Allow suppressing message extraction warnings, providing a prefix for generated files, and format w…

pkg/intl/test/message_extraction/make_hardcoded_translation.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.
 
 /**
  * This simulates a translation process, reading the messages generated
  * from extract_message.dart for the files sample_with_messages.dart and
  * part_of_sample_with_messages.dart and writing out hard-coded translations for
  * German and French locales.
  */
 
 import 'dart:io';
 import 'dart:json' as json;
 import 'package:pathos/path.dart' as path;
-import 'find_output_directory.dart';
+import 'package:args/args.dart';
 
 /** A list of the French translations that we will produce. */
 var french = {
   "types" : r"$a, $b, $c",
   "multiLine" : "Cette message prend plusiers lignes.",
   "message2" : r"Un autre message avec un seul paramètre $x",
   "alwaysTranslated" : "Cette chaîne est toujours traduit",
   "message1" : "Il s'agit d'un message",
   "leadingQuotes" : "\"Soi-disant\"",
   "trickyInterpolation" : r"L'interpolation est délicate "
@@ skipping 61 matching lines @@
   file.writeAsStringSync(json.stringify(translated));
 }
 
 main() {
   var args = new Options().arguments;
   if (args.length == 0) {
     print('Usage: generate_hardcoded_translation [--output-dir=<dir>] '
         '[originalFile.dart]');
     exit(0);
   }
+  var parser = new ArgParser();
+  parser.addOption("output-dir", defaultsTo: '.',
+      callback: (value) => targetDir = value);
+  parser.parse(args);
 
-  targetDir = findOutputDirectory(args);
   var fileArgs = args.where((x) => x.contains('.json'));
 
   var messages = json.parse(new File(fileArgs.first).readAsStringSync());
   translate(messages, "fr", french);
   translate(messages, "de_DE", german);
 }