Ever since I started learning LilyPond a little over three months ago, I started to write codes for handling contemporary notations, and I started to make a document cataloging them. I just wanted to share the link to the GitHub repository here, in the event it could be useful for anyone.
The document will be a work in progress. I would be grateful for feedback, as I know that some of these codes could be improved. I am also open to submitting some of them to LSR or elsewhere, but I can't quite tell as some of them are very elementary and similar examples abound on the internet.