// ==UserScript==
// @name          Flickr Comment Highlighter
// @namespace     http://www.dopiaza.org/flickr/greasemonkey/
// @description   Highlight Flickr Comments
// @include       http://www.flickr.com/*
// @include       http://flickr.com/*
// ==/UserScript==


var buddyIconPattern = /^http:\/\/static.flickr.com\/\d+\/buddyicons\/(.+).jpg/;
var blockheadPattern = /^http:\/\/www.flickr.com\/images\/buddyicon.jpg\?(.+)$/;

var myNsid = unsafeWindow.global_nsid;

var commenters = document.evaluate(
  "//td[@class='Who']",
  document,
  null,
  XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
  null);

for (var i = 0; i < commenters.snapshotLength; i++) 
{
  var isMyComment = false;	

  var tdCommenter = commenters.snapshotItem(i);

  // We are looking for the buddy icon contained within
  var images = tdCommenter.getElementsByTagName('IMG');

  for (var j = 0; j < images.length; j++)
  {
    var img = images[j];
    var src = img.getAttribute('src');
    var result = buddyIconPattern.exec(src);

    if (result == null)
    {
      // Try the second version, just in case you have no buddy icon set
      result = blockheadPattern.exec(src);
    }

    if (result != null)
    {
      // This is the buddy icon
      var nsid = result[1];
      if (nsid == myNsid)
      {
        isMyComment = true;
      }

      break;
    }
  }

  if (isMyComment)
  {
    // Need to restyle the comment to highlight it.
    // The parent container is the table row, and contains the commenter details
    // and the comment itself
    var container = tdCommenter.parentNode;
    container.style.backgroundColor = '#EEEEEE';
  }    
}