Handle keypad mode cursor key escape sequences.

terminal.go

@@ -125,6 +125,7 @@ func (t *Terminal) ioloop() {
 	var (
 		isEscape       bool
 		isEscapeEx     bool
+		isEscapeSS3    bool
 		expectNextChar bool
 	)
 
@@ -152,9 +153,15 @@ func (t *Terminal) ioloop() {
 		if isEscape {
 			isEscape = false
 			if r == CharEscapeEx {
+				// ^][
 				expectNextChar = true
 				isEscapeEx = true
 				continue
+			} else if r == CharO {
+				// ^]O
+				expectNextChar = true
+				isEscapeSS3 = true
+				continue
 			}
 			r = escapeKey(r, buf)
 		} else if isEscapeEx {
@@ -177,6 +184,15 @@ func (t *Terminal) ioloop() {
 				expectNextChar = true
 				continue
 			}
+		} else if isEscapeSS3 {
+			isEscapeSS3 = false
+			if key := readEscKey(r, buf); key != nil {
+				r = escapeSS3Key(key)
+			}
+			if r == 0 {
+				expectNextChar = true
+				continue
+			}
 		}
 
 		expectNextChar = true

utils.go

@@ -43,6 +43,7 @@ const (
 	CharCtrlY     = 25
 	CharCtrlZ     = 26
 	CharEsc       = 27
+	CharO         = 79
 	CharEscapeEx  = 91
 	CharBackspace = 127
 )
@@ -123,6 +124,27 @@ func escapeExKey(key *escapeKeyPair) rune {
 	return r
 }
 
+// translate EscOX SS3 codes for up/down/etc.
+func escapeSS3Key(key *escapeKeyPair) rune {
+	var r rune
+	switch key.typ {
+	case 'D':
+		r = CharBackward
+	case 'C':
+		r = CharForward
+	case 'A':
+		r = CharPrev
+	case 'B':
+		r = CharNext
+	case 'H':
+		r = CharLineStart
+	case 'F':
+		r = CharLineEnd
+	default:
+	}
+	return r
+}
+
 type escapeKeyPair struct {
 	attr string
 	typ  rune