add permanent undo (#197)

lua/options.lua

@@ -1,6 +1,7 @@
 local opt = vim.opt
 local g = vim.g
 
+opt.undofile = true
 opt.ruler = false
 opt.hidden = true
 opt.ignorecase = true
@@ -64,5 +65,10 @@ for _, plugin in pairs(disabled_built_ins) do
     vim.g["loaded_" .. plugin] = 1
 end
 
+-- Opening a file from its last left off position
+--vim.cmd(
+--   [[au BufReadPost * if expand('%:p') !~# '\m/\.git/' && line("'\"") > 1 && line("'\"") <= line("$") | exe "normal! g'\"" | endif]]
+--)
+
 -- file extension specific tabbing
 -- vim.cmd([[autocmd Filetype python setlocal expandtab tabstop=4 shiftwidth=4 softtabstop=4]])