Add support for pub install.

utils/pub/command_list.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.
 
 /**
  * Handles the `list` pub command. This is mostly just used so we can pull
  * some basic data out of pub in the integration tests. Once pub is more
  * full-featured and has other commands that test everything it does, this
  * may go away.
  */
 class ListCommand extends PubCommand {
   String get description() => 'print the contents of repositories';
 
   void onRun() {
-    cache.listAll().then((packages) {
-      packages.sort((a, b) => a.name.compareTo(b.name));
-      for (final package in packages) {
-        print(package.name);
+    printIds(String title, List<PackageId> ids) {

[Bob Nystrom, 2012/05/03 00:15:49]

I would go ahead and make this a method. Part of the reason I made commands
classes instead of just functions is to enable that.

[nweiz, 2012/05/04 01:03:43]

Done.

+      ids = new List<PackageId>.from(ids);

[Bob Nystrom, 2012/05/03 00:15:49]

How about making PackageId implement Comparable?

[nweiz, 2012/05/04 01:03:43]

Done.

+      ids.sort((a, b) {
+        var sourceComp = a.source.name.compareTo(b.source.name);
+        if (sourceComp != 0) return sourceComp;
+        return a.name.compareTo(b.name);
+      });
+
+      print('From $title:');
+      for (var id in ids) {
+        print('  $id');
       }
-    });
+    }
+
+    // TODO(nweiz): also list the contents of the application cache when it's
+    // able to determine the source of its packages (that is, when we have a
+    // lockfile).
+    systemCache.listAll().then((ids) => printIds('system cache', ids));
   }
 }