Support rust-analyzer

[nycex]

Add support for rust-analyzer

Name: rust-analyzer
URL: https://github.com/rust-analyzer/rust-analyzer

rust-analyzer is an experimental rust language server which is part of a rls 2.0 effort.

[cwndrws]

For anyone else who wants to use rust-analyzer with ale before that PR is merged, this is how I have my ftplugin/rust.vim to do it:

let b:ale_linters = ['rls']
let g:ale_rust_rls_executable = 'rust-analyzer'
let b:ale_fixers = ['rustfmt']

Because they both use the LSP interface, it works as a drop in replacement.

[kamek-pf]

@cwndrws did you manage to also get clippy working with this setup ?

[cwndrws]

@kamek-pf no, as far as I can tell, you can only use clippy if you use the cargo linter.

[elshize]

@cwndrws I got it working, but with executable rust-analyzer (maybe it changed in the meantime?)

[cwndrws]

@elshize Yeah it looks like they changed the name of the binary in this commit. I have updated the snippet in my comment.

[ghost]

Because they both use the LSP interface, it works as a drop in replacement.

Doesn't work for me. Does it work for you now?

[elshize]

@xliiv yeah, I've been using it for a week or so now. Here's my rust-related ALE config in .vimrc:

let g:ale_rust_rls_config = {
	\ 'rust': {
		\ 'all_targets': 1,
		\ 'build_on_save': 1,
		\ 'clippy_preference': 'on'
	\ }
	\ }
let g:ale_rust_rls_toolchain = ''
let g:ale_rust_rls_executable = 'rust-analyzer'
let g:ale_linters = {
    \ 'rust': ['rls']
    \ }
let g:ale_fixers = {
    \ 'rust': ['rustfmt']
    \ }

If you're not seeing any effects, I suggest running :ALEInfo and seeing what the logs say.

[ghost]

@elshize thanks it helps, not it's running.

it started working when i put this line

let g:ale_rust_rls_toolchain = ''

previously i had this one

let g:ale_rust_rls_toolchain="stable"

[elshize]

Does anyone know if it is possible to enable clippy for rust-analyzer? That option 'clippy_preference': 'on' that worked on rls doesn't seem to work anymore, at least I'm not getting any clippy warnings. Any ideas?

[cuviper]

There's now an RFC for Rust to officially transition from RLS to rust-analyzer: rust-lang/rfcs#2912

[sbromberger]

I can't seem to get rust-analyzer to lint properly on leaving insert mode. It takes about a second for an error to show up in the gutter, and then when I erase the offending line, the error doesn't disappear. It's not quite a replacement for rls because rls doesn't seem to have this problem.

Any ideas?