nix: add packaging; update devshell

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I9f1ddf6dbd141b5a85b4b5a36c2c9a586a6a6964

nix/package.nix

@@ -0,0 +1,65 @@
+{
+  lib,
+  stdenv,
+  wayland,
+  wayland-protocols,
+  wayland-scanner,
+  libxkbcommon,
+  libGL,
+  mesa,
+  glibc,
+  pkg-config,
+}: let
+  fs = lib.fileset;
+  s = ../.;
+in
+  stdenv.mkDerivation {
+    pname = "chroma";
+    version = "1.0.0";
+
+    src = fs.toSource {
+      root = s;
+      fileset = fs.unions [
+        (s + /include)
+        (s + /protocols)
+        (s + /src)
+
+        (s + /Makefile)
+      ];
+    };
+
+    buildInputs = [
+      # Wayland libraries
+      wayland.dev
+      wayland-protocols
+      wayland-scanner
+      libxkbcommon
+
+      # EGL/OpenGL libraries
+      libGL
+      mesa
+
+      # System libraries
+      glibc.dev
+    ];
+
+    nativeBuildInputs = [
+      pkg-config
+    ];
+
+    makeFlags = [
+      "PREFIX=$(out)"
+      "SYSTEMD_DIR=$(out)/lib/systemd/system"
+    ];
+
+    postInstall = ''
+      install -Dm755 ${../chroma.conf.sample} $out/share/chroma.conf.sample
+    '';
+
+    meta = {
+      description = "Super-fast, lightweight and efficient wallpaper daemon for Wayland compositors";
+      license = lib.licenses.mpl20;
+      mainProgram = "chroma";
+      maintainers = with lib.maitainers; [NotAShelf];
+    };
+  }