Emacs auto-complete-mode at startup

Question

I think you can do it in various ways. To enable it globally you should use

(global-auto-complete-mode t)

But it uses auto-complete-mode-maybe, which turn AC on only those listed in ac-modes. You can add them manually just like this

(add-to-list 'ac-modes 'sql-mode)

You can make your own list if you wish AC be active only for few modes

(setq ac-modes '(c++-mode sql-mode))

Or rewrite it to have AC everywhere.

(defun auto-complete-mode-maybe ()
  "No maybe for you. Only AC!"
  (auto-complete-mode 1))

edited:

Autocomplete in minibuffer is bad. I think this will be better.

(defun auto-complete-mode-maybe ()
  "No maybe for you. Only AC!"
  (unless (minibufferp (current-buffer))
    (auto-complete-mode 1)))