feat: Add Nix Flake support to Breezy

.nix/packages/breezy-gnome/default.nix

@@ -0,0 +1,65 @@
+{
+  self,
+  version,
+  lib,
+  stdenv,
+  glib,
+}:
+let
+  extensionUuid = "breezydesktop@xronlinux.com";
+in
+stdenv.mkDerivation (finalAttrs: {
+  pname = "gnome-shell-extension-breezy-desktop";
+  inherit version;
+
+  src = self;
+
+  nativeBuildInputs = [
+    glib # for glib-compile-schemas
+  ];
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  passthru = {
+    inherit extensionUuid;
+  };
+
+  installPhase = ''
+    runHook preInstall
+
+    extDir=$out/share/gnome-shell/extensions/${extensionUuid}
+    mkdir -p $extDir
+
+    # JavaScript source files
+    cd gnome/src
+    for f in *.js metadata.json; do
+      install -Dm644 "$f" "$extDir/$f"
+    done
+
+    # Fragment shader (resolve symlink)
+    cp -L Sombrero.frag "$extDir/Sombrero.frag"
+
+    # D-Bus interfaces
+    mkdir -p "$extDir/dbus-interfaces"
+    cp dbus-interfaces/*.xml "$extDir/dbus-interfaces/"
+
+    # Textures (resolve symlinks)
+    mkdir -p "$extDir/textures"
+    cp -L textures/* "$extDir/textures/"
+
+    # GSettings schema (resolve symlink and compile)
+    mkdir -p "$extDir/schemas"
+    cp -L schemas/*.xml "$extDir/schemas/"
+    glib-compile-schemas "$extDir/schemas"
+
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "GNOME Shell extension for Breezy Desktop XR virtual display";
+    homepage = "https://github.com/wheaney/breezy-desktop";
+    license = lib.licenses.gpl3Only;
+    platforms = lib.platforms.linux;
+  };
+})

.nix/packages/breezy-kde/default.nix

@@ -0,0 +1,89 @@
+{
+  self,
+  version,
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  pkg-config,
+  kdePackages,
+  libepoxy,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "breezy-kwin";
+  inherit version;
+
+  src = self;
+
+  sourceRoot = ".";
+
+  unpackPhase = ''
+    cp -r $src $TMPDIR/breezy-desktop
+    chmod -R u+w $TMPDIR/breezy-desktop
+    cd $TMPDIR/breezy-desktop/kwin
+  '';
+
+  nativeBuildInputs = [
+    cmake
+    kdePackages.extra-cmake-modules
+    kdePackages.wrapQtAppsHook
+    pkg-config
+  ];
+
+  buildInputs = with kdePackages; [
+    kconfig
+    kconfigwidgets
+    kcoreaddons
+    kglobalaccel
+    ki18n
+    kcmutils
+    kwindowsystem
+    kxmlgui
+    kwin
+    qtbase
+    qtdeclarative
+    qt3d
+    qtquick3d
+    libepoxy
+  ];
+
+  postPatch = ''
+        # VERSION is read relative to kwin/src/../VERSION = kwin/VERSION
+        # and also from kwin/../VERSION for the top-level CMakeLists.txt
+        echo "${finalAttrs.version}" > ../VERSION
+        echo "${finalAttrs.version}" > VERSION
+
+        # Copy files expected by CMake install but located elsewhere in the mono-repo
+        cp ../ui/modules/PyXRLinuxDriverIPC/xrdriveripc.py src/xrdriveripc/xrdriveripc.py
+        cp ../ui/data/icons/hicolor/scalable/apps/com.xronlinux.BreezyDesktop.svg src/kcm/com.xronlinux.BreezyDesktop.svg
+
+        # Fix hardcoded /usr/include/kwin path
+        substituteInPlace cmake/info.cmake \
+          --replace-fail '/usr/include/kwin/effect/effect.h' \
+                         '${kdePackages.kwin.dev}/include/kwin/effect/effect.h'
+
+        # Fix QtQuick3D QML module detection - bypass qmake query
+        substituteInPlace CMakeLists.txt \
+          --replace-fail 'execute_process(
+        COMMAND ''${QT6_QMAKE_EXECUTABLE} -query QT_INSTALL_QML
+        OUTPUT_VARIABLE QT6_QML_DIR
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )' 'set(QT6_QML_DIR "${kdePackages.qtquick3d}/lib/qt-6/qml")'
+
+        # Remove the hardcoded /usr/include reference
+        substituteInPlace src/CMakeLists.txt \
+          --replace-fail 'target_include_directories(breezy_desktop PRIVATE /usr/include/kwin)' \
+                         'target_include_directories(breezy_desktop PRIVATE ${kdePackages.kwin.dev}/include/kwin)'
+  '';
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=Release"
+  ];
+
+  meta = {
+    description = "KWin effect plugin for Breezy Desktop XR virtual display";
+    homepage = "https://github.com/wheaney/breezy-desktop";
+    license = lib.licenses.gpl3Only;
+    platforms = lib.platforms.linux;
+  };
+})

