Address CodeRabbit follow-ups for PR 40

CHANGELOG.md

@@ -6,6 +6,8 @@
 - AniList: Stopped post-watch tracking from sending a second progress update when the current episode was already satisfied by a ready retry item in the same watch-completion pass.
 - Playback: Fixed managed local playback so duplicate startup-ready retries no longer unpause media after a later manual pause on the same file.
 - Playback: Fixed managed local subtitle auto-selection so local files reuse configured primary/secondary subtitle language priorities instead of staying on mpv's initial `sid=auto` guess.
+- Launcher: Hardened `--launch-mpv` parsing and Windows binary resolution so valueless flags do not swallow media targets and symlinked launcher installs do not short-circuit PATH lookup.
+- Playback: Prevented stale async playlist-browser subtitle rearm callbacks from overriding newer subtitle selections during rapid file changes.
 
 ## v0.10.0 (2026-03-29)
 

launcher/mpv.test.ts

@@ -460,6 +460,18 @@ function withAccessSyncStub(
   }
 }
 
+function withRealpathSyncStub(resolvePath: (filePath: string) => string, run: () => void): void {
+  const originalRealpathSync = fs.realpathSync;
+  try {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    (fs as any).realpathSync = (filePath: string): string => resolvePath(filePath);
+    run();
+  } finally {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    (fs as any).realpathSync = originalRealpathSync;
+  }
+}
+
 test('findAppBinary resolves ~/.local/bin/SubMiner.AppImage when it exists', { concurrency: false }, () => {
   const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-test-home-'));
   const originalHomedir = os.homedir;
@@ -527,6 +539,44 @@ test('findAppBinary finds subminer on PATH when AppImage candidates do not exist
   }
 });
 
+test('findAppBinary excludes PATH matches that canonicalize to the launcher path', { concurrency: false }, () => {
+  const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-test-realpath-'));
+  const originalHomedir = os.homedir;
+  const originalPath = process.env.PATH;
+  try {
+    os.homedir = () => baseDir;
+    const binDir = path.join(baseDir, 'bin');
+    const wrapperPath = path.join(binDir, 'subminer');
+    const canonicalPath = path.join(baseDir, 'launch', 'subminer');
+    makeExecutable(wrapperPath);
+    process.env.PATH = `${binDir}${path.delimiter}${originalPath ?? ''}`;
+
+    withFindAppBinaryPlatformSandbox('linux', (pathModule) => {
+      withAccessSyncStub(
+        (filePath) => filePath === wrapperPath,
+        () => {
+          withRealpathSyncStub(
+            (filePath) => {
+              if (filePath === canonicalPath || filePath === wrapperPath) {
+                return canonicalPath;
+              }
+              return filePath;
+            },
+            () => {
+              const result = findAppBinary(canonicalPath, pathModule);
+              assert.equal(result, null);
+            },
+          );
+        },
+      );
+    });
+  } finally {
+    os.homedir = originalHomedir;
+    process.env.PATH = originalPath;
+    fs.rmSync(baseDir, { recursive: true, force: true });
+  }
+});
+
 test('findAppBinary resolves Windows install paths when present', { concurrency: false }, () => {
   const baseDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-test-win-'));
   const originalHomedir = os.homedir;

launcher/mpv.ts

@@ -18,6 +18,7 @@ import {
   uniqueNormalizedLangCodes,
   sleep,
   normalizeLangCode,
+  realpathMaybe,
 } from './util.js';
 
 export const state = {
@@ -380,8 +381,8 @@ export function findAppBinary(selfPath: string, pathModule: PathModule = path):
   );
 
   if (fromPath) {
-    const resolvedSelf = pathModule.resolve(selfPath);
-    const resolvedCandidate = pathModule.resolve(fromPath);
+    const resolvedSelf = realpathMaybe(selfPath);
+    const resolvedCandidate = realpathMaybe(fromPath);
     if (resolvedSelf !== resolvedCandidate) return fromPath;
   }
 

