First stab at "pub run" command.

sdk/lib/_internal/pub/bin/pub.dart

 // Copyright (c) 2013, 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 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:http/http.dart' as http;
 import 'package:path/path.dart' as path;
@@ skipping 27 matching lines @@
   if (options['help']) {
     PubCommand.printGlobalUsage();
     return;
   }
 
   if (options['trace']) {
     log.recordTranscript();
   }
 
   switch (options['verbosity']) {
-    case 'normal': log.showNormal(); break;
-    case 'io':     log.showIO(); break;
-    case 'solver': log.showSolver(); break;
-    case 'all':    log.showAll(); break;
+    case 'normal': log.verbosity = log.Verbosity.NORMAL; break;
+    case 'io':     log.verbosity = log.Verbosity.IO; break;
+    case 'solver': log.verbosity = log.Verbosity.SOLVER; break;
+    case 'all':    log.verbosity = log.Verbosity.ALL; break;
     default:
       // No specific verbosity given, so check for the shortcut.
       if (options['verbose']) {
-        log.showAll();
-      } else {
-        log.showNormal();
+        log.verbosity = log.Verbosity.ALL;
       }
       break;
   }
 
   log.fine('Pub ${sdk.version}');
 
   var cacheDir;
   if (Platform.environment.containsKey('PUB_CACHE')) {
     cacheDir = Platform.environment['PUB_CACHE'];
   } else if (Platform.operatingSystem == 'windows') {
@@ skipping 140 matching lines @@
     if (Platform.operatingSystem != 'windows') return null;
 
     return runProcess('ver', []).then((result) {
       if (result.stdout.join('\n').contains('XP')) {
         log.error('Sorry, but pub is not supported on Windows XP.');
         return flushThenExit(exit_codes.USAGE);
       }
     });
   });
 }