Add support for hidden options to pkg/args.

pkg/args/lib/args.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.
 
 /**
  * Parser support for transforming raw command-line arguments into a set
  * of options and values.
  *
  * This library supports [GNU][] and [POSIX][] style options, and it works
  * in both server-side and client-side apps.
@@ skipping 316 matching lines @@
   }
 
   /**
    * Defines a value-taking option. Throws an [ArgumentError] if:
    *
    * * There is already an option with name [name].
    * * There is already an option using abbreviation [abbr].
    */
   void addOption(String name, {String abbr, String help, List<String> allowed,
       Map<String, String> allowedHelp, String defaultsTo,
-      void callback(value), bool allowMultiple: false}) {
+      void callback(value), bool allowMultiple: false,
+      bool isHidden: false}) {

[Bob Nystrom, 2013/09/24 20:57:07]

Let's do "hide" for the named parameter.

[nweiz, 2013/09/24 21:01:17]

Done.

     _addOption(name, abbr, help, allowed, allowedHelp, defaultsTo,
-        callback, isFlag: false, allowMultiple: allowMultiple);
+        callback, isFlag: false, allowMultiple: allowMultiple,
+        isHidden: isHidden);
   }
 
   void _addOption(String name, String abbr, String help, List<String> allowed,
       Map<String, String> allowedHelp, defaultsTo,
       void callback(value), {bool isFlag, bool negatable: false,
-      bool allowMultiple: false}) {
+      bool allowMultiple: false, bool isHidden: false}) {
     // Make sure the name isn't in use.
     if (_options.containsKey(name)) {
       throw new ArgumentError('Duplicate option "$name".');
     }
 
     // Make sure the abbreviation isn't too long or in use.
     if (abbr != null) {
       var existing = findByAbbreviation(abbr);
       if (existing != null) {
         throw new ArgumentError(
             'Abbreviation "$abbr" is already used by "${existing.name}".');
       }
     }
 
     _options[name] = new Option(name, abbr, help, allowed, allowedHelp,
         defaultsTo, callback, isFlag: isFlag, negatable: negatable,
-        allowMultiple: allowMultiple);
+        allowMultiple: allowMultiple, isHidden: isHidden);
   }
 
   /**
    * Parses [args], a list of command-line arguments, matches them against the
    * flags and options defined by this parser, and returns the result.
    *
    * If [allowTrailingOptions] is set, the parser will continue parsing even
    * after it finds an argument that is neither an option nor a command.
    * This allows options to be specified after regular arguments.
    *
@@ skipping 72 matching lines @@
           'Could not find an option named "$name".');
     }
 
     return _options[name];
   }
 
   /** Get the names of the options as an [Iterable]. */
   Iterable<String> get options => _options.keys;
 }