fix: chinese corsor error chzyer#179

runebuf.go

@@ -35,7 +35,7 @@ type RuneBuffer struct {
 	sync.Mutex
 }
 
-func (r* RuneBuffer) pushKill(text []rune) {
+func (r *RuneBuffer) pushKill(text []rune) {
 	r.lastKill = append([]rune{}, text...)
 }
 
@@ -221,7 +221,7 @@ func (r *RuneBuffer) DeleteWord() {
 	}
 	for i := init + 1; i < len(r.buf); i++ {
 		if !IsWordBreak(r.buf[i]) && IsWordBreak(r.buf[i-1]) {
-			r.pushKill(r.buf[r.idx:i-1])
+			r.pushKill(r.buf[r.idx : i-1])
 			r.Refresh(func() {
 				r.buf = append(r.buf[:r.idx], r.buf[i-1:]...)
 			})
@@ -350,7 +350,7 @@ func (r *RuneBuffer) Yank() {
 		return
 	}
 	r.Refresh(func() {
-		buf := make([]rune, 0, len(r.buf) + len(r.lastKill))
+		buf := make([]rune, 0, len(r.buf)+len(r.lastKill))
 		buf = append(buf, r.buf[:r.idx]...)
 		buf = append(buf, r.lastKill...)
 		buf = append(buf, r.buf[r.idx:]...)
@@ -527,8 +527,11 @@ func (r *RuneBuffer) getBackspaceSequence() []byte {
 	}
 	var buf []byte
 	for i := len(r.buf); i > r.idx; i-- {
-		// move input to the left of one
-		buf = append(buf, '\b')
+		// fix: chinese corsor error #179(@SilentTTxo) https://github.com/chzyer/readline/pull/179
+		// move input to the left of one, fix character where width > 1, such like chinese
+		for j := 0; j < runes.Width(r.buf[i-1]); j++ {
+			buf = append(buf, '\b')
+		}
 		if sep[i] {
 			// up one line, go to the start of the line and move cursor right to the end (r.width)
 			buf = append(buf, "\033[A\r"+"\033["+strconv.Itoa(r.width)+"C"...)