add TOC

templates/page.html

@@ -12,6 +12,25 @@
         <time datetime="{{ page.date }}">{{ page.date | date(format="%B %d, %Y") }}</time>
         {% endif %}
     </header>
+    {% if page.extra.toc | default(value=false) %}
+    <nav class="toc">
+        <p class="toc-title">Table of Contents</p>
+        <ul>
+        {% for h2 in page.toc %}
+            <li>
+                <a href="{{ h2.permalink | safe }}">{{ h2.title }}</a>
+                {% if h2.children %}
+                <ul>
+                    {% for h3 in h2.children %}
+                    <li><a href="{{ h3.permalink | safe }}">{{ h3.title }}</a></li>
+                    {% endfor %}
+                </ul>
+                {% endif %}
+            </li>
+        {% endfor %}
+        </ul>
+    </nav>
+    {% endif %}
     <div class="content">
         {{ page.content | safe }}
     </div>