Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/watcher/lib/src/file_watcher/native.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library watcher.file_watcher.native;
+
+import 'dart:async';
+import 'dart:io';
+
+import '../file_watcher.dart';
+import '../resubscribable.dart';
+import '../utils.dart';
+import '../watch_event.dart';
+
+/// Uses the native file system notifications to watch for filesystem events.
+///
+/// Single-file notifications are much simpler than those for multiple files, so
+/// this doesn't need to be split out into multiple OS-specific classes.
+class NativeFileWatcher extends ResubscribableWatcher implements FileWatcher {
+  NativeFileWatcher(String path)
+      : super(path, () => new _NativeFileWatcher(path));
+}
+
+class _NativeFileWatcher implements FileWatcher, ManuallyClosedWatcher {
+  final String path;
+
+  Stream<WatchEvent> get events => _eventsController.stream;
+  final _eventsController = new StreamController<WatchEvent>.broadcast();
+
+  bool get isReady => _readyCompleter.isCompleted;
+
+  Future get ready => _readyCompleter.future;
+  final _readyCompleter = new Completer();
+
+  StreamSubscription _subscription;
+
+  _NativeFileWatcher(this.path) {
+    _listen();
+
+    // We don't need to do any initial set-up, so we're ready immediately after
+    // being listened to.
+    _readyCompleter.complete();
+  }
+
+  void _listen() {
+    // Batch the events together so that we can dedup them.
+    _subscription = new File(path).watch()
+        .transform(new BatchedStreamTransformer<FileSystemEvent>())
+        .listen(_onBatch, onError: _eventsController.addError, onDone: _onDone);
+  }
+
+  void _onBatch(List<FileSystemEvent> batch) {
+    if (batch.any((event) => event.type == FileSystemEvent.DELETE)) {
+      // If the file is deleted, the underlying stream will close. We handle
+      // emitting our own REMOVE event in [_onDone].
+      return;
+    }
+
+    _eventsController.add(new WatchEvent(ChangeType.MODIFY, path));
+  }
+
+  _onDone() async {
+    var fileExists = await new File(path).exists();
+
+    // Check for this after checking whether the file exists because it's
+    // possible that [close] was called between [File.exists] being called and
+    // it completing.
+    if (_eventsController.isClosed) return;
+
+    if (fileExists) {
+      // If the file exists now, it was probably removed and quickly replaced;
+      // this can happen for example when another file is moved on top of it.
+      // Re-subscribe and report a modify event.
+      _eventsController.add(new WatchEvent(ChangeType.MODIFY, path));
+      _listen();
+    } else {
+      _eventsController.add(new WatchEvent(ChangeType.REMOVE, path));
+      close();
+    }
+  }
+
+  void close() {
+    if (_subscription != null) _subscription.cancel();
+    _subscription = null;
+    _eventsController.close();
+  }
+}