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;;; unrmail.el --- convert Rmail files to mailbox files
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;; Copyright (C) 1992, 2001, 2002, 2003, 2004, 2005,
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;;   2006, 2007 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: mail

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;; 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
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;; the Free Software Foundation; either version 3, or (at your option)
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;; 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
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;; along with GNU Emacs; see the file COPYING.  If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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;;; Commentary:

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;;; Code:

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(defvar command-line-args-left)	;Avoid 'free variable' warning

;;;###autoload
(defun batch-unrmail ()
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  "Convert Rmail files to system inbox format.
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Specify the input Rmail file names as command line arguments.
For each Rmail file, the corresponding output file name
is made by adding `.mail' at the end.
For example, invoke `emacs -batch -f batch-unrmail RMAIL'."
  ;; command-line-args-left is what is left of the command line (from startup.el)
  (if (not noninteractive)
      (error "`batch-unrmail' is to be used only with -batch"))
  (let ((error nil))
    (while command-line-args-left
      (or (unrmail (car command-line-args-left)
		   (concat (car command-line-args-left) ".mail"))
	  (setq error t))
      (setq command-line-args-left (cdr command-line-args-left)))
    (message "Done")
    (kill-emacs (if error 1 0))))

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(declare-function mail-strip-quoted-names "mail-utils" (address))

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;;;###autoload
(defun unrmail (file to-file)
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  "Convert Rmail file FILE to system inbox format file TO-FILE."
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  (interactive "fUnrmail (rmail file): \nFUnrmail into (new mailbox file): ")
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  (with-temp-buffer
    ;; Read in the old Rmail file with no decoding.
    (let ((coding-system-for-read 'raw-text))
      (insert-file-contents file))
    ;; But make it multibyte.
    (set-buffer-multibyte t)

    (if (not (looking-at "BABYL OPTIONS"))
	(error "This file is not in Babyl format"))

    ;; Decode the file contents just as Rmail did.
    (let ((modifiedp (buffer-modified-p))
	  (coding-system rmail-file-coding-system)
	  from to)
      (goto-char (point-min))
      (search-forward "\n\^_" nil t)	; Skip BABYL header.
      (setq from (point))
      (goto-char (point-max))
      (search-backward "\n\^_" from 'mv)
      (setq to (point))
      (unless (and coding-system
		   (coding-system-p coding-system))
	(setq coding-system
	      ;; Emacs 21.1 and later writes RMAIL files in emacs-mule, but
	      ;; earlier versions did that with the current buffer's encoding.
	      ;; So we want to favor detection of emacs-mule (whose normal
	      ;; priority is quite low), but still allow detection of other
	      ;; encodings if emacs-mule won't fit.  The call to
	      ;; detect-coding-with-priority below achieves that.
	      (car (detect-coding-with-priority
		    from to
		    '((coding-category-emacs-mule . emacs-mule))))))
      (unless (memq coding-system
		    '(undecided undecided-unix))
	(set-buffer-modified-p t)	; avoid locking when decoding
	(let ((buffer-undo-list t))
	  (decode-coding-region from to coding-system))
	(setq coding-system last-coding-system-used))

      (setq buffer-file-coding-system nil)

      ;; We currently don't use this value, but maybe we should.
      (setq save-buffer-coding-system
	    (or coding-system 'undecided)))

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    ;; Default the directory of TO-FILE based on where FILE is.
    (setq to-file (expand-file-name to-file default-directory))
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    (condition-case ()
	(delete-file to-file)
      (file-error nil))
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    (message "Writing messages to %s..." to-file)
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    (goto-char (point-min))

    (let ((temp-buffer (get-buffer-create " unrmail"))
	  (from-buffer (current-buffer)))

      ;; Process the messages one by one.
      (while (search-forward "\^_\^l" nil t)
	(let ((beg (point))
	      (end (save-excursion
		     (if (search-forward "\^_" nil t)
			 (1- (point)) (point-max))))
	      (coding 'raw-text)
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	      label-line attrs keywords
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	      mail-from reformatted)
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	  (with-current-buffer temp-buffer
	    (setq buffer-undo-list t)
	    (erase-buffer)
	    (setq buffer-file-coding-system coding)
	    (insert-buffer-substring from-buffer beg end)
	    (goto-char (point-min))
	    (forward-line 1)
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	    ;; Record whether the header is reformatted.
	    (setq reformatted (= (following-char) ?1))

