Make "pub update PACKAGE" update a specific package.

utils/pub/command_update.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_update');
 
 #import('entrypoint.dart');
 #import('pub.dart');
 
 /** Handles the `update` pub command. */
 class UpdateCommand extends PubCommand {
   String get description() =>
     "update the current package's dependencies to the latest versions";
 
-  String get usage() => 'pub update';
+  String get usage() => 'pub update [dependencies...]';
 
   Future onRun() {
-    return entrypoint.updateDependencies().transform((_) {
-      print("Dependencies updated!");
-    });
+    var future;
+    if (commandOptions.rest.isEmpty) {

[Bob Nystrom, 2012/07/23 20:44:07]

isEmpty()  <sigh>

+      future = entrypoint.updateAllDependencies();
+    } else {
+      future = entrypoint.updateDependencies(commandOptions.rest);
+    }
+    return future.transform((_) => print("Dependencies updated!"));
   }
 }