Add package.nix and cleanup build process

package.nix

@@ -0,0 +1,54 @@
+{ 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 = ''
+    ./setup.sh
+  '';
+
+  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
+      ]}
+  '';
+}