<div class="unit one-fifth hide-on-mobiles">
  <aside>
    {% for section in site.data.tutorials -%}
      <h4>{{ section.title }}</h4>
      <ul>
      {% for item in section.tutorials -%}
        {% assign item_url = item | prepend:"/tutorials/" | append:"/" -%}
        {% assign p = site.tutorials | where:"url", item_url | first -%}
        <li {%- if item_url == page.url %} class="current" {%- endif %}><a href="{{ p.url | relative_url }}">
          {{- p.title -}}
        </a></li>
      {% endfor -%}
      </ul>
    {% endfor -%}
  </aside>
</div>
