Logger clone helper

See cihub#94

cfg_config.go

@@ -27,6 +27,7 @@ package seelog
 import (
 	"bytes"
 	"encoding/xml"
+	"fmt"
 	"io"
 	"os"
 )
@@ -186,3 +187,26 @@ func LoggerFromCustomReceiver(receiver CustomReceiver) (LoggerInterface, error)
 
 	return createLoggerFromFullConfig(conf)
 }
+
+func CloneLogger(logger LoggerInterface) (LoggerInterface, error) {
+	switch logger := logger.(type) {
+	default:
+		return nil, fmt.Errorf("unexpected type %T", logger)
+	case *asyncAdaptiveLogger:
+		clone, err := NewAsyncAdaptiveLogger(logger.commonLogger.config, logger.minInterval, logger.maxInterval, logger.criticalMsgCount)
+		if err != nil {
+			return nil, err
+		}
+		return clone, nil
+	case *asyncLoopLogger:
+		return NewAsyncLoopLogger(logger.commonLogger.config), nil
+	case *asyncTimerLogger:
+		clone, err := NewAsyncTimerLogger(logger.commonLogger.config, logger.interval)
+		if err != nil {
+			return nil, err
+		}
+		return clone, nil
+	case *syncLogger:
+		return NewSyncLogger(logger.commonLogger.config), nil
+	}
+}