Jekyll automatically regenerates all changed files into a target directory _site. However it does not regenerate a file referencing another file which has just changed.

It has been particularly painful for index.html file where I reference a list of posts in a following loop:

{% for post in site.posts %}
    <span class="post-meta">
       {{ | date: "%b %-d, %Y" }}
       ({{ post.language | capitalize }})
      {% assign is_draft = (post.path | truncate: 6, "") %}
      {% if is_draft == "_draft" %} {% assign class_post_link = "post-link-draft" %}
      {% else %} {% assign class_post_link = "post-link" %}
      {% endif %}
      <a class="{{ class_post_link }}"
         href="{{ post.url | prepend: site.baseurl }}">{{ post.title }}</a>
{% endfor %}

Now, I keep a list of files in _drafts folder, they have no date specified, neither as a part of the filename nor in the YAML front matter. Jekyll updates their filenames with the current date when their content changes. But then it does not regenerate index.html. So far I forced the regeneration by touch index.html file, but did not seem to be neat solution I was searching for.

Much better approach is to add regenerate: true to my index.html YAML front matter. It forces the file to be included in each rebuild. And it happens automatically.

I found it described at Jekyll’s GitHub Project, as a merge of Incremental Regeneration, and it is also referenced at the original Jekyll’s Documentation.