Fix an issue with the setupDevWorkspace target on windows.

tools/create_editor.py

 #!/usr/bin/env python
 #
 # 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.
 #
 # A script which will be invoked from gyp to create a build of the editor.
 # 
 # TODO(devoncarew): currently this script is not callable from tools/build.py
 # Usage: ./tools/build.py editor
@@ skipping 67 matching lines @@
 
 def GetSdkPath():
   return join(os.path.dirname(OUTPUT), 'dart-sdk')
 
 
 def GetOutputParent():
   return os.path.dirname(os.path.dirname(OUTPUT))
 
 
 def BuildOptions():
-  options = optparse.OptionParser()
+  options = optparse.OptionParser(usage='usage: %prog [options] <output>')
   options.add_option("-m", "--mode",
       help='Build variant',
       metavar='[debug,release]')
   options.add_option("-a", "--arch",
       help='Target architecture',
       metavar='[ia32,x64]')
   return options
 
   
 def Main():
   global OUTPUT
   
   parser = BuildOptions()
   (options, args) = parser.parse_args()
   
   if len(args) > 1:
-    print 'usage: tools/create_editor.py [options] <output>'
     parser.print_help()
-    return 0
+    return 1
   
   osName = utils.GuessOS()
   mode = 'debug'
   arch = utils.GuessArchitecture()
   
   if args:
     # TODO(devoncarew): Currently we scrape the output path to determine the
     # mode and arch. This is fragile and should moved into one location
     # (utils.py?) or made more explicit.
     OUTPUT = args[0]
@@ skipping 68 matching lines @@
     ProcessEditorArchive(archives[0], OUTPUT)
 
   if os.path.exists(GetEditorTemp()):
     shutil.rmtree(GetEditorTemp())
 
   print('\nEditor build successful')
 
 
 if __name__ == '__main__':
   sys.exit(Main())