code: def _show_list_message(resolved_config):
      
      # Show what's available.
      supported_programs = util.get_list_of_all_supported_commands(
          resolved_config
      )
      msg_line_1 = 'Legend: '
      msg_line_2 = (
          '    ' +
          util.FLAG_ONLY_CUSTOM +
          ' only custom files'
      )
      msg_line_3 = (
          '    ' +
          util.FLAG_CUSTOM_AND_DEFAULT +
          ' custom and default files'
      )
      msg_line_4 = '    ' + '  only default files (no symbol)'
      msg_line_5 = ''
      msg_line_6 = 'Programs supported by eg: '
  
      preamble = [
          msg_line_1,
          msg_line_2,
          msg_line_3,
          msg_line_4,
          msg_line_5,
          msg_line_6
      ]
  
      complete_message = '\n'.join(preamble)
      complete_message += '\n' + '\n'.join(supported_programs)
  
      pydoc.pager(complete_message)
docs: Show the message for when a user has passed in --list.