Jekyll custom permalink

This Jekyll plugin allows you to use custom Front Matter in the permalink setting of collections.

Add the plugin to your site's Gemfile:

group :jekyll_plugins do
  # your other jekyll plugins...
  gem 'jekyll_custom_permalink', '~> 0.0'
end

Then run

$ bundle install

Lets assume that you have some options for your collection "projects" defined in _config:

collections:
  projects:
    output: true
    permalink: projects/:title/

You would like to use custom Front Matter in the paths of your projects. For example, it would be great to be able to include the Front Matter variable type in the links to your projects, which is defined in every file belonging to the "projects" collection.

---
layout: page
type: python
title: MyAwesomeProject
---
Some content

You can use the type variable in your permalink by first adding it to an array of custom permalink placeholders for the collection, and then adding the placeholder to the permalink setting prefixed with a : like every other Jekyll placeholder.

collections:
  projects:
    output: true
    custom_permalink_placeholders: ["type"]
    permalink: projects/:type/:title/

These settings lead to the "project" page, shown above, to be live at /projects/python/MyAwesomeProject.

If the variable is not defined, it is ignored for the permalink. Meaning projects/:type/:title/ will be like projects/:title/ for a document without type set in its Front Matter. This is the same behaviour as for the default Jekyll placeholders.