Add offline support to pub install and update.

sdk/lib/_internal/pub/lib/src/command_install.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.
 
 library command_install;
 
 import 'dart:async';
 
+import 'package:args/args.dart';
+
 import 'command.dart';
 import 'entrypoint.dart';
 import 'log.dart' as log;
 
 /// Handles the `install` pub command.
 class InstallCommand extends PubCommand {
   String get description => "Install the current package's dependencies.";
   String get usage => "pub install";
 
+  ArgParser get commandParser {
+    return new ArgParser()
+        ..addFlag('offline',
+            help: 'Use cached packages instead of accessing the network');

[nweiz, 2013/05/06 23:02:25]

Trailing period.

[Bob Nystrom, 2013/05/07 21:03:09]

We use periods for the command descriptions but not for the options. (I'm not
sure why we do that, but this is at least consistent with the other commands.)

[nweiz, 2013/05/07 21:14:49]

All the global options have periods. I think it's just the publish/uploader
options that don't; those should be fixed.

+  }
+
+  bool get isOffline => commandOptions['offline'];
+
   Future onRun() {
     return entrypoint.installDependencies()
         .then((_) => log.message("Dependencies installed!"));
   }
 }