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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { useStdin, useStdout } from 'ink';
import { useEffect, useState } from 'react';
// ANSI escape codes to enable/disable terminal focus reporting
const ENABLE_FOCUS_REPORTING = '\x1b[?1004h';
const DISABLE_FOCUS_REPORTING = '\x1b[?1004l';
// ANSI escape codes for focus events
const FOCUS_IN = '\x1b[I';
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;
};
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