The API generated for objective-c categories is inconvenient and requires implementation knowledge about rust-bindgen HOT 1 OPEN

Change all categories into impl Foo instead.

This is not a bad idea. I've been tempted to try this. One thing I'd say is that this will result in a much bigger generated source. Take for example these uikit-sys bindings. It's been a while since I've generated them but IIRC, the generated rust was ~100k to ~300k lines of rust and took a few minutes to compile - it was all in one file and I don't think that can be parallelized. Admittedly, it also generates all the stuff for Foundation. The CIImageProvider category of NSObject for example has a lot of implementers.

Anyway, I commend you for looking into the realm of rust objective-c. Generating ergonomic and reasonable bindings from objective-c headers is pretty hard. The objc2 crate is pushing forward on generating ergonomic bindings for apple frameworks in the icrate crate.

from rust-bindgen.