Fix launcher backend parsing and yt-dlp overrides

changes/273-launcher-windows-backend-and-ytdlp-bin.md

@@ -0,0 +1,5 @@
+type: fixed
+area: launcher
+
+- Added `windows` as a recognized launcher backend option and auto-detection target on Windows.
+- Honored `SUBMINER_YTDLP_BIN` consistently across YouTube playback URL resolution, track probing, subtitle downloads, and metadata probing.

docs-site/architecture.md

@@ -74,7 +74,7 @@ src/
     handlers/              # Keyboard/mouse interaction modules
     modals/                # Jimaku/Kiku/subsync/runtime-options/session-help modals
     positioning/           # Subtitle position controller (drag-to-reposition)
-  window-trackers/         # Backend-specific tracker implementations (Hyprland, Sway, X11, macOS)
+  window-trackers/         # Backend-specific tracker implementations (Hyprland, Sway, X11, macOS, Windows)
   jimaku/                  # Jimaku API integration helpers
   subsync/                 # Subtitle sync (alass/ffsubsync) helpers
   subtitle/                # Subtitle processing utilities

docs-site/launcher-script.md

@@ -98,7 +98,7 @@ Use `subminer <subcommand> -h` for command-specific help.
 | `-T, --no-texthooker` | Disable texthooker server                           |
 | `-p, --profile`       | mpv profile name (default: `subminer`)              |
 | `-a, --args`          | Pass additional mpv arguments as a quoted string      |
-| `-b, --backend`       | Force window backend (`hyprland`, `sway`, `x11`)    |
+| `-b, --backend`       | Force window backend (`hyprland`, `sway`, `x11`, `macos`, `windows`)    |
 | `--log-level`         | Logger verbosity (`debug`, `info`, `warn`, `error`) |
 | `--dev`, `--debug`    | Enable app dev-mode (not tied to log level)         |
 

docs-site/mpv-plugin.md

@@ -79,7 +79,7 @@ texthooker_enabled=yes
 # Port for the texthooker server.
 texthooker_port=5174
 
-# Window manager backend: auto, hyprland, sway, x11, macos.
+# Window manager backend: auto, hyprland, sway, x11, macos, windows.
 backend=auto
 
 # Start the overlay automatically when a file is loaded.

launcher/config/args-normalizer.ts

@@ -49,10 +49,17 @@ function parseLogLevel(value: string): LogLevel {
 }
 
 function parseBackend(value: string): Backend {
-  if (value === 'auto' || value === 'hyprland' || value === 'x11' || value === 'macos') {
+  if (
+    value === 'auto' ||
+    value === 'hyprland' ||
+    value === 'sway' ||
+    value === 'x11' ||
+    value === 'macos' ||
+    value === 'windows'
+  ) {
     return value as Backend;
   }
-  fail(`Invalid backend: ${value} (must be auto, hyprland, x11, or macos)`);
+  fail(`Invalid backend: ${value} (must be auto, hyprland, sway, x11, macos, or windows)`);
 }
 
 function parseDictionaryTarget(value: string): string {

launcher/config/cli-parser-builder.test.ts

@@ -17,20 +17,20 @@ test('resolveTopLevelCommand respects the app alias after root options', () => {
 });
 
 test('parseCliPrograms keeps root options and target when no command is present', () => {
-  const result = parseCliPrograms(['--backend', 'x11', '/tmp/movie.mkv'], 'subminer');
+  const result = parseCliPrograms(['--backend', 'windows', '/tmp/movie.mkv'], 'subminer');
 
-  assert.equal(result.options.backend, 'x11');
+  assert.equal(result.options.backend, 'windows');
   assert.equal(result.rootTarget, '/tmp/movie.mkv');
   assert.equal(result.invocations.appInvocation, null);
 });
 
 test('parseCliPrograms routes app alias arguments through passthrough mode', () => {
   const result = parseCliPrograms(
-    ['--backend', 'macos', 'bin', '--anilist', '--log-level', 'debug'],
+    ['--backend', 'windows', 'bin', '--anilist', '--log-level', 'debug'],
     'subminer',
   );
 
