This is a Jekyll plugin to evaluate Ruby code in the frontmatter.
If you want to use it, copy the Ruby file into your _plugins folder.
The plugin will find and execute all code in frontmatter values matching the regex eval(<code>).
For example
---
date: 'eval(site.time.strftime("%Y-%m-%d %H:%M:%S"))'
---will render the current time when building.
You can access everything from Ruby, the current page, the entire site etc..