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;;; rnewspost.el --- USENET news poster/mailer for GNU Emacs

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;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.

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;; Maintainer: FSF
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;; Keywords: mail, news
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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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;; Change Log:

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;; moved posting and mail code from rnews.el
;;	tower@prep.ai.mit.edu Wed Oct 29 1986
;; brought posting code almost up to the revision of RFC 850 for News 2.11
;; - couldn't see handling the special meaning of the Keyword: poster
;; - not worth the code space to support the old A news Title: (which
;;   Subject: replaced) and Article-I.D.: (which Message-ID: replaced)
;;	tower@prep Nov 86
;; changed C-c C-r key-binding due to rename of news-caesar-buffer-body
;;	tower@prep 21 Nov 86
;; added (require 'rnews)	tower@prep 22 Apr 87
;; restricted call of news-show-all-headers in news-post-news & news-reply
;;	tower@prep 28 Apr 87
;; commented out Posting-Front-End to save USENET bytes tower@prep Jul 31 87
;; commented out -n and -t args in news-inews     tower@prep 15 Oct 87

;Now in paths.el.
;(defvar news-inews-program "inews"
;  "Function to post news.")

;; Replying and posting news items are done by these functions.
;; imported from rmail and modified to work with rnews ...
;; Mon Mar 25,1985 at 03:07:04 ads@mit-hermes.
;; this is done so that rnews can operate independently from rmail.el and
;; sendmail and dosen't have to autoload these functions.
;;
;;; >> Nuked by Mly to autoload those functions again, as the duplication of
;;; >>  code was making maintenance too difficult.

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;;; Code:

(require 'sendmail)
(require 'rnews)

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(defvar news-reply-mode-map () "Mode map used by news-reply.")

(or news-reply-mode-map
    (progn
      (setq news-reply-mode-map (make-keymap))
      (define-key news-reply-mode-map "\C-c?" 'describe-mode)
      (define-key news-reply-mode-map "\C-c\C-f\C-d" 'news-reply-distribution)
      (define-key news-reply-mode-map "\C-c\C-f\C-k" 'news-reply-keywords)
      (define-key news-reply-mode-map "\C-c\C-f\C-n" 'news-reply-newsgroups)
      (define-key news-reply-mode-map "\C-c\C-f\C-f" 'news-reply-followup-to)
      (define-key news-reply-mode-map "\C-c\C-f\C-s" 'mail-subject)
      (define-key news-reply-mode-map "\C-c\C-f\C-a" 'news-reply-summary)
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      (define-key news-reply-mode-map "\C-c\C-t" 'mail-text)
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      (define-key news-reply-mode-map "\C-c\C-r" 'news-caesar-buffer-body)
      (define-key news-reply-mode-map "\C-c\C-w" 'news-reply-signature)
      (define-key news-reply-mode-map "\C-c\C-y" 'news-reply-yank-original)
      (define-key news-reply-mode-map "\C-c\C-q" 'mail-fill-yanked-message)
      (define-key news-reply-mode-map "\C-c\C-c" 'news-inews)
      (define-key news-reply-mode-map "\C-c\C-s" 'news-inews)))

(defun news-reply-mode ()
  "Major mode for editing news to be posted on USENET.
First-time posters are asked to please read the articles in newsgroup:
                                                     news.announce.newusers .
Like Text Mode but with these additional commands:

