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434 lines
17 KiB
EmacsLisp
434 lines
17 KiB
EmacsLisp
;;; notifications.el --- Client interface to desktop notifications. -*- lexical-binding: t -*-
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;; Copyright (C) 2010-2024 Free Software Foundation, Inc.
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;; Author: Julien Danjou <julien@danjou.info>
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;; Keywords: comm desktop notifications
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This package provides an implementation of the Desktop Notifications
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;; <https://specifications.freedesktop.org/notification-spec/latest/>.
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;; In order to activate this package, you must add the following code
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;; into your .emacs:
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;;
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;; (require 'notifications)
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;; For proper usage, Emacs must be started in an environment with an
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;; active D-Bus session bus.
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;;; Code:
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(require 'dbus)
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(defconst notifications-specification-version "1.2"
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"The version of the Desktop Notifications Specification implemented.")
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(defconst notifications-application-name "Emacs"
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"Default application name.")
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(defconst notifications-application-icon
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(expand-file-name
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"images/icons/hicolor/scalable/apps/emacs.svg"
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data-directory)
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"Default application icon.")
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(defconst notifications-service "org.freedesktop.Notifications"
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"D-Bus notifications service name.")
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(defconst notifications-path "/org/freedesktop/Notifications"
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"D-Bus notifications service path.")
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(defconst notifications-interface "org.freedesktop.Notifications"
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"D-Bus notifications service interface.")
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(defconst notifications-notify-method "Notify"
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"D-Bus notifications notify method.")
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(defconst notifications-close-notification-method "CloseNotification"
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"D-Bus notifications close notification method.")
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(defconst notifications-get-capabilities-method "GetCapabilities"
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"D-Bus notifications get capabilities method.")
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(defconst notifications-get-server-information-method "GetServerInformation"
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"D-Bus notifications get server information method.")
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(defconst notifications-action-signal "ActionInvoked"
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"D-Bus notifications action signal.")
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(defconst notifications-closed-signal "NotificationClosed"
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"D-Bus notifications closed signal.")
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(defconst notifications-closed-reason
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'((1 expired)
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(2 dismissed)
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(3 close-notification)
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(4 undefined))
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"List of reasons why a notification has been closed.")
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(defvar notifications-on-action-map nil
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"Mapping between notification and action callback functions.")
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(defvar notifications-on-action-object nil
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"Object for registered on-action signal.")
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(defvar notifications-on-close-map nil
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"Mapping between notification and close callback functions.")
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(defvar notifications-on-close-object nil
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"Object for registered on-close signal.")
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(defun notifications-on-action-signal (id action)
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"Dispatch signals to callback functions from `notifications-on-action-map'."
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(let* ((bus (dbus-event-bus-name last-input-event))
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(unique-name (dbus-event-service-name last-input-event))
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(entry (assoc (list bus unique-name id) notifications-on-action-map)))
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(when entry
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(funcall (cadr entry) id action)
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(when (and (not (setq notifications-on-action-map
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(remove entry notifications-on-action-map)))
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notifications-on-action-object)
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(dbus-unregister-object notifications-on-action-object)
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(setq notifications-on-action-object nil)))))
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(defun notifications-on-closed-signal (id &optional reason)
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"Dispatch signals to callback functions from `notifications-on-close-map'."
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;; notification-daemon prior 0.4.0 does not send a reason. So we
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;; make it optional, and assume `undefined' as default.
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(let* ((bus (dbus-event-bus-name last-input-event))
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(unique-name (dbus-event-service-name last-input-event))
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(entry (assoc (list bus unique-name id) notifications-on-close-map))
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(reason (or reason 4)))
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(when entry
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(funcall (cadr entry)
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id (cadr (assoc reason notifications-closed-reason)))
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(when (and (not (setq notifications-on-close-map
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(remove entry notifications-on-close-map)))
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notifications-on-close-object)
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(dbus-unregister-object notifications-on-close-object)
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(setq notifications-on-close-object nil)))))
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(defun notifications-notify (&rest params)
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"Send notification via D-Bus using the Freedesktop notification protocol.
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Various PARAMS can be set:
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:bus The D-Bus bus, if different from `:session'.
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:title The notification title.
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:body The notification body text.
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:app-name The name of the application sending the notification.
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Default to `notifications-application-name'.
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:replaces-id The notification ID that this notification replaces.
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:app-icon The notification icon.
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Default is `notifications-application-icon'.
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Set to nil if you do not want any icon displayed.
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If the value is a string, the function
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interprets it as a file name and converts to
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absolute by using `expand-file-name'; if it is a
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symbol, the function will use its name (which is
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useful when using the Icon Naming
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Specification).
