working game, needs some touch up

package.nix

@@ -0,0 +1,89 @@
+{
+  lib,
+  python3Packages,
+  gtk4,
+  gobject-introspection,
+  wrapGAppsHook4,
+}:
+
+python3Packages.buildPythonApplication rec {
+  pname = "shikaku";
+  version = "0.1.0";
+  pyproject = false;
+
+  src = ./.;
+
+  nativeBuildInputs = [
+    gobject-introspection
+    wrapGAppsHook4
+  ];
+
+  buildInputs = [
+    gtk4
+  ];
+
+  dependencies = with python3Packages; [
+    pygobject3
+  ];
+
+  # Pure Python — nothing to compile
+  dontBuild = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm755 shikaku.py $out/share/shikaku/shikaku.py
+
+    # Wrapper script so wrapGAppsHook4 can inject GDK/GI env vars
+    mkdir -p $out/bin
+    cat > $out/bin/shikaku << EOF
+    #!${python3Packages.python.interpreter}
+    import sys
+    sys.path.insert(0, "$out/share/shikaku")
+    import shikaku
+    shikaku.main()
+    EOF
+    chmod +x $out/bin/shikaku
+
+    # Desktop entry for app launchers (GNOME, KDE, etc.)
+    install -Dm644 /dev/stdin $out/share/applications/shikaku.desktop << EOF
+    [Desktop Entry]
+    Version=1.0
+    Type=Application
+    Name=Shikaku
+    Comment=Rectangle partition logic puzzle
+    Exec=shikaku
+    Icon=applications-games
+    Terminal=false
+    Categories=Game;LogicGame;BoardGame;
+    Keywords=puzzle;shikaku;logic;grid;rectangle;
+    EOF
+
+    runHook postInstall
+  '';
+
+  # wrapGAppsHook4 handles GDK_PIXBUF_MODULE_FILE, XDG_DATA_DIRS, GI_TYPELIB_PATH, etc.
+  # but it expects to wrap a binary. Point it at our wrapper script.
+  dontWrapGApps = false;
+
+  passthru.tests.shikaku-starts = python3Packages.pytestCheckHook;
+
+  meta = {
+    description = "Rectangle partition logic puzzle (Shikaku)";
+    longDescription = ''
+      Shikaku is a logic puzzle where you partition a grid into non-overlapping
+      rectangles. Each rectangle must contain exactly one number, and that number
+      equals the area of the rectangle in cells. Puzzles are procedurally generated
+      and guaranteed to be solvable. Supports 5×5 and 7×7 grids, with larger sizes
+      planned. Built with Python and GTK4; plays fully offline.
+    '';
+    homepage = "https://github.com/your-github-username/shikaku"; # TODO
+    # changelog = "https://github.com/your-github-username/shikaku/blob/v${version}/CHANGELOG.md";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [
+      # your-nixpkgs-handle  # TODO: add yourself to maintainers/maintainer-list.nix first
+    ];
+    platforms = lib.platforms.linux;
+    mainProgram = "shikaku";
+  };
+}