{ pkgs ? import <nixpkgs> {}, mode ? "shell" }:

with pkgs.lib;

let

modes = {
  shell = "exec fish";
  test  = "exec yarn test";
  run   = "exec bin/hubot -a matrix";
};

in pkgs.stdenv.mkDerivation rec {
  name = "asjon-dev";
  source = ".";

  buildInputs = with pkgs; [
    nodejs nodePackages.coffee-script
    yarn openssh graphicsmagick
  ];

  shellHook = environment + getAttr mode modes;
  environment = ''
    #set env variables here
    export PATH="node_modules/.bin:$PATH"
    export AUTO_KILL_ON_UPDATE=1
  '';
}