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;;; nm.el --- Simple NetworkManager integration through D-Bus. -*- lexical-binding: t; -*-
;; -*- coding: utf-8 -*-
;; Author: Øyvind Stegard <oyvind.stegard@ifi.uio.no>
;; License: Public domain, use at own risk, no warranties of any kind.
;; Requires Emacs23 with D-Bus bindings and preferably a running NetworkManager
;; instance.
;;
;; You will need to call the function `nm-enable' for things to start happening.
;; Functions you would like to run when network is connected:
;; (add-hook 'nm-connected-hook 'ping-skynet)
;;
;; Functions you would like to run when network is disconnected:
;; (add-hook 'nm-disconnected-hook (lambda() (message "Darnit, we are down.")))
(require 'dbus)
(defcustom nm-connected-hook nil
"A hook variable which runs when network is connected."
:type 'hook
:group 'emacspeak-dbus)
(defcustom nm-disconnected-hook nil
"A hook variable which runs when network is disconnected."
:type 'hook
:group 'emacspeak-dbus)
(defvar nm-service "org.freedesktop.NetworkManager"
"Name of NetworkManager service.")
(defvar nm-path "/org/freedesktop/NetworkManager"
"NetworkManager Path in DBus.")
(defvar nm-interface "org.freedesktop.NetworkManager"
"NMetworkManager interface in DBus.")
(defun nm-is-connected()
"Returns t if NetworkManager is connected, nil otherwise."
(declare (special nm-service nm-path nm-interface))
(equal 3
(dbus-get-property :system
nm-service nm-path nm-interface
"State")))
(defvar nm-dbus-registration nil
"Records if nm-dbus is initialized.")
;;;###autoload
(defun nm-enable()
"Enable integration with NetworkManager. Does nothing if already enabled."
(interactive)
(declare (special nm-service nm-path nm-interface))
(declare (special nm-dbus-registration))
(unless nm-dbus-registration
(setq nm-dbus-registration
(dbus-register-signal
:system
nm-service nm-path nm-interface
"StateChanged"
'nm-state-dbus-signal-handler))
(message "Enabled integration with NetworkManager.")))
;;;###autoload
(defun nm-disable()
"Disable integration with NetworkManager. Does nothing if already disabled."
(interactive)
(declare (special nm-dbus-registration))
(when nm-dbus-registration
(dbus-unregister-object nm-dbus-registration)
(setq nm-dbus-registration nil)
(message "Disabled integration with NetworkManager.")))
(defun nm-state-dbus-signal-handler (nm-state)
"Handles NetworkManager signals and runs appropriate hooks."
(cond
((or (= 4 nm-state) (= 1 nm-state))
(run-hooks 'nm-disconnected-hook))
((= 3 nm-state)
(run-hooks 'nm-connected-hook))))
(provide 'nm)
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