-  assert.equal(result.options.backend, 'macos');
+  assert.equal(result.options.backend, 'windows');
   assert.deepEqual(result.invocations.appInvocation, {
     appArgs: ['--anilist', '--log-level', 'debug'],
   });

launcher/config/cli-parser-builder.ts

@@ -43,7 +43,7 @@ export interface CliInvocations {
 
 function applyRootOptions(program: Command): void {
   program
-    .option('-b, --backend <backend>', 'Display backend')
+    .option('-b, --backend <backend>', 'Display backend (auto, hyprland, sway, x11, macos, windows)')
     .option('-d, --directory <dir>', 'Directory to browse')
     .option('-a, --args <args>', 'Pass arguments to MPV')
     .option('-r, --recursive', 'Search directories recursively')

launcher/mpv.test.ts

@@ -8,6 +8,7 @@ import { EventEmitter } from 'node:events';
 import type { Args } from './types';
 import {
   cleanupPlaybackSession,
+  detectBackend,
   findAppBinary,
   launchAppCommandDetached,
   launchTexthookerOnly,
@@ -56,6 +57,22 @@ function createTempSocketPath(): { dir: string; socketPath: string } {
   return { dir, socketPath: path.join(dir, 'mpv.sock') };
 }
 
+function withPlatform<T>(platform: NodeJS.Platform, callback: () => T): T {
+  const originalDescriptor = Object.getOwnPropertyDescriptor(process, 'platform');
+  Object.defineProperty(process, 'platform', {
+    configurable: true,
+    value: platform,
+  });
+
+  try {
+    return callback();
+  } finally {
+    if (originalDescriptor) {
+      Object.defineProperty(process, 'platform', originalDescriptor);
+    }
+  }
+}
+
 test('mpv module exposes only canonical socket readiness helper', () => {
   assert.equal('waitForSocket' in mpvModule, false);
 });
@@ -102,6 +119,12 @@ test('parseMpvArgString preserves empty quoted tokens', () => {
   ]);
 });
 
+test('detectBackend resolves windows on win32 auto mode', () => {
+  withPlatform('win32', () => {
+    assert.equal(detectBackend('auto'), 'windows');
+  });
+});
+
 test('launchTexthookerOnly exits non-zero when app binary cannot be spawned', () => {
   const error = withProcessExitIntercept(() => {
     launchTexthookerOnly('/definitely-missing-subminer-binary', makeArgs());

launcher/mpv.ts

@@ -227,6 +227,7 @@ export function makeTempDir(prefix: string): string {
 
 export function detectBackend(backend: Backend): Exclude<Backend, 'auto'> {
   if (backend !== 'auto') return backend;
+  if (process.platform === 'win32') return 'windows';
   if (process.platform === 'darwin') return 'macos';
   const xdgCurrentDesktop = (process.env.XDG_CURRENT_DESKTOP || '').toLowerCase();
   const xdgSessionDesktop = (process.env.XDG_SESSION_DESKTOP || '').toLowerCase();

launcher/types.ts

@@ -68,7 +68,7 @@ export const DEFAULT_MPV_SUBMINER_ARGS = [
 ] as const;
 
 export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
-export type Backend = 'auto' | 'hyprland' | 'x11' | 'macos';
+export type Backend = 'auto' | 'hyprland' | 'sway' | 'x11' | 'macos' | 'windows';
 export type JimakuLanguagePreference = 'ja' | 'en' | 'none';
 
 export interface LauncherAiConfig {

plugin/subminer.conf

@@ -18,7 +18,7 @@ texthooker_enabled=yes
 # Texthooker WebSocket port
 texthooker_port=5174
 
-# Window manager backend: auto, hyprland, sway, x11
+# Window manager backend: auto, hyprland, sway, x11, macos, windows
 # "auto" detects based on environment variables
 backend=auto
 

src/core/services/youtube/metadata-probe.ts

@@ -1,5 +1,6 @@
 import { spawn } from 'node:child_process';
 import type { YoutubeVideoMetadata } from '../immersion-tracker/types';
+import { getYoutubeYtDlpCommand } from './ytdlp-command';
 
 const YOUTUBE_METADATA_PROBE_TIMEOUT_MS = 15_000;
 
@@ -87,7 +88,7 @@ function pickChannelThumbnail(thumbnails: YtDlpThumbnail[] | undefined): string
 export async function probeYoutubeVideoMetadata(
   targetUrl: string,
 ): Promise<YoutubeVideoMetadata | null> {
-  const { stdout } = await runCapture('yt-dlp', [
+  const { stdout } = await runCapture(getYoutubeYtDlpCommand(), [
     '--dump-single-json',
     '--no-warnings',
     '--skip-download',

src/core/services/youtube/playback-resolve.ts

@@ -1,4 +1,5 @@
 import { spawn } from 'node:child_process';
+import { getYoutubeYtDlpCommand } from './ytdlp-command';
 
