Refactor Source and SourceRegistry.

lib/src/command/cache_repair.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 
 import '../command.dart';
 import '../exit_codes.dart' as exit_codes;
 import '../io.dart';
 import '../log.dart' as log;
 import '../source/cached.dart';
 import '../utils.dart';
 
 /// Handles the `cache repair` pub command.
 class CacheRepairCommand extends PubCommand {
   String get name => "repair";
   String get description => "Reinstall cached packages.";
   String get invocation => "pub cache repair";
   String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-cache.html";
   bool get takesArguments => false;
 
   Future run() async {
     var successes = [];
     var failures = [];
 
     // Repair every cached source.
-    for (var source in cache.sources) {
+    for (var source in cache.sources.all
+       .map((source) => cache.source(source.name))) {
       if (source is! CachedSource) continue;
 
       var results = await source.repairCachedPackages();
       successes.addAll(results.first);
       failures.addAll(results.last);
     }
 
     if (successes.length > 0) {
       var packages = pluralize("package", successes.length);
       log.message("Reinstalled ${log.green(successes.length)} $packages.");
@@ skipping 30 matching lines @@
 
     if (successes.length == 0 && failures.length == 0) {
       log.message("No packages in cache, so nothing to repair.");
     }
 
     if (failures.length > 0 || results.last.length > 0) {
       await flushThenExit(exit_codes.UNAVAILABLE);
     }
   }
 }