code: def default_settings(params):
      
      def _default_settings(fn, command):
          for k, w in params.items():
              settings.setdefault(k, w)
          return fn(command)
      return decorator(_default_settings)
docs: Adds default values to settings if it not presented.
  
      Usage:
  
          @default_settings({'apt': '/usr/bin/apt'})
          def match(command):
              print(settings.apt)