C-c C-s  news-inews (post the message)    C-c C-c  news-inews
C-c C-f	 move to a header field (and create it if there isn't):
	 C-c C-f C-n  move to Newsgroups:	C-c C-f C-s  move to Subj:
	 C-c C-f C-f  move to Followup-To:      C-c C-f C-k  move to Keywords:
	 C-c C-f C-d  move to Distribution:	C-c C-f C-a  move to Summary:
C-c C-y  news-reply-yank-original (insert current message, in NEWS).
C-c C-q  mail-fill-yanked-message (fill what was yanked).
C-c C-r  caesar rotate all letters by 13 places in the article's body (rot13)."
  (interactive)
  ;; require...
  (or (fboundp 'mail-setup) (load "sendmail"))
  (kill-all-local-variables)
  (make-local-variable 'mail-reply-buffer)
  (setq mail-reply-buffer nil)
  (set-syntax-table text-mode-syntax-table)
  (use-local-map news-reply-mode-map)
  (setq local-abbrev-table text-mode-abbrev-table)
  (setq major-mode 'news-reply-mode)
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  (setq mode-name "News Reply")
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  (make-local-variable 'paragraph-separate)
  (make-local-variable 'paragraph-start)
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  (setq paragraph-start (concat mail-header-separator "$\\|"
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				paragraph-start))
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  (setq paragraph-separate (concat mail-header-separator "$\\|"
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				   paragraph-separate))
  (run-hooks 'text-mode-hook 'news-reply-mode-hook))

(defvar news-reply-yank-from
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  "Save `From:' field for `news-reply-yank-original'."
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  "")

(defvar news-reply-yank-message-id
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  "Save `Message-Id:' field for `news-reply-yank-original'."
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  "")

(defun news-reply-yank-original (arg)
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  "Insert the message being replied to, if any (in Mail mode).
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Puts point before the text and mark after.
Indents each nonblank line ARG spaces (default 3).
Just \\[universal-argument] as argument means don't indent
and don't delete any header fields."
  (interactive "P")
  (mail-yank-original arg)
  (exchange-point-and-mark)
  (run-hooks 'news-reply-header-hook))

(defvar news-reply-header-hook
  '(lambda ()
	 (insert "In article " news-reply-yank-message-id
			 " " news-reply-yank-from " writes:\n\n"))
  "Hook for inserting a header at the top of a yanked message.")

(defun news-reply-newsgroups ()
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  "Move point to end of `Newsgroups:' field.
RFC 850 constrains the `Newsgroups:' field to be a comma-separated list
of valid newsgroup names at your site.  For example,
   Newsgroups: news.misc,comp.misc,rec.misc"
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  (interactive)
  (expand-abbrev)
  (goto-char (point-min))
  (mail-position-on-field "Newsgroups"))

(defun news-reply-followup-to ()
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  "Move point to end of `Followup-To:' field.  Create the field if none.
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One usually requests followups to only one newsgroup.
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RFC 850 constrains the `Followup-To:' field to be a comma-separated list
of valid newsgroups names at your site, and it must be a subset of the
`Newsgroups:' field.  For example:
   Newsgroups: news.misc,comp.misc,rec.misc,misc.misc,soc.misc
   Followup-To: news.misc,comp.misc,rec.misc"
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  (interactive)
  (expand-abbrev)
  (or (mail-position-on-field "Followup-To" t)
      (progn (mail-position-on-field "newsgroups")
	     (insert "\nFollowup-To: ")))
	 ;; @@ could do a completing read based on the Newsgroups: field to
	 ;; @@ fill in the Followup-To: field
)

(defun news-reply-distribution ()
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  "Move point to end of `Distribution:' optional field.
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Create the field if none.  Without this field the posting goes to all of
USENET.  The field is used to restrict the posting to parts of USENET."
  (interactive)
  (expand-abbrev)
  (mail-position-on-field "Distribution")
  ;; @@could do a completing read based on the news library file:
  ;; @@    ../distributions  to fill in the field.
  )

(defun news-reply-keywords ()
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  "Move point to end of `Keywords:' optional field.  Create the field if none.
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Used as an aid to the news reader, it can contain a few, well selected keywords
identifying the message."
  (interactive)
  (expand-abbrev)
  (mail-position-on-field "Keywords"))

(defun news-reply-summary ()
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  "Move point to end of `Summary:' optional field.  Create the field if none.
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Used as an aid to the news reader, it can contain a succinct
summary (abstract) of the message."
  (interactive)
  (expand-abbrev)
  (mail-position-on-field "Summary"))

(defun news-reply-signature ()
  "The inews program appends ~/.signature automatically."
  (interactive)
  (message "~/.signature will be appended automatically."))

