If you've been following magit development, you may be aware that one of the goals of "the year of magit" is to implement Emacs bindings for libgit2, so that magit can avoid using git as a subprocess for every little thing. (There are a lot of little things.) This is the biggest performance bottleneck in magit.

The work-in-progress library is here: https://github.com/magit/libegit2

There are about 700 functions in libgit2 (list), most of those are up for grabs and any help in getting these implemented would be appreciated. The readme has instructions for how to get set up and how to go about implementing them. Since it's written in C, some knowledge of C is handy, but if you're a beginner don't fret. It's pretty formulaic work and I've implemented about 50 functions already, there should be some prior art for you to follow.

• More discussion here

I think some categories should take priority, probably branch, checkout, commit, diff, object, reference, repository, revparse, tag. I've done most of reference and repository myself.