Function Log

internal/debug/debug.go:164–207

Log prints a message to the debug log (if debug is enabled).

(f string, args ...interface{})

// Log prints a message to the debug log (if debug is enabled).
func Log(f string, args ...interface{}) {
	if !opts.isEnabled {
		return
	}

	fn, dir, file, line := getPosition()
	goroutine := goroutineNum()

	if len(f) == 0 || f[len(f)-1] != '\n' {
		f += "\n"
	}

	type Shortener interface {
		Str() string
	}

	for i, item := range args {
		if shortener, ok := item.(Shortener); ok {
			args[i] = shortener.Str()
		}
	}

	pos := fmt.Sprintf("%s/%s:%d", dir, file, line)

	formatString := fmt.Sprintf("%s\t%s\t%d\t%s", pos, fn, goroutine, f)

	dbgprint := func() {
		fmt.Fprintf(os.Stderr, formatString, args...)
	}

	if opts.logger != nil {
		opts.logger.Printf(formatString, args...)
	}

	filename := fmt.Sprintf("%s/%s:%d", dir, file, line)
	if checkFilter(opts.files, filename) {
		dbgprint()
		return
	}

	if checkFilter(opts.funcs, fn) {
		dbgprint()
	}
}