Google

# File log4r/formatter/formatter.rb, line 56
    def format(event)
      buff = sprintf(@@basicformat, LNAMES[event.level],
             event.name, MaxLevelLength)
      buff += (event.tracer.nil? ? "" : "(#{event.tracer[0]})") + ": "
      buff += format_object(event.data) + "\n"
      buff
    end