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:actions A list of actions in the form:
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(KEY TITLE KEY TITLE ...)
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where KEY and TITLE are both strings.
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The default action (usually invoked by clicking the
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notification) should have a key named \"default\".
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The title can be anything, though implementations are free
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not to display it.
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:timeout The timeout time in milliseconds since the display
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of the notification at which the notification should
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automatically close.
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If -1, the notification's expiration time is dependent
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on the notification server's settings, and may vary for
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the type of notification.
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If 0, the notification never expires.
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Default value is -1.
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:urgency The urgency level.
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Either `low', `normal' or `critical'.
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:action-items Whether the TITLE of the actions is interpreted as
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a named icon.
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:category The type of notification this is.
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:desktop-entry This specifies the name of the desktop filename representing
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the calling program.
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:image-data This is a raw data image format which describes the width,
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height, rowstride, has alpha, bits per sample, channels and
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image data respectively.
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:image-path This is represented either as a URI (file:// is the
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only URI schema supported right now) or a name
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in a freedesktop.org-compliant icon theme.
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:sound-file The path to a sound file to play when the notification pops up.
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:sound-name A themable named sound from the freedesktop.org sound naming
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specification to play when the notification pops up.
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Similar to icon-name, only for sounds. An example would
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be \"message-new-instant\".
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:suppress-sound Causes the server to suppress playing any sounds, if it has
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that ability.
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:resident When set the server will not automatically remove the
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notification when an action has been invoked.
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:transient When set the server will treat the notification as transient
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and by-pass the server's persistence capability, if it
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should exist.
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:x Specifies the X location on the screen that the notification
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should point to. The \"y\" hint must also be specified.
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:y Specifies the Y location on the screen that the notification
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should point to. The \"x\" hint must also be specified.
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:on-action Function to call when an action is invoked.
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The notification id and the key of the action are passed
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as arguments to the function.
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:on-close Function to call when the notification has been closed
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by timeout or by the user.
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The function receive the notification id and the closing
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reason as arguments:
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- `expired' if the notification has expired
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- `dismissed' if the notification was dismissed by the user
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- `close-notification' if the notification was closed
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by a call to CloseNotification
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- `undefined' if the notification server hasn't provided
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a reason
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Which parameters are accepted by the notification server can be
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checked via `notifications-get-capabilities'.
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This function returns a notification id, an integer, which can be
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used to manipulate the notification item with
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`notifications-close-notification' or the `:replaces-id' argument
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of another `notifications-notify' call."
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(with-demoted-errors "Notification error: %S"
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(let ((bus (or (plist-get params :bus) :session))
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(title (plist-get params :title))
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(body (plist-get params :body))
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(app-name (plist-get params :app-name))
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(replaces-id (plist-get params :replaces-id))
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(app-icon (plist-get params :app-icon))
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(actions (plist-get params :actions))
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(timeout (plist-get params :timeout))
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;; Hints
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(hints '())
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(urgency (plist-get params :urgency))
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(category (plist-get params :category))
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(desktop-entry (plist-get params :desktop-entry))
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(image-data (plist-get params :image-data))
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(image-path (plist-get params :image-path))
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(action-items (plist-get params :action-items))
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(sound-file (plist-get params :sound-file))
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(sound-name (plist-get params :sound-name))
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(suppress-sound (plist-get params :suppress-sound))
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(resident (plist-get params :resident))
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(transient (plist-get params :transient))
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(x (plist-get params :x))
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(y (plist-get params :y))
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id)
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;; Build hints array
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(when urgency
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(push `(:dict-entry
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"urgency"
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(:variant :byte ,(pcase urgency
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('low 0)
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('critical 2)
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(_ 1))))
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hints))
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(when category
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(push `(:dict-entry
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"category"
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(:variant :string ,category))
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hints))
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(when desktop-entry
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(push `(:dict-entry
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"desktop-entry"
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(:variant :string ,desktop-entry))
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hints))
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(when image-data
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(push `(:dict-entry
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"image-data"
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(:variant :struct ,image-data))
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hints))
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(when image-path
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(push `(:dict-entry
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"image-path"
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(:variant :string ,image-path))
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hints))
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(when action-items
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(push `(:dict-entry
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"action-items"
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(:variant :boolean ,action-items))
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hints))
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(when sound-file
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(push `(:dict-entry
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"sound-file"
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(:variant :string ,sound-file))
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hints))
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(when sound-name
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(push `(:dict-entry
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"sound-name"
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(:variant :string ,sound-name))
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hints))
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(when suppress-sound
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(push `(:dict-entry
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"suppress-sound"
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(:variant :boolean ,suppress-sound))
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hints))
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(when resident
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(push `(:dict-entry
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"resident"
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(:variant :boolean ,resident))
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hints))
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(when transient
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(push `(:dict-entry
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"transient"
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(:variant :boolean ,transient))
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hints))
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(when x
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(push `(:dict-entry "x" (:variant :int32 ,x)) hints))
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(when y
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(push `(:dict-entry "y" (:variant :int32 ,y)) hints))
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(setq hints (nreverse hints))
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;; Call Notify method.
