feat(launcher): Launch using discrete graphics

Author: mmstick

src/app_info.ts

@@ -47,6 +47,12 @@ export class AppInfo {
         return this.app_info.filename;
     }
 
+    id(): string {
+        let name = this.filename
+        name = name.substr(0, name.lastIndexOf('.'))
+        return name.substr(name.lastIndexOf('/') + 1)
+    }
+
     categories(): string {
         return this.categories_.get_or_init(() => this.app_info.get_categories());
     }

src/dedicated_gpu.ts

@@ -0,0 +1,46 @@
+import type { AppInfo } from './app_info'
+
+const { Shell, St } = imports.gi;
+const AppDisplay = imports.ui.appDisplay;
+
+const PopupMenu = imports.ui.popupMenu
+const Main = imports.ui.main
+
+const appSys = Shell.AppSystem.get_default()
+
+export function addPopup(info: AppInfo, widget: any) {
+    // GNOME Shell already tracks if a discrete GPU is available.
+    // We will only add a popup if one is available.
+    if (!AppDisplay.discreteGpuAvailable) return
+
+    const menu = new PopupMenu.PopupMenu(widget, 0.0, St.Side.TOP, 0)
+    Main.uiGroup.add_actor(menu.actor)
+    menu.actor.hide()
+    menu.actor.add_style_class_name('panel-menu');
+
+    const appPrefersNonDefaultGPU = info.app_info.get_boolean('PrefersNonDefaultGPU');
+    const gpuPref = appPrefersNonDefaultGPU
+        ? Shell.AppLaunchGpu.DEFAULT
+        : Shell.AppLaunchGpu.DISCRETE;
+
+    const menu_item = appendMenuItem(menu, appPrefersNonDefaultGPU
+        ? _('Launch using Integrated Graphics Card')
+        : _('Launch using Discrete Graphics Card'));
+
+    menu_item.connect('activate', () => {
+        appSys.lookup_desktop_wmclass(info.id())?.launch(0, -1, gpuPref)
+    });
+
+    // Intercept right click events on the launcher app's button
+    widget.connect('button-press-event', (_: any, event: any) => {
+        if (event.get_button() === 3) {
+            menu.toggle()
+        }
+    })
+}
+
+function appendMenuItem(menu: any, label: string) {
+    let item = new PopupMenu.PopupMenuItem(label);
+    menu.addMenuItem(item);
+    return item
+}

src/dialog_launcher.ts

@@ -3,6 +3,7 @@ const Me = imports.misc.extensionUtils.getCurrentExtension();
 
 import * as app_info from 'app_info';
 import * as error from 'error';
+import * as DedicatedGPU from 'dedicated_gpu';
 import * as launch from 'launcher_service';
 import * as levenshtein from 'levenshtein';
 import * as lib from 'lib';
@@ -123,6 +124,8 @@ export class Launcher extends search.Search {
                         { app }
                     )
 
+                    DedicatedGPU.addPopup(app, button.widget)
+
                     this.options.push(button)
                 }
             }

src/launcher_service.ts

@@ -130,7 +130,7 @@ export class LauncherService {
                 yield plugin
             }
         }
-        
+
         for (const plugin of this.plugins.values()) {
             if (!plugin.pattern || plugin.pattern.test(query)) {
                 yield plugin