Fix to NOT traverse linked directories when formatting (dartbug.com/13187).

pkg/analyzer_experimental/bin/formatter.dart

 #!/usr/bin/env dart
 
 // Copyright (c) 2013, 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.
 
 import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:path/path.dart' as path;
 
 import 'package:analyzer_experimental/src/services/formatter_impl.dart';
 
 
 const BINARY_NAME = 'dartfmt';
 final dartFileRegExp = new RegExp(r'^[^.].*\.dart$', caseSensitive: false);
 final argParser = _initArgParser();
 
 bool overwriteFileContents;
+const followLinks = false;
 
 main() {
   var options = argParser.parse(new Options().arguments);
   if (options['help']) {
     _printUsage();
     return;
   }
   overwriteFileContents = options['write'];
 
   if (options.rest.isEmpty) {
@@ skipping 14 matching lines @@
 }
 
 _formatResource(resource) {
   if (resource is Directory) {
     _formatDirectory(resource);
   } else if (resource is File) {
     _formatFile(resource);
   }
 }
 
-_formatDirectory(dir) =>
-    dir.listSync().forEach((resource) => _formatResource(resource));
+_formatDirectory(dir) => dir.listSync(followLinks: followLinks)
+    .forEach((resource) => _formatResource(resource));
 
 _formatFile(file) {
   if (_isDartFile(file)) {
     try {
       var buffer = new StringBuffer();
       var rawSource = file.readAsStringSync();
       var formatted = _formatCU(rawSource);
       if (overwriteFileContents) {
         file.writeAsStringSync(formatted);
       } else {
@@ skipping 48 matching lines @@
 
 /// Format the given [src] as a compilation unit.
 String _formatCU(src, {options: const FormatterOptions()}) =>
     new CodeFormatter(options).format(CodeKind.COMPILATION_UNIT, src);
 
 /// Log the given [msg].
 _log(String msg) {
   //TODO(pquitslund): add proper log support
   print(msg);
 }