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(setq id
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(dbus-call-method bus
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notifications-service
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notifications-path
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notifications-interface
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notifications-notify-method
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:string (or app-name
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notifications-application-name)
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:uint32 (or replaces-id 0)
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:string (if app-icon
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(if (stringp app-icon)
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(expand-file-name app-icon)
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;; Convert symbol to string
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(symbol-name app-icon))
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;; If app-icon is nil because user
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;; requested it to be so, send the
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;; empty string
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(if (plist-member params :app-icon)
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""
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;; Otherwise send the
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;; default icon path
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notifications-application-icon))
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:string (or title "")
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:string (or body "")
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`(:array ,@actions)
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(or hints '(:array :signature "{sv}"))
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:int32 (or timeout -1)))
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;; Register close/action callback function. We must also
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;; remember the daemon's unique name, because the daemon could
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;; have restarted.
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(let ((on-action (plist-get params :on-action))
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(on-close (plist-get params :on-close))
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(unique-name (dbus-get-name-owner bus notifications-service)))
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(when on-action
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(push (list (list bus unique-name id) on-action)
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notifications-on-action-map)
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(unless notifications-on-action-object
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(setq notifications-on-action-object
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(dbus-register-signal
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bus
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nil
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notifications-path
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notifications-interface
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notifications-action-signal
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'notifications-on-action-signal))))
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(when on-close
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(push (list (list bus unique-name id) on-close)
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notifications-on-close-map)
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(unless notifications-on-close-object
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(setq notifications-on-close-object
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(dbus-register-signal
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bus
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nil
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notifications-path
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notifications-interface
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notifications-closed-signal
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'notifications-on-closed-signal)))))
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;; Return notification id
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id)))
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(defun notifications-close-notification (id &optional bus)
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"Close a notification with identifier ID.
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BUS can be a string denoting a D-Bus connection, the default is `:session'."
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(dbus-call-method (or bus :session)
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notifications-service
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notifications-path
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notifications-interface
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notifications-close-notification-method
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:uint32 id))
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(defvar dbus-debug) ; used in the macroexpansion of dbus-ignore-errors
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(defun notifications-get-capabilities (&optional bus)
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"Return the capabilities of the notification server, a list of symbols.
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BUS can be a string denoting a D-Bus connection, the default is `:session'.
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The following capabilities can be expected:
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:actions The server will provide the specified actions
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to the user.
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:action-icons Supports using icons instead of text for
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displaying actions.
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:body Supports body text.
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:body-hyperlinks The server supports hyperlinks in the notifications.
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:body-images The server supports images in the notifications.
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:body-markup Supports markup in the body text.
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:icon-multi The server will render an animation of all the
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frames in a given image array.
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:icon-static Supports display of exactly 1 frame of any
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given image array. This value is mutually exclusive
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with `:icon-multi'.
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:persistence The server supports persistence of notifications.
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:sound The server supports sounds on notifications.
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Further vendor-specific caps start with `:x-vendor', like `:x-gnome-foo-cap'."
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(dbus-ignore-errors
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(mapcar
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(lambda (x) (intern (concat ":" x)))
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(dbus-call-method (or bus :session)
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notifications-service
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notifications-path
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notifications-interface
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notifications-get-capabilities-method))))
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(defun notifications-get-server-information (&optional bus)
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"Return information on the notification server, a list of strings.
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BUS can be a string denoting a D-Bus connection, the default is `:session'.
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The returned list is (NAME VENDOR VERSION SPEC-VERSION).
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NAME The product name of the server.
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VENDOR The vendor name. For example, \"KDE\", \"GNOME\".
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VERSION The server's version number.
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SPEC-VERSION The specification version the server is compliant with.
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If SPEC_VERSION is missing, the server supports a specification
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prior to \"1.0\".
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See `notifications-specification-version' for the specification
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version this library is compliant with."
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(dbus-ignore-errors
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(dbus-call-method (or bus :session)
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notifications-service
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notifications-path
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notifications-interface
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notifications-get-server-information-method)))
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(provide 'notifications)
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;;; notifications.el ends here
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