shell.nix

let
  pkgs = import <nixpkgs> {};
in pkgs.stdenv.mkDerivation rec {

  name = "some_ruby_app";

  buildInputs = with pkgs; [
    ctags
    neovim
    bundler 
    bundix
    git
    libiconv
    libxml2
    libxslt
    bzip2
    zlib
    pkgconfig
    imagemagickBig
    readline
    sqlite
    openssl
    postgresql
    redis
    ruby_2_5
];
  
  shellHook = ''
   echo "setting up shell"
   export LIBXML2_DIR=${pkgs.libxml2}
   export LIBXSLT_DIR=${pkgs.libxslt}
   export GEM_HOME=$PWD/.nix-gems
   export GEM_PATH=$out/vendor/cache:$GEM_HOME
   export PATH=$GEM_HOME/bin:$PATH
  '';

}