Start work on porting unicode input kitten to Go

tools/tui/loop/api.go

@@ -195,11 +195,11 @@ func (self *Loop) Println(args ...any) {
 	self.QueueWriteString("\r\n")
 }
 
-func (self *Loop) SaveCursor() {
+func (self *Loop) SaveCursorPosition() {
 	self.QueueWriteString("\x1b7")
 }
 
-func (self *Loop) RestoreCursor() {
+func (self *Loop) RestoreCursorPosition() {
 	self.QueueWriteString("\x1b8")
 }
 
@@ -341,6 +341,12 @@ func (self *Loop) AllowLineWrapping(allow bool) {
 	}
 }
 
+func (self *Loop) SetWindowTitle(title string) {
+	title = strings.ReplaceAll(title, "\033", "")
+	title = strings.ReplaceAll(title, "\x9c", "")
+	self.QueueWriteString("\033]2;" + title + "\033\\")
+}
+
 func (self *Loop) ClearScreen() {
 	self.QueueWriteString("\x1b[H\x1b[2J")
 }

tools/tui/readline/api.go

@@ -168,6 +168,10 @@ func New(loop *loop.Loop, r RlInit) *Readline {
 	return ans
 }
 
+func (self *Readline) SetPrompt(prompt string) {
+	self.prompt = self.make_prompt(prompt, false)
+}
+
 func (self *Readline) Shutdown() {
 	self.history.Shutdown()
 }

tools/tui/ui_kitten.go

@@ -0,0 +1,37 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package tui
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"kitty/tools/utils"
+)
+
+var _ = fmt.Print
+
+func KittenOutputSerializer() func(any) (string, error) {
+	write_with_escape_code := os.Getenv("KITTEN_RUNNING_AS_UI") != ""
+	os.Unsetenv("KITTEN_RUNNING_AS_UI")
+	if write_with_escape_code {
+		return func(what any) (string, error) {
+			data, err := json.Marshal(what)
+			if err != nil {
+				return "", err
+			}
+			return "\x1bP@kitty-kitten-result|" + utils.UnsafeBytesToString(data) + "\x1b\\", nil
+		}
+	}
+	return func(what any) (string, error) {
+		if sval, ok := what.(string); ok {
+			return sval, nil
+		}
+		data, err := json.MarshalIndent(what, "", "  ")
+		if err != nil {
+			return "", err
+		}
+		return utils.UnsafeBytesToString(data), nil
+	}
+}