Dart: Adds mojom pub package.

mojo/dart/mojom/bin/generate.dart

Index: mojo/dart/mojom/bin/generate.dart
diff --git a/mojo/dart/mojom/bin/generate.dart b/mojo/dart/mojom/bin/generate.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7804d561edfe6fc70b4af8276e40e69158b32e96
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+++ b/mojo/dart/mojom/bin/generate.dart
@@ -0,0 +1,111 @@
+// Copyright 2015 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.
+
+/*
+* This script should be invoked via 'pub run' for an application that consumes
+* pub packages containing generated Mojo bindings (.mojom.dart files).
+*
+* It should be invoked as follows after 'pub get':
+* $ pub run mojom:generate
+*/
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:args/args.dart' as args;
+import 'package:path/path.dart' as path;
+
+bool verbose;
+bool dryRun;
+
+bool isMojomDart(String path) => path.endsWith('.mojom.dart');
+
+// Copies .mojom.dart files from a particular package's mojom directory to
+// the mojom package directory.
+//
+// mojomDirectory: A pub packages mojom directory, i.e. $PACKAGE/mojom.
+// mojomPackage: The mojom package directory.
+copyMojomDirContents(Directory mojomDirectory, Directory mojomPackage) async {
+  assert(await mojomDirectory.exists());
+  await for (var mojoms in mojomDirectory.list(recursive: true)) {
+    if (mojoms is! File) continue;
+    if (!isMojomDart(mojoms.path)) continue;
+    if (verbose) print("Found $mojoms");
+
+    final relative = path.relative(mojoms.path, from: mojomDirectory.path);
+    final dest = path.join(mojomPackage.path, relative);
+    final destDirectory = new Directory(path.dirname(dest));
+
+    if (verbose || dryRun) {
+      print('Copying $mojoms to $dest');
+    }
+
+    if (!dryRun) {
+      final File source = new File(mojoms.path);
+      if (verbose) print("Ensuring $destDirectory exists");
+      await destDirectory.create(recursive: true);
+      source.copy(dest);
+    }
+  }
+}
+
+// If a package has a mojom directory, uses copyMojomDirContents to install them
+// in the mojom package.
+//
+// package: The directory of a pub package in an application's packages
+//          directory.
+// mojoPackage: The mojom package directory in an application's packages
+//              directory
+installPackageMojoms(Directory package, Directory mojomPackage) async {
+  if (package.path == mojomPackage.path) return;
+  if (verbose) print("package = $package");
+  final mojomDirectory = new Directory(path.join(package.path, 'mojom'));
+  if (verbose) print("looking for = $mojomDirectory");
+  if (await mojomDirectory.exists()) {
+    copyMojomDirContents(mojomDirectory, mojomPackage);
+  } else if (verbose) {
+    print("$mojomDirectory not found");
+  }
+}
+
+main(List<String> arguments) async {
+  final parser = new args.ArgParser()
+    ..addOption('package-root',
+        abbr: 'p',
+        defaultsTo: path.join(Directory.current.path, 'packages'),
+        help: 'An absolute path to an application\'s package root')
+    ..addFlag('dry-run',
+        abbr: 'd',
+        defaultsTo: false,
+        help: 'Print the copy operations that would have been run, but'
+        'do not copy anything.')
+    ..addFlag('verbose', abbr: 'v', defaultsTo: false);
+  final result = parser.parse(arguments);
+  verbose = result['verbose'];
+  dryRun = result['dry-run'];
+
+  final packages = new Directory(result['package-root']);
+  if (!packages.isAbsolute) {
+    print("The --package-root parameter should be an absolute path.");
+    exit(1);
+  }
+  if (verbose) print("packages = $packages");
+  if (!(await packages.exists())) {
+    print("The packages directory $packages does not exist");
+    exit(1);
+  }
+
+  final mojomPackage = new Directory(path.join(packages.path, 'mojom'));
+  if (verbose) print("mojom package = $mojomPackage");
+  if (!(await mojomPackage.exists())) {
+    print("The mojom package directory $mojomPackage does not exist");
+    exit(1);
+  }
+
+  await for (var package in packages.list()) {
+    if (package is Directory) {
+      installPackageMojoms(package, mojomPackage);
+    }
+  }
+}