{ pkgs ? (import <nixpkgs> {})
, pythonPackages ? "python27Packages"
}:

with pkgs.lib;

let
  _pythonPackages = pythonPackages;

in

let
  pythonPackages = getAttr _pythonPackages pkgs;

  pip2nix = import ./nix-common/pip2nix.nix {
    inherit
      pkgs
      pythonPackages;
  };

in

pkgs.stdenv.mkDerivation {
  name = "pip2nix-generated";

  buildInputs = [
    # Allows to generate python packages
    pip2nix.pip2nix
    pip2nix.pip
    pip2nix.pip-tools

    # compile using ffi
    pkgs.libffi

    pythonPackages.cython

    # Allows to generate node dependencies
    pkgs.nodePackages.node2nix

    # We need mysql_config to be around
    pkgs.libmysqlclient

    # We need postgresql to be around
    pkgs.postgresql

    # we need the below for saml
    pkgs.libxml2
    pkgs.libxslt
    pkgs.xmlsec

    # Curl is needed for pycurl
    pkgs.curl
  ];

  shellHook = ''
    runHook preShellHook
    runHook postShellHook
  '';

  preShellHook = ''
    echo "Starting Generate Shell"
    # set unpack source date to 1980 to fix ZIP problems that does not support <1980
    export SOURCE_DATE_EPOCH=315532800
    export TMPDIR=/tmp
    export LOCALE_ARCHIVE="${pkgs.glibcLocales}/lib/locale/locale-archive"
    export LC_ALL="en_US.UTF-8"
    export PYCURL_SSL_LIBRARY=openssl

    # Custom prompt to distinguish from other dev envs.
    export PS1="\n\[\033[1;32m\][pip2nix-generate-shell]$\[\033[0m\] "

  '';
}