shell.nix

{ nixpkgs ? import <nixpkgs> { overlays = [ (import ./reflex-dom.nix) ]; }, compiler ? "default", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  f = { mkDerivation, base, containers, Dist, fgl, force-layout
      , generic-lens, jsaddle-warp, lens, linear, MonadRandom, mtl
      , random, reflex, reflex-dom, stdenv, text, these, threepenny-gui
      , time, z3
      }:
      mkDerivation {
        pname = "project";
        version = "0.1.0.0";
        src = ./.;
        isLibrary = true;
        isExecutable = true;
        libraryHaskellDepends = [
          base containers Dist fgl force-layout generic-lens jsaddle-warp
          lens linear MonadRandom mtl random reflex reflex-dom text these
          threepenny-gui time z3
        ];
        executableHaskellDepends = [ base ];
        license = "unknown";
        hydraPlatforms = stdenv.lib.platforms.none;
      };

  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