log := genericr.New(func(e genericr.Entry) {
	fmt.Fprintln(os.Stderr, e.String())
})
log.WithName("some-component").WithValues("x", 123).V(1).Info("some event", "y", 42)

type Entry struct {
	Level     int           // level at which this was logged
	Name      string        // name parts joined with '.'
	NameParts []string      // individual name segments
	Message   string        // message as send to log call
	Error     error         // error if .Error() was called
	Fields    []interface{} // alternating key-value pairs
	// Caller information
	Caller      runtime.Frame // only available after .WithCaller(true)
	CallerDepth int           // caller depth from callback
}

func TestLogger_Table(t *testing.T) {
	var last genericr.Entry
	log := genericr.New(func(e genericr.Entry) {
		last = e
		t.Log(e.String())
	})
    // ...
}

root := logrus.New()
root.SetLevel(logrus.TraceLevel)
root.SetFormatter(&logrus.TextFormatter{
	DisableColors:    true,
	DisableTimestamp: true,
})
root.Out = os.Stdout
var lf genericr.LogFunc = func(e genericr.Entry) {
	var l *logrus.Entry = root.WithField("component", e.Name)
	if e.Error != nil {
		l = l.WithError(e.Error)
	}
	if len(e.Fields) != 0 {
		l = l.WithFields(e.FieldsMap())
	}
	logrusLevel := logrus.Level(e.Level) + logrus.InfoLevel // 0 = info
	if logrusLevel < logrus.ErrorLevel {
		logrusLevel = logrus.ErrorLevel
	} else if logrusLevel > logrus.TraceLevel {
		logrusLevel = logrus.TraceLevel
	}
	l.Log(logrusLevel, e.Message)
}
log := genericr.New(lf)