SOFTWARE: signature randomizer for Emacs

;; Random signature selector
;; - selects signatures from one of two directories, overwrites ~/.sign=
ature

(defun selsig (which-sig)
  (setq real-buffer (current-buffer))
  (setq sig-buffer (find-file-noselect which-sig))
  (set-buffer sig-buffer)
  (write-file "~/.signature")
  (set-buffer real-buffer)
  (kill-buffer sig-buffer))

(defun randsig ()
  "Choose random signature to be used"
  (interactive)

  ; Directory is chosen by the distribution field
;;  (if (is-regexp-in-buf "^Distribution:.*world" "*post-news*")
  (if (call-buffer-searches-with-list sig-hillitty-regexps "*post-news*=
")
      (setq sig-directory sig-hillitty-directory)
    (setq sig-directory sig-estoton-directory))

  (if (file-directory-p sig-directory)
      ()
    (error (concat sig-directory " is not a directory")))

  ; All files that do not begin with a letter or number are eligible
  (setq sig-files (directory-files sig-directory t "^[a-zA-Z0-9]"))
  (setq sig-random (random))
  (if (< sig-random 0)
      (setq sig-random (- sig-random)))
  (setq sig-new
	(nth (% sig-random (length sig-files)) sig-files))

  ; It's nice to know which signature will be used
  (message "Current signature is %s" sig-new)
  (selsig sig-new))

;; Repeat regexp search in buffer for list
;; Return t if regexp found in buffer
(defun call-buffer-searches-with-list (list buffer)
  (if (is-regexp-in-buf (car list) buffer) t
    (if (not (cdr list)) nil
      (call-buffer-searches-with-list (cdr list) buffer))))

;; Do a regexp search for regexp in buffer buf
;; Return t if a match is found, else return nil

(defun is-regexp-in-buf (regexp buf)
  (interactive)
  (save-excursion
    (set-buffer buf)
    (goto-char (point-min))
    (if (re-search-forward regexp (point-max) t)
	t
      nil)))

;; Variables for signature selection

(setq sig-estoton-directory "~/.signatures1")
(setq sig-hillitty-directory "~/.signatures2")

(setq sig-hillitty-regexps '("^Distribution:.*koete"))


;; Select the new signature _before_ the article is sent
(setq news-inews-hook 'randsig)

;; EOF
--
`,`,`, |=AF=AF=AF| `,`,`, <Kim...@utu.fi> =B7 +358 40 500 295=
7 `,`,`,`,`,`,`,
`,`,`, |___| `,`,`, Studentbyn 84 A 10 =B7 FIN-20540 =C5bo =B7 Finland =
`,`,`,`,`,`,`,