# File lib/nanoc3/cli/logger.rb, line 49
    def file(level, action, identifier, duration=nil)
      log(
        level,
        '%s%12s%s  %s%s' % [
          color? ? ACTION_COLORS[action.to_sym] : '',
          action,
          color? ? "\e[0m" : '',
          duration.nil? ? '' : "[%2.2fs]  " % [ duration ],
          identifier
        ]
      )
    end