added Writers func

log.go

@@ -117,21 +117,33 @@ type Interface interface {
 // write to w.
 func Writer(w io.Writer, debug, info string) Interface {
 	return writerInterface{
-		debug: debug,
-		info:  info,
-		w:     w,
+		debug:  debug,
+		info:   info,
+		wDebug: w,
+		wInfo:  w,
+	}
+}
+
+// Writers returns an Interface with the given debug and info prefixes that
+// write to wDebug and wInfo respectively.
+func Writers(wDebug, wInfo io.Writer, debug, info string) Interface {
+	return writerInterface{
+		debug:  debug,
+		info:   info,
+		wDebug: wDebug,
+		wInfo:  wInfo,
 	}
 }
 
 type writerInterface struct {
-	debug, info string
-	w           io.Writer
+	debug, info   string
+	wDebug, wInfo io.Writer
 }
 
 func (w writerInterface) Print(v string) {
-	fmt.Fprint(w.w, w.info, v)
+	fmt.Fprint(w.wInfo, w.info, v)
 }
 
 func (w writerInterface) Debug(v string) {
-	fmt.Fprint(w.w, w.debug, v)
+	fmt.Fprint(w.wDebug, w.debug, v)
 }