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fix(tui): enable VT input mode on Windows (#1495)

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This fixes Shift+Tab not being recognized correctly
This commit is contained in:
Duncan Ogilvie 2026-02-14 01:45:11 +01:00 • committed by GitHub
parent 6312fc2e42
commit 9e22d3913a
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GPG key ID: B5690EEEBB952194
4 changed files with 49 additions and 10 deletions
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32
packages/tui/src/terminal.ts
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@ -1,4 +1,5 @@
import * as fs from "node:fs";
import koffi from "koffi";
import { setKittyProtocolActive } from "./keys.js";
import { StdinBuffer } from "./stdin-buffer.js";
@ -86,6 +87,12 @@ export class ProcessTerminal implements Terminal {
process.kill(process.pid, "SIGWINCH");
}
// On Windows, enable ENABLE_VIRTUAL_TERMINAL_INPUT so the console sends
// VT escape sequences (e.g. \x1b[Z for Shift+Tab) instead of raw console
// events that lose modifier information. Must run AFTER setRawMode(true)
// since that resets console mode flags.
this.enableWindowsVTInput();
// Query and enable Kitty keyboard protocol
// The query handler intercepts input temporarily, then installs the user's handler
// See: https://sw.kovidgoyal.net/kitty/keyboard-protocol/
@ -158,6 +165,31 @@ export class ProcessTerminal implements Terminal {
process.stdout.write("\x1b[?u");
}
/**
* On Windows, add ENABLE_VIRTUAL_TERMINAL_INPUT (0x0200) to the stdin
* console handle so the terminal sends VT sequences for modified keys
* (e.g. \x1b[Z for Shift+Tab). Without this, libuv's ReadConsoleInputW
* discards modifier state and Shift+Tab arrives as plain \t.
*/
private enableWindowsVTInput(): void {
if (process.platform !== "win32") return;
try {
const k32 = koffi.load("kernel32.dll");
const GetStdHandle = k32.func("void* __stdcall GetStdHandle(int)");
const GetConsoleMode = k32.func("bool __stdcall GetConsoleMode(void*, _Out_ uint32_t*)");
const SetConsoleMode = k32.func("bool __stdcall SetConsoleMode(void*, uint32_t)");
const STD_INPUT_HANDLE = -10;
const ENABLE_VIRTUAL_TERMINAL_INPUT = 0x0200;
const handle = GetStdHandle(STD_INPUT_HANDLE);
const mode = new Uint32Array(1);
GetConsoleMode(handle, mode);
SetConsoleMode(handle, mode[0]! | ENABLE_VIRTUAL_TERMINAL_INPUT);
} catch {
// koffi not available — Shift+Tab won't be distinguishable from Tab
}
}
async drainInput(maxMs = 1000, idleMs = 50): Promise<void> {
if (this._kittyProtocolActive) {
// Disable Kitty keyboard protocol first so any late key releases