(defun news-setup (to subject in-reply-to newsgroups replybuffer)
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  "Set up the news reply or posting buffer with the proper headers and mode."
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  (setq mail-reply-buffer replybuffer)
  (let ((mail-setup-hook nil))
    (if (null to)
	;; this hack is needed so that inews wont be confused by 
	;; the fcc: and bcc: fields
	(let ((mail-self-blind nil)
	      (mail-archive-file-name nil))
	  (mail-setup to subject in-reply-to nil replybuffer nil)
	  (beginning-of-line)
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	  (delete-region (point) (progn (forward-line 1) (point)))
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	  (goto-char (point-max)))
      (mail-setup to subject in-reply-to nil replybuffer nil))
    ;;;(mail-position-on-field "Posting-Front-End")
    ;;;(insert (emacs-version))
    (goto-char (point-max))
    (if (let ((case-fold-search t))
	  (re-search-backward "^Subject:" (point-min) t))
	(progn (beginning-of-line)
	       (insert "Newsgroups: " (or newsgroups "") "\n")
	       (if (not newsgroups)
		   (backward-char 1)
		 (goto-char (point-max)))))
    (run-hooks 'news-setup-hook)))
   
(defun news-inews ()
  "Send a news message using inews."
  (interactive)
  (let* (newsgroups subject
		    (case-fold-search nil))
    (save-excursion
      (save-restriction
	(goto-char (point-min))
	(search-forward (concat "\n" mail-header-separator "\n"))
	(narrow-to-region (point-min) (point))
	(setq newsgroups (mail-fetch-field "newsgroups")
	      subject (mail-fetch-field "subject")))
      (widen)
      (goto-char (point-min))
      (run-hooks 'news-inews-hook)
      (goto-char (point-min))
      (search-forward (concat "\n" mail-header-separator "\n"))
      (replace-match "\n\n")
      (goto-char (point-max))
      ;; require a newline at the end for inews to append .signature to
      (or (= (preceding-char) ?\n)
	  (insert ?\n))
      (message "Posting to USENET...")
      (call-process-region (point-min) (point-max) 
			   news-inews-program nil 0 nil
			   "-h")	; take all header lines!
			   ;@@ setting of subject and newsgroups still needed?
			   ;"-t" subject
			   ;"-n" newsgroups
      (message "Posting to USENET... done")
      (goto-char (point-min))		;restore internal header separator
      (search-forward "\n\n")
      (replace-match (concat "\n" mail-header-separator "\n"))
      (set-buffer-modified-p nil))
    (and (fboundp 'bury-buffer) (bury-buffer))))

