feat(youtube): add YouTube browser window and Whisper subtitle source (#273)

launcher/commands/app-command.ts

@@ -4,6 +4,7 @@ import {
   launchTexthookerOnly,
   runAppCommandWithInherit,
 } from '../mpv.js';
+import { shouldForwardLogLevel } from '../types.js';
 import type { LauncherCommandContext } from './context.js';
 
 type AppCommandDeps = {
@@ -12,6 +13,10 @@ type AppCommandDeps = {
     appPath: string,
     logLevel: LauncherCommandContext['args']['logLevel'],
   ) => void;
+  launchYoutubeBrowserDetached: (
+    appPath: string,
+    logLevel: LauncherCommandContext['args']['logLevel'],
+  ) => void;
   launchAppBackgroundDetached: (
     appPath: string,
     logLevel: LauncherCommandContext['args']['logLevel'],
@@ -22,6 +27,11 @@ const defaultAppCommandDeps: AppCommandDeps = {
   runAppCommandWithInherit,
   launchSyncUiDetached: (appPath, logLevel) =>
     launchAppCommandDetached(appPath, ['--sync-window'], logLevel, 'sync-ui'),
+  launchYoutubeBrowserDetached: (appPath, logLevel) => {
+    const appArgs = ['--youtube-browser'];
+    if (shouldForwardLogLevel(logLevel)) appArgs.push('--log-level', logLevel);
+    launchAppCommandDetached(appPath, appArgs, logLevel, 'youtube-browser');
+  },
   launchAppBackgroundDetached,
 };
 
@@ -41,6 +51,10 @@ export function runAppPassthroughCommand(
     deps.launchSyncUiDetached(appPath, args.logLevel);
     return true;
   }
+  if (args.youtubeBrowser) {
+    deps.launchYoutubeBrowserDetached(appPath, args.logLevel);
+    return true;
+  }
   if (!args.appPassthrough) {
     return false;
   }

launcher/commands/command-modules.test.ts

@@ -207,6 +207,7 @@ test('app command starts default macOS background app detached from launcher', (
       calls.push('attached');
     },
     launchSyncUiDetached: () => calls.push('sync-ui'),
+    launchYoutubeBrowserDetached: () => calls.push('youtube'),
     launchAppBackgroundDetached: (appPath, logLevel) => {
       calls.push(`detached:${appPath}:${logLevel}`);
     },
@@ -227,6 +228,7 @@ test('app command starts default Linux background app detached from launcher', (
       calls.push('attached');
     },
     launchSyncUiDetached: () => calls.push('sync-ui'),
+    launchYoutubeBrowserDetached: () => calls.push('youtube'),
     launchAppBackgroundDetached: (appPath, logLevel) => {
       calls.push(`detached:${appPath}:${logLevel}`);
     },
@@ -248,6 +250,7 @@ test('app command keeps explicit passthrough args attached', () => {
       forwarded.push(appArgs);
     },
     launchSyncUiDetached: () => detached.push('sync-ui'),
+    launchYoutubeBrowserDetached: () => detached.push('youtube'),
     launchAppBackgroundDetached: () => {
       detached.push('detached');
     },
@@ -266,6 +269,7 @@ test('sync UI command launches the app detached from the terminal', () => {
   const handled = runAppPassthroughCommand(context, {
     runAppCommandWithInherit: () => calls.push('piped'),
     launchSyncUiDetached: (appPath, logLevel) => calls.push(`sync-ui:${appPath}:${logLevel}`),
+    launchYoutubeBrowserDetached: () => calls.push('youtube'),
     launchAppBackgroundDetached: () => calls.push('detached'),
   });
 
@@ -273,6 +277,23 @@ test('sync UI command launches the app detached from the terminal', () => {
   assert.deepEqual(calls, ['sync-ui:/tmp/subminer.app:warn']);
 });
 
+test('youtube command launches the YouTube browser detached from the terminal', () => {
+  const context = createContext();
+  context.args.youtubeBrowser = true;
+  const calls: string[] = [];
+
+  const handled = runAppPassthroughCommand(context, {
+    runAppCommandWithInherit: () => calls.push('piped'),
+    launchSyncUiDetached: () => calls.push('sync-ui'),
+    launchYoutubeBrowserDetached: (appPath, logLevel) =>
+      calls.push(`youtube:${appPath}:${logLevel}`),
+    launchAppBackgroundDetached: () => calls.push('detached'),
+  });
+
+  assert.equal(handled, true);
+  assert.deepEqual(calls, ['youtube:/tmp/subminer.app:warn']);
+});
+
 test('mpv pre-app command exits non-zero when socket is not ready', async () => {
   const context = createContext();
   context.args.mpvStatus = true;

launcher/commands/playback-command.test.ts

@@ -16,20 +16,9 @@ function createContext(): LauncherCommandContext {
       recursive: false,
       profile: '',
       startOverlay: false,
-      youtubeMode: 'download',
-      whisperBin: '',
-      whisperModel: '',
-      whisperVadModel: '',
-      whisperThreads: 0,
-      youtubeSubgenOutDir: '',
-      youtubeSubgenAudioFormat: '',
-      youtubeSubgenKeepTemp: false,
-      youtubeFixWithAi: false,
       youtubePrimarySubLangs: [],
       youtubeSecondarySubLangs: [],
       youtubeAudioLangs: [],
-      youtubeWhisperSourceLanguage: '',
-      aiConfig: {},
       useTexthooker: false,
       autoStartOverlay: false,
       texthookerOnly: false,
@@ -63,6 +52,7 @@ function createContext(): LauncherCommandContext {
       logsExport: false,
       version: false,
       settings: false,
+      youtubeBrowser: false,
       configPath: false,
       configShow: false,
       mpvIdle: false,
@@ -162,7 +152,7 @@ test('youtube playback launches overlay with app-owned youtube flow args', async
 
   assert.deepEqual(calls, [
     'startMpv',
-    'startOverlay:--youtube-play https://www.youtube.com/watch?v=65Ovd7t8sNw --youtube-mode download',
+    'startOverlay:--youtube-play https://www.youtube.com/watch?v=65Ovd7t8sNw',
   ]);
   assert.equal(receivedStartMpvOptions[0]?.startPaused, true);
   assert.equal(receivedStartMpvOptions[0]?.disableYoutubeSubtitleAutoLoad, true);

launcher/commands/playback-command.ts

@@ -240,7 +240,6 @@ export async function runPlaybackCommandWithDeps(
 
   const isYoutubeUrl = selectedTarget.kind === 'url' && isYoutubeTarget(selectedTarget.target);
   const isAppOwnedYoutubeFlow = isYoutubeUrl;
-  const youtubeMode = args.youtubeMode ?? 'download';
   const configDir = getLauncherConfigDir();
 
   if (isYoutubeUrl) {
@@ -325,7 +324,7 @@ export async function runPlaybackCommandWithDeps(
       );
     }
     const extraAppArgs = isAppOwnedYoutubeFlow
-      ? ['--youtube-play', selectedTarget.target, '--youtube-mode', youtubeMode]
+      ? ['--youtube-play', selectedTarget.target]
       : shouldLauncherAttachRunningApp
         ? [
             pluginRuntimeConfig.autoStartVisibleOverlay