nvim-config/lua/core/cmp_lsp/mason/config.lua

local map = vim.keymap.set
local api = vim.api
local lsp = vim.lsp

local lspconfig = require('lspconfig')

local bufopts = {
  noremap = true,
  silent = true,
  -- buffer=bufnr
}

local capabilities = require('cmp_nvim_lsp').default_capabilities(lsp.protocol.make_client_capabilities())

require("mason").setup({
  check_outdated_packages_on_open = true,

  registries = {
    "github:mason-org/mason-registry",
    "lua:mason-registry.index"
  },

  ui = {
    icons = {
      package_installed = "✓",
      package_pending = "➜",
      package_uninstalled = "✗"
    }
  }
})

require("mason-lspconfig").setup({
  ensure_installed = {
    'lua_ls',
    'editorconfig-checker',
  }
})

local on_attach = function(client, bufnr)
  -- Enable completion triggered by <c-x><c-o>
  api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

  map('n', '<leader>rn', '<cmd> lua vim.lsp.buf.rename()<CR>', bufopts)
  map('n', '<leader>qf', '<cmd> lua vim.lsp.buf.code_action()<CR>', bufopts)

  require("lsp-format").on_attach(client)
end

require("mason-lspconfig").setup_handlers({
  function(server_name)
    lspconfig[server_name].setup {
      on_attach = on_attach,
      capabilities = capabilities,
    }
  end,

  ['lua_ls'] = function()
    lspconfig.lua_ls.setup {
      on_attach = on_attach,
      capabilities = capabilities,
      settings = {
        Lua = {
          runtime = {
            -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
            version = 'LuaJIT',
          },
          diagnostics = {
            -- Get the language server to recognize the `vim` global
            globals = { 'vim' },
          },
          workspace = {
            -- Make the server aware of Neovim runtime files
            library = vim.api.nvim_get_runtime_file("", true),
          },
          -- Do not send telemetry data containing a randomized but unique identifier
          telemetry = {
            enable = false,
          },
        },
      },
    }
  end
})