code: func (f *FileLogger) Print(v ...interface{}) {
  	_, file, line, _ := runtime.Caller(1) //calldepth=2
  	f.logChan <- fmt.Sprintf("[%v:%v]", shortFileName(file), line) + fmt.Sprint(v...)
  }
docs: // Print throw logstr to channel to print to the logger.
  // Arguments are handled in the manner of fmt.Print.