add lua builder

flake.nix

@@ -29,6 +29,11 @@
         outputs = ["out" "dev"];
       };
   in {
+    mkLuaPackage = import ./nix/lua.nix {
+      inherit pkgs;
+      astal = self;
+    };
+
     packages.${system} = with pkgs; {
       docs = import ./docs {inherit self pkgs;};
       default = self.packages.${system}.astal;

nix/lua.nix

@@ -0,0 +1,58 @@
+defaults: {
+  pkgs ? defaults.pkgs,
+  astal ? defaults.astal,
+  name ? "astal-lua",
+  src,
+  extraLuaPackages ? (ps: []),
+  extraPacakges ? [],
+}: let
+  lua = pkgs.lua.withPackages (ps:
+    (extraLuaPackages ps)
+    ++ [
+      ps.lgi
+      (ps.luaPackages.toLuaModule (pkgs.stdenv.mkDerivation {
+        name = "astal";
+        version = "0.1.0";
+        src = "${astal}/core/lua";
+        dontBuild = true;
+        installPhase = ''
+          mkdir -p $out/share/lua/${ps.lua.luaversion}/astal
+          cp -r astal/* $out/share/lua/${ps.lua.luaversion}/astal
+        '';
+      }))
+    ]);
+
+  nativeBuildInputs = with pkgs; [
+    wrapGAppsHook
+    gobject-introspection
+  ];
+
+  buildInputs =
+    extraPacakges
+    ++ [
+      lua
+      astal.packages.${pkgs.system}.default
+    ];
+
+  script = pkgs.writeScript "astal-lua" ''
+    #!${lua}/bin/lua
+    package.path = package.path .. ";${src}/?.lua"
+    require "app"
+  '';
+in
+  pkgs.stdenv.mkDerivation {
+    inherit nativeBuildInputs buildInputs src name;
+
+    installPhase = ''
+      mkdir -p $out/bin
+      cp -r * $out/bin
+      cp ${script} $out/bin/${name}
+      chmod +x $out/bin/${name}
+    '';
+
+    preFixup = ''
+      gappsWrapperArgs+=(
+        --prefix PATH : ${pkgs.lib.makeBinPath extraPacakges}
+      )
+    '';
+  }