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Gertykhon / Joyreactor Longpost Minimizer

// ==UserScript==
// @name         Joyreactor Longpost Minimizer
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Добавляет в нижний левый угол кнопку для сворачивания длиннопостов
// @author       Gertykhon
// @updateURL    https://openuserjs.org/meta/Gertykhon/Joyreactor_Longpost_Minimizer.meta.js
// @include      *reactor.cc*
// @include      *joyreactor.cc*
// @include      *jr-proxy.com*
// @grant        none
// @license MIT
// ==/UserScript==

(function () {
  'use strict';

  /*
   * Leoric(@joyreactor.cc)
   */

  var cuts = [],
    last,
    i = 0;

  var btn = document.createElement('div');
  btn.innerHTML = '<span>&#8613;</span>';
  btn.style = 'position:fixed; left:10px; bottom:15px; background-color:white; opacity:0.7; ' +
    'cursor:pointer; padding:5px; font-size: 20pt; z-index:9999;';

  var loop = setInterval(function () {
    for (var k of document.getElementsByClassName('post_content_expand')) {
      if (k.style.display == 'block') cuts.push(k);
    }
    var al = document.getElementsByClassName('allow_long')[0];
    if (al) {
      al.classList.remove('allow_long');
      al.classList.add('post_content_cut');
      al.style = 'max-height: 100%;';
      cuts.push(al.parentNode.getElementsByClassName('post_content_expand')[0]);
    }
    if (cuts.length > 0) {
      document.body.appendChild(btn);
      clearInterval(loop);
    }
    if (i > 9) clearInterval(loop);
    i++;
  }, 1000);

  btn.onclick = function () {
    for (var j of document.querySelectorAll('div[style="max-height: 100%;"]')) {
      j.style = '';
      last = j;
    }
    for (var k of cuts) {
      k.style.display = 'block';
    }
    if (last) last.parentNode.parentNode.parentNode.scrollIntoView();
    setTimeout(function () {
      if (last) last.parentNode.getElementsByClassName('post_content_expand')[0].scrollIntoView();
      last = null;
    }, 500);
  };
})();