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I wish Smithay was actually in Rust and not a wrapper for the C libraries, though.

Playing with client-side Wayland programming, wayrs is a lot nicer to deal with than the C library wrappers.

There are more. Jay, cosmic and even xfce is writing their new compositor in Rust.

Also Pinnacle

https://github.com/pinnacle-comp/pinnacle

The majority of the projects in this comment chain don't actually independently implement a compositor in Rust - which is a good thing IMHO. Cosmic and Pinaccle at least come from a common core written in rust that is associated with the cosmic project: https://github.com/Smithay/smithay/

niri also uses smithay. jay is its own thing.

I haven't checked the repo but just carefully use unsafe as an escape hatch when needed and Rust gets out of your way. Sure you give away some of the guarantees that some people get cultish about but you get to tap into a beautiful ecosystem and reap the benefits.