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nastykast / Community Playlist Generator

// ==UserScript==
// @name        Community Playlist Generator
// @namespace   Violentmonkey Scripts
// @include     https://redacted.ch/forums.php?action=viewthread&threadid=50337*
// @grant       none
// @version     0.2
// @author      nastykast
// @copyright 2021, nastykast (https://openuserjs.org/users/nastykast)
// @license MIT
// @description 6/3/2021, 11:05:15 AM
// ==/UserScript==

(function() {
  'use strict';
  var posts = document.querySelectorAll('.forum_post, .forum-post');
  for (var i = 0; i < posts.length; i++) {
    var p = posts[i];
    if (p.getAttribute('class').indexOf('preview_wrap') != -1) {
      continue;
    }
    if (p.id == 'reply_box') {
      continue;
    }
    var post_header_links = p.getElementsByTagName('td')[0].firstElementChild;
    var button = document.createElement('a');
    button.href = 'javascript:void(0);';
    button.innerHTML = 'Generate playlist';
    button.setAttribute('class', 'brackets');
    button.addEventListener('click', generate.bind(undefined, p), false);
    post_header_links.appendChild(document.createTextNode(' - '));
    post_header_links.appendChild(button);
  }
})();

function generate(postTable) {
  var links = postTable.getElementsByTagName('a');
  var ids = [];
  for (var i = 0; i < links.length; i++) {
    var id = '';
    if (links[i].href.includes("youtube")) {
      var pieces = links[i].href.split("?");
      if (pieces.length > 1) {    
        var params = pieces[1].split("&");
        for (var j = 0; j < params.length; j++) {
          if (params[j].startsWith("v=")) {
            id = params[j].substring(2);
          }
        }
      }
    } else if (links[i].href.includes("youtu.be")) {
      id = links[i].href.split("/").pop();
    }
    if (id) {
      ids.push(id);
    }
  }
  var playlist = 'https://youtube.com/watch_videos?video_ids=' + ids.join();
  window.open(playlist, '_blank');
}