lisp/mail/unrmail.el

   1 ;;; unrmail.el --- convert Rmail files to mailbox files
   2
   3 ;; Copyright (C) 1992, 2001, 2002, 2003, 2004, 2005,
   4 ;;   2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: mail
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 (defvar command-line-args-left) ;Avoid 'free variable' warning
  31
  32 ;;;###autoload
  33 (defun batch-unrmail ()
  34   "Convert Rmail files to system inbox format.
  35 Specify the input Rmail file names as command line arguments.
  36 For each Rmail file, the corresponding output file name
  37 is made by adding `.mail' at the end.
  38 For example, invoke `emacs -batch -f batch-unrmail RMAIL'."
  39   ;; command-line-args-left is what is left of the command line (from startup.el)
  40   (if (not noninteractive)
  41       (error "`batch-unrmail' is to be used only with -batch"))
  42   (let ((error nil))
  43     (while command-line-args-left
  44       (or (unrmail (car command-line-args-left)
  45                    (concat (car command-line-args-left) ".mail"))
  46           (setq error t))
  47       (setq command-line-args-left (cdr command-line-args-left)))
  48     (message "Done")
  49     (kill-emacs (if error 1 0))))
  50
  51 (declare-function mail-strip-quoted-names "mail-utils" (address))
  52
  53 ;;;###autoload
  54 (defun unrmail (file to-file)
  55   "Convert Rmail file FILE to system inbox format file TO-FILE."
  56   (interactive "fUnrmail (rmail file): \nFUnrmail into (new mailbox file): ")
  57   (with-temp-buffer
  58     ;; Read in the old Rmail file with no decoding.
  59     (let ((coding-system-for-read 'raw-text))
  60       (insert-file-contents file))
  61     ;; But make it multibyte.
  62     (set-buffer-multibyte t)
  63
  64     (if (not (looking-at "BABYL OPTIONS"))
  65         (error "This file is not in Babyl format"))
  66
  67     ;; Decode the file contents just as Rmail did.
  68     (let ((modifiedp (buffer-modified-p))
  69           (coding-system rmail-file-coding-system)
  70           from to)
  71       (goto-char (point-min))
  72       (search-forward "\n\^_" nil t)    ; Skip BABYL header.
  73       (setq from (point))
  74       (goto-char (point-max))
  75       (search-backward "\n\^_" from 'mv)
  76       (setq to (point))
  77       (unless (and coding-system
  78                    (coding-system-p coding-system))
  79         (setq coding-system
  80               ;; Emacs 21.1 and later writes RMAIL files in emacs-mule, but
  81               ;; earlier versions did that with the current buffer's encoding.
  82               ;; So we want to favor detection of emacs-mule (whose normal
  83               ;; priority is quite low), but still allow detection of other
  84               ;; encodings if emacs-mule won't fit.  The call to
  85               ;; detect-coding-with-priority below achieves that.
  86               (car (detect-coding-with-priority
  87                     from to
  88                     '((coding-category-emacs-mule . emacs-mule))))))
  89       (unless (memq coding-system
  90                     '(undecided undecided-unix))
  91         (set-buffer-modified-p t)       ; avoid locking when decoding
  92         (let ((buffer-undo-list t))
  93           (decode-coding-region from to coding-system))
  94         (setq coding-system last-coding-system-used))
  95
  96       (setq buffer-file-coding-system nil)
  97
  98       ;; We currently don't use this value, but maybe we should.
  99       (setq save-buffer-coding-system
 100             (or coding-system 'undecided)))
 101
 102     ;; Default the directory of TO-FILE based on where FILE is.
 103     (setq to-file (expand-file-name to-file default-directory))
 104     (condition-case ()
 105         (delete-file to-file)
 106       (file-error nil))
 107     (message "Writing messages to %s..." to-file)
 108     (goto-char (point-min))
 109
 110     (let ((temp-buffer (get-buffer-create " unrmail"))
 111           (from-buffer (current-buffer)))
 112
 113       ;; Process the messages one by one.
 114       (while (search-forward "\^_\^l" nil t)
 115         (let ((beg (point))
 116               (end (save-excursion
 117                      (if (search-forward "\^_" nil t)
 118                          (1- (point)) (point-max))))
 119               (coding 'raw-text)
 120               label-line attrs keywords
 121               mail-from reformatted)
 122           (with-current-buffer temp-buffer
 123             (setq buffer-undo-list t)
 124             (erase-buffer)
 125             (setq buffer-file-coding-system coding)
 126             (insert-buffer-substring from-buffer beg end)
 127             (goto-char (point-min))
 128             (forward-line 1)
 129             ;; Record whether the header is reformatted.
