WIP: workspace/configuration

[schrieveslaach]

Description

Implement workspace/configuration protocol for LSP clients. See #10794 (follow up PR of #12454)

User-Facing Changes

LSP clients can provide include directories via the LSP client settings. For example, for Neovim via lspconfig for Nushell the include path configuration looks like this:

require('lspconfig').nushell.setup({
   settings = {
      nu = {
         includePaths = {
            "Path to include dir",
            -- …
         }
      }
   },
})

[fdncred]

@schrieveslaach Where are we at on this?

[schrieveslaach]

@fdncred, maybe, you can have a look from the user's point of view already.

Missing is the configuration changes. So, only static configuration are supported.

[fdncred]

I tried this in my neovim config and couldn't get it to work

        require('lspconfig').nushell.setup {
          cmd = { 'nu', '--lsp' },
          filetypes = { 'nu', 'nuon' },
          root_dir = require('lspconfig.util').find_git_ancestor,
          single_file_support = true,
          setting = {
            nu = {
              includePaths = {
                '/home/fdncred/test',
                '/home/fdncred/src/nu_scripts',
              },
            },
          },
        },

I put a file named ds.nu in /home/fdncred/test and did source ds.nu in a foo.nu file and it didn't like it. This is the file with the diagnostic plus the :LspInfo

The use line works because that path is in my $env.NU_LIB_DIRS, at least that's my guess.