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;;; gnus-rmail.el --- Saving to rmail/babyl files -*- lexical-binding: t; -*-
;; Copyright (C) 2021-2025 Free Software Foundation, Inc.
;; 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
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
;;; Functions for saving to babyl/mail files.
(require 'rmail)
(require 'rmailsum)
(require 'nnmail)
(defun gnus-output-to-rmail (filename &optional ask)
"Append the current article to an Rmail file named FILENAME.
In Emacs 22 this writes Babyl format; in Emacs 23 it writes mbox unless
FILENAME exists and is Babyl format."
;; Some of this codes is borrowed from rmailout.el.
(setq filename (expand-file-name filename))
;; FIXME should we really be messing with this defcustom?
;; It is not needed for the operation of this function.
(if (boundp 'rmail-default-rmail-file)
(setq rmail-default-rmail-file filename) ; 22
(setq rmail-default-file filename)) ; 23
(let ((artbuf (current-buffer))
(tmpbuf (gnus-get-buffer-create " *Gnus-output*"))
;; Babyl rmail.el defines this, mbox does not.
(babyl (fboundp 'rmail-insert-rmail-file-header)))
(save-excursion
;; Note that we ignore the possibility of visiting a Babyl
;; format buffer in Emacs 23, since Rmail no longer supports that.
(or (get-file-buffer filename)
(progn
;; In case someone wants to write to a Babyl file from Emacs 23.
(when (file-exists-p filename)
(setq babyl (mail-file-babyl-p filename))
t))
(if (or (not ask)
(gnus-yes-or-no-p
(concat "\"" filename "\" does not exist, create it? ")))
(let ((file-buffer (create-file-buffer filename)))
(with-current-buffer file-buffer
(if (fboundp 'rmail-insert-rmail-file-header)
(rmail-insert-rmail-file-header))
(let ((require-final-newline nil)
(coding-system-for-write mm-text-coding-system))
(gnus-write-buffer filename)))
(kill-buffer file-buffer))
(error "Output file does not exist")))
(set-buffer tmpbuf)
(erase-buffer)
(insert-buffer-substring artbuf)
(if babyl
(gnus-convert-article-to-rmail)
;; Non-Babyl case copied from gnus-output-to-mail.
(goto-char (point-min))
(if (looking-at "From ")
(forward-line 1)
(insert "From nobody " (current-time-string) "\n"))
(let (case-fold-search)
(while (re-search-forward "^From " nil t)
(beginning-of-line)
(insert ">"))))
;; Decide whether to append to a file or to an Emacs buffer.
(let ((outbuf (get-file-buffer filename)))
(if (not outbuf)
(progn
(unless babyl ; from gnus-output-to-mail
(let ((buffer-read-only nil))
(goto-char (point-max))
(forward-char -2)
(unless (looking-at "\n\n")
(goto-char (point-max))
(unless (bolp)
(insert "\n"))
(insert "\n"))))
(let ((file-name-coding-system nnmail-pathname-coding-system))
(mm-append-to-file (point-min) (point-max) filename)))
;; File has been visited, in buffer OUTBUF.
(set-buffer outbuf)
(let ((buffer-read-only nil)
(msg (and (boundp 'rmail-current-message)
(symbol-value 'rmail-current-message))))
;; If MSG is non-nil, buffer is in RMAIL mode.
;; Compare this with rmail-output-to-rmail-buffer in Emacs 23.
(when msg
(unless babyl
(rmail-swap-buffers-maybe)
(rmail-maybe-set-message-counters))
(widen)
(unless babyl
(goto-char (point-max))
;; Ensure we have a blank line before the next message.
(unless (bolp)
(insert "\n"))
(insert "\n"))
(narrow-to-region (point-max) (point-max)))
(insert-buffer-substring tmpbuf)
(when msg
(when babyl
(goto-char (point-min))
(widen)
(search-backward "\n\^_")
(narrow-to-region (point) (point-max)))
(rmail-count-new-messages t)
(when (rmail-summary-exists)
(rmail-select-summary
(rmail-update-summary)))
(rmail-show-message msg))
(save-buffer)))))
(kill-buffer tmpbuf)))
(defun gnus-convert-article-to-rmail ()
"Convert article in current buffer to Rmail message format."
(let ((buffer-read-only nil))
;; Convert article directly into Babyl format.
(goto-char (point-min))
(insert "\^L\n0, unseen,,\n*** EOOH ***\n")
(while (search-forward "\n\^_" nil t) ;single char
(replace-match "\n^_" t t)) ;2 chars: "^" and "_"
(goto-char (point-max))
(insert "\^_")))
;;; gnus-rmail.el ends here
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