More work on readline

tools/tui/loop/api.go

@@ -193,6 +193,40 @@ func (self *Loop) Beep() {
 	self.QueueWriteString("\a")
 }
 
+func (self *Loop) StartAtomicUpdate() {
+	self.QueueWriteString(PENDING_UPDATE.EscapeCodeToSet())
+}
+
+func (self *Loop) EndAtomicUpdate() {
+	self.QueueWriteString(PENDING_UPDATE.EscapeCodeToReset())
+}
+
+func (self *Loop) SetCursorShape(shape CursorShapes, blink bool) {
+	self.QueueWriteString(CursorShape(shape, blink))
+}
+
+func (self *Loop) MoveCursorHorizontally(amt int) {
+	suffix := "C"
+	if amt < 0 {
+		suffix = "D"
+		amt *= -1
+	}
+	self.QueueWriteString(fmt.Sprintf("\x1b[%d%s", amt, suffix))
+}
+
+func (self *Loop) MoveCursorVertically(amt int) {
+	suffix := "B"
+	if amt < 0 {
+		suffix = "A"
+		amt *= -1
+	}
+	self.QueueWriteString(fmt.Sprintf("\x1b[%d%s", amt, suffix))
+}
+
+func (self *Loop) ClearToEndOfScreen() {
+	self.QueueWriteString("\x1b[J")
+}
+
 func (self *Loop) Quit(exit_code int) {
 	self.exit_code = exit_code
 	self.keep_going = false

tools/tui/loop/terminal-state.go

@@ -21,6 +21,14 @@ const (
 	CLEAR_SCREEN                  = "\033[H\033[2J"
 )
 
+type CursorShapes uint
+
+const (
+	BLOCK_CURSOR     CursorShapes = 1
+	UNDERLINE_CURSOR CursorShapes = 3
+	BAR_CURSOR       CursorShapes = 5
+)
+
 type Mode uint32
 
 const private Mode = 1 << 31
@@ -147,3 +155,10 @@ func (self *TerminalStateOptions) ResetStateEscapeCodes() string {
 	sb.WriteString(RESTORE_COLORS)
 	return sb.String()
 }
+
+func CursorShape(shape CursorShapes, blink bool) string {
+	if !blink {
+		shape += 1
+	}
+	return fmt.Sprintf("\x1b[%d q", shape)
+}