rmailout.el 8.86 KB
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;;; rmailout.el --- "RMAIL" mail reader for Emacs: output message to a file.

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;; Copyright (C) 1985, 1987, 1993 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 2, 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
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

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;;; Code:
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;; Temporary until Emacs always has this variable.
(defvar rmail-delete-after-output nil
  "*Non-nil means automatically delete a message that is copied to a file.")

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(defvar rmail-output-file-alist nil
  "*Alist matching regexps to suggested output Rmail files.
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This is a list of elements of the form (REGEXP . NAME-EXP).
NAME-EXP may be a string constant giving the file name to use,
or more generally it may be any kind of expression that returns
a file name as a string.")
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;;; There are functions elsewhere in Emacs that use this function; check
;;; them out before you change the calling method.
(defun rmail-output-to-rmail-file (file-name &optional count)
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  "Append the current message to an Rmail file named FILE-NAME.
If the file does not exist, ask if it should be created.
If file is being visited, the message is appended to the Emacs
buffer visiting that file.
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If the file exists and is not an Rmail file, 
the message is appended in inbox format.

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A prefix argument N says to output N consecutive messages
starting with the current one.  Deleted messages are skipped and don't count."
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  (interactive
   (let ((default-file
	   (let (answer tail)
	     (setq tail rmail-output-file-alist)
	     ;; Suggest a file based on a pattern match.
	     (while (and tail (not answer))
	       (save-excursion
		 (goto-char (point-min))
		 (if (re-search-forward (car (car tail)) nil t)
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		     (setq answer (eval (cdr (car tail)))))
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		 (setq tail (cdr tail))))
	     ;; If not suggestions, use same file as last time.
	     (or answer rmail-last-rmail-file))))
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     (list (setq rmail-last-rmail-file
		 (read-file-name
			    (concat "Output message to Rmail file: (default "
				    (file-name-nondirectory default-file)
				    ") ")
			    (file-name-directory default-file)
			    default-file))
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	   (prefix-numeric-value current-prefix-arg))))
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  (or count (setq count 1))
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  (setq file-name
	(expand-file-name file-name
			  (file-name-directory rmail-last-rmail-file)))
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  (if (and (file-readable-p file-name) (not (rmail-file-p file-name)))
      (rmail-output file-name count)
    (rmail-maybe-set-message-counters)
    (setq file-name (abbreviate-file-name file-name))
    (or (get-file-buffer file-name)
	(file-exists-p file-name)
	(if (yes-or-no-p
	     (concat "\"" file-name "\" does not exist, create it? "))
	    (let ((file-buffer (create-file-buffer file-name)))
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	      (save-excursion
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		(set-buffer file-buffer)
		(rmail-insert-rmail-file-header)
		(let ((require-final-newline nil))
		  (write-region (point-min) (point-max) file-name t 1)))
	      (kill-buffer file-buffer))
	  (error "Output file does not exist")))
    (while (> count 0)
      (let (redelete)
	(unwind-protect
	    (progn
	      (save-restriction
		(widen)
		(if (rmail-message-deleted-p rmail-current-message)
		    (progn (setq redelete t)
			   (rmail-set-attribute "deleted" nil)))
		;; Decide whether to append to a file or to an Emacs buffer.
		(save-excursion
		  (let ((buf (get-file-buffer file-name))
			(cur (current-buffer))
			(beg (1+ (rmail-msgbeg rmail-current-message)))
			(end (1+ (rmail-msgend rmail-current-message))))
		    (if (not buf)
			(append-to-file beg end file-name)
		      (if (eq buf (current-buffer))
			  (error "Can't output message to same file it's already in"))
		      ;; File has been visited, in buffer BUF.
		      (set-buffer buf)
		      (let ((buffer-read-only nil)
			    (msg (and (boundp 'rmail-current-message)
				      rmail-current-message)))
			;; If MSG is non-nil, buffer is in RMAIL mode.
			(if msg
			    (progn
			      (rmail-maybe-set-message-counters)
			      (widen)
			      (narrow-to-region (point-max) (point-max))
			      (insert-buffer-substring cur beg end)
			      (goto-char (point-min))
			      (widen)
			      (search-backward "\n\^_")
			      (narrow-to-region (point) (point-max))
			      (rmail-count-new-messages t)
			      (rmail-show-message msg))
		;; Output file not in rmail mode => just insert at the end.
		(narrow-to-region (point-min) (1+ (buffer-size)))
		(goto-char (point-max))
		(insert-buffer-substring cur beg end)))))))
	      (rmail-set-attribute "filed" t))
	  (if redelete (rmail-set-attribute "deleted" t))))
      (setq count (1- count))
      (if rmail-delete-after-output
	  (rmail-delete-forward)
	(if (> count 0)
	    (rmail-next-undeleted-message 1))))))

