Roll Observatory packages and add a roll script

quiver/lib/io.dart

-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-library quiver.io;
-
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:quiver/async.dart';
-
-/**
- * Converts a [Stream] of byte lists to a [String].
- */
-Future<String> byteStreamToString(Stream<List<int>> stream,
-    {Encoding encoding: UTF8}) {
-  return stream.transform(encoding.decoder).join();
-}
-
-/**
- * Gets the full path of [path] by using [File.fullPathSync].
- */
-String getFullPath(path) => new File(path).resolveSymbolicLinksSync();
-
-/**
- * Lists the sub-directories and files of this Directory, optionally recursing
- * into sub-directories based on the return value of [visit].
- *
- * [visit] is called with a [File], [Directory] or [Link] to a directory,
- * never a Symlink to a File. If [visit] returns true, then it's argument is
- * listed recursively.
- */
-Future visitDirectory(Directory dir, Future<bool> visit(FileSystemEntity f)) {
-  var futureGroup = new FutureGroup();
-
-  void _list(Directory dir) {
-    var completer = new Completer();
-    futureGroup.add(completer.future);
-    dir.list(followLinks: false).listen((FileSystemEntity entity) {
-      var future = visit(entity);
-      if (future != null) {
-        futureGroup.add(future.then((bool recurse) {
-          // recurse on directories, but not cyclic symlinks
-          if (entity is! File && recurse == true) {
-            if (entity is Link) {
-              if (FileSystemEntity.typeSync(entity.path, followLinks: true) ==
-                  FileSystemEntityType.DIRECTORY) {
-                var fullPath = getFullPath(entity.path).toString();
-                var dirFullPath = getFullPath(dir.path).toString();
-                if (!dirFullPath.startsWith(fullPath)) {
-                  _list(new Directory(entity.path));
-                }
-              }
-            } else {
-              _list(entity);
-            }
-          }
-        }));
-      }
-    }, onDone: () {
-      completer.complete(null);
-    }, cancelOnError: true);
-  }
-  _list(dir);
-
-  return futureGroup.future;
-}