A Jekyll plugin that makes it easily possible to check the existence of a file.
Copy file_exists.rb into the /_plugins/ directory of your Jekyll project.
The plugin adds a new custom liquid tag, which can be used as follows:
{% file_exists images/file-example.jpg %}
The output will be "true" or "false" (a string, not a boolean).
You can also use liquid objects within the tag:
{% file_exists {{ author_photo_url }} %}
Important: The path needs to start at the root level of your Jekyll project and without a leading slash /.
I’m using the plugin on My Morning Routine to check if an author image exists, otherwise Jekyll should use our placeholder image.
We’re saving the plugins output to author_photo:
{% capture author_photo %}{% file_exists {{ author_photo_url }} %}{% endcapture %}
If the author photo exists "true" we gonna use it, otherwise "false" we use the placeholder image.
{% if author_photo == "true" %}
{% assign author_photo = author_photo_url | prepend: "/" | prepend: site.baseurl %}
{% else %}
{% assign author_photo = "no-photo.jpg" | prepend: "/images/routines/" | prepend: site.baseurl %}
{% endif %}