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Merge pull request #116 from aakhter/pr/cod-35-codex-polish

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fix(codex): strip alt-screen + scrollback-erase from the codex byte stream
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Ark0N
2026-06-10 22:52:02 +02:00
committed by GitHub
parent f0db5f827f 7eda39e7f7
commit 1cf5c8c8ad
3 changed files with 359 additions and 1 deletions
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src/web/routes/session-routes.ts
+36 -1
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@@ -66,6 +66,31 @@ const CLAUDE_BANNER_PATTERN = /\x1b\[1mClaud/;
const CTRL_L_PATTERN = /\x0c/g;
const LEADING_WHITESPACE_PATTERN = /^[\s\r\n]+/;
/**
* Match xterm alternate-screen mode toggles + the standalone scrollback-erase.
*
* - DECSET/DECRST 47, 1047, 1049 = enter/exit alternate screen buffer
* (1049 also saves cursor and clears the alt buffer).
* - CSI 3 J = erase saved lines (scrollback).
*
* Codex emits `\x1b[?1049h` and clear-scrollback sequences during startup and
* on repaint. xterm.js obeys them by switching to the alt buffer (no native
* scrollback) and wiping saved lines, so the user's conversation history
* disappears on every tab switch / pane refresh. Stripping these from the
* replayed byte stream keeps everything in the main buffer with scrollback
* intact. Mirrors the live-stream strip in Session._handleTerminalOutput.
*/
// eslint-disable-next-line no-control-regex
const ALT_SCREEN_TOGGLE_PATTERN = /\x1b\[\?(?:47|1047|1049)[hl]/g;
// eslint-disable-next-line no-control-regex
const ERASE_SCROLLBACK_PATTERN = /\x1b\[3J/g;
// Mouse-tracking enables (X10/button/any-event/UTF-8/SGR/alt-scroll) — once on,
// xterm.js forwards wheel events to the app instead of scrolling the viewport.
// Live streams are stripped at the source, but buffers persisted BEFORE that
// strip existed can still carry them; strip on replay for parity.
// eslint-disable-next-line no-control-regex
const MOUSE_TRACKING_PATTERN = /\x1b\[\?(?:1000|1001|1002|1003|1005|1006|1007)[hl]/g;
/**
* Strip redundant Ink spinner/status-bar redraw frames from the terminal buffer.
* Ink (Claude Code's TUI) uses absolute cursor positioning (CSI n d = VPA) to animate
@@ -917,7 +942,17 @@ export function registerSessionRoutes(
// During long thinking phases, Ink rewrites the same rows thousands of times
// (500KB+). Without stripping, tail mode returns only spinner frames and
// the terminal appears empty when switching tabs.
const strippedBuffer = stripInkRedrawBloat(rawBuffer);
let strippedBuffer = stripInkRedrawBloat(rawBuffer);
// Strip alt-screen toggles and scrollback-erase from codex byte streams.
// xterm.js obeys them by switching to its scrollback-less alt buffer and
// wiping saved lines, so conversation history disappears on tab switch.
if (session.mode === 'codex') {
strippedBuffer = strippedBuffer
.replace(ALT_SCREEN_TOGGLE_PATTERN, '')
.replace(ERASE_SCROLLBACK_PATTERN, '')
.replace(MOUSE_TRACKING_PATTERN, '');
}
if (tailBytes > 0 && strippedBuffer.length > tailBytes) {
// Fast path: tail from the end, skip expensive banner search on full 2MB buffer.