4chan sort comments

buttons to sort 4chan comments (placed under the thread watcher)
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// ==UserScript==
// @name        4chan sort comments
// @namespace   github.com/diegostafa/userscripts
// @match       https://boards.4chan.org/*/thread/*
// @match       https://boards.4channel.org/*/thread/*
// @grant       none
// @version     1.0
// @author      Diego <[email protected]> (github.com/diegostafa)
// @description buttons to sort 4chan comments (placed under the thread watcher)
// @run-at      document-end
// ==/UserScript==

const sortComments = (sortingRule) => {
  let thread = document.querySelector(".thread");
  let comments = [...thread.children];

  comments.shift(); // ignore OP
  comments.sort(sortingRule);
  comments.forEach(comment => {
    thread.appendChild(comment);
  });
};

const urlRegex = /.*:(\/\/|\?).*/gi;

const isImage = (file) => {
  return !file.endsWith(".webm") && !file.endsWith(".gif");
};

const byRepliesDesc = (a, b) => {
  const repliesA = a.querySelectorAll(".backlink > span").length;
  const repliesB = b.querySelectorAll(".backlink > span").length;
  return repliesB - repliesA;
};

const byTimeDesc = (a, b) => {
  const timeA = a.querySelector(".dateTime").getAttribute("data-utc");
  const timeB = b.querySelector(".dateTime").getAttribute("data-utc");
  return timeA - timeB;
};

const byImagesFirst = (a, b) => {
  const fileA = a.querySelector(".fileThumb");
  const fileB = b.querySelector(".fileThumb");

  if (fileB && isImage(fileB.getAttribute("href")))
    return 1;
  if (fileA && isImage(fileA.getAttribute("href")))
    return -1;
  return 0;
};

const byVideosFirst = (a, b) => {
  const fileA = a.querySelector(".fileThumb");
  const fileB = b.querySelector(".fileThumb");

  if (fileB && !isImage(fileB.getAttribute("href")))
    return 1;
  if (fileA && !isImage(fileA.getAttribute("href")))
    return -1;
  return 0;
};

const byLinksFirst = (a, b) => {
  const textA = a.querySelector(".postMessage").innerText;
  const textB = b.querySelector(".postMessage").innerText;

  return urlRegex.test(textB) - urlRegex.test(textA);
};

const createSortButton = (text, action) => {
  let button = document.createElement("div");
  button.addEventListener("click", action);
  button.innerHTML = text;
  button.style.backgroundColor = "#444444";
  button.style.color = "white";
  button.style.textAlign = "center";
  button.style.border = "none";
  button.style.padding = "2px";
  button.style.cursor = "pointer";
  return button;
};

const createBtnContainer = () => {
  let div = document.createElement("div");
  div.style.display = "grid";
  div.style.gridTemplateColumns = "repeat(2, 1fr)";
  div.style.gridGap = "2px";
  return div;
};


let threadWatcher = document.getElementById("threadWatcher");
let btnContainer = createBtnContainer();

btnContainer.appendChild(createSortButton("by replies", () => { sortComments(byRepliesDesc); }));
btnContainer.appendChild(createSortButton("by time", () => { sortComments(byTimeDesc); }));
btnContainer.appendChild(createSortButton("images first", () => { sortComments(byImagesFirst); }));
btnContainer.appendChild(createSortButton("videos first", () => { sortComments(byVideosFirst); }));
btnContainer.appendChild(createSortButton("links first", () => { sortComments(byLinksFirst); }));

threadWatcher.appendChild(btnContainer);