code: def detect_log_config(arguments):
      
      config = arguments['--config']
      if config is None:
          config = detect_config_path()
      if not os.path.exists(config):
          error_exit('Nginx config file not found: %s' % config)
  
      with open(config) as f:
          config_str = f.read()
      access_logs = dict(get_access_logs(config_str))
      if not access_logs:
          error_exit('Access log file is not provided and ngxtop cannot detect it from your config file (%s).' % config)
  
      log_formats = dict(get_log_formats(config_str))
      if len(access_logs) == 1:
          log_path, format_name = list(access_logs.items())[0]
          if format_name == 'combined':
              return log_path, LOG_FORMAT_COMBINED
          if format_name not in log_formats:
              error_exit('Incorrect format name set in config for access log file "%s"' % log_path)
          return log_path, log_formats[format_name]
  
      # multiple access logs configured, offer to select one
      print('Multiple access logs detected in configuration:')
      log_path = choose_one(list(access_logs.keys()), 'Select access log file to process: ')
      format_name = access_logs[log_path]
      if format_name not in log_formats:
          error_exit('Incorrect format name set in config for access log file "%s"' % log_path)
      return log_path, log_formats[format_name]
docs: Detect access log config (path and format) of nginx. Offer user to select if multiple access logs are detected.
      :return: path and format of detected / selected access log