commit 0b3c0c4

editor: handle DEL key

 1@@ -228,6 +228,11 @@ func (app *App) handleUIEvent(ev tcell.Event) {
 2 			if ok && app.win.InputLen() == 0 {
 3 				app.s.TypingStop(app.win.CurrentBuffer())
 4 			}
 5+		case tcell.KeyDelete:
 6+			ok := app.win.InputDelete()
 7+			if ok && app.win.InputLen() == 0 {
 8+				app.s.TypingStop(app.win.CurrentBuffer())
 9+			}
10 		case tcell.KeyCR, tcell.KeyLF:
11 			buffer := app.win.CurrentBuffer()
12 			input := app.win.InputEnter()

 1@@ -71,19 +71,31 @@ func (e *editor) RemRune() (ok bool) {
 2 	if !ok {
 3 		return
 4 	}
 5+	e.remRuneAt(e.cursorIdx - 1)
 6+	e.Left()
 7+	return
 8+}
 9 
10+func (e *editor) RemRuneForward() (ok bool) {
11+	ok = e.cursorIdx < len(e.text)
12+	if !ok {
13+		return
14+	}
15+	e.remRuneAt(e.cursorIdx)
16+	return
17+}
18+
19+func (e *editor) remRuneAt(idx int) {
20 	// TODO avoid looping twice
21-	rw := e.textWidth[e.cursorIdx] - e.textWidth[e.cursorIdx-1]
22-	for i := e.cursorIdx; i < len(e.textWidth); i++ {
23+	rw := e.textWidth[idx+1] - e.textWidth[idx]
24+	for i := idx + 1; i < len(e.textWidth); i++ {
25 		e.textWidth[i] -= rw
26 	}
27-	copy(e.textWidth[e.cursorIdx:], e.textWidth[e.cursorIdx+1:])
28+	copy(e.textWidth[idx+1:], e.textWidth[idx+2:])
29 	e.textWidth = e.textWidth[:len(e.textWidth)-1]
30 
31-	copy(e.text[e.cursorIdx-1:], e.text[e.cursorIdx:])
32+	copy(e.text[idx:], e.text[idx+1:])
33 	e.text = e.text[:len(e.text)-1]
34-	e.Left()
35-	return
36 }
37 
38 func (e *editor) Flush() (content string) {

 1@@ -174,6 +174,14 @@ func (ui *UI) InputBackspace() (ok bool) {
 2 	return
 3 }
 4 
 5+func (ui *UI) InputDelete() (ok bool) {
 6+	ok = ui.e.RemRuneForward()
 7+	if ok {
 8+		ui.draw()
 9+	}
10+	return
11+}
12+
13 func (ui *UI) InputEnter() (content string) {
14 	content = ui.e.Flush()
15 	ui.draw()