Outputing comma-separated report with percentages

tools/testing/dart/test_options.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.
 
 library test_options_parser;
 
 import "dart:io";
 import "drt_updater.dart";
 import "test_suite.dart";
 import "path.dart";
@@ skipping 204 matching lines @@
               false,
               type: 'bool'),
           new _TestOptionSpecification(
               'list',
               'List tests only, do not run them',
               ['--list'],
               [],
               false,
               type: 'bool'),
           new _TestOptionSpecification(
+              'jsonOnly',

[ricow1, 2015/01/13 08:03:01]

we don't store these using camel case, and to be specific, I would call this:
--report-in-json

[kevmoo, 2015/01/13 19:27:35]

Done.

+              'When doing list, output result summary in json only.',
+              ['--json-only'],
+              [],
+              false,
+              type: 'bool'),
+          new _TestOptionSpecification(
               'time',
               'Print timing information after running tests',
               ['--time'],
               [],
               false,
               type: 'bool'),
           new _TestOptionSpecification(
               'dart',
               'Path to dart executable',
               ['--dart'],
@@ skipping 439 matching lines @@
    */
   List<Map> _expandConfigurations(Map configuration) {
     // Expand the pseudo-values such as 'all'.
     if (configuration['arch'] == 'all') {
       configuration['arch'] = 'ia32,x64,simarm,simarm64,simmips';
     }
     if (configuration['mode'] == 'all') {
       configuration['mode'] = 'debug,release';
     }
 
+    if (configuration['jsonOnly']) {
+      configuration['list'] = true;
+      configuration['report'] = true;
+    }
+
     // Use verbose progress indication for verbose output unless buildbot
     // progress indication is requested.
     if (configuration['verbose'] && configuration['progress'] != 'buildbot') {
       configuration['progress'] = 'verbose';
     }
 
     // Create the artificial negative options that test status files
     // expect.
     configuration['unchecked'] = !configuration['checked'];
     configuration['host_unchecked'] = !configuration['host_checked'];
@@ skipping 184 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }