List of all broken links

I'm finding Gitit very useful for storing and cross-referencing notes and details about my Dungeons and Dragons world. However, I've sprinkled the pages with links to pages that don't exist, for details I'm looking to flesh out later. Gitit doesn't render links to nonexistent pages differently from links to pages that do exist, so it's hard to spot them at a glance. What's more, I have some dozens of pages and would love a meta-wiki page that listed all of the broken links in the whole wiki, or in a directory.

I realize computing such a list would be a nontrivially expensive operation, but this wouldn't be an oft-accessed page anyway. Is such a feature something that might be pulled into Gitit? How difficult would it be to implement?