add lsp-installer because its bette than before now!

lua/plugins/configs/lsp_installer.lua

@@ -0,0 +1,36 @@
+local present, lsp_installer = pcall(require, "nvim-lsp-installer")
+
+if not present then
+   return
+end
+
+local options = {
+   -- ensure_installed is not needed as automatic_installation is enabled
+   -- then any lsp server you setup by lspconfig is going to get installed automatically!
+
+   -- ensure_installed = { "lua" },
+   automatic_installation = true,
+
+   ui = {
+      icons = {
+         server_installed = "",
+         server_pending = "",
+         server_uninstalled = "ﮊ",
+      },
+      keymaps = {
+         toggle_server_expand = "<CR>",
+         install_server = "i",
+         update_server = "u",
+         check_server_version = "c",
+         update_all_servers = "U",
+         check_outdated_servers = "C",
+         uninstall_server = "X",
+      },
+   },
+
+   max_concurrent_installers = 20,
+}
+
+options = require("core.utils").load_override(options, "williamboman/nvim-lsp-installer")
+
+lsp_installer.setup(options)

lua/plugins/configs/lspconfig.lua

@@ -1,3 +1,9 @@
+local present, lspconfig = pcall(require, "lspconfig")
+
+if not present then
+   return
+end
+
 local M = {}
 
 require("plugins.configs.others").lsp_handlers()
@@ -26,6 +32,27 @@ capabilities.textDocument.completion.completionItem.resolveSupport = {
    },
 }
 
+lspconfig.sumneko_lua.setup {
+   on_attach = M.on_attach,
+   capabilities = capabilities,
+
+   settings = {
+      Lua = {
+         diagnostics = {
+            globals = { "vim" },
+         },
+         workspace = {
+            library = {
+               [vim.fn.expand "$VIMRUNTIME/lua"] = true,
+               [vim.fn.expand "$VIMRUNTIME/lua/vim/lsp"] = true,
+            },
+            maxPreload = 100000,
+            preloadFileSize = 10000,
+         },
+      },
+   },
+}
+
 -- requires a file containing user's lspconfigs
 local addlsp_confs = require("core.utils").load_config().plugins.options.lspconfig.setup_lspconf