Notepad.go

func NewNotepad(outThreshold Threshold, logThreshold Threshold, outHandle, logHandle io.Writer, prefix string, flags int) *Notepad {
	n := &Notepad{}

	n.loggers = [7]**log.Logger{&n.TRACE, &n.DEBUG, &n.INFO, &n.WARN, &n.ERROR, &n.CRITICAL, &n.FATAL}
	n.outHandle = outHandle
	n.logHandle = logHandle
	n.stdoutThreshold = outThreshold
	n.logThreshold = logThreshold

	if len(prefix) != 0 {
		n.prefix = "[" + prefix + "] "
	} else {
		n.prefix = ""
	}

	n.flags = flags

	n.LOG = log.New(n.logHandle,
		"LOG:   ",
		n.flags)
	n.FEEDBACK = &Feedback{out: log.New(outHandle, "", 0), log: n.LOG}

	n.init()
	return n
}

// init creates the loggers for each level depending on the notepad thresholds.
func (n *Notepad) init() {
	logAndOut := io.MultiWriter(n.outHandle, n.logHandle)

	for t, logger := range n.loggers {
		threshold := Threshold(t)
		counter := &logCounter{}
		n.logCounters[t] = counter
		prefix := n.prefix + threshold.String() + " "

		switch {
		case threshold >= n.logThreshold && threshold >= n.stdoutThreshold:
			*logger = log.New(io.MultiWriter(counter, logAndOut), prefix, n.flags)

		case threshold >= n.logThreshold:
			*logger = log.New(io.MultiWriter(counter, n.logHandle), prefix, n.flags)

		case threshold >= n.stdoutThreshold:
			*logger = log.New(io.MultiWriter(counter, n.outHandle), prefix, n.flags)

		default:
			// counter doesn't care about prefix and flags, so don't use them
			// for performance.
			*logger = log.New(counter, "", 0)
		}
	}
}