	    ;; Collect the label line, then get the attributes
	    ;; and the keywords from it.
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	    (setq label-line
		  (buffer-substring (point)
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				    (save-excursion (forward-line 1)
						    (point))))
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	    (search-forward ",,")
	    (unless (eolp)
	      (setq keywords
		    (buffer-substring (point)
				      (progn (end-of-line)
					     (1- (point)))))
	      (setq keywords
		    (replace-regexp-in-string ", " "," keywords)))

	    (setq attrs
		  (list
		   (if (string-match ", answered," label-line) ?A ?-)
		   (if (string-match ", deleted," label-line) ?D ?-)
		   (if (string-match ", edited," label-line) ?E ?-)
		   (if (string-match ", filed," label-line) ?F ?-)
		   (if (string-match ", resent," label-line) ?R ?-)
		   (if (string-match ", unseen," label-line) ?\  ?-)
		   (if (string-match ", stored," label-line) ?S ?-)))
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	    ;; Delete the special Babyl lines at the start,
	    ;; and the ***EOOH*** line, and the reformatted header if any.
	    (goto-char (point-min))
	    (if reformatted
		(progn
		  (forward-line 2)
		  ;; Delete Summary-Line headers.
		  (let ((case-fold-search t))
		    (while (looking-at "Summary-Line:")
		      (forward-line 1)))
		  (delete-region (point-min) (point))
		  ;; Delete the old reformatted header.
		  (re-search-forward "^[*][*][*] EOOH [*][*][*]\n")
		  (forward-line -1)
		  (let ((start (point)))
		    (search-forward "\n\n")
		    (delete-region start (point))))
	      ;; Not reformatted.  Delete the special
	      ;; lines before the real header.
	      (re-search-forward "^[*][*][*] EOOH [*][*][*]\n")
	      (delete-region (point-min) (point)))

	    ;; Some operations on the message header itself.
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	    (goto-char (point-min))
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	    (save-restriction
	      (narrow-to-region 
	       (point-min)
	       (save-excursion (search-forward "\n\n" nil 'move) (point)))

	      ;; Fetch or construct what we should use in the `From ' line.
	      (setq mail-from
		    (or (mail-fetch-field "Mail-From")
			(concat "From "
				(mail-strip-quoted-names (or (mail-fetch-field "from")
							     (mail-fetch-field "really-from")
							     (mail-fetch-field "sender")
							     "unknown"))
				" " (current-time-string))))

	      ;; If the message specifies a coding system, use it.
	      (let ((maybe-coding (mail-fetch-field "X-Coding-System")))
		(if maybe-coding
		    (setq coding (intern maybe-coding))))

	      ;; Delete the Mail-From: header field if any.
	      (when (re-search-forward "^Mail-from:" nil t)
		(beginning-of-line)
		(delete-region (point)
			       (progn (forward-line 1) (point)))))

	    (goto-char (point-min))
	    ;; Insert the `From ' line.
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	    (insert mail-from "\n")
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	    ;; Record the keywords and attributes in our special way.
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	    (insert "X-BABYL-V6-ATTRIBUTES: " (apply 'string attrs) "\n")
	    (when keywords
	      (insert "X-BABYL-V6-KEYWORDS: " keywords "\n"))
	    (goto-char (point-min))
	    ;; ``Quote'' "\nFrom " as "\n>From "
	    ;;  (note that this isn't really quoting, as there is no requirement
	    ;;   that "\n[>]+From " be quoted in the same transparent way.)
	    (let ((case-fold-search nil))
	      (while (search-forward "\nFrom " nil t)
		(forward-char -5)
		(insert ?>)))
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	    ;; Write it to the output file.
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	    (write-region (point-min) (point-max) to-file t
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			  'nomsg))))
      (kill-buffer temp-buffer))
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    (message "Writing messages to %s...done" to-file)))
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(provide 'unrmail)

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;;; unrmail.el ends here
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;;; arch-tag: 14c6290d-60b2-456f-8909-5c2387de6acb