{ stdenv
, ruby
, makeWrapper
, pkg-config
, xorg
, rubyPackages
, gcc
, lib
}:

stdenv.mkDerivation {
  pname = "kutu";
  version = "0.1.0";

  src = ./.;

  nativeBuildInputs = [
    pkg-config
    makeWrapper
    gcc
  ];

  buildInputs = [
    (ruby.withPackages (ps: [
      ps.ffi
    ]))
    xorg.libxcb
    xorg.xcbutilwm
    xorg.xrandr
    xorg.xprop
  ];

  buildPhase = ''
    mkdir -p build

    gcc -shared -fPIC \
      -Wall -Wextra \
      -o build/X-kutu.so \
      src/c/X-kutu.c \
      $(pkg-config --libs --cflags xcb xcb-icccm);
  '';

  installPhase = ''
    mkdir -p $out/bin
    mkdir -p $out/build
    mkdir -p $out/src

    cp bin/kutu.rb $out/bin/kutu.rb
    cp bin/kutu-run.rb $out/bin/kutu-run.rb

    cp build/X-kutu.so $out/build/
    cp -r src/. $out/src/

    wrapProgram $out/bin/kutu.rb \
      --prefix PATH : ${lib.makeBinPath [
        xorg.xrandr
        xorg.xprop
      ]}
  '';
}