[Question] Integration with Rustaceanvim

[pi314ever]

How do I integrate this with rustaceanvim? It has many more features that I would love to have that builds on top of rust analyzer, but I cannot figure out an interface between ra-multiplex and rustaceanvim.

I have tried ln -s ra-multiplex rust-analyzer to see if it can drop-in replace at least the client side, but it doesn't work due to differing APIs. Specifically, it complained that it could not use --log-file flag.

Any help on this would be greatly appreciated!

[EliteTK]

Having had a look at the rustaceanvim help (:help rustaceanvim.config I believe) there's a rustaceanvim configuration object which contains a settings object which can override cmd. It doesn't look like this can take the result of vim.lsp.rpc.connect() but you can try that first (as per the neovim example). If it doesn't work, set it to the path of "ra-multiplex".

While undocumented, rustaceanvim appears to also look for an init_options in the same place (as per https://github.com/mrcjkb/rustaceanvim/blob/29f42cc149f915d771c550b6dfe7c788d856cf04/lua/rustaceanvim/lsp/init.lua#L112 ).

Once you set those two things, it hopefully should work.

[pr2502]

I have tried ln -s ra-multiplex rust-analyzer to see if it can drop-in replace at least the client side, but it doesn't work due to differing APIs. Specifically, it complained that it could not use --log-file flag.

Another option for this approach would be to write a shell script instead of symlinking. Ignore the passed options and add --server-path option if you need to set it.

Something like /usr/local/bin/rust-analyzer:

#!/bin/bash
exec /path/to/ra-multiplex client --server-path /path/to/real/rust-analyzer

Then make sure that this shell script appears in PATH before the real rust-analyzer for your editor. You can use which rust-analyzer command in the same shell you'd spawn your editor from to see what it finds first.

[alepez]

With this configuration it works:

vim.g.rustaceanvim = {
  server = {
    cmd = function()
      return { "ra-multiplex" }
    end,

[mercxry]

Since rustaceanvim v5.20 there is auto-discovery for ra-multiplex if it's running in localhost with the default port and the server.cmd option is not set, so now you don't have to specify it anymore in the config and you have an automatic fallback to rust-analyzer if ra-multiplex is not running.