      }:
      mkDerivation {
        pname = "funktor";
        version = "0.1.0.0";
        src = ./.;
        isLibrary = true;
        isExecutable = true;
        libraryHaskellDepends = [
          acme-iot base csound-catalog csound-expression csound-sampler
          distributive extra lens listsafe MonadRandom mtl random
          random-shuffle sort split
        ];
        libraryToolDepends = [ hpack ];
        executableHaskellDepends = [
          acme-iot base csound-catalog csound-expression csound-sampler
          distributive extra lens listsafe MonadRandom mtl random
          random-shuffle sort split
        ];
        testHaskellDepends = [
          acme-iot base csound-catalog csound-expression csound-sampler
          distributive extra lens listsafe MonadRandom mtl random
          random-shuffle sort split
        ];
        prePatch = "hpack";
        homepage = "https://github.com/harryaskham/funktor#readme";
        license = lib.licenses.bsd3;
      };

  haskellPackages = if compiler == "default"
                       then pkgs.haskellPackages
                       else pkgs.haskell.packages.${compiler};

  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