Hide aliases when printing 'pub --help'.

utils/pub/pub.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.
 
 /**
  * The main entrypoint for the pub command line application.
  */
 library pub;
 
 import '../../pkg/args/lib/args.dart';
@@ skipping 116 matching lines @@
   print(pubArgParser.getUsage());
   print('');
 
   // Show the commands sorted.
   print('Available commands:');
 
   // TODO(rnystrom): A sorted map would be nice.
   int length = 0;
   var names = <String>[];
   for (var command in pubCommands.keys) {
+    // Hide aliases.
+    if (pubCommands[command].aliases.indexOf(command) >= 0) continue;
     length = max(length, command.length);
     names.add(command);
   }
 
   names.sort((a, b) => a.compareTo(b));
 
   for (var name in names) {
     print('  ${padRight(name, length)}   ${pubCommands[name].description}');
   }
 
@@ skipping 137 matching lines @@
     if (exception is HttpException || exception is HttpParserException ||
         exception is SocketIOException || exception is PubHttpException) {
       return exit_codes.UNAVAILABLE;
     } else if (exception is FormatException) {
       return exit_codes.DATA;
     } else {
       return 1;
     }
   }
 }