usr/contrib/lib/emacs/lisp/undigest.el

;; "RMAIL" mail reader for Emacs.
;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 1, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;; note Interent RFP934

(defun undigestify-rmail-message ()
  "Break up a digest message into its constituent messages.
Leaves original message, deleted, before the undigestified messages."
  (interactive)
  (widen)
  (let ((buffer-read-only nil)
        (msg-string (buffer-substring (rmail-msgbeg rmail-current-message)
                                      (rmail-msgend rmail-current-message))))
    (goto-char (rmail-msgend rmail-current-message))
    (narrow-to-region (point) (point))
    (insert msg-string)
    (narrow-to-region (point-min) (1- (point-max))))
  (let ((error t)
        (buffer-read-only nil))
    (unwind-protect
        (progn
          (save-restriction
            (goto-char (point-min))
            (delete-region (point-min)
                           (progn (search-forward "\n*** EOOH ***\n")
                                  (point)))
            (insert "\^_\^L\n0, unseen,,\n*** EOOH ***\n")
            (narrow-to-region (point)
                              (point-max))
            (let* ((fill-prefix "")
                   (case-fold-search t)
                   (digest-name
                    (mail-strip-quoted-names
                     (or (save-restriction
                           (search-forward "\n\n")
                           (narrow-to-region (point-min) (point))
                           (goto-char (point-max))
                           (or (mail-fetch-field "Reply-To")
                               (mail-fetch-field "To")
                               (mail-fetch-field "Apparently-To")))
                         (error "Message is not a digest")))))
              (save-excursion
                (goto-char (point-max))
                (skip-chars-backward " \t\n")
                (let ((count 10) found)
                  ;; compensate for broken un*x digestifiers.  Sigh Sigh.
                  (while (and (> count 0) (not found))
                    (forward-line -1)
                    (setq count (1- count))
                    (if (looking-at (concat "End of.*Digest.*\n"
                                            (regexp-quote "*********") "*"
                                            "\\(\n------*\\)*"))
                        (setq found t)))
                  (if (not found) (error "Message is not a digest"))))
              (re-search-forward (concat "^" (make-string 55 ?-) "-*\n*"))
              (replace-match "\^_\^L\n0, unseen,,\n*** EOOH ***\n")
              (save-restriction
                (narrow-to-region (point)
                                  (progn (search-forward "\n\n")
                                         (point)))
                (if (mail-fetch-field "To") nil
                  (goto-char (point-min))
                  (insert "To: " digest-name "\n")))
              (while (re-search-forward
                      (concat "\n\n" (make-string 27 ?-) "-*\n*")
                      nil t)
                (replace-match "\n\n\^_\^L\n0, unseen,,\n*** EOOH ***\n")
                (save-restriction
                  (if (looking-at "End ")
                      (insert "To: " digest-name "\n\n")
                    (narrow-to-region (point)
                                      (progn (search-forward "\n\n"
                                                             nil 'move)
                                             (point))))
                  (if (mail-fetch-field "To") nil
                    (goto-char (point-min))
                    (insert "To: " digest-name "\n"))))))
          (setq error nil)
          (message "Message successfully undigestified")
          (let ((n rmail-current-message))
            (rmail-forget-messages)
            (rmail-show-message n)
            (rmail-delete-forward)))
      (cond (error
             (narrow-to-region (point-min) (1+ (point-max)))
             (delete-region (point-min) (point-max))
             (rmail-show-message rmail-current-message))))))