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;;; notifications.el --- Client interface to desktop notifications.
;; Copyright (C) 2010 Free Software Foundation, Inc.
;; Author: Julien Danjou <julien@danjou.info>
;; Keywords: comm desktop notifications
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This package provides an implementation of the Desktop Notifications
;; <http://www.galago-project.org/specs/notification/>.
;; In order to activate this package, you must add the following code
;; into your .emacs:
;;
;; (require 'notifications)
;;; Code:
(eval-when-compile
(require 'cl))
;; Pacify byte-compiler. D-Bus support in the Emacs core can be
;; disabled with configuration option "--without-dbus". Declare used
;; subroutines and variables of `dbus' therefore.
(declare-function dbus-call-method "dbusbind.c")
(declare-function dbus-register-signal "dbusbind.c")
(require 'dbus)
(defconst notifications-application-name "Emacs"
"Default application name.")
(defconst notifications-application-icon
(expand-file-name
"images/icons/hicolor/scalable/apps/emacs.svg"
data-directory)
"Default application icon.")
(defconst notifications-service "org.freedesktop.Notifications"
"D-Bus notifications service name.")
(defconst notifications-path "/org/freedesktop/Notifications"
"D-Bus notifications service path.")
(defconst notifications-interface "org.freedesktop.Notifications"
"D-Bus notifications service path.")
(defconst notifications-notify-method "Notify"
"D-Bus notifications service path.")
(defconst notifications-close-notification-method "CloseNotification"
"D-Bus notifications service path.")
(defconst notifications-action-signal "ActionInvoked"
"D-Bus notifications action signal.")
(defconst notifications-closed-signal "NotificationClosed"
"D-Bus notifications closed signal.")
(defconst notifications-closed-reason
'((1 expired)
(2 dismissed)
(3 close-notification)
(4 undefined))
"List of reasons why a notification has been closed.")
(defvar notifications-on-action-map nil
"Mapping between notification and action callback functions.")
(defvar notifications-on-close-map nil
"Mapping between notification and close callback functions.")
(defun notifications-on-action-signal (id action)
"Dispatch signals to callback functions from `notifications-on-action-map'."
(let ((entry (assoc id notifications-on-action-map)))
(when entry
(funcall (cadr entry) id action)
(remove entry 'notifications-on-action-map))))
(dbus-register-signal
:session
notifications-service
notifications-path
notifications-interface
notifications-action-signal
'notifications-on-action-signal)
(defun notifications-on-closed-signal (id reason)
"Dispatch signals to callback functions from `notifications-on-closed-map'."
(let ((entry (assoc id notifications-on-close-map)))
(when entry
(funcall (cadr entry)
id (cadr (assoc reason notifications-closed-reason)))
(remove entry 'notifications-on-close-map))))
(dbus-register-signal
:session
notifications-service
notifications-path
notifications-interface
notifications-closed-signal
'notifications-on-closed-signal)
(defun notifications-notify (&rest params)
"Send notification via D-Bus using the Freedesktop notification protocol.
Various PARAMS can be set:
:title The notification title.
:body The notification body text.
:app-name The name of the application sending the notification.
Default to `notifications-application-name'.
:replaces-id The notification ID that this notification replaces.
:app-icon The notification icon.
Default is `notifications-application-icon'.
Set to nil if you do not want any icon displayed.
:actions A list of actions in the form:
(KEY TITLE KEY TITLE ...)
where KEY and TITLE are both strings.
The default action (usually invoked by clicking the
notification) should have a key named \"default\".
The title can be anything, though implementations are free
not to display it.
:timeout The timeout time in milliseconds since the display
of the notification at which the notification should
automatically close.
If -1, the notification's expiration time is dependent
on the notification server's settings, and may vary for
the type of notification.
If 0, the notification never expires.
Default value is -1.
:urgency The urgency level.
Either `low', `normal' or `critical'.
:category The type of notification this is.
:desktop-entry This specifies the name of the desktop filename representing
the calling program.
:image-data This is a raw data image format which describes the width,
height, rowstride, has alpha, bits per sample, channels and
image data respectively.
:sound-file The path to a sound file to play when the notification pops up.
:suppress-sound Causes the server to suppress playing any sounds, if it has
that ability.
:x Specifies the X location on the screen that the notification
should point to. The \"y\" hint must also be specified.
:y Specifies the Y location on the screen that the notification
should point to. The \"x\" hint must also be specified.
:on-action Function to call when an action is invoked.
The notification id and the key of the action are passed
as arguments to the function.
:on-close Function to call when the notification has been closed
by timeout or by the user.
The function receive the notification id and the closing
reason as arguments:
- `expired' if the notification has expired
- `dismissed' if the notification was dismissed by the user
- `close-notification' if the notification was closed
by a call to CloseNotification
This function returns a notification id, an integer, which can be
used to manipulate the notification item with
`notifications-close'."
(let ((title (plist-get params :title))
(body (plist-get params :body))
(app-name (plist-get params :app-name))
(replaces-id (plist-get params :replaces-id))
(app-icon (plist-get params :app-icon))
(actions (plist-get params :actions))
(timeout (plist-get params :timeout))
;; Hints
(hints '())
(urgency (plist-get params :urgency))
(category (plist-get params :category))
(desktop-entry (plist-get params :desktop-entry))
(image-data (plist-get params :image-data))
(sound-file (plist-get params :sound-file))
(suppress-sound (plist-get params :suppress-sound))
(x (plist-get params :x))
(y (plist-get params :y))
id)
;; Build hints array
(when urgency
(add-to-list 'hints `(:dict-entry
"urgency"
(:variant :byte ,(case urgency
('low 0)
('critical 2)
(t 1)))) t))
(when category
(add-to-list 'hints `(:dict-entry
"category"
(:variant :string ,category)) t))
(when desktop-entry
(add-to-list 'hints `(:dict-entry
"desktop-entry"
(:variant :string ,desktop-entry)) t))
(when image-data
(add-to-list 'hints `(:dict-entry
"image_data"
(:variant :struct ,image-data)) t))
(when sound-file
(add-to-list 'hints `(:dict-entry
"sound-file"
(:variant :string ,sound-file)) t))
(when suppress-sound
(add-to-list 'hints `(:dict-entry
"suppress-sound"
(:variant :boolean ,suppress-sound)) t))
(when x
(add-to-list 'hints `(:dict-entry "x" (:variant :int32 ,x)) t))
(when y
(add-to-list 'hints `(:dict-entry "y" (:variant :int32 ,y)) t))
;; Call Notify method
(setq id
(dbus-call-method :session
notifications-service
notifications-path
notifications-interface
notifications-notify-method
:string (or app-name
notifications-application-name)
:uint32 (or replaces-id 0)
:string (if app-icon
(expand-file-name app-icon)
;; If app-icon is nil because user
;; requested it to be so, send the
;; empty string
(if (plist-member params :app-icon)
""
;; Otherwise send the default icon path
notifications-application-icon))
:string (or title "")
:string (or body "")
`(:array ,@actions)
(or hints '(:array :signature "{sv}"))
:int32 (or timeout -1)))
;; Register close/action callback function
(let ((on-action (plist-get params :on-action))
(on-close (plist-get params :on-close)))
(when on-action
(add-to-list 'notifications-on-action-map (list id on-action)))
(when on-close
(add-to-list 'notifications-on-close-map (list id on-close))))
;; Return notification id
id))
(defun notifications-close-notification (id)
"Close a notification with identifier ID."
(dbus-call-method :session
notifications-service
notifications-path
notifications-interface
notifications-close-notification-method
:int32 id))
(provide 'notifications)
|
