This plugin adds a :static_id variable into the Jekyll permalink configuration that allows authors to create evergreen permalinks.
NOTE: This plugin also requires server level configuration to redirect requests properly.
Move hashpermalink.rb into the _plugins folder at the root of your Jekyll project, and update the permalink key in the _config.yml file to include :static_id (e.g. permalink: '/:categories/:title-:static_id').
Then configure your server to serve the correct content for these requests. For example, when using Apache, the .htaccess file may include:
RewriteCond %{REQUEST_URI} -([^-]*)$
RewriteRule ^ %1/index.html