Function parseKittyImageHeader

packages/pi-tui/src/tui.ts:35–58

(line: string)

}

function parseKittyImageHeader(line: string): KittyImageHeader | undefined {
	const sequenceStart = line.indexOf(KITTY_SEQUENCE_PREFIX);
	if (sequenceStart === -1) return undefined;

	const paramsStart = sequenceStart + KITTY_SEQUENCE_PREFIX.length;
	const paramsEnd = line.indexOf(";", paramsStart);
	if (paramsEnd === -1) return undefined;

	const ids: number[] = [];
	let rows = 1;
	const params = line.slice(paramsStart, paramsEnd);
	for (const param of params.split(",")) {
		const [key, value] = param.split("=", 2);
		if (value === undefined) continue;
		const numberValue = Number(value);
		if (!Number.isInteger(numberValue) || numberValue <= 0 || numberValue > 0xffffffff) continue;
		if (key === "i") {
			ids.push(numberValue);
		} else if (key === "r") {
			rows = numberValue;
		}
	}
	return { ids, rows };
}

function extractKittyImageIds(line: string): number[] {
	return parseKittyImageHeader(line)?.ids ?? [];