new_contents: from __future__ import unicode_literals, division, absolute_import
  import re
  from argparse import _VersionAction
  
  import flexget
  from flexget.utils import requests
  from flexget.plugin import register_parser_option
  
  
  class CheckVersion(_VersionAction):
      def __call__(self, parser, namespace, values, option_string=None):
          messages = []
          try:
              page = requests.get('http://download.flexget.com')
          except requests.RequestException:
              messages.append('Error getting latest version number from download.flexget.com')
          else:
              ver = re.search(r'FlexGet-([\d\.]*)\.tar\.gz', page.text).group(1)
              if flexget.__version__ == ver:
                  messages.append('You are on the latest version. (%s)' % ver)
              else:
                  messages.append('You are on: %s' % flexget.__version__)
                  messages.append('Latest release: %s' % ver)
          parser.exit(message='\n'.join(messages))
  
  register_parser_option('--check-version', action=CheckVersion, help='Check for latest version.')
subject: Add --check-version to see if you are on latest release.