log

var (
	WithCaller func() Logger

	Debugf func(format string, args ...interface{})
	Infof  func(format string, args ...interface{})
	Printf func(format string, args ...interface{})
	Errorf func(format string, args ...interface{})
	Fatalf func(format string, args ...interface{})

	Debug func(args ...interface{})
	Info  func(args ...interface{})
	Print func(args ...interface{})
	Error func(args ...interface{})
	Fatal func(args ...interface{})

	Debugln func(args ...interface{})
	Infoln  func(args ...interface{})
	Println func(args ...interface{})
	Errorln func(args ...interface{})
	Fatalln func(args ...interface{})
)