frog: life is better with colors :)

frog/utils.dart

 // Copyright (c) 2011, 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.
 
 // Collection<T> supports most of the ES 5 Array methods, but it's missing
 // map and reduce.
 
 // TODO(jmesserly): we might want a version of this that return an iterable,
 // however JS, Python and Ruby versions are all eager.
 List map(Iterable source, mapper(source)) {
@@ skipping 124 matching lines @@
   final int length;
   int _index = 0;
   FixedIterator(this.value, this.length);
 
   bool hasNext() => _index < length;
   E next() {
     _index++;
     return value;
   }
 }
+
+// Color constants used for generating messages.
+String _GREEN_COLOR = '\u001b[32m';
+String _RED_COLOR = '\u001b[31m';
+String _MAGENTA_COLOR = '\u001b[35m';
+String _NO_COLOR = '\u001b[0m';