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320 lines
11 KiB
EmacsLisp
320 lines
11 KiB
EmacsLisp
;;; undigest.el --- digest-cracking support for the RMAIL mail reader
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;; Copyright (C) 1985, 1986, 1994, 1996, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007, 2008, 2009 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.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; See Internet RFC 934 and RFC 1153
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;; Also limited support for MIME digest encapsulation
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;;; Code:
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(require 'rmail)
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(defconst rmail-mail-separator
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"\^_\^L\n0, unseen,,\n*** EOOH ***\n"
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"String for separating messages in an rmail file.")
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(defcustom rmail-forward-separator-regex
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"^----.*\\([Ff]orwarded\\|[Oo]riginal\\).*[Mm]essage"
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"*Regexp to match the string that introduces forwarded messages.
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This is not a header, but a string contained in the body of the message.
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You may need to customize it for local needs."
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:type 'regexp
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:group 'rmail-headers)
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(defconst rmail-digest-methods
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'(rmail-digest-parse-mime
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rmail-digest-parse-rfc1153strict
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rmail-digest-parse-rfc1153sloppy
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rmail-digest-parse-rfc934)
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"List of digest parsing functions, first tried first.
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These functions operate on the current narrowing, and take no argument.
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A function returns nil if it cannot parse the digest. If it can, it
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returns a list of cons pairs containing the start and end positions of
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each undigestified message as markers.")
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(defun rmail-digest-parse-mime ()
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(goto-char (point-min))
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(when (let ((head-end (progn (search-forward "\n\n" nil t) (point))))
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(goto-char (point-min))
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(and head-end
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(re-search-forward
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(concat
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"^Content-type: multipart/digest;"
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"\\s-* boundary=\"?\\([^\";\n]+\\)[\";\n]") head-end t)
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(search-forward (match-string 1) nil t)))
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;; Ok, prolog separator found
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(let ((start (make-marker))
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(end (make-marker))
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(separator (concat "\n--" (match-string 0) "\n\n"))
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result)
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(while (search-forward separator nil t)
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(move-marker start (match-beginning 0))
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(move-marker end (match-end 0))
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(add-to-list 'result (cons (copy-marker start) (copy-marker end t))))
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;; Return the list of marker pairs
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(nreverse result))))
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(defun rmail-digest-parse-rfc1153strict ()
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"Parse following strictly the method defined in RFC 1153.
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See rmail-digest-methods."
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(rmail-digest-rfc1153
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"^-\\{70\\}\n\n"
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"^\n-\\{30\\}\n\n"
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"^\n-\\{30\\}\n\nEnd of .* Digest.*\n\\*\\{15,\\}\n+\'"))
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(defun rmail-digest-parse-rfc1153sloppy ()
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"Parse using the method defined in RFC 1153, allowing for some sloppiness.
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See rmail-digest-methods."
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(rmail-digest-rfc1153
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"^-\\{55,\\}\n\n"
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"^\n-\\{27,\\}\n\n"
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;; GNU Mailman knowingly (see comment at line 353 of ToDigest.py in
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;; Mailman source) produces non-conformant rfc 1153 digests, in that
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;; the trailer contains a "digest footer" like this:
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;; _______________________________________________
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;; <one or more lines of list blurb>
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;;
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;; End of Foo Digest...
