From d22244d1352c2a63b2230ddd97a9ea0fc943dd07 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 12 Jul 2025 09:22:27 +0530
Subject: [PATCH] Micro-optimization

---
 tools/tui/loop/mouse.go | 9 +++++----
 tools/tui/loop/run.go   | 1 -
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/tui/loop/mouse.go b/tools/tui/loop/mouse.go
index 0a72a52c6..a14e8c96a 100644
--- a/tools/tui/loop/mouse.go
+++ b/tools/tui/loop/mouse.go
@@ -218,8 +218,7 @@ func pixel_to_cell(px, length, cell_length int) int {
 	return 0
 }
 
-func decode_sgr_mouse(text string, screen_size ScreenSize) *MouseEvent {
-	last_letter := text[len(text)-1]
+func decode_sgr_mouse(text string, screen_size ScreenSize, last_letter byte) *MouseEvent {
 	text = text[:len(text)-1]
 	parts := strings.Split(text, ";")
 	if len(parts) != 3 {
@@ -276,8 +275,10 @@ func MouseEventFromCSI(csi string, screen_size ScreenSize) *MouseEvent {
 	if last_char != 'm' && last_char != 'M' {
 		return nil
 	}
-	if !strings.HasPrefix(csi, "<") {
+	switch csi[0] {
+	case '<':
+		return decode_sgr_mouse(csi[1:], screen_size, last_char)
+	default:
 		return nil
 	}
-	return decode_sgr_mouse(csi[1:], screen_size)
 }
diff --git a/tools/tui/loop/run.go b/tools/tui/loop/run.go
index 673d108b6..6fef699da 100644
--- a/tools/tui/loop/run.go
+++ b/tools/tui/loop/run.go
@@ -119,7 +119,6 @@ func (self *Loop) handle_csi(raw []byte) (err error) {
 			return self.OnFocusChange(csi == "I")
 		}
 		return nil
-
 	}
 	ke := KeyEventFromCSI(csi)
 	if ke != nil {