naughty: add D-Bus notification support

Allows Naughty to receive D-Bus notifications and emulate notification-daemon
and such.

Signed-off-by: Leon Winter <leon.winter@informatik.uni-oldenburg.de>
Signed-off-by: koniu <gkusnierz@gmail.com>

lib/naughty.lua.in

@@ -16,6 +16,8 @@ local button = button
 local capi = { screen = screen }
 local bt = require("beautiful")
 local screen = screen
+local awful = awful
+local dbus = dbus
 
 --- Notification library
 module("naughty")
@@ -62,6 +64,10 @@ config.icon_size = 16
 config.border_width = 1
 config.hover_timeout = nil
 
+-- Counter for the notifications
+-- Required for later access via DBUS
+local counter = 1
+
 --- Index of notifications. See config table for valid 'position' values.
 -- Each element is a table consisting of:
 -- @field box Wibox object containing the popup
@@ -149,6