export const fold = (str: string, len?: number) => {
	len = len !== undefined ? len - 1 : 79;
  const split = str.split(" ");
  let strarr = [];
  let strlen = 0;
  do {
    let w = split.shift(), wlen = w.length;
    if (strlen + wlen > len) {
			strarr.push('\n' + w);
			strlen = wlen;
			continue;
		} else if (strlen + wlen == len) {
			strarr.push(w + '\n');
			strlen = wlen;
			continue;
		} else {
			strarr.push(w);
			strlen += wlen + 1;
		}
  } while (split.length > 0);
  return strarr.join(" ");
}