;@@ shares some code with news-reply and news-post-news
(defun news-mail-reply ()
  "Mail a reply to the author of the current article.
While composing the reply, use \\[news-reply-yank-original] to yank the
original message into it."
  (interactive)
  (let (from cc subject date to reply-to
	     (buffer (current-buffer)))
    (save-restriction
      (narrow-to-region (point-min) (progn (goto-line (point-min))
					   (search-forward "\n\n")
					   (- (point) 1)))
      (setq from (mail-fetch-field "from")
	    subject (mail-fetch-field "subject")
	    reply-to (mail-fetch-field "reply-to")
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	    date (mail-fetch-field "date")))
    (setq to from)
    (pop-to-buffer "*mail*")
    (mail nil
	  (if reply-to reply-to to)
	  subject
	  (let ((stop-pos (string-match "  *at \\|  *@ \\| *(\\| *<" from)))
	    (concat (if stop-pos (substring from 0 stop-pos) from)
		    "'s message of "
		    date))
	  nil
	 buffer)))
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;@@ the guts of news-reply and news-post-news should be combined. -tower
(defun news-reply ()
  "Compose and post a reply (aka a followup) to the current article on USENET.
While composing the followup, use \\[news-reply-yank-original] to yank the
original message into it."
  (interactive)
  (if (y-or-n-p "Are you sure you want to followup to all of USENET? ")
      (let (from cc subject date to followup-to newsgroups message-of
		 references distribution message-id
		 (buffer (current-buffer)))
	(save-restriction
	  (and (not (= 0 (buffer-size))) ;@@real problem is non-existence of
					;@@	of article file
	       (equal major-mode 'news-mode) ;@@ if rmail-mode,
					;@@	should show full headers
	       (progn
		 (news-show-all-headers) ;@@ should save/restore header state,
					;@@	but rnews.el lacks support
		 (narrow-to-region (point-min) (progn (goto-char (point-min))
						      (search-forward "\n\n")
						      (- (point) 1)))))
	  (setq from (mail-fetch-field "from")
		news-reply-yank-from from
		;; @@ not handling old Title: field
		subject (mail-fetch-field "subject")
		date (mail-fetch-field "date")
		followup-to (mail-fetch-field "followup-to")
		newsgroups (or followup-to
			       (mail-fetch-field "newsgroups"))
		references (mail-fetch-field "references")
		;; @@ not handling old Article-I.D.: field
		distribution (mail-fetch-field "distribution")
		message-id (mail-fetch-field "message-id")
		news-reply-yank-message-id message-id)
	  (pop-to-buffer "*post-news*")
	  (news-reply-mode)
	  (if (and (buffer-modified-p)
		   (not
		    (y-or-n-p "Unsent article being composed; erase it? ")))
	      ()
	    (progn
	      (erase-buffer)
	      (and subject
		   (progn (if (string-match "\\`Re: " subject)
			      (while (string-match "\\`Re: " subject)
				(setq subject (substring subject 4))))
			  (setq subject (concat "Re: " subject))))
	      (and from
		   (progn
		     (let ((stop-pos
			    (string-match "  *at \\|  *@ \\| *(\\| *<" from)))
		       (setq message-of
			     (concat
			      (if stop-pos (substring from 0 stop-pos) from)
			      "'s message of "
			      date)))))
	      (news-setup
	       nil
	       subject
	       message-of
	       newsgroups
	       buffer)
	      (if followup-to
		  (progn (news-reply-followup-to)
			 (insert followup-to)))
	      (if distribution
		  (progn
		    (mail-position-on-field "Distribution")
		    (insert distribution)))
	      (mail-position-on-field "References")
	      (if references
		  (insert references))
	      (if (and references message-id)
		  (insert " "))
	      (if message-id
		  (insert message-id))
	      (goto-char (point-max))))))
    (message "")))

;@@ the guts of news-reply and news-post-news should be combined. -tower
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;;;###autoload
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(defun news-post-news ()
  "Begin editing a new USENET news article to be posted.
Type \\[describe-mode] once editing the article to get a list of commands."
  (interactive)
  (if (y-or-n-p "Are you sure you want to post to all of USENET? ")
      (let ((buffer (current-buffer)))
	(save-restriction
	  (and (not (= 0 (buffer-size))) ;@@real problem is non-existence of
					;@@	of article file
	       (equal major-mode 'news-mode) ;@@ if rmail-mode,
					;@@	should show full headers
	       (progn
		 (news-show-all-headers) ;@@ should save/restore header state,
					;@@	but rnews.el lacks support
		 (narrow-to-region (point-min) (progn (goto-char (point-min))
						      (search-forward "\n\n")
						      (- (point) 1)))))
	  (setq news-reply-yank-from (mail-fetch-field "from")
		;; @@ not handling old Article-I.D.: field
		news-reply-yank-message-id (mail-fetch-field "message-id")))
	(pop-to-buffer "*post-news*")
	(news-reply-mode)
	(if (and (buffer-modified-p)
		 (not (y-or-n-p "Unsent article being composed; erase it? ")))
	    ()				;@@ not saving point from last time
	  (progn (erase-buffer)
		 (news-setup () () () () buffer))))
  (message "")))

(defun news-mail-other-window ()
  "Send mail in another window.
While composing the message, use \\[news-reply-yank-original] to yank the
original message into it."
  (interactive)
  (mail-other-window nil nil nil nil nil (current-buffer)))
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;;; rnewspost.el ends here