Merge pull request #159 from julienduchesne/optimize-nav-generation

Optimized nav generation

_includes/nav.html

 <nav role="navigation" aria-label="Main navigation">
   <ul class="navigation-list">
-    {% assign pages_list = site.html_pages | sort:"nav_order" %}
-    {% for node in pages_list %}
-      {% unless node.nav_exclude %}
-        {% if node.parent == nil %}
+    {%- assign pages_list = site.html_pages | sort:"nav_order" -%}
+    {%- for node in pages_list -%}
+      {%- unless node.nav_exclude -%}
+        {%- if node.parent == nil -%}
           <li class="navigation-list-item{% if page.url == node.url or page.parent == node.title or page.grand_parent == node.title %} active{% endif %}">
-            {% if page.parent == node.title or page.grand_parent == node.title %}
-              {% assign first_level_url = node.url | absolute_url %}
-            {% endif %}
+            {%- if page.parent == node.title or page.grand_parent == node.title -%}
+              {%- assign first_level_url = node.url | absolute_url -%}
+            {%- endif -%}
             <a href="{{ node.url | absolute_url }}" class="navigation-list-link{% if page.url == node.url %} active{% endif %}">{{ node.title }}</a>
-            {% if node.has_children %}
-              {% assign children_list = site.html_pages | sort:"nav_order" %}
+            {%- if node.has_children -%}
+              {%- assign children_list = site.html_pages | where: "parent", node.title | sort:"nav_order" -%}
               <ul class="navigation-list-child-list ">
-                {% for child in children_list %}
-                  {% if child.parent == node.title %}
-                    <li class="navigation-list-item {% if page.url == child.url or page.parent == child.title %} active{% endif %}">
-                      {% if page.url == child.url or page.parent == child.title %}
-                        {% assign second_level_url = child.url | absolute_url %}
-                      {% endif %}
-                      <a href="{{ child.url | absolute_url }}" class="navigation-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
-                      {% if child.has_children %}
-                        {% assign grand_children_list = site.html_pages | sort:"nav_order" %}
+                {%- for child in children_list -%}
+                  <li class="navigation-list-item {% if page.url == child.url or page.parent == child.title %} active{% endif %}">
+                    {%- if page.url == child.url or page.parent == child.title -%}
+                      {%- assign second_level_url = child.url | absolute_url -%}
+                    {%- endif -%}
+                    <a href="{{ child.url | absolute_url }}" class="navigation-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
+                    {%- if child.has_children -%}
+                        {%- assign grand_children_list = site.html_pages | where: "parent", child.title | sort:"nav_order" -%}
                         <ul class="navigation-list-child-list">
-                          {% for grand_child in grand_children_list %}
-                            {% if grand_child.parent == child.title %}
-                              <li class="navigation-list-item {% if page.url == grand_child.url %} active{% endif %}">
-                                <a href="{{ grand_child.url | absolute_url }}" class="navigation-list-link{% if page.url == grand_child.url %} active{% endif %}">{{ grand_child.title }}</a>
-                              </li>
-                            {% endif %}
-                          {% endfor %}
-                        </ul>
-                      {% endif %}
-                    </li>
-                  {% endif %}
-                {% endfor %}
+                        {%- for grand_child in grand_children_list -%}
+                          <li class="navigation-list-item {% if page.url == grand_child.url %} active{% endif %}">
+                            <a href="{{ grand_child.url | absolute_url }}" class="navigation-list-link{% if page.url == grand_child.url %} active{% endif %}">{{ grand_child.title }}</a>
+                          </li>
+                        {%- endfor -%}
+                      </ul>
+                    {%- endif -%}
+                  </li>
+                {%- endfor -%}
               </ul>
-            {% endif %}
+            {%- endif -%}
           </li>
-        {% endif %}
-      {% endunless %}
-    {% endfor %}
+        {%- endif -%}
+      {%- endunless -%}
+    {%- endfor -%}
   </ul>
 </nav>