Vim: How to keep folds on save?

This behavior is normal. Vim’s default is not to remember which code you had folded vs. unfolded from one session to the next. You can save your current folds; when you finish editing a file, before exiting vim, enter the command :mkview. When you next open the file, if you enter :loadview, it will restore your folds. If you want this to happen automatically, add this code to your vimrc

augroup remember_folds
  autocmd!
  autocmd BufWinLeave * mkview
  autocmd BufWinEnter * silent! loadview
augroup END

If you want more features, this plugin does the same thing http://www.vim.org/scripts/script.php?script_id=4021.

Update: sorry, my original code didn’t work. It should work now.