text: #
  # Copyright (c) 2012 Testrepository Contributors
  # 
  # Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
  # license at the users choice. A copy of both licenses are available in the
  # project source as Apache-2.0 and BSD. You may not use this file except in
  # compliance with one of these two licences.
  # 
  # Unless required by applicable law or agreed to in writing, software
  # distributed under these licenses is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
  # license you chose for the specific language governing permissions and
  # limitations under that license.
  
  """An Argument that gets the name of an existing path."""
  
  import os.path
  
  from testrepository.arguments import AbstractArgument
  
  
  class ExistingPathArgument(AbstractArgument):
      """An argument that stores a string verbatim."""
  
      def _parse_one(self, arg):
          if arg == '--':
              raise ValueError('-- is not a valid argument')
          if not os.path.exists(arg):
              raise ValueError('No such path %r' % (arg,))
          return arg
  