src/main-entry-runtime.test.ts

@@ -113,6 +113,15 @@ test('launch-mpv entry helpers detect and normalize targets', () => {
     ]),
     ['--input-ipc-server', '\\\\.\\pipe\\custom-subminer-socket', '--alang', 'ja,jpn'],
   );
+  assert.deepEqual(
+    normalizeLaunchMpvExtraArgs([
+      'SubMiner.exe',
+      '--launch-mpv',
+      '--fullscreen',
+      'C:\\a.mkv',
+    ]),
+    ['--fullscreen'],
+  );
   assert.deepEqual(
     normalizeLaunchMpvTargets([
       'SubMiner.exe',
@@ -126,6 +135,20 @@ test('launch-mpv entry helpers detect and normalize targets', () => {
     ]),
     ['C:\\a.mkv', 'C:\\b.mkv'],
   );
+  assert.deepEqual(
+    normalizeLaunchMpvTargets(['SubMiner.exe', '--launch-mpv', '--fullscreen', 'C:\\a.mkv']),
+    ['C:\\a.mkv'],
+  );
+  assert.deepEqual(
+    normalizeLaunchMpvExtraArgs([
+      'SubMiner.exe',
+      '--launch-mpv',
+      '--msg-level',
+      'all=warn',
+      'C:\\a.mkv',
+    ]),
+    ['--msg-level', 'all=warn'],
+  );
 });
 
 test('stats-daemon entry helper detects internal daemon commands', () => {

src/main-entry-runtime.ts

@@ -8,6 +8,23 @@ const START_ARG = '--start';
 const PASSWORD_STORE_ARG = '--password-store';
 const BACKGROUND_CHILD_ENV = 'SUBMINER_BACKGROUND_CHILD';
 const APP_NAME = 'SubMiner';
+const MPV_LONG_OPTIONS_WITH_SEPARATE_VALUES = new Set([
+  '--alang',
+  '--audio-file',
+  '--input-ipc-server',
+  '--log-file',
+  '--msg-level',
+  '--profile',
+  '--script',
+  '--script-opts',
+  '--scripts',
+  '--slang',
+  '--sub-file',
+  '--sub-file-paths',
+  '--title',
+  '--volume',
+  '--ytdl-format',
+]);
 
 type EarlyAppLike = {
   setName: (name: string) => void;
@@ -53,6 +70,15 @@ function removePassiveStartupArgs(argv: string[]): string[] {
   return filtered;
 }
 
+function consumesLaunchMpvValue(token: string): boolean {
+  return (
+    token.startsWith('--') &&
+    token !== '--' &&
+    !token.includes('=') &&
+    MPV_LONG_OPTIONS_WITH_SEPARATE_VALUES.has(token)
+  );
+}
+
 function parseCliArgs(argv: string[]): CliArgs {
   return parseArgs(argv);
 }
@@ -144,7 +170,7 @@ export function normalizeLaunchMpvTargets(argv: string[]): string[] {
     }
 
     if (token.startsWith('--')) {
-      if (!token.includes('=') && i + 1 < argv.length) {
+      if (consumesLaunchMpvValue(token) && i + 1 < argv.length) {
         const value = argv[i + 1];
         if (value && !value.startsWith('-')) {
           i += 1;
@@ -179,7 +205,7 @@ export function normalizeLaunchMpvExtraArgs(argv: string[]): string[] {
     }
     if (token.startsWith('--')) {
       extraArgs.push(token);
-      if (!token.includes('=') && i + 1 < argv.length) {
+      if (consumesLaunchMpvValue(token) && i + 1 < argv.length) {
         const value = argv[i + 1];
         if (value && !value.startsWith('-')) {
           extraArgs.push(value);

src/main/runtime/playlist-browser-runtime.test.ts

@@ -125,6 +125,17 @@ function createFakeMpvClient(options: {
   };
 }
 
+function createDeferred<T>(): {
+  promise: Promise<T>;
+  resolve: (value: T) => void;
+} {
+  let resolve!: (value: T) => void;
+  const promise = new Promise<T>((settle) => {
+    resolve = settle;
+  });
+  return { promise, resolve };
+}
+
 test('getPlaylistBrowserSnapshotRuntime lists sibling videos in best-effort episode order', async (t) => {
   const dir = createTempVideoDir(t);
   const episode2 = path.join(dir, 'Show - S01E02.mkv');
@@ -488,6 +499,73 @@ test('playPlaylistBrowserIndexRuntime ignores superseded local subtitle rearm ca
   );
 });
 
