docs: def main():
      """Main loop."""
      parser = optparse.OptionParser()
      parser.add_option(
          '-s', '--server', help='Index Server Name', metavar='SERVER')
      parser.add_option(
          '-r', '--repository', help='Repository URL', metavar='URL')
      parser.add_option(
          '-u', '--username', help='User Name', metavar='USERNAME')
      parser.add_option(
          '-p', '--password', help='Password', metavar='PASSWORD')
  
      options, _ = parser.parse_args()
  
      myrc = pypirc.PyPiRC()
      if options.server:
          if myrc.servers:
              # we're updating
              server = myrc.servers.get(options.server, {})
          else:
              server = {}
  
          if options.repository:
              server['repository'] = options.repository
  
          if options.username:
              server['username'] = options.username
  
          if options.password:
              server['password'] = options.password
  
          myrc.servers[options.server] = server
          myrc.save()
  
      if myrc.servers:
          pprint.pprint(myrc.servers)
      else:
          print '.pypirc Empty!'