Ship a build_and_copy command with the devtools_extensions package

packages/devtools_extensions/CHANGELOG.md

@@ -1,5 +1,7 @@
 ## 0.0.3-wip
 * Add a simulated DevTools environment that for easier development.
+* Add a `build_and_copy` command to build a devtools extension and copy the output to the
+parent package's extension/devtools directory.
 
 ## 0.0.2-dev.0
 

packages/devtools_extensions/README.md

@@ -106,9 +106,9 @@ to interact with DevTools. From anywhere your extension web app, you can access
 #### Utilize helper packages
 
 Use [package:devtools_app_shared](https://pub.dev/packages/devtools_app_shared) for access to
-service managers, common widgets, DevTools theming, utilities, and more.
-
-TODO(kenz): link examples.
+service managers, common widgets, DevTools theming, utilities, and more. See the
+[devtools_app_shared/example](https://github.com/flutter/devtools/tree/master/packages/devtools_app_shared/example)
+directory for sample usages of the different shared libraries from DevTools.
 
 ### Debug the extension web app
 
@@ -154,15 +154,23 @@ To use a real DevTools environment, you will need to perform a series of setup s
 real DevTools environment. Build your flutter web app and copy the built assets from
 `your_extension_web_app/build` to your pub package's `extension/devtools/build` directory.
 
-> Use the `build_helper.sh` script to help with this step. (TODO(kenz): create and add link to helper script).
+Use the `build_extension` command from `package:devtools_extensions` to help with this step.
+```
+dart pub global activate devtools_extensions;
+dart run devtools_extensions build_and_copy \
+  --source=path/to/your_extension_web_app \
+  --dest=path/to/your_pub_package/extension/devtools 
+```
 
 2. Prepare and run a test application that depends on your pub package. You'll need to change the
 `pubspec.yaml` dependency to be a `path` dependency that points to your local pub package
 source code. Once you have done this, run `pub get`, and run the application.
 
 3. Start DevTools:
     * **If you need local or unreleased changes from DevTools**, you'll need to build and run DevTools
-    from source. See `<TODO: insert instructions>` for a guide on how to do this.
+    from source. See the DevTools [CONTRIBUTING.md]() for a guide on how to do this.
+        > Note: you'll need to build DevTools with the server and the front end to test extensions - see
+        [instructions](https://github.com/flutter/devtools/blob/master/CONTRIBUTING.md#development-devtools-server--devtools-flutter-web-app).
     * **If not, and if your local Dart or Flutter SDK version is >= `<TODO: insert version>`**,
     you can launch the DevTools instance that was just started by running your app (either from
     a url printed to command line or from the IDE where you ran your test app). You can also run

