Sample custom LSP setup in lua?

[Chocrates]

Does anyone know how to setup a language server in a non default way?

I am trying to use elmls and it is failing to find the language server

I think I basically need to set the elmPath setting during server setup, but I can't seem to get it to work.
This is what I have in my lsp.lua file that does my lsp config:

Relevant bit is:

require('mason-lspconfig').setup_handlers({
    require('lspconfig')['elmls'].setup({
        elmPath = "notreal"
    })
})

And the full file

local lsp = require("lsp-zero")

lsp.preset("recommended")

lsp.ensure_installed({
    'tsserver',
    'eslint',
    'rust_analyzer',
    'elmls'
})

-- Fix Undefined global 'vim'
lsp.nvim_workspace()


require('mason-lspconfig').setup_handlers({
    require('lspconfig')['elmls'].setup({
        elmPath = "notreal"
    })
})



local cmp = require('cmp')
local cmp_select = { behavior = cmp.SelectBehavior.Select }
local cmp_mappings = lsp.defaults.cmp_mappings({
    ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
    ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
    ['<C-y>'] = cmp.mapping.confirm({ select = true }),
    ["<C-Space>"] = cmp.mapping.complete(),
})

-- cmp_mappings['<Tab>'] = nil -- Might be breaking copilot
cmp_mappings['<S-Tab>'] = nil

lsp.setup_nvim_cmp({
    mapping = cmp_mappings
})

lsp.set_preferences({
    -- suggest_lsp_servers = false,
    sign_icons = {
        error = 'E',
        warn = 'W',
        hint = 'H',
        info = 'I'
    }
})

lsp.on_attach(function(client, bufnr)
    local opts = { buffer = bufnr, remap = false }

    vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
    vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
    vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
    vim.keymap.set("n", "<leader>vd", function() vim.diagnostic.open_float() end, opts)
    vim.keymap.set("n", "[d", function() vim.diagnostic.goto_next() end, opts)
    vim.keymap.set("n", "]d", function() vim.diagnostic.goto_prev() end, opts)
    vim.keymap.set("n", "<leader>vca", function() vim.lsp.buf.code_action() end, opts)
    vim.keymap.set("n", "<leader>vrr", function() vim.lsp.buf.references() end, opts)
    vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
    vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, opts)
end)

lsp.setup()

vim.diagnostic.config({
    virtual_text = true
})

[VonHeikemen]

I think that option belongs in the "settings" property.

And there is no need to add mason-lspconfig in the config. Just call lspconfig.

require('lspconfig')['elmls'].setup({
  settings = {
    elmLS = {
      elmPath = "notreal"
    }
  }
})

So this settings property is where you add the options that are specific to the language server.

[Chocrates]

thanks! This is super helpful.

Didn't fix my issue but I think it is a bug with the lsp implementation and not something I can fix in config.