journalduhacker/app/views/comments/threads.html.erb

<% @threads.each do |thread| %>
<ol class="comments comments1">
  <% comments_by_parent = thread.group_by(&:parent_comment_id) %>
  <% subtree = comments_by_parent[nil] %>
  <% ancestors = [] %>

  <% while subtree %>
    <% if (comment = subtree.shift) %>
      <li>
      <%= render "comments/comment", :comment => comment,
        :show_story => ancestors.empty? %>

      <% if (children = comments_by_parent[comment.id]) %>
        <% ancestors << subtree %>
        <% subtree = children %>
        <ol class="comments">
      <% else %>
        <ol class="comments"></ol></li>
      <% end %>
    <% elsif (subtree = ancestors.pop) %>
      </ol></li>
    <% end %>
  <% end %>
</ol>
<% end %>