bookmarklet-habrahabr-mark-all-comments-as-unread.js

(function() {
  // Mark all comments on habrahabr as unread.
  var nextNew = $("#xpanel .next_new");
  var prevNew = $("#xpanel .prev_new");
  var newCounter = $("#xpanel .new");
  var allHeads = $(".comment__head");
  var allComments = $(".content-list__item_comment");

  allHeads.addClass("comment__head_new-comment");

  allComments.addClass("js-comment_new");

  var allCommentsCount = allComments.length;

  var hasComments = (allCommentsCount > 0);

  if (hasComments) {
    newCounter.text(allCommentsCount);
  }

  newCounter.toggle(hasComments);
  prevNew.toggle(hasComments);
  nextNew.toggle(hasComments);

})();