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;; **************************************
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"^\nEnd of"))
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(defun rmail-digest-rfc1153 (prolog-sep message-sep trailer-sep)
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(goto-char (point-min))
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(when (re-search-forward prolog-sep nil t)
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;; Ok, prolog separator found
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(let ((start (make-marker))
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(end (make-marker))
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separator result)
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(move-marker start (match-beginning 0))
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(move-marker end (match-end 0))
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(setq result (list (cons (copy-marker start) (copy-marker end t))))
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(when (re-search-forward message-sep nil t)
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;; Ok, at least one message separator found
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(setq separator (match-string 0))
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(when (re-search-forward trailer-sep nil t)
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;; Wonderful, we found a trailer, too. Now, go on splitting
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;; the digest into separate rmail messages
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(goto-char (cdar result))
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(while (search-forward separator nil t)
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(move-marker start (match-beginning 0))
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(move-marker end (match-end 0))
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(add-to-list 'result
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(cons (copy-marker start) (copy-marker end t))))
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;; Undo masking of separators inside digestified messages
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(goto-char (point-min))
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(while (search-forward
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(replace-regexp-in-string "\n-" "\n " separator) nil t)
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(replace-match separator))
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;; Return the list of marker pairs
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(nreverse result))))))
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(defun rmail-digest-parse-rfc934 ()
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(goto-char (point-min))
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(when (re-search-forward "^\n?-[^ ].*\n\n?" nil t)
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;; Message separator found
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(let ((start (make-marker))
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(end (make-marker))
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(separator (match-string 0))
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result)
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(goto-char (point-min))
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(while (search-forward separator nil t)
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(move-marker start (match-beginning 0))
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(move-marker end (match-end 0))
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(add-to-list 'result (cons (copy-marker start) (copy-marker end t))))
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;; Undo masking of separators inside digestified messages
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(goto-char (point-min))
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(while (search-forward "\n- -" nil t)
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(replace-match "\n-"))
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;; Return the list of marker pairs
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(nreverse result))))
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(declare-function rmail-update-summary "rmailsum" (&rest ignore))
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;;;###autoload
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(defun undigestify-rmail-message ()
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"Break up a digest message into its constituent messages.
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Leaves original message, deleted, before the undigestified messages."
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(interactive)
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(with-current-buffer rmail-buffer
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(widen)
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(let ((error t)
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(buffer-read-only nil))
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(goto-char (rmail-msgend rmail-current-message))
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(let ((msg-copy (buffer-substring (rmail-msgbeg rmail-current-message)
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(rmail-msgend rmail-current-message))))
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(narrow-to-region (point) (point))
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(insert msg-copy))
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(narrow-to-region (point-min) (1- (point-max)))
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(unwind-protect
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(progn
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(save-restriction
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(goto-char (point-min))
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(delete-region (point-min)
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(progn (search-forward "\n*** EOOH ***\n" nil t)
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(point)))
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(insert "\n" rmail-mail-separator)
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(narrow-to-region (point)
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(point-max))
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(let ((fill-prefix "")
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(case-fold-search t)
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digest-name type start end separator fun-list sep-list)
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(setq digest-name (mail-strip-quoted-names
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(save-restriction
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(search-forward "\n\n" nil 'move)
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(setq start (point))
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(narrow-to-region (point-min) start)
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(or (mail-fetch-field "Reply-To")
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(mail-fetch-field "To")
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(mail-fetch-field "Apparently-To")
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(mail-fetch-field "From")))))
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(unless digest-name
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(error "Message is not a digest--bad header"))
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(setq fun-list rmail-digest-methods)
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(while (and fun-list
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(null (setq sep-list (funcall (car fun-list)))))
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(setq fun-list (cdr fun-list)))
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(unless sep-list
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(error "Message is not a digest--no messages found"))
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;;; Split the digest into separate rmail messages
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(while sep-list
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(let ((start (caar sep-list))
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(end (cdar sep-list)))
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(delete-region start end)
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(goto-char start)
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(insert rmail-mail-separator)
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(search-forward "\n\n" (caar (cdr sep-list)) 'move)
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(save-restriction
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(narrow-to-region end (point))
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(unless (mail-fetch-field "To")
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(goto-char start)
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(insert "To: " digest-name "\n")))
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(set-marker start nil)
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(set-marker end nil))
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(setq sep-list (cdr sep-list)))))
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(setq error nil)
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(message "Message successfully undigestified")
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(let ((n rmail-current-message))
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(rmail-forget-messages)
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(rmail-show-message n)
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(rmail-delete-forward)
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(if (rmail-summary-exists)
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(rmail-select-summary
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(rmail-update-summary)))))
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(cond (error
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(narrow-to-region (point-min) (1+ (point-max)))
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(delete-region (point-min) (point-max))
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(rmail-show-message rmail-current-message)))))))
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;;;###autoload
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(defun unforward-rmail-message ()
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"Extract a forwarded message from the containing message.
