feat: auto-detect bundle ID from iOS/Android projects (#3)

Add a third prompt question that asks for the app bundle ID. The default
is auto-detected by scanning for Xcode projects (PRODUCT_BUNDLE_IDENTIFIER
in .pbxproj) or Android projects (applicationId/namespace in build.gradle).
iOS is preferred when both exist. If cwd is test/tests, the parent directory
is also searched.

The bundleId is written into mobilewright.config instead of test.use() in
the example test, since the fixture now reads it from config.

Author: gmegidish

src/index.ts

@@ -7,6 +7,59 @@ import { execSync } from "child_process";
 
 type Language = "ts" | "js";
 
+function getSearchDirs(cwd: string): string[] {
+  const dirs = [cwd];
+  const basename = path.basename(cwd).toLowerCase();
+  if (basename === "test" || basename === "tests") {
+    dirs.push(path.dirname(cwd));
+  }
+  return dirs;
+}
+
+function detectIosBundleId(dirs: string[]): string | undefined {
+  for (const dir of dirs) {
+    const entries = fs.readdirSync(dir);
+    for (const entry of entries) {
+      if (entry.endsWith(".xcodeproj")) {
+        const pbxprojPath = path.join(dir, entry, "project.pbxproj");
+        if (fs.existsSync(pbxprojPath)) {
+          const content = fs.readFileSync(pbxprojPath, "utf-8");
+          const match = content.match(/PRODUCT_BUNDLE_IDENTIFIER\s*=\s*"?([^";]+)"?\s*;/);
+          if (match) {
+            return match[1].trim();
+          }
+        }
+      }
+    }
+  }
+  return undefined;
+}
+
+function detectAndroidPackageName(dirs: string[]): string | undefined {
+  for (const dir of dirs) {
+    const appDir = path.join(dir, "app");
+    if (!fs.existsSync(appDir)) continue;
+
+    for (const filename of ["build.gradle.kts", "build.gradle"]) {
+      const gradlePath = path.join(appDir, filename);
+      if (!fs.existsSync(gradlePath)) continue;
+
+      const content = fs.readFileSync(gradlePath, "utf-8");
+      const appIdMatch = content.match(/applicationId\s*=?\s*"([^"]+)"/);
+      if (appIdMatch) return appIdMatch[1];
+
+      const namespaceMatch = content.match(/namespace\s*=?\s*"([^"]+)"/);
+      if (namespaceMatch) return namespaceMatch[1];
+    }
+  }
+  return undefined;
+}
+
+function detectBundleId(): string {
+  const dirs = getSearchDirs(process.cwd());
+  return detectIosBundleId(dirs) ?? detectAndroidPackageName(dirs) ?? "";
+}
+
 function createPackageJson(targetDir: string, language: Language): void {
   const pkgPath = path.join(targetDir, "package.json");
 
@@ -32,7 +85,7 @@ function createPackageJson(targetDir: string, language: Language): void {
   fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + "\n");
 }
 
-function createConfigFile(targetDir: string, testDir: string, language: Language): void {
+function createConfigFile(targetDir: string, testDir: string, language: Language, bundleId: string): void {
   const ext = language === "ts" ? "ts" : "js";
   const configPath = path.join(targetDir, `mobilewright.config.${ext}`);
 
@@ -44,9 +97,11 @@ function createConfigFile(targetDir: string, testDir: string, language: Language
     ? "export default defineConfig"
     : "module.exports = defineConfig";
 
+  const bundleIdLine = bundleId ? `\n  bundleId: '${bundleId}',` : "";
+
   const content = `${importLine}
 ${exportLine}({
-  testDir: './${testDir}',
+  testDir: './${testDir}',${bundleIdLine}
   reporter: 'html',
 });
 `;
@@ -64,8 +119,6 @@ function createTestFile(targetDir: string, testDir: string, language: Language):
 
   const content = `${importLine}
 
-test.use({ bundleId: "com.example.app" });
-
 test('app launches and shows home screen', async ({ screen }) => {
   await expect(screen.getByText('Welcome')).toBeVisible();
 });
@@ -92,6 +145,8 @@ async function main() {
     "Getting started with writing mobile automation and end-to-end tests"
   );
 
+  const detectedBundleId = detectBundleId();
+
   const response = await prompts(
     [
       {
@@ -110,6 +165,12 @@ async function main() {
         message: "Directory name for test files?",
         initial: "tests",
       },
+      {
+        type: "text",
+        name: "bundleId",
+        message: "What is the app bundle ID to test? (Leave empty to skip)",
+        initial: detectedBundleId,
+      },
     ],
     {
       onCancel: () => {
@@ -118,9 +179,10 @@ async function main() {
     }
   );
 
-  const { language, testDir } = response as {
+  const { language, testDir, bundleId } = response as {
     language: Language;
     testDir: string;
+    bundleId: string;
   };
 
   if (!language || !testDir) {
@@ -130,7 +192,7 @@ async function main() {
   const targetDir = process.cwd();
 
   createPackageJson(targetDir, language);
-  createConfigFile(targetDir, testDir, language);
+  createConfigFile(targetDir, testDir, language, bundleId);
   createTestFile(targetDir, testDir, language);
 
   runNpmInstall(targetDir);