Function useFocus

packages/cli/src/ui/hooks/useFocus.ts:19–49

()

export const FOCUS_OUT = '\x1b[O';

export const useFocus = () => {
  const { stdin } = useStdin();
  const { stdout } = useStdout();
  const [isFocused, setIsFocused] = useState(true);

  useEffect(() => {
    const handleData = (data: Buffer) => {
      const sequence = data.toString();
      const lastFocusIn = sequence.lastIndexOf(FOCUS_IN);
      const lastFocusOut = sequence.lastIndexOf(FOCUS_OUT);

      if (lastFocusIn > lastFocusOut) {
        setIsFocused(true);
      } else if (lastFocusOut > lastFocusIn) {
        setIsFocused(false);
      }
    };

    // Enable focus reporting
    stdout?.write(ENABLE_FOCUS_REPORTING);
    stdin?.on('data', handleData);

    return () => {
      // Disable focus reporting on cleanup
      stdout?.write(DISABLE_FOCUS_REPORTING);
      stdin?.removeListener('data', handleData);
    };
  }, [stdin, stdout]);

  return isFocused;
};