Function truncateMiddle

example/tests/gm_xhr_test.js:365–377

(value, max)

  }

  function truncateMiddle(value, max) {
    const str = String(value);

    if (!Number.isFinite(max) || max <= 0) return "";
    if (str.length <= max) return str;
    if (max <= 3) return str.slice(0, max);

    const available = max - 1;
    const left = Math.ceil(available / 2);
    const right = Math.floor(available / 2);

    return `${str.slice(0, left)}…${str.slice(-right)}`;
  }

  function padRight(value, width) {
    return String(value).padEnd(width, " ");