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This puts the forwarded message into a separate rmail message
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following the containing message."
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(interactive)
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;; If we are in a summary buffer, switch to the Rmail buffer.
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(unwind-protect
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(with-current-buffer rmail-buffer
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(goto-char (point-min))
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(narrow-to-region (point)
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(save-excursion (search-forward "\n\n") (point)))
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(let ((buffer-read-only nil)
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(old-fwd-from (mail-fetch-field "Forwarded-From" nil nil t))
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(old-fwd-date (mail-fetch-field "Forwarded-Date" nil nil t))
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(fwd-from (mail-fetch-field "From"))
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(fwd-date (mail-fetch-field "Date"))
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beg end prefix forward-msg)
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(narrow-to-region (rmail-msgbeg rmail-current-message)
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(rmail-msgend rmail-current-message))
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(goto-char (point-min))
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(cond ((re-search-forward rmail-forward-separator-regex nil t)
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(forward-line 1)
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(skip-chars-forward "\n")
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(setq beg (point))
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(setq end (if (re-search-forward "^----.*[^- \t\n]" nil t)
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(match-beginning 0) (point-max)))
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(setq forward-msg
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(replace-regexp-in-string
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"^- -" "-" (buffer-substring beg end))))
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((and (re-search-forward "^\\(> ?\\)[a-zA-Z-]+: .*\n" nil t)
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(setq beg (match-beginning 0))
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(setq prefix (match-string-no-properties 1))
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(goto-char beg)
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(looking-at (concat "\\(" prefix ".+\n\\)*"
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prefix "Date: ."))
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(looking-at (concat "\\(" prefix ".+\n\\)*"
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prefix "From: .+\n"
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"\\(" prefix ".+\n\\)*"
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"\\(> ?\\)?\n" prefix)))
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(re-search-forward "^[^>\n]" nil 'move)
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(backward-char)
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(skip-chars-backward " \t\n")
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(forward-line 1)
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(setq end (point))
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(setq forward-msg
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(replace-regexp-in-string
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(if (string= prefix ">") "^>" "> ?")
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"" (buffer-substring beg end))))
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(t
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(error "No forwarded message found")))
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(widen)
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(goto-char (rmail-msgend rmail-current-message))
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(narrow-to-region (point) (point))
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(insert rmail-mail-separator)
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(narrow-to-region (point) (point))
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(while old-fwd-from
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(insert "Forwarded-From: " (car old-fwd-from) "\n")
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(insert "Forwarded-Date: " (car old-fwd-date) "\n")
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(setq old-fwd-from (cdr old-fwd-from))
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(setq old-fwd-date (cdr old-fwd-date)))
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(insert "Forwarded-From: " fwd-from "\n")
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(insert "Forwarded-Date: " fwd-date "\n")
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(insert forward-msg)
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(save-restriction
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(goto-char (point-min))
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(re-search-forward "\n$" nil 'move)
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(narrow-to-region (point-min) (point))
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(goto-char (point-min))
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(while (not (eobp))
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(unless (looking-at "^[a-zA-Z-]+: ")
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(insert "\t"))
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(forward-line)))
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(goto-char (point-min))))
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(let ((n rmail-current-message))
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(rmail-forget-messages)
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(rmail-show-message n))
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(if (rmail-summary-exists)
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(rmail-select-summary
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(rmail-update-summary)))))
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(provide 'undigest)
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;; arch-tag: 3a28b9fb-c1f5-43ef-9278-285f3e4b874d
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;;; undigest.el ends here
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