[feature request] switch language server for different projects

[h-michael]

First of all, thank you for developing great tool!

Is your feature request related to a problem? Please describe.

We can use only one language server with each filetype.

Describe the solution you'd like

Sometimes, one language has some language servers or running server options. For example, we can run rls aka rust language server with both rustup run stable rls and rustup run nightly rls and more.. . I want to switch to other lsp depending on project.

Describe alternatives you've considered

Now I write vimscript like this.

  function! SwitchStableRls() abort
    if (&ft=='rust')
      LanguageClientStop
      sleep 100m
      let g:LanguageClient_serverCommands.rust = ['rustup', 'run', 'stable', 'rls']
      LanguageClientStart
    endif
  endfunction

  function! SwitchNightlyRls() abort
    if (&ft=='rust')
      LanguageClientStop
      sleep 100m
      let g:LanguageClient_serverCommands.rust = ['rustup', 'run', 'nightly', 'rls']
      LanguageClientStart
    endif
  endfunction

Would we add more generic API than above script?

[rfletchr]

why not simply use exrc?

simply put a .vimrc / .nvimrc file in your project root and put the specific config in there.

that or define your rustup mode in an environment variable

let g:LanguageClient_serverCommands.rust = ['rustup', 'run', $RUSTUP_MODE, 'rls']

this is how i handle my various pyls configs.