How to list files in a directory with Liquid?

You can use this plugin. Copy and paste this code in a file inside the _plugins directory at the root of your Jekyll project.

https://gist.github.com/jgatjens/8925165

Then to use it just add the lines below

{% loop_directory directory:images iterator:image filter:*.jpg sort:descending %}
   <img src="https://stackoverflow.com/questions/17446472/{{ image }}" />
{% endloop_directory %}