Add custom template tags and filters

Author: samwelkanda

mysite/apps/blog/templates/blog/post/detail.html

@@ -1,4 +1,5 @@
 {% extends "base.html" %}
+{% load blog_tags %}
 
 {% block title %}{{ post.title }}{% endblock %}
 
@@ -7,7 +8,7 @@ <h1>{{ post.title }}</h1>
   <p class="date">
     Published {{ post.publish }} by {{ post.author }}
   </p>
-  {{ post.body|linebreaks }}
+  {{ post.body|markdown }}
   <p>
     <a href="{% url "blog:post_share" post.id %}">
       Share this post

mysite/apps/blog/templates/blog/post/latest_posts.html

@@ -0,0 +1,7 @@
+<ul>
+    {% for post in latest_posts %}
+      <li>
+        <a href="{{ post.get_absolute_url }}">{{ post.title }}</a>
+      </li>
+    {% endfor %}
+  </ul>

mysite/apps/blog/templates/blog/post/list.html

@@ -1,4 +1,5 @@
 {% extends "base.html" %}
+{% load blog_tags %}
 
 {% block title %}My Blog{% endblock %}
 
@@ -26,7 +27,7 @@ <h2>
     <p class="date">
       Published {{ post.publish }} by {{ post.author }}
     </p>
-    {{ post.body|truncatewords:30|linebreaks }}
+    {{ post.body|markdown|truncatewords_html:30 }}
   {% endfor %}
   {% include "pagination.html" with page=posts %}
 {% endblock %}

mysite/apps/blog/templatetags/__init__.py

@@ -0,0 +1,31 @@
+from django import template
+from django.db.models import Count
+from django.utils.safestring import mark_safe
+import markdown
+from ..models import Post
+
+
+register = template.Library()
+
+
+@register.simple_tag
+def total_posts():
+    return Post.published.count()
+
+
+@register.inclusion_tag('blog/post/latest_posts.html')
+def show_latest_posts(count=5):
+    latest_posts = Post.published.order_by('-publish')[:count]
+    return {'latest_posts': latest_posts}
+
+
+@register.simple_tag
+def get_most_commented_posts(count=5):
+    return Post.published.annotate(
+               total_comments=Count('comments')
+           ).order_by('-total_comments')[:count]
+
+
+@register.filter(name='markdown')
+def markdown_format(text):
+    return mark_safe(markdown.markdown(text))