 130             (setq reformatted (= (following-char) ?1))
 131
 132             ;; Collect the label line, then get the attributes
 133             ;; and the keywords from it.
 134             (setq label-line
 135                   (buffer-substring (point)
 136                                     (save-excursion (forward-line 1)
 137                                                     (point))))
 138             (search-forward ",,")
 139             (unless (eolp)
 140               (setq keywords
 141                     (buffer-substring (point)
 142                                       (progn (end-of-line)
 143                                              (1- (point)))))
 144               (setq keywords
 145                     (replace-regexp-in-string ", " "," keywords)))
 146
 147             (setq attrs
 148                   (list
 149                    (if (string-match ", answered," label-line) ?A ?-)
 150                    (if (string-match ", deleted," label-line) ?D ?-)
 151                    (if (string-match ", edited," label-line) ?E ?-)
 152                    (if (string-match ", filed," label-line) ?F ?-)
 153                    (if (string-match ", resent," label-line) ?R ?-)
 154                    (if (string-match ", unseen," label-line) ?\  ?-)
 155                    (if (string-match ", stored," label-line) ?S ?-)))
 156
 157             ;; Delete the special Babyl lines at the start,
 158             ;; and the ***EOOH*** line, and the reformatted header if any.
 159             (goto-char (point-min))
 160             (if reformatted
 161                 (progn
 162                   (forward-line 2)
 163                   ;; Delete Summary-Line headers.
 164                   (let ((case-fold-search t))
 165                     (while (looking-at "Summary-Line:")
 166                       (forward-line 1)))
 167                   (delete-region (point-min) (point))
 168                   ;; Delete the old reformatted header.
 169                   (re-search-forward "^[*][*][*] EOOH [*][*][*]\n")
 170                   (forward-line -1)
 171                   (let ((start (point)))
 172                     (search-forward "\n\n")
 173                     (delete-region start (point))))
 174               ;; Not reformatted.  Delete the special
 175               ;; lines before the real header.
 176               (re-search-forward "^[*][*][*] EOOH [*][*][*]\n")
 177               (delete-region (point-min) (point)))
 178
 179             ;; Some operations on the message header itself.
 180             (goto-char (point-min))
 181             (save-restriction
 182               (narrow-to-region
 183                (point-min)
 184                (save-excursion (search-forward "\n\n" nil 'move) (point)))
 185
 186               ;; Fetch or construct what we should use in the `From ' line.
 187               (setq mail-from
 188                     (or (mail-fetch-field "Mail-From")
 189                         (concat "From "
 190                                 (mail-strip-quoted-names (or (mail-fetch-field "from")
 191                                                              (mail-fetch-field "really-from")
 192                                                              (mail-fetch-field "sender")
 193                                                              "unknown"))
 194                                 " " (current-time-string))))
 195
 196               ;; If the message specifies a coding system, use it.
 197               (let ((maybe-coding (mail-fetch-field "X-Coding-System")))
 198                 (if maybe-coding
 199                     (setq coding (intern maybe-coding))))
 200
 201               ;; Delete the Mail-From: header field if any.
 202               (when (re-search-forward "^Mail-from:" nil t)
 203                 (beginning-of-line)
 204                 (delete-region (point)
 205                                (progn (forward-line 1) (point)))))
 206
 207             (goto-char (point-min))
 208             ;; Insert the `From ' line.
 209             (insert mail-from "\n")
 210             ;; Record the keywords and attributes in our special way.
 211             (insert "X-BABYL-V6-ATTRIBUTES: " (apply 'string attrs) "\n")
 212             (when keywords
 213               (insert "X-BABYL-V6-KEYWORDS: " keywords "\n"))
 214             (goto-char (point-min))
 215             ;; ``Quote'' "\nFrom " as "\n>From "
 216             ;;  (note that this isn't really quoting, as there is no requirement
 217             ;;   that "\n[>]+From " be quoted in the same transparent way.)
 218             (let ((case-fold-search nil))
 219               (while (search-forward "\nFrom " nil t)
 220                 (forward-char -5)
 221                 (insert ?>)))
 222             ;; Write it to the output file.
 223             (write-region (point-min) (point-max) to-file t
 224                           'nomsg))))
 225       (kill-buffer temp-buffer))
 226     (message "Writing messages to %s...done" to-file)))
 227
 228 (provide 'unrmail)
 229
 230 ;;; unrmail.el ends here
 231
 232 ;;; arch-tag: 14c6290d-60b2-456f-8909-5c2387de6acb