Support Rust Codegen

[huwaireb]

Describe the use-case for this feature

Rust is the choice of many editors e.g Helix, Zed, LSPs e.g rust-analyzer and build systems e.g buck2.

What do you propose

Offer a bsp4rs crate.
I'd be happy to contribute an implementation, as I need it for a project of mine.

I've checked to make sure there isn't already a way to support this in the current protocol

• I've checked the existing protocol and there isn't a way to do this currently

Maintainer approval (This is for the maintainers)

• Jetbrains
• Metals
• Scala Center

[616b2f]

@huwaireb there is already some effort done here:

https://github.com/cargo-bsp/cargo-bsp

it's currently not published as a crate, but should be easily done, you may try to propose it there.

[huwaireb]

@huwaireb there is already some effort done here:

cargo-bsp/cargo-bsp

it's currently not published as a crate, but should be easily done, you may try to propose it there.

I'm aware of that implementation, among others. However none seem to be maintained? cargo-bsp hasn't seen activity for 9 months, and doesn't seem to be using smithy for codegen either?

edit:

Looks like their codegen was located elsewhere, using the current method of codegen:

https://github.com/agluszak/bsp-generators/tree/main/codegen/src/main/kotlin/org/jetbrains/bsp/generators/bsp4rs.

In light of this, @agluszak curious how can we proceed here.
Is it possible to adapt and merge into upstream. Alongside publishing a crate?