Improve 8bcDump

Improve 2xAA's 8bcdump site (non-ID3 mode), adding a last played list and emboldening the currently playing song.
当前为 2017-03-29 提交的版本，查看最新版本。
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// ==UserScript==
// @name        Improve 8bcDump
// @namespace   Improve8bcDump
// @description Improve 2xAA's 8bcdump site (non-ID3 mode), adding a last played list and emboldening the currently playing song.
// @include     http://brkbrkbrk.com/8bcdump/
// @version     0.1
// @grant       none
// ==/UserScript==

(function() {
  // The currently playing song should appear bold in list views.
  // .playing is a single <li> in the list of all songs.
  // .lastPlayed is an <ol> containing the last played songs.
  
  var styleEl = document.createElement('style');
  styleEl.innerHTML  = '.playing, .lastPlayed li:first-child { font-weight: bold; }';
  styleEl.innerHTML += '.playing:after, .lastPlayed li:first-child:after { content: " (playing)" }';
  document.body.appendChild(styleEl);
  
  // Create a queue for the last played songs.
  // The queue is realized in an <ol>, contained in parentElement.
  
  function LastPlayedList(maxLength, parentElement) {
    // Create a heading for the last played list
    var heading = document.createElement('h2');
    heading.textContent = 'Last played';
    parentElement.appendChild(heading);
    
    // Create the list itself
    var list = document.createElement('ol');
    list.className = 'lastPlayed';
    parentElement.appendChild(list);
    
    // Push songs through the stack
    this.push = function(song) {
      var nodes = list.childNodes;
      
      if (nodes.length == maxLength) {
        list.removeChild(nodes[nodes.length - 1]);
      }
      
      var newItem = document.createElement('li');
      newItem.textContent = song;
      
      list.insertBefore(newItem, nodes[0]);
    }
  }
  
  // Create a list at the bottom of the page to hold the last 10 songs
  var lastPlayedDiv = document.createElement('div');
  document.body.appendChild(lastPlayedDiv);
  
  var lastPlayedList = new LastPlayedList(10, lastPlayedDiv);
  
  // The player at the bottom of the page
  // should also show the filename when playing songs.
  
  var updateID3_super = window.updateID3;
  
  // Override the existing updateID3 method
  
  window.updateID3 = function(id3) {
    updateID3_super(id3);
    
    var url = document.querySelector('li.playing a').href;
    var urlParts = decodeURIComponent(url).split('/');
    var filename = urlParts.pop();
    
    var liID3 = document.querySelector('li.id3 ');
    liID3.textContent += ', Filename: ' + filename;
    
    // Add the current song to the last played list
    lastPlayedList.push(liID3.textContent);
  }
  
}());