English word completion from words file by auto-complete.el

ac-words-dictionary-enable.el

  (defun ac-words-dictionary-enable ()
    "Add /usr/share/dict/words to `ac-dictionary-files' for this buffer."
    (make-local-variable 'ac-dictionary-files)
    (add-to-list 'ac-dictionary-files "/usr/share/dict/words" t)
    (add-to-list 'ac-sources 'ac-source-dictionary t))

  (dolist (hook '(magit-log-edit-mode-hook
                  git-commit-mode-hook log-edit-mode-hook
                  textile-mode-hook markdown-mode-hook gfm-mode-hook
                  org-mode-hook text-mode-hook))
    (add-hook hook 'ac-words-dictionary-enable))