void _startParentWatcher()

in lib/src/directory_watcher/windows.dart [124:154]

• 21 lines of code
• 7 McCabe index (conditional complexity)

  void _startParentWatcher() {
    var absoluteDir = p.absolute(path);
    var parent = p.dirname(absoluteDir);
    // Check if [path] is already the root directory.
    if (FileSystemEntity.identicalSync(parent, path)) return;
    var parentStream = Directory(parent).watch(recursive: false);
    _parentWatchSubscription = parentStream.listen((event) {
      // Only look at events for 'directory'.
      if (p.basename(event.path) != p.basename(absoluteDir)) return;
      // Test if the directory is removed. FileSystemEntity.typeSync will
      // return NOT_FOUND if it's unable to decide upon the type, including
      // access denied issues, which may happen when the directory is deleted.
      // FileSystemMoveEvent and FileSystemDeleteEvent events will always mean
      // the directory is now gone.
      if (event is FileSystemMoveEvent ||
          event is FileSystemDeleteEvent ||
          (FileSystemEntity.typeSync(path) == FileSystemEntityType.notFound)) {
        for (var path in _files.paths) {
          _emitEvent(ChangeType.REMOVE, path);
        }
        _files.clear();
        close();
      }
    }, onError: (error) {
      // Ignore errors, simply close the stream. The user listens on
      // [directory], and while it can fail to listen on the parent, we may
      // still be able to listen on the path requested.
      _parentWatchSubscription?.cancel();
      _parentWatchSubscription = null;
    });
  }