feat(resources): provide desktop file (#870)

* feat(resources): provide desktop file

Co-authored-by: Florian Zier <9168602+zierf@users.noreply.github.com>

* fix(ts_qt): remove duplicate logic

* fix(ts_qt): add fallback values

---------

Co-authored-by: Florian Zier <9168602+zierf@users.noreply.github.com>

nix/package/default.nix

@@ -64,6 +64,14 @@ buildPythonApplication {
     syrupy
   ];
 
+  # TODO: Install more icon resolutions when available.
+  preInstall = ''
+    mkdir -p $out/share/applications $out/share/icons/hicolor/512x512/apps
+
+    cp $src/src/tagstudio/resources/tagstudio.desktop $out/share/applications
+    cp $src/src/tagstudio/resources/icon.png $out/share/icons/hicolor/512x512/apps/tagstudio.png
+  '';
+
   makeWrapperArgs =
     [ "--prefix PATH : ${lib.makeBinPath [ ffmpeg-headless ]}" ]
     ++ lib.optional stdenv.hostPlatform.isLinux "--prefix LD_LIBRARY_PATH : ${

src/tagstudio/qt/ts_qt.py

@@ -299,10 +299,15 @@ class QtDriver(DriverMixin, QObject):
             appid = "cyanvoxel.tagstudio.9"
             ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(appid)  # type: ignore[attr-defined,unused-ignore]
 
-        if sys.platform != "darwin":
-            icon = QIcon()
-            icon.addFile(str(self.rm.get_path("icon")))
-            app.setWindowIcon(icon)
+        app.setApplicationName("tagstudio")
+        app.setApplicationDisplayName("TagStudio")
+        if platform.system() != "Darwin":
+            fallback_icon = QIcon()
+            fallback_icon.addFile(str(self.rm.get_path("icon")))
+            app.setWindowIcon(QIcon.fromTheme("tagstudio", fallback_icon))
+
+            if platform.system() != "Windows":
+                app.setDesktopFileName("tagstudio")
 
         # Initialize the Tag Manager panel
         self.tag_manager_panel = PanelModal(

src/tagstudio/resources/tagstudio.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Type=Application
+Name=TagStudio
+GenericName=Tag Management System
+Comment=Tag, find, and organize files
+Icon=tagstudio
+Exec=tagstudio
+Terminal=false
+Categories=AudioVideo;Qt;
+Keywords=files;folders;tags;