Roll Observatory packages and add a roll script

dart_style/lib/src/io.dart

-// Copyright (c) 2014, 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 dart_style.src.io;
-
-import 'dart:io';
-
-import 'package:path/path.dart' as p;
-
-import 'dart_formatter.dart';
-import 'formatter_exception.dart';
-import 'formatter_options.dart';
-import 'source_code.dart';
-
-/// Runs the formatter on every .dart file in [path] (and its subdirectories),
-/// and replaces them with their formatted output.
-///
-/// Returns `true` if successful or `false` if an error occurred in any of the
-/// files.
-bool processDirectory(FormatterOptions options, Directory directory) {
-  options.reporter.showDirectory(directory.path);
-
-  var success = true;
-  for (var entry in directory.listSync(
-      recursive: true, followLinks: options.followLinks)) {
-    var relative = p.relative(entry.path, from: directory.path);
-
-    if (entry is Link) {
-      options.reporter.showSkippedLink(relative);
-      continue;
-    }
-
-    if (entry is! File || !entry.path.endsWith(".dart")) continue;
-
-    // If the path is in a subdirectory starting with ".", ignore it.
-    if (p.split(relative).any((part) => part.startsWith("."))) {
-      options.reporter.showHiddenFile(relative);
-      continue;
-    }
-
-    if (!processFile(options, entry, label: relative)) success = false;
-  }
-
-  return success;
-}
-
-/// Runs the formatter on [file].
-///
-/// Returns `true` if successful or `false` if an error occurred.
-bool processFile(FormatterOptions options, File file, {String label}) {
-  if (label == null) label = file.path;
-
-  var formatter = new DartFormatter(pageWidth: options.pageWidth);
-  try {
-    var source = new SourceCode(file.readAsStringSync(), uri: file.path);
-    var output = formatter.formatSource(source);
-    options.reporter
-        .showFile(file, label, output, changed: source.text != output.text);
-    return true;
-  } on FormatterException catch (err) {
-    var color = Platform.operatingSystem != "windows" &&
-        stdioType(stderr) == StdioType.TERMINAL;
-
-    stderr.writeln(err.message(color: color));
-  } catch (err, stack) {
-    stderr.writeln('''Hit a bug in the formatter when formatting $label.
-Please report at: github.com/dart-lang/dart_style/issues
-$err
-$stack''');
-  }
-
-  return false;
-}