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emacs/lisp/gnus/nngateway.el
2024-01-02 09:47:10 +08:00

91 lines
2.8 KiB
EmacsLisp

;;; nngateway.el --- posting news via mail gateways -*- lexical-binding: t; -*-
;; Copyright (C) 1996-2024 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news, mail
;; 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:
(require 'nnoo)
(require 'message)
(nnoo-declare nngateway)
(defvoo nngateway-address nil
"Address of the mail-to-news gateway.")
(defvoo nngateway-header-transformation 'nngateway-simple-header-transformation
"Function to be called to rewrite the news headers into mail headers.
It is called narrowed to the headers to be transformed with one
parameter -- the gateway address.")
;;; Interface functions
(nnoo-define-basics nngateway)
(deffoo nngateway-open-server (server &optional defs)
(if (nngateway-server-opened server)
t
(unless (assq 'nngateway-address defs)
(setq defs (append defs (list (list 'nngateway-address server)))))
(nnoo-change-server 'nngateway server defs)))
(deffoo nngateway-request-post (&optional server)
(when (or (nngateway-server-opened server)
(nngateway-open-server server))
;; Rewrite the header.
(let ((buf (current-buffer)))
(with-temp-buffer
(insert-buffer-substring buf)
(message-narrow-to-head)
(funcall nngateway-header-transformation nngateway-address)
(goto-char (point-max))
(insert mail-header-separator "\n")
(widen)
(let (message-required-mail-headers)
(funcall (or message-send-mail-real-function
message-send-mail-function)))
t))))
;;; Internal functions
(defun nngateway-simple-header-transformation (gateway)
"Transform the headers to use GATEWAY."
(let ((newsgroups (mail-fetch-field "newsgroups")))
(message-remove-header "to")
(message-remove-header "cc")
(goto-char (point-min))
(insert "To: " (nnheader-replace-chars-in-string newsgroups ?. ?-)
"@" gateway "\n")))
(defun nngateway-mail2news-header-transformation (gateway)
"Transform the headers for sending to a mail2news gateway."
(message-remove-header "to")
(message-remove-header "cc")
(goto-char (point-min))
(insert "To: " gateway "\n"))
(nnoo-define-skeleton nngateway)
(provide 'nngateway)
;;; nngateway.el ends here