[history] fix bug that check equals with previous command (#49)

history.go

@@ -66,11 +66,16 @@ func (o *opHistory) historyUpdatePath(path string) {
 	r := bufio.NewReader(o.fd)
 	total := 0
 	for ; ; total++ {
-		line, err := r.ReadSlice('\n')
+		line, err := r.ReadString('\n')
 		if err != nil {
 			break
 		}
-		o.Push([]rune(strings.TrimSpace(string(line))))
+		// ignore the empty line
+		line = strings.TrimSpace(line)
+		if len(line) == 0 {
+			continue
+		}
+		o.Push([]rune(line))
 		o.Compact()
 	}
 	if total > o.cfg.HistoryLimit {
@@ -214,20 +219,21 @@ func (o *opHistory) debug() {
 // save history
 func (o *opHistory) New(current []rune) (err error) {
 	current = runes.Copy(current)
+
 	// if just use last command without modify
 	// just clean lastest history
 	if back := o.history.Back(); back != nil {
 		prev := back.Prev()
 		if prev != nil {
-			use := o.showItem(o.current.Value.(*hisItem))
-			if runes.Equal(use, prev.Value.(*hisItem).Source) {
+			if runes.Equal(current, prev.Value.(*hisItem).Source) {
 				o.current = o.history.Back()
 				o.current.Value.(*hisItem).Clean()
 				o.historyVer++
 				return nil
 			}
 		}
 	}
+
 	if len(current) == 0 {
 		o.current = o.history.Back()
 		if o.current != nil {