 const YOUTUBE_PLAYBACK_RESOLVE_TIMEOUT_MS = 15_000;
 const DEFAULT_PLAYBACK_FORMAT = 'b';
@@ -88,8 +89,7 @@ export async function resolveYoutubePlaybackUrl(
   targetUrl: string,
   format = DEFAULT_PLAYBACK_FORMAT,
 ): Promise<string> {
-  const ytDlpCommand = process.env.SUBMINER_YTDLP_BIN?.trim() || 'yt-dlp';
+  const { stdout } = await runCapture(getYoutubeYtDlpCommand(), [
-  const { stdout } = await runCapture(ytDlpCommand, [
     '--get-url',
     '--no-warnings',
     '-f',

src/core/services/youtube/track-download.test.ts

@@ -114,6 +114,39 @@ async function withFakeYtDlp<T>(
   });
 }
 
+async function withFakeYtDlpCommand<T>(
+  mode: 'both' | 'webp-only' | 'multi' | 'multi-primary-only-fail' | 'rolling-auto',
+  fn: (dir: string, binDir: string) => Promise<T>,
+): Promise<T> {
+  return await withTempDir(async (root) => {
+    const binDir = path.join(root, 'bin');
+    fs.mkdirSync(binDir, { recursive: true });
+    makeFakeYtDlpScript(binDir);
+
+    const originalPath = process.env.PATH;
+    const originalCommand = process.env.SUBMINER_YTDLP_BIN;
+    process.env.PATH = '';
+    process.env.YTDLP_FAKE_MODE = mode;
+    process.env.SUBMINER_YTDLP_BIN =
+      process.platform === 'win32' ? path.join(binDir, 'yt-dlp.cmd') : path.join(binDir, 'yt-dlp');
+    try {
+      return await fn(root, binDir);
+    } finally {
+      if (originalPath === undefined) {
+        delete process.env.PATH;
+      } else {
+        process.env.PATH = originalPath;
+      }
+      delete process.env.YTDLP_FAKE_MODE;
+      if (originalCommand === undefined) {
+        delete process.env.SUBMINER_YTDLP_BIN;
+      } else {
+        process.env.SUBMINER_YTDLP_BIN = originalCommand;
+      }
+    }
+  });
+}
+
 async function withFakeYtDlpExpectations<T>(
   expectations: Partial<
     Record<'YTDLP_EXPECT_AUTO_SUBS' | 'YTDLP_EXPECT_MANUAL_SUBS' | 'YTDLP_EXPECT_SUB_LANG', string>
@@ -179,6 +212,29 @@ test('downloadYoutubeSubtitleTrack prefers subtitle files over later webp artifa
   });
 });
 
+test('downloadYoutubeSubtitleTrack honors SUBMINER_YTDLP_BIN when yt-dlp is not on PATH', async () => {
+  if (process.platform === 'win32') {
+    return;
+  }
+
+  await withFakeYtDlpCommand('both', async (root) => {
+    const result = await downloadYoutubeSubtitleTrack({
+      targetUrl: 'https://www.youtube.com/watch?v=abc123',
+      outputDir: path.join(root, 'out'),
+      track: {
+        id: 'auto:ja-orig',
+        language: 'ja',
+        sourceLanguage: 'ja-orig',
+        kind: 'auto',
+        label: 'Japanese (auto)',
+      },
+    });
+
+    assert.equal(path.extname(result.path), '.vtt');
+    assert.match(path.basename(result.path), /^auto-ja-orig\./);
+  });
+});
+
 test('downloadYoutubeSubtitleTrack ignores stale subtitle files from prior runs', async () => {
   if (process.platform === 'win32') {
     return;

src/core/services/youtube/track-download.ts

@@ -2,6 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { spawn } from 'node:child_process';
 import type { YoutubeTrackOption } from './track-probe';
+import { getYoutubeYtDlpCommand } from './ytdlp-command';
 import {
   convertYoutubeTimedTextToVtt,
   isYoutubeTimedTextExtension,
@@ -237,7 +238,7 @@ export async function downloadYoutubeSubtitleTrack(input: {
     }),
   ];
 
