New verbose flag for the dart command line analyzer

pkg/analyzer/lib/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 options;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
 
@@ skipping 33 matching lines @@
 
   /** The path to the dart SDK */
   final String dartSdkPath;
 
   /** The path to the package root */
   final String packageRootPath;
 
   /** The source files to analyze */
   final List<String> sourceFiles;
 
+  /** Whether to log additional analysis messages and exceptions */
+  final bool log;
+
   /**
    * Initialize options from the given parsed [args].
    */
   CommandLineOptions._fromArgs(ArgResults args)
     : shouldBatch = args['batch'],
       machineFormat = args['machine'] || args['format'] == 'machine',
       displayVersion = args['version'],
       disableHints = args['no-hints'],
       ignoreUnrecognizedFlags = args['ignore-unrecognized-flags'],
       perf = args['perf'],
       showPackageWarnings = args['show-package-warnings'] || args['package-warnings'],
       showSdkWarnings = args['show-sdk-warnings'] || args['warnings'],
       warningsAreFatal = args['fatal-warnings'],
       dartSdkPath = args['dart-sdk'],
       packageRootPath = args['package-root'],
+      log = args['log'],
       sourceFiles = args.rest;
 
   /**
    * Parse [args] into [CommandLineOptions] describing the specified
    * analyzer options. In case of a format error, prints error and exists.
    */
   static CommandLineOptions parse(List<String> args) {
     CommandLineOptions options = _parse(args);
     // check SDK
     {
@@ skipping 42 matching lines @@
           help: 'Show warnings from package: imports (deprecated)',
           defaultsTo: false, negatable: false)
       ..addFlag('perf',
           help: 'Show performance statistics',
           defaultsTo: false, negatable: false)
       ..addFlag('warnings', help: 'Show warnings from SDK imports',
           defaultsTo: false, negatable: false)
       ..addFlag('show-sdk-warnings', help: 'Show warnings from SDK imports (deprecated)',
           defaultsTo: false, negatable: false)
       ..addFlag('help', abbr: 'h', help: 'Display this help message',
-          defaultsTo: false, negatable: false);
+          defaultsTo: false, negatable: false)
+      ..addFlag('log', help: 'Log additional messages and exceptions',
+        defaultsTo: false, negatable: false, hide: true);
 
     try {
       // TODO(scheglov) https://code.google.com/p/dart/issues/detail?id=11061
       args = args.map((String arg) => arg == '-batch' ? '--batch' : arg).toList();
       var results = parser.parse(args);
       // help requests
       if (results['help']) {
         _showUsage(parser);
         exit(0);
       }
@@ skipping 57 matching lines @@
     : _knownFlags = <String>[],
       _parser = new ArgParser();
 
 
   /**
    * Defines a flag.
    *
    * See [ArgParser.addFlag()].
    */
   void addFlag(String name, {String abbr, String help, bool defaultsTo: false,
-      bool negatable: true, void callback(bool value)}) {
+      bool negatable: true, void callback(bool value), bool hide: false}) {
     _knownFlags.add(name);
     _parser.addFlag(name, abbr: abbr, help: help, defaultsTo: defaultsTo,
-        negatable: negatable, callback: callback);
+        negatable: negatable, callback: callback, hide: hide);
   }
 
   /**
    * Defines a value-taking option.
    *
    * See [ArgParser.addOption()].
    */
   void addOption(String name, {String abbr, String help, List<String> allowed,
       Map<String, String> allowedHelp, String defaultsTo,
       void callback(value), bool allowMultiple: false}) {
@@ skipping 52 matching lines @@
 
   _getNextFlagIndex(args, i) {
     for ( ; i < args.length; ++i) {
       if (args[i].startsWith('--')) {
         return i;
       }
     }
     return i;
   }
 }