Function getCursorRow

cli/_prompt_select.ts:209–227

(
  input: typeof Deno.stdin,
  output: typeof Deno.stdout,
)

}

function getCursorRow(
  input: typeof Deno.stdin,
  output: typeof Deno.stdout,
): number | undefined {
  output.writeSync(QUERY_CURSOR_POSITION);

  const buffer = new Uint8Array(32);
  const n = input.readSync(buffer);
  if (n === null || n === 0) return undefined;

  const response = decoder.decode(buffer.subarray(0, n)).trim();

  // deno-lint-ignore no-control-regex
  const match = response.match(/\x1b\[(\d+);(\d+)R/);
  if (match) {
    return parseInt(match[1]!, 10);
  }
  return undefined;
}