#26 support unique edit line

operation.go

@@ -174,9 +174,15 @@ func (o *Operation) ioloop() {
 				o.ExitSearchMode(false)
 			}
 			o.buf.MoveToLineEnd()
+			var data []rune
+			if !o.cfg.UniqueEditLine {
 				o.buf.WriteRune('\n')
-			data := o.buf.Reset()
+				data = o.buf.Reset()
 				data = data[:len(data)-1] // trim \n
+			} else {
+				o.buf.Clean()
+				data = o.buf.Reset()
+			}
 			o.outchan <- data
 			o.NewHistory(data)
 		case CharBackward:

readline.go

@@ -44,6 +44,8 @@ type Config struct {
 
 	MaskRune rune
 
+	UniqueEditLine bool
+
 	// private fields
 	inited    bool
 	opHistory *opHistory