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fix(tui): add Kitty CSI-u printable decoding to Input component, closes #1857

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This commit is contained in:
Mario Zechner 2026-03-06 00:33:58 +01:00
parent 863135d429
commit 9bcf06c056
6 changed files with 74 additions and 43 deletions
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44
packages/tui/src/components/editor.ts
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@ -1,6 +1,6 @@
import type { AutocompleteProvider, CombinedAutocompleteProvider } from "../autocomplete.js";
import { getEditorKeybindings } from "../keybindings.js";
import { matchesKey } from "../keys.js";
import { decodeKittyPrintable, matchesKey } from "../keys.js";
import { KillRing } from "../kill-ring.js";
import { type Component, CURSOR_MARKER, type Focusable, type TUI } from "../tui.js";
import { UndoStack } from "../undo-stack.js";
@ -92,48 +92,6 @@ export function wordWrapLine(line: string, maxWidth: number): TextChunk[] {
}
// Kitty CSI-u sequences for printable keys, including optional shifted/base codepoints.
const KITTY_CSI_U_REGEX = /^\x1b\[(\d+)(?::(\d*))?(?::(\d+))?(?:;(\d+))?(?::(\d+))?u$/;
const KITTY_MOD_SHIFT = 1;
const KITTY_MOD_ALT = 2;
const KITTY_MOD_CTRL = 4;
const KITTY_LOCK_MASK = 64 + 128; // Caps Lock + Num Lock
const KITTY_ALLOWED_MODIFIERS = KITTY_MOD_SHIFT | KITTY_LOCK_MASK;
// Decode a printable CSI-u sequence, preferring the shifted key when present.
function decodeKittyPrintable(data: string): string | undefined {
const match = data.match(KITTY_CSI_U_REGEX);
if (!match) return undefined;
// CSI-u groups: <codepoint>[:<shifted>[:<base>]];<mod>u
const codepoint = Number.parseInt(match[1] ?? "", 10);
if (!Number.isFinite(codepoint)) return undefined;
const shiftedKey = match[2] && match[2].length > 0 ? Number.parseInt(match[2], 10) : undefined;
const modValue = match[4] ? Number.parseInt(match[4], 10) : 1;
// Modifiers are 1-indexed in CSI-u; normalize to our bitmask.
const modifier = Number.isFinite(modValue) ? modValue - 1 : 0;
// Only accept printable CSI-u input for plain or Shift-modified text keys.
// Reject unsupported modifier bits (e.g. Super/Meta) to avoid inserting
// characters from modifier-only terminal events.
if ((modifier & ~KITTY_ALLOWED_MODIFIERS) !== 0) return undefined;
if (modifier & (KITTY_MOD_ALT | KITTY_MOD_CTRL)) return undefined;
// Prefer the shifted keycode when Shift is held.
let effectiveCodepoint = codepoint;
if (modifier & KITTY_MOD_SHIFT && typeof shiftedKey === "number") {
effectiveCodepoint = shiftedKey;
}
// Drop control characters or invalid codepoints.
if (!Number.isFinite(effectiveCodepoint) || effectiveCodepoint < 32) return undefined;
try {
return String.fromCodePoint(effectiveCodepoint);
} catch {
return undefined;
}
}
interface EditorState {
lines: string[];
cursorLine: number;