Improve performance when pasting large amounts of text into readline by not redrawing on every char

tools/tui/loop/api.go

@@ -61,6 +61,7 @@ type Loop struct {
 	OnKeyEvent func(event *KeyEvent) error
 
 	// Called when text is received either from a key event or directly from the terminal
+	// Called with an empty string when bracketed paste ends
 	OnText func(text string, from_key_event bool, in_bracketed_paste bool) error
 
 	// Called when the terminal is resized

tools/tui/loop/run.go

@@ -31,6 +31,7 @@ func new_loop() *Loop {
 	l.escape_code_parser.HandleSOS = l.handle_sos
 	l.escape_code_parser.HandlePM = l.handle_pm
 	l.escape_code_parser.HandleRune = l.handle_rune
+	l.escape_code_parser.HandleEndOfBracketedPaste = l.handle_end_of_bracketed_paste
 	return &l
 }
 
@@ -128,6 +129,12 @@ func (self *Loop) handle_rune(raw rune) error {
 	return nil
 }
 
+func (self *Loop) handle_end_of_bracketed_paste() {
+	if self.OnText != nil {
+		self.OnText("", false, false)
+	}
+}
+
 func (self *Loop) on_signal(s unix.Signal) error {
 	switch s {
 	case unix.SIGINT:

tools/tui/readline/api.go

@@ -4,6 +4,7 @@ package readline
 
 import (
 	"fmt"
+	"strings"
 
 	"kitty/tools/tui/loop"
 	"kitty/tools/wcswidth"
@@ -59,7 +60,8 @@ type Readline struct {
 	// Input lines
 	lines []string
 	// The cursor position in the text
-	cursor Position
+	cursor                 Position
+	bracketed_paste_buffer strings.Builder
 }
 
 func New(loop *loop.Loop, r RlInit) *Readline {
@@ -127,6 +129,15 @@ func (self *Readline) OnKeyEvent(event *loop.KeyEvent) error {
 }
 
 func (self *Readline) OnText(text string, from_key_event bool, in_bracketed_paste bool) error {
+	if in_bracketed_paste {
+		self.bracketed_paste_buffer.WriteString(text)
+		return nil
+	}
+	if self.bracketed_paste_buffer.Len() > 0 {
+		self.bracketed_paste_buffer.WriteString(text)
+		text = self.bracketed_paste_buffer.String()
+		self.bracketed_paste_buffer.Reset()
+	}
 	self.add_text(text)
 	return nil
 }

tools/wcswidth/escape-code-parser.go

@@ -46,13 +46,14 @@ type EscapeCodeParser struct {
 	current_callback       func([]byte) error
 
 	// Callbacks
-	HandleRune func(rune) error
-	HandleCSI  func([]byte) error
-	HandleOSC  func([]byte) error
-	HandleDCS  func([]byte) error
-	HandlePM   func([]byte) error
-	HandleSOS  func([]byte) error
-	HandleAPC  func([]byte) error
+	HandleRune                func(rune) error
+	HandleEndOfBracketedPaste func()
+	HandleCSI                 func([]byte) error
+	HandleOSC                 func([]byte) error
+	HandleDCS                 func([]byte) error
+	HandlePM                  func([]byte) error
+	HandleSOS                 func([]byte) error
+	HandleAPC                 func([]byte) error
 }
 
 func (self *EscapeCodeParser) InBracketedPaste() bool { return self.state == bracketed_paste }
@@ -183,6 +184,9 @@ func (self *EscapeCodeParser) dispatch_char(ch utils.UTF8State) error {
 				self.bracketed_paste_buffer = append(self.bracketed_paste_buffer, ch)
 				if self.bracketed_paste_buffer[len(self.bracketed_paste_buffer)-1] == '~' {
 					self.reset_state()
+					if self.HandleEndOfBracketedPaste != nil {
+						self.HandleEndOfBracketedPaste()
+					}
 				}
 				return nil
 			} else {