;; Returns t if file FILE is an Rmail file.
(defun rmail-file-p (file)
  (let ((buf (generate-new-buffer " *rmail-file-p*")))
    (unwind-protect
	(save-excursion
	  (set-buffer buf)
	  (insert-file-contents file nil 0 100)
	  (looking-at "BABYL OPTIONS:"))
      (kill-buffer buf))))
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;;; There are functions elsewhere in Emacs that use this function; check
;;; them out before you change the calling method.
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(defun rmail-output (file-name &optional count noattribute)
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  "Append this message to Unix mail file named FILE-NAME.
A prefix argument N says to output N consecutive messages
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starting with the current one.  Deleted messages are skipped and don't count.
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When called from lisp code, N may be omitted.

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If the pruned message header is shown on the current message, then
messages will be appended with pruned headers; otherwise, messages
will be appended with their original headers.

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The optional third argument NOATTRIBUTE, if non-nil, says not
to set the `filed' attribute, and not to display a message."
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  (interactive
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   (list (setq rmail-last-file
	       (read-file-name
		(concat "Output message to Unix mail file"
			(if rmail-last-file
			    (concat " (default "
				    (file-name-nondirectory rmail-last-file)
				    "): " )
			  ": "))			
		(and rmail-last-file (file-name-directory rmail-last-file))
		rmail-last-file))
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	 (prefix-numeric-value current-prefix-arg)))
  (or count (setq count 1))
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  (setq file-name
	(expand-file-name file-name
			  (and rmail-last-file
			       (file-name-directory rmail-last-file))))
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  (if (and (file-readable-p file-name) (rmail-file-p file-name))
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      (rmail-output-to-rmail-file file-name count)
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    (let ((orig-count count)
	  (rmailbuf (current-buffer))
	  (case-fold-search t)
	  (tembuf (get-buffer-create " rmail-output"))
	  (original-headers-p
	   (save-excursion 
	     (save-restriction
	       (narrow-to-region (rmail-msgbeg rmail-current-message) (point-max))
	       (goto-char (point-min))
	       (forward-line 1)
	       (= (following-char) ?0))))
	  header-beginning
	  mail-from)
      (while (> count 0)
	(setq mail-from
	      (save-excursion
		(save-restriction
		  (widen)
		  (goto-char (rmail-msgbeg rmail-current-message))
		  (setq header-beginning (point))
		  (search-forward "\n*** EOOH ***\n")
		  (narrow-to-region header-beginning (point))
		  (mail-fetch-field "Mail-From"))))
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	(save-excursion
	  (set-buffer tembuf)
	  (erase-buffer)
	  (insert-buffer-substring rmailbuf)
	  (insert "\n")
	  (goto-char (point-min))
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	  (if mail-from
	      (insert mail-from "\n")
	    (insert "From "
		    (mail-strip-quoted-names (or (mail-fetch-field "from")
						 (mail-fetch-field "really-from")
						 (mail-fetch-field "sender")
						 "unknown"))
		    " " (current-time-string) "\n"))
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	  ;; ``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.)
	  (while (search-forward "\nFrom " nil t)
	    (forward-char -5)
	    (insert ?>))
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	  (write-region (point-min) (point-max) file-name t
			(if noattribute 'nomsg)))
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	(or noattribute
	    (if (equal major-mode 'rmail-mode)
		(rmail-set-attribute "filed" t)))
	(setq count (1- count))
	(let ((next-message-p
	       (if rmail-delete-after-output
		   (rmail-delete-forward)
		 (if (> count 0)
		     (rmail-next-undeleted-message 1))))
	      (num-appended (- orig-count count)))
	  (if (and next-message-p original-headers-p)
	      (rmail-toggle-header))
	  (if (and (> count 0) (not next-message-p))
	      (progn 
		(error
		 (save-excursion
		   (set-buffer rmailbuf)
		   (format "Only %d message%s appended" num-appended
			   (if (= num-appended 1) "" "s"))))
		(setq count 0)))))
      (kill-buffer tembuf))))
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;;; rmailout.el ends here