neovim/plugins/lsp/lspconfig.lua

local lsp_config = require("lspconfig")
local saga = require("lspsaga")

-- See: https://github.com/glepnir/lspsaga.nvim#configuration
saga.init_lsp_saga({
	code_action_lightbulb = { enable = false },
	symbol_in_winbar = { enable = false },
})

-- always show signcolumns
vim.opt.signcolumn = "yes"

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(client, bufnr)
	local bufopts = { noremap = true, silent = true, buffer = bufnr }
	vim.keymap.set("n", "<localleader>n", "<Cmd>Lspsaga rename<CR>", bufopts)
	vim.keymap.set('n', '<localleader>rn', vim.lsp.buf.rename, bufopts)
end

-------------------------------------------------------------------------------
-- See: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
--

-- Override the default configuration to be applied to all servers
lsp_config.util.default_config = vim.tbl_extend("force", lsp_config.util.default_config, {
	on_attach = on_attach,
})

-- nix
lsp_config.nil_ls.setup({})