Update related posts

_layouts/post.html

@@ -7,3 +7,32 @@ layout: default
 <div class="content">
     <div class="post">{{ content }}</div>
 </div>
+
+{% assign hasSimilar = '' %}
+{% for post in site.posts  %}
+    {% assign postHasSimilar = false %}
+    {% for tag in post.categories %}
+        {% for thisTag in page.categories %}
+            {% if postHasSimilar == false and hasSimilar.size < 6 and post != page and tag == thisTag %}
+                {% if hasSimilar.size == 0 %}
+                <div class="panel-body">
+                <h4>Related Posts</h4>
+                <ul>
+                {% endif %}
+                <li class="relatedPost">
+                    <a href="{{ site.url }}{{ post.url }}">{{ post.title }}
+                    {% if post.categories %}
+                        (Categories: {{ post.categories | join: ', ' }})
+                    {% endif %}
+                    </a>
+                </li>
+                {% capture hasSimilar %}{{ hasSimilar }}*{% endcapture %}
+                {% assign postHasSimilar = true %}
+            {% endif %}
+        {% endfor %}
+    {% endfor %}
+{% endfor %}
+{% if hasSimilar.size > 0 %}
+    </ul>
+    </div>
+{% endif %}