// ==UserScript==
// @name           Mylist counter
// @namespace      http://efcl.info/
// @include        http://www.nicovideo.jp/mylist/*
// ==/UserScript==
(function() {
    
  var favicon = document.evaluate('//head/link[@rel="shortcut icon"]', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
  var canvas = document.createElement('canvas');
  var head = document.getElementsByTagName('head')[0];

  function updateFavicon() {
    var Mylist = document.evaluate('id("mylists")//tbody//tr[@valign="top"]', document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
    if(!Mylist.snapshotLength)
      return;
    //GM_log(Mylist.snapshotLength);
    var MylistCount = Mylist.snapshotLength;
    canvas.width = canvas.height = 16;
    with(canvas.getContext('2d')) {
      clearRect(0, 0, 16, 16);
      mozTextStyle = 22 + (MylistCount.toString().length) * -4 + "px sans-serif";
      translate(0, 14);
      mozDrawText(MylistCount);
    }
    favicon.href = canvas.toDataURL();
    head.appendChild(favicon);

  }
  updateFavicon();
})();
//.user.js