After save hook for a mode

;; Add a hook for conf-mode[Space] to make sed scripts whenever I edit
;; and save /etc/hosts.
(add-hook 'conf-space-mode-hook
          (lambda ()
            (if (and (buffer-file-name) (string-match *hosts-file* (buffer-file-name)))
                (add-hook 'after-save-hook 'make-hosts-sedscripts nil t))))