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;;; gnus-dbus.el --- DBUS integration for Gnus -*- lexical-binding: t; -*-
;; Copyright (C) 2020-2024 Free Software Foundation, Inc.
;; Author: Eric Abrahamsen <eric@ericabrahamsen.net>
;; 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:
;; This library contains some Gnus integration for systems using DBUS.
;; At present it registers a signal to close all Gnus servers before
;; system sleep or hibernation.
;;; Code:
(require 'gnus)
(require 'dbus)
(declare-function gnus-close-all-servers "gnus-start")
(defcustom gnus-dbus-close-on-sleep nil
"When non-nil, close Gnus servers on system sleep."
:group 'gnus-dbus
:type 'boolean)
(defvar gnus-dbus-sleep-registration-object nil
"Object returned from `dbus-register-signal'.
Used to unregister the signal.")
(defun gnus-dbus-register-sleep-signal ()
"Use `dbus-register-signal' to close servers on sleep."
(when (featurep 'dbusbind)
(setq gnus-dbus-sleep-registration-object
(dbus-register-signal :system
"org.freedesktop.login1"
"/org/freedesktop/login1"
"org.freedesktop.login1.Manager"
"PrepareForSleep"
#'gnus-dbus-sleep-handler))
(gnus-add-shutdown #'gnus-dbus-unregister-sleep-signal 'gnus)))
(defun gnus-dbus-sleep-handler (sleep-start)
;; Sleep-start is t before sleeping.
(when (and sleep-start
(gnus-alive-p))
(condition-case nil
(gnus-close-all-servers)
(error nil))))
(defun gnus-dbus-unregister-sleep-signal ()
(condition-case nil
(dbus-unregister-object
gnus-dbus-sleep-registration-object)
(wrong-type-argument nil)))
(provide 'gnus-dbus)
;;; gnus-dbus.el ends here
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