add nix ftplugin

init.lua

@@ -11,6 +11,8 @@ vim.cmd("set cursorline")
 vim.cmd("set mouse=a")
 vim.cmd("set clipboard+=unnamedplus")
 
+vim.o.exrc = true
+
 vim.g.python3_host_prog = 'python3.13'
 
 vim.api.nvim_set_hl(0, "Normal", { bg = "#040404" })
@@ -26,7 +28,7 @@ vim.diagnostic.config({
 
 vim.api.nvim_create_autocmd({ "BufEnter", "CursorHold", "InsertLeave" }, {
     callback = function()
-        pcall(vim.lsp.codelens.refresh)
+        pcall(function(bufnr) vim.lsp.codelens.enable(true, { bufnr = bufnr }) end)
     end,
 })