.nix/packages/breezy-ui/default.nix

@@ -0,0 +1,91 @@
+{
+  self,
+  version,
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  meson,
+  ninja,
+  pkg-config,
+  gettext,
+  glib,
+  gtk4,
+  libadwaita,
+  desktop-file-utils,
+  gobject-introspection,
+  wrapGAppsHook4,
+  python3Packages,
+  python3,
+  gst_all_1,
+  appstream,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "breezy-desktop-ui";
+  inherit version;
+
+  # Use the ui/ subtree but need root for VERSION file
+  src = self;
+  sourceRoot = "ui";
+
+  # The source is a nix store path, not a directory name
+  unpackPhase = ''
+    cp -r $src $TMPDIR/breezy-desktop
+    chmod -R u+w $TMPDIR/breezy-desktop
+    cd $TMPDIR/breezy-desktop/ui
+    sourceRoot=$(pwd)
+  '';
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+    gettext
+    glib # glib-compile-schemas
+    gtk4 # gtk-update-icon-cache
+    desktop-file-utils
+    gobject-introspection
+    wrapGAppsHook4
+    appstream # appstreamcli for validation
+  ];
+
+  buildInputs = [
+    gtk4
+    libadwaita
+    glib
+    gst_all_1.gstreamer
+    gst_all_1.gst-plugins-base
+    (python3.withPackages (
+      ps: with ps; [
+        pygobject3
+        pydbus
+      ]
+    ))
+  ];
+
+  # Patch the entry scripts to use Nix store paths instead of XDG_DATA_HOME
+  postPatch = ''
+    substituteInPlace src/breezydesktop.in \
+      --replace-fail "appdir = os.getenv('APPDIR', xdg_data_home)" \
+                     "appdir = os.getenv('APPDIR', '$out/share')"
+    substituteInPlace src/virtualdisplay.in \
+      --replace-fail "appdir = os.getenv('APPDIR', xdg_data_home)" \
+                     "appdir = os.getenv('APPDIR', '$out/share')" || true
+
+    # Upstream bug: virtualdisplayrow.py is missing from meson.build install list
+    substituteInPlace src/meson.build \
+      --replace-fail "'virtualdisplay.py'," "'virtualdisplay.py', 'virtualdisplayrow.py',"
+  '';
+
+  # Skip tests that need network or display
+  mesonFlags = [
+  ];
+
+  # wrapGAppsHook4 handles GI_TYPELIB_PATH, GDK_PIXBUF, etc.
+
+  meta = {
+    description = "GTK4 settings UI for Breezy Desktop XR";
+    homepage = "https://github.com/wheaney/breezy-desktop";
+    license = lib.licenses.gpl3Only;
+    platforms = lib.platforms.linux;
+  };
+})

.nix/packages/breezy-vulkan/default.nix

@@ -0,0 +1,60 @@
+{
+  self,
+  version,
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  meson,
+  ninja,
+  pkg-config,
+  glslang,
+  spirv-headers,
+  vulkan-headers,
+  vulkan-loader,
+  libx11,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "breezy-vulkan";
+  inherit version;
+
+  src = "${self}/vulkan/modules/vkBasalt";
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+    glslang
+  ];
+
+  buildInputs = [
+    spirv-headers
+    vulkan-headers
+    vulkan-loader
+    libx11
+  ];
+
+  postInstall =
+    let
+      sombreroSrc = "${self}/modules/sombrero";
+      vulkanSrc = "${self}/vulkan";
+    in
+    ''
+      # Install sombrero shaders
+      mkdir -p $out/share/breezy-vulkan/shaders
+      cp ${sombreroSrc}/Sombrero.frag $out/share/breezy-vulkan/shaders/
+      cp ${sombreroSrc}/calibrating.png $out/share/breezy-vulkan/shaders/ || true
+
+      # Install breezy vulkan config
+      install -Dm644 ${vulkanSrc}/config/vkBasalt.conf $out/share/breezy-vulkan/vkBasalt.conf
+
+      # Install custom banner
+      cp ${vulkanSrc}/custom_banner.png $out/share/breezy-vulkan/ || true
+    '';
+
+  meta = {
+    description = "Vulkan post-processing layer for Breezy Desktop XR gaming";
+    homepage = "https://github.com/wheaney/breezy-desktop";
+    license = lib.licenses.gpl3Only;
+    platforms = [ "x86_64-linux" ];
+  };
+})