+test('playPlaylistBrowserIndexRuntime aborts stale async subtitle rearm work', async (t) => {
+  const dir = createTempVideoDir(t);
+  const episode1 = path.join(dir, 'Show - S01E01.mkv');
+  const episode2 = path.join(dir, 'Show - S01E02.mkv');
+  fs.writeFileSync(episode1, '');
+  fs.writeFileSync(episode2, '');
+
+  const firstTrackList = createDeferred<unknown>();
+  const secondTrackList = createDeferred<unknown>();
+  let trackListRequestCount = 0;
+  const mpvClient = createFakeMpvClient({
+    currentVideoPath: episode1,
+    playlist: [
+      { filename: episode1, current: true, title: 'Episode 1' },
+      { filename: episode2, title: 'Episode 2' },
+    ],
+  });
+  const requestProperty = mpvClient.requestProperty.bind(mpvClient);
+  mpvClient.requestProperty = async (name: string): Promise<unknown> => {
+    if (name === 'track-list') {
+      trackListRequestCount += 1;
+      return trackListRequestCount === 1 ? firstTrackList.promise : secondTrackList.promise;
+    }
+    return requestProperty(name);
+  };
+
+  const scheduled: Array<() => void> = [];
+  const deps = {
+    getMpvClient: () => mpvClient,
+    schedule: (callback: () => void) => {
+      scheduled.push(callback);
+    },
+  };
+
+  const firstPlay = await playPlaylistBrowserIndexRuntime(deps, 1);
+  assert.equal(firstPlay.ok, true);
+  scheduled[0]?.();
+
+  const secondPlay = await playPlaylistBrowserIndexRuntime(deps, 1);
+  assert.equal(secondPlay.ok, true);
+  scheduled[1]?.();
+
+  secondTrackList.resolve([
+    { type: 'sub', id: 21, lang: 'ja', title: 'Japanese', external: false, selected: true },
+    { type: 'sub', id: 22, lang: 'en', title: 'English', external: false },
+  ]);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+
+  firstTrackList.resolve([
+    { type: 'sub', id: 11, lang: 'ja', title: 'Japanese', external: false, selected: true },
+    { type: 'sub', id: 12, lang: 'en', title: 'English', external: false },
+  ]);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+
+  const subtitleCommands = mpvClient
+    .getCommands()
+    .filter(
+      (command) =>
+        command[0] === 'set_property' && (command[1] === 'sid' || command[1] === 'secondary-sid'),
+    );
+
+  assert.deepEqual(subtitleCommands, [
+    ['set_property', 'sid', 21],
+    ['set_property', 'secondary-sid', 22],
+  ]);
+});
+
 test('playlist-browser playback reapplies configured preferred subtitle tracks when track metadata is available', async (t) => {
   const dir = createTempVideoDir(t);
   const episode1 = path.join(dir, 'Show - S01E01.mkv');

src/main/runtime/playlist-browser-runtime.ts

@@ -235,8 +235,18 @@ async function buildMutationResult(
 async function rearmLocalSubtitleSelection(
   client: MpvPlaylistBrowserClientLike,
   deps: PlaylistBrowserRuntimeDeps,
+  expectedPath: string,
+  token: number,
 ): Promise<void> {
   const trackList = await readProperty(client, 'track-list');
+  if (pendingLocalSubtitleSelectionRearms.get(client) !== token) {
+    return;
+  }
+  const currentPath = trimToNull(client.currentVideoPath);
+  if (currentPath && path.resolve(currentPath) !== expectedPath) {
+    return;
+  }
+  pendingLocalSubtitleSelectionRearms.delete(client);
   const selection = resolveManagedLocalSubtitleSelection({
     trackList: Array.isArray(trackList) ? trackList : null,
     primaryLanguages: deps.getPrimarySubtitleLanguages?.() ?? [],
@@ -267,12 +277,7 @@ function scheduleLocalSubtitleSelectionRearm(
   pendingLocalSubtitleSelectionRearms.set(client, nextToken);
   (deps.schedule ?? setTimeout)(() => {
     if (pendingLocalSubtitleSelectionRearms.get(client) !== nextToken) return;
-    pendingLocalSubtitleSelectionRearms.delete(client);
-    const currentPath = trimToNull(client.currentVideoPath);
-    if (currentPath && path.resolve(currentPath) !== expectedPath) {
-      return;
-    }
-    void rearmLocalSubtitleSelection(client, deps);
+    void rearmLocalSubtitleSelection(client, deps, expectedPath, nextToken);
   }, 400);
 }