packages/devtools_extensions/bin/_build_and_copy.dart

@@ -0,0 +1,139 @@
+// Copyright 2023 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:args/command_runner.dart';
+import 'package:io/io.dart';
+import 'package:path/path.dart' as path;
+
+/// Command that builds a DevTools extension and copies the built output to
+/// the parent package extension location.
+/// 
+/// Example usage:
+/// 
+/// dart pub global activate devtools_extensions;
+/// dart run devtools_extensions build_and_copy \
+///  --source=path/to/your_extension_web_app \
+///  --dest=path/to/your_pub_package/extension/devtools 
+class BuildExtensionCommand extends Command {
+  BuildExtensionCommand() {
+    argParser
+      ..addOption(
+        'source',
+        help: 'The source location for the extension flutter web app (can  be '
+            'relative or absolute)',
+        valueHelp: 'path/to/foo/packages/foo_devtools_extension',
+      )
+      ..addOption(
+        'dest',
+        help: 'The destination location for the extension build output (can be '
+            'relative or absolute)',
+        valueHelp: 'path/to/foo/packages/foo/extension/devtools',
+      );
+  }
+
+  static const _sourceKey = 'source';
+  static const _destinationKey = 'dest';
+
+  String get _logPrefix => '[$name]';
+
+  @override
+  final name = 'build_and_copy';
+
+  @override
+  final description =
+      'Command that builds a DevTools extension from source and copies the '
+      'built output to the parent package extension location.';
+
+  @override
+  Future<void> run() async {
+    final source = argResults?[_sourceKey];
+    final destination = argResults?[_destinationKey];
+    if (source == null) {
+      throw ArgumentError(
+        'Missing argument \'$_sourceKey\', which describes the source location '
+        'for the extension flutter web app',
+        _sourceKey,
+      );
+    }
+    if (destination == null) {
+      throw ArgumentError(
+        'Missing argument \'$_destinationKey\', which describes the source '
+        'location for the extension flutter web app',
+        _destinationKey,
+      );
+    }
+
+    final processManager = ProcessManager();
+
+    _log('building the extension flutter web app...');
+    final buildProcess = await processManager.spawn(
+      'flutter',
+      [
+        'build',
+        'web',
+        '--web-renderer',
+        'canvaskit',
+        '--pwa-strategy=offline-first',
+        '--release',
+        '--no-tree-shake-icons',
+      ],
+      workingDirectory: source,
+    );
+    await buildProcess.exitCode;
+
+    _log('setting canvaskit permissions...');
+    final chmodProcess = await processManager.spawn(
+      'chmod',
+      ['0755', 'build/web/canvaskit/canvaskit.*'],
+      workingDirectory: source,
+    );
+    await chmodProcess.exitCode;
+
+    _log('copying built output to the extension destination...');
+    await _copyBuildToDestination(source: source, dest: destination);
+
+    // Closes stdin for the entire program.
+    await sharedStdIn.terminate();
+  }
+
+  Future<void> _copyBuildToDestination({
+    required String source,
+    required String dest,
+  }) async {
+    _log('copying the extension config.json file into a temp directory...');
+    final tmp = Directory.current.createTempSync();
+    final tmpConfigPath = path.join(tmp.path, 'config.json');
+    final destinationConfigPath = path.join(dest, 'config.json');
+    File(destinationConfigPath)..copySync(tmpConfigPath);
+
+    _log('replacing the existing extension build with the new one...');
+    final sourceBuildPath = path.join(source, 'build', 'web');
+    final destinationBuildPath = path.join(dest, 'build');
+    Directory(destinationBuildPath)..deleteSync(recursive: true);
+    Directory(destinationBuildPath)..createSync(recursive: true);
+    await copyPath(
+      sourceBuildPath,
+      destinationBuildPath,
+    );
+
+    _log(
+      'copying the extension config.json file back to the destination '
+      'directory...',
+    );
+    File(tmpConfigPath)..copySync(destinationConfigPath);
+    tmp.deleteSync(recursive: true);
+
+    _log(
+      'Successfully copied extension assets from '
+      '"${Directory(source).resolveSymbolicLinksSync()}" to'
+      '"${Directory(dest).resolveSymbolicLinksSync()}"',
+    );
+  }
+
+  void _log(String message) {
+    print('$_logPrefix $message');
+  }
+}

packages/devtools_extensions/bin/devtools_extensions.dart

@@ -0,0 +1,13 @@
+// Copyright 2023 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:args/command_runner.dart';
+import '_build_and_copy.dart';
+
+void main(List<String> arguments) async {
+  final command = BuildExtensionCommand();
+  final runner = CommandRunner('devtools_extensions', command.description)
+    ..addCommand(BuildExtensionCommand());
+  await runner.run(arguments);
+}

packages/devtools_extensions/pubspec.yaml

@@ -8,10 +8,13 @@ environment:
   flutter: '>=3.0.0'
 
 dependencies:
+  args: ^2.4.2
   devtools_shared: ^3.0.0
   devtools_app_shared: ^0.0.1-dev.0
   flutter:
     sdk: flutter
+  io: ^1.0.4
+  path: ^1.8.0
   logging: ^1.1.1
   vm_service: ">=10.1.0 <12.0.0"