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Add word-wise Ctrl+Arrow and Alt+Backspace support #79

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Add word-wise Ctrl+Arrow and Alt+Backspace support #79

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11 changes: 9 additions & 2 deletions terminal.go
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Original file line number Diff line number Diff line change
Expand Up @@ -326,6 +326,10 @@ func (t *terminal) consumeANSIEscape(buf *bufio.Reader, ansiBuf *bytes.Buffer) (
case 'b':
// Alt-b in xterm, or Option+LeftArrow in iTerm2 with "Natural text editing"
return readResult{r: MetaBackward, ok: true}, nil // Alt-b
case '\b', 0x7f:
// Alt-Backspace in many terminals is sent as ESC + Backspace or ESC + DEL.
// Treat this as word-wise backspace.
return readResult{r: MetaBackspace, ok: true}, nil
case '[', 'O':
// this is a real ANSI escape sequence, read the rest of the sequence below:
case '\x1b':
Expand Down Expand Up @@ -429,9 +433,12 @@ func consumeAltSequence(buf *bufio.Reader) (result readResult, err error) {
func altModifierEnabled(payload []byte) bool {
// https://www.xfree86.org/current/ctlseqs.html ; modifier keycodes
// go after the semicolon, e.g. Alt-LeftArrow is `\x1b[1;3D` in VTE
// terminals, where 3 indicates Alt
// terminals, where 3 indicates Alt. Use the same word-wise behavior for
// Ctrl-Left/Right (modifier 5) and Alt+Ctrl (modifier 7), since readline
// doesn't distinguish them at a higher level.
if semicolonIdx := bytes.IndexByte(payload, ';'); semicolonIdx != -1 {
if string(payload[semicolonIdx+1:]) == "3" {
switch string(payload[semicolonIdx+1:]) {
case "3", "5", "7":
return true
}
}
Expand Down