Hack to accept, but not use, colors option

dart/pkg/dartdoc/bin/dartdoc.dart

 // Copyright (c) 2012, 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.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 61 matching lines @@
       case '--verbose':
         dartdoc.verbose = true;
         break;
       case '--include-api':
         dartdoc.includeApi = true;
         break;
       case '--link-api':
         dartdoc.linkToApi = true;
         break;
 
+      // Hack to accept, but not use, colors option.
+      // This allows shared bash script to run dartdoc.
+      case '--enable-diagnostic-colors':
+        break;
+
       default:
         if (arg.startsWith('--out=')) {
           dartdoc.outputDir =
               new Path.fromNative(arg.substring('--out='.length));
         } else if (arg.startsWith('--include-lib=')) {
           dartdoc.includedLibraries =
               arg.substring('--include-lib='.length).split(',');
         } else if (arg.startsWith('--exclude-lib=')) {
           dartdoc.excludedLibraries =
               arg.substring('--exclude-lib='.length).split(',');
@@ skipping 78 matching lines @@
                              names.
 
  --exclude-lib=<libs>        Use this option to explicitly specify which
                              libraries to exclude from the documentation. If
                              omitted, no libraries are excluded. <libs> is
                              comma-separated list of library names.
 
  --verbose                   Print verbose information during generation.
 ''');
 }