pkg/docgen: add --indent-json option

pkg/docgen/bin/docgen.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:logging/logging.dart';
 import 'package:path/path.dart' as path;
 
@@ skipping 18 matching lines @@
   var scriptDir = path.dirname(Platform.script.toFilePath());
   var introduction = includeSdk ? '' : options['introduction'];
 
   var pubScript = options['sdk'] != null ?
       path.join(options['sdk'], 'bin', 'pub') : 'pub';
 
   var dartBinary = options['sdk'] != null ?
       path.join(options['sdk'], 'bin', 'dart') : 'dart';
 
   var excludedLibraries = options['exclude-lib'];
-  if(excludedLibraries == null) excludedLibraries = [];
+  if (excludedLibraries == null) excludedLibraries = [];
+
+  var indentJSON = options['indent-json'] as bool;
 
   docgen(files,
       packageRoot: options['package-root'],
       includePrivate: options['include-private'],
       includeSdk: includeSdk,
       parseSdk: options['parse-sdk'],
       introFileName: introduction,
       out: options['out'],
       excludeLibraries: excludedLibraries,
       includeDependentPackages: options['include-dependent-packages'],
       compile: options['compile'],
       serve: options['serve'],
       dartBinary: dartBinary,
       pubScript: pubScript,
       noDocs: options['no-docs'],
-      startPage: startPage);
+      startPage: startPage,
+      indentJSON: indentJSON);
 }
 
 /**
  * Print help if we are passed the help option or invalid arguments.
  */
 void _printHelpAndExit() {
   print(_initArgParser().getUsage());
   print('Usage: dart docgen.dart [OPTIONS] fooDir/barFile');
   exit(0);
 }
@@ skipping 71 matching lines @@
       defaultsTo: true, negatable: true);
   parser.addOption('sdk',
       help: 'SDK directory',
       defaultsTo: null);
   parser.addOption('start-page',
       help: 'By default the viewer will start at the SDK introduction page. '
         'To start at some other page, e.g. for a package, provide the name '
         'of the package in this argument, e.g. --start-page=intl will make '
         'the start page of the viewer be the intl package.',
         defaultsTo: null);
+  parser.addFlag('indent-json',
+      help: 'Indents each level of JSON output by two spaces',
+      defaultsTo: false, negatable: true);
 
   return parser;
 }