blog_os/_includes/post_teaser.html

<article class="post" id="{{ post.id }}">
  <h1 class="post-title">
    <a href="{{ site.baseurl }}{{ post.url }}">
      {{ post.title }}
    </a>
  </h1>

  <span class="post-date">
    <time datetime="{{ post.date | date_to_xmlschema }}">{{ post.date | date_to_string }}</time>
    {% if post.updated %}
      (updated on {{ post.updated | date_to_string }})
    {% endif %}
  </span>

  {% if post.content contains '<!--more-->' %}
    {{ post.content | split:'<!--more-->' | first }}
  {% else %}
    {{ post.excerpt }}
  {% endif %}
</article>
{% if forloop.last == false %}
  <hr>
{% endif %}