-  await runCapture('yt-dlp', args);
+  await runCapture(getYoutubeYtDlpCommand(), args);
   const subtitlePath = pickLatestSubtitleFile(input.outputDir, prefix);
   if (!subtitlePath) {
     throw new Error(`No subtitle file was downloaded for ${input.track.sourceLanguage}`);
@@ -281,7 +282,7 @@ export async function downloadYoutubeSubtitleTracks(input: {
   const includeManualSubs = input.tracks.some((track) => track.kind === 'manual');
 
   const result = await runCaptureDetailed(
-    'yt-dlp',
+    getYoutubeYtDlpCommand(),
     buildDownloadArgs({
       targetUrl: input.targetUrl,
       outputTemplate,

src/core/services/youtube/track-probe.test.ts

@@ -48,6 +48,37 @@ async function withFakeYtDlp<T>(
   });
 }
 
+async function withFakeYtDlpCommand<T>(
+  payload: unknown,
+  fn: () => Promise<T>,
+  options: { rawScript?: boolean } = {},
+): Promise<T> {
+  return await withTempDir(async (root) => {
+    const binDir = path.join(root, 'bin');
+    fs.mkdirSync(binDir, { recursive: true });
+    makeFakeYtDlpScript(binDir, payload, options.rawScript === true);
+    const originalPath = process.env.PATH;
+    const originalCommand = process.env.SUBMINER_YTDLP_BIN;
+    process.env.PATH = '';
+    process.env.SUBMINER_YTDLP_BIN =
+      process.platform === 'win32' ? path.join(binDir, 'yt-dlp.cmd') : path.join(binDir, 'yt-dlp');
+    try {
+      return await fn();
+    } finally {
+      if (originalPath === undefined) {
+        delete process.env.PATH;
+      } else {
+        process.env.PATH = originalPath;
+      }
+      if (originalCommand === undefined) {
+        delete process.env.SUBMINER_YTDLP_BIN;
+      } else {
+        process.env.SUBMINER_YTDLP_BIN = originalCommand;
+      }
+    }
+  });
+}
+
 test('probeYoutubeTracks prefers srv3 over vtt for automatic captions', async () => {
   await withFakeYtDlp(
     {
@@ -69,6 +100,28 @@ test('probeYoutubeTracks prefers srv3 over vtt for automatic captions', async ()
   );
 });
 
+test('probeYoutubeTracks honors SUBMINER_YTDLP_BIN when yt-dlp is not on PATH', async () => {
+  if (process.platform === 'win32') {
+    return;
+  }
+
+  await withFakeYtDlpCommand(
+    {
+      id: 'abc123',
+      title: 'Example',
+      subtitles: {
+        ja: [{ ext: 'vtt', url: 'https://example.com/ja.vtt', name: 'Japanese manual' }],
+      },
+    },
+    async () => {
+      const result = await probeYoutubeTracks('https://www.youtube.com/watch?v=abc123');
+      assert.equal(result.videoId, 'abc123');
+      assert.equal(result.tracks[0]?.downloadUrl, 'https://example.com/ja.vtt');
+      assert.equal(result.tracks[0]?.fileExtension, 'vtt');
+    },
+  );
+});
+
 test('probeYoutubeTracks keeps preferring srt for manual captions', async () => {
   await withFakeYtDlp(
     {

src/core/services/youtube/track-probe.ts

@@ -1,6 +1,7 @@
 import { spawn } from 'node:child_process';
 import type { YoutubeTrackOption } from '../../../types';
 import { formatYoutubeTrackLabel, normalizeYoutubeLangCode, type YoutubeTrackKind } from './labels';
+import { getYoutubeYtDlpCommand } from './ytdlp-command';
 
 const YOUTUBE_TRACK_PROBE_TIMEOUT_MS = 15_000;
 
@@ -111,7 +112,11 @@ function toTracks(entries: Record<string, YtDlpSubtitleEntry> | undefined, kind:
 export type { YoutubeTrackOption };
 
 export async function probeYoutubeTracks(targetUrl: string): Promise<YoutubeTrackProbeResult> {
-  const { stdout } = await runCapture('yt-dlp', ['--dump-single-json', '--no-warnings', targetUrl]);
+  const { stdout } = await runCapture(getYoutubeYtDlpCommand(), [
+    '--dump-single-json',
+    '--no-warnings',
+    targetUrl,
+  ]);
   const trimmedStdout = stdout.trim();
   if (!trimmedStdout) {
     throw new Error('yt-dlp returned empty output while probing subtitle tracks');

src/core/services/youtube/ytdlp-command.ts

@@ -0,0 +1,5 @@
+const DEFAULT_YTDLP_COMMAND = 'yt-dlp';
+
+export function getYoutubeYtDlpCommand(): string {
+  return process.env.SUBMINER_YTDLP_BIN?.trim() || DEFAULT_YTDLP_COMMAND;
+}