Sidebar nav for pages/subpages in Siteleaf v1

sidebar_nav.html

{% comment %} 1. Extract 'section' from '/section/page/subpage' {% endcomment %}
{% assign section = url | remove_first:'/' | split:'/' | first %}

{% comment %} 2. Loop through pages in this section {% endcomment %}
<ul>
{% for page in site.pages[section].pages %}
  <li>
    <a href="{{page.url}}"{% if page.url == curent.url %}class="selected"{% endif %}>{{page.title}}</a>
    {% comment %} 3. Expand subnav for current page or any subpage {% endcomment %}
    {% if current.url contains page.url and page.pages.size > 0 %}
    <ul>
    {% for subpage in page.pages %}
      <li><a href="{{subpage.url}}"{% if page.url == curent.url %} class="selected"{% endif %}>{{subpage.title}}</a></li>
    {% endfor %}
    </ul>
    {% endif %}
  </li>
{% endfor %}
</ul>