feat: add auto update support

src/core/services/yomitan-extension-copy.ts

@@ -9,6 +9,13 @@ const YOMITAN_SYNC_SCRIPT_PATHS = [
   path.join('js', 'display', 'display-audio.js'),
 ];
 
+type ExtensionCopyResult = {
+  targetDir: string;
+  copied: boolean;
+};
+
+const asyncExtensionCopyInFlight = new Map<string, Promise<ExtensionCopyResult>>();
+
 function readManifestVersion(manifestPath: string): string | null {
   try {
     const parsed = JSON.parse(fs.readFileSync(manifestPath, 'utf-8')) as { version?: unknown };
@@ -18,6 +25,15 @@ function readManifestVersion(manifestPath: string): string | null {
   }
 }
 
+async function pathExists(filePath: string): Promise<boolean> {
+  try {
+    await fs.promises.access(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 export function hashDirectoryContents(dirPath: string): string | null {
   try {
     if (!fs.existsSync(dirPath) || !fs.statSync(dirPath).isDirectory()) {
@@ -53,6 +69,42 @@ export function hashDirectoryContents(dirPath: string): string | null {
   }
 }
 
+export async function hashDirectoryContentsAsync(dirPath: string): Promise<string | null> {
+  try {
+    const dirStat = await fs.promises.stat(dirPath);
+    if (!dirStat.isDirectory()) {
+      return null;
+    }
+
+    const hash = createHash('sha256');
+    const queue = [''];
+    while (queue.length > 0) {
+      const relativeDir = queue.shift()!;
+      const absoluteDir = path.join(dirPath, relativeDir);
+      const entries = await fs.promises.readdir(absoluteDir, { withFileTypes: true });
+      entries.sort((a, b) => a.name.localeCompare(b.name));
+
+      for (const entry of entries) {
+        const relativePath = path.join(relativeDir, entry.name);
+        const normalizedRelativePath = relativePath.split(path.sep).join('/');
+        hash.update(normalizedRelativePath);
+        if (entry.isDirectory()) {
+          queue.push(relativePath);
+          continue;
+        }
+        if (!entry.isFile()) {
+          continue;
+        }
+        hash.update(await fs.promises.readFile(path.join(dirPath, relativePath)));
+      }
+    }
+
+    return hash.digest('hex');
+  } catch {
+    return null;
+  }
+}
+
 function areFilesEqual(sourcePath: string, targetPath: string): boolean {
   if (!fs.existsSync(sourcePath) || !fs.existsSync(targetPath)) return false;
   try {
@@ -93,10 +145,7 @@ export function shouldCopyYomitanExtension(sourceDir: string, targetDir: string)
 export function ensureExtensionCopy(
   sourceDir: string,
   userDataPath: string,
-): {
-  targetDir: string;
-  copied: boolean;
-} {
+): ExtensionCopyResult {
   if (process.platform === 'win32') {
     return { targetDir: sourceDir, copied: false };
   }
@@ -117,3 +166,53 @@ export function ensureExtensionCopy(
 
   return { targetDir, copied: shouldCopy };
 }
+
+export async function ensureExtensionCopyAsync(
+  sourceDir: string,
+  userDataPath: string,
+): Promise<ExtensionCopyResult> {
+  if (process.platform === 'win32') {
+    return { targetDir: sourceDir, copied: false };
+  }
+
+  const extensionsRoot = path.join(userDataPath, 'extensions');
+  const targetDir = path.join(extensionsRoot, 'yomitan');
+  const inFlightKey = path.resolve(targetDir);
+  const inFlight = asyncExtensionCopyInFlight.get(inFlightKey);
+  if (inFlight) {
+    return await inFlight;
+  }
+
+  const copyPromise = ensureExtensionCopyAsyncInternal(sourceDir, extensionsRoot, targetDir);
+  asyncExtensionCopyInFlight.set(inFlightKey, copyPromise);
+  try {
+    return await copyPromise;
+  } finally {
+    if (asyncExtensionCopyInFlight.get(inFlightKey) === copyPromise) {
+      asyncExtensionCopyInFlight.delete(inFlightKey);
+    }
+  }
+}
+
+async function ensureExtensionCopyAsyncInternal(
+  sourceDir: string,
+  extensionsRoot: string,
+  targetDir: string,
+): Promise<ExtensionCopyResult> {
+  let shouldCopy = !(await pathExists(targetDir));
+  if (!shouldCopy) {
+    const [sourceHash, targetHash] = await Promise.all([
+      hashDirectoryContentsAsync(sourceDir),
+      hashDirectoryContentsAsync(targetDir),
+    ]);
+    shouldCopy = sourceHash !== targetHash;
+  }
+
+  if (shouldCopy) {
+    await fs.promises.mkdir(extensionsRoot, { recursive: true });
+    await fs.promises.rm(targetDir, { recursive: true, force: true });
+    await fs.promises.cp(sourceDir, targetDir, { recursive: true });
+  }
+
+  return { targetDir, copied: shouldCopy };
+}