From 1e5d39d9b1336f0b95fc2cdaf0175f04ff4f4392 Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Mon, 1 Jul 2024 20:06:51 +0200
Subject: [PATCH] fix(windows): unbreak escape sequence handling

---
 src/windows/Tty.zig | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/windows/Tty.zig b/src/windows/Tty.zig
index 503d7a6..fc3d56b 100644
--- a/src/windows/Tty.zig
+++ b/src/windows/Tty.zig
@@ -166,11 +166,13 @@ pub fn eventFromRecord(self: *Tty, record: *const INPUT_RECORD, state: *EventSta
 
             const base_layout: u16 = switch (event.wVirtualKeyCode) {
                 0x00 => blk: { // delivered when we get an escape sequence or a unicode codepoint
+                    if (state.ansi_idx == 0 and event.uChar.AsciiChar != 27)
+                        break :blk event.uChar.UnicodeChar;
                     state.ansi_buf[state.ansi_idx] = event.uChar.AsciiChar;
                     state.ansi_idx += 1;
+                    if (state.ansi_idx <= 2) return null;
                     switch (state.ansi_buf[1]) {
                         '[' => { // CSI, read until 0x40 to 0xFF
-                            if (state.ansi_idx <= 2) return null;
                             switch (event.uChar.UnicodeChar) {
                                 0x40...0xFF => {
                                     return .cap_da1;
@@ -197,9 +199,8 @@ pub fn eventFromRecord(self: *Tty, record: *const INPUT_RECORD, state: *EventSta
                                 else => return null,
                             }
                         },
-                        else => {},
+                        else => return null,
                     }
-                    break :blk event.uChar.UnicodeChar;
                 },
                 0x08 => Key.backspace,
                 0x09 => Key.tab,