fix slog WithAttrs

logger_go1.21.go

@@ -49,7 +49,7 @@ func (h *slogHandler) Handle(_ context.Context, r slog.Record) error {
 }
 
 func (h *slogHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
-	e := NewContext(nil)
+	e := NewContext(h.Logger.Context)
 	for _, attr := range attrs {
 		e = e.Any(attr.Key, attr.Value)
 	}

logger_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	stdLog "log"
+	"log/slog"
 	"net"
 	"os"
 	"strings"
@@ -540,6 +541,24 @@ func TestStdLogger(t *testing.T) {
 	stdLog.Printf("hello from stdLog %s", "Printf")
 }
 
+func TestSlog(t *testing.T) {
+	var logger *slog.Logger = (&Logger{
+		Level:      InfoLevel,
+		TimeField:  "date",
+		TimeFormat: "2006-01-02",
+		Caller:     1,
+	}).Slog()
+
+	sublogger := logger.With("logger", "a_test_slog").With("everything", 42)
+	sublogger.Info("hello from sub slog Info")
+	sublogger.Warn("hello from sub slog Warn")
+	sublogger.Error("hello from sub slog Error")
+
+	logger.Info("hello from slog Info")
+	logger.Warn("hello from slog Warn")
+	logger.Error("hello from slog Error")
+}
+
 type errno uint
 
 func (e errno) Error() string {