Slog with AddSource: true is not working correctly due to wrapper in watermill

[ganeshdipdumbare]

Description
The slog logger is having an option to turn on source with AddSource: true handler option. This will show the caller with line no in the log.
Due to wrapper around slog in the watermill, it always shows the following line for debug and same for other log levels -

"source":{"function":"github.com/ThreeDotsLabs/watermill.(*SlogLoggerAdapter).Info","file":"/go/pkg/mod/github.com/!three!dots!labs/watermill@v1.3.5/slog.go","line":33

As per my finding the issue is slog is getting the caller at the following line no -
https://cs.opensource.google/go/go/+/refs/tags/go1.21.3:src/log/slog/logger.go;l=217

I have done quick fix while creating slog logger handler by adding following code

handlerOption := &slog.HandlerOptions{
		Level:     slogLevel,
		AddSource: true,
		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
			if a.Key == "source" && isForWatermill {
				const callerDepth = 8
				pc := make([]uintptr, 1)
				runtime.Callers(callerDepth, pc)
				fs := runtime.CallersFrames([]uintptr{pc[0]})
				f, _ := fs.Next()
				return slog.Attr{
					Key:   "@caller",
					Value: slog.StringValue(fmt.Sprintf("function:%s %s:%d", f.Function, f.File, f.Line)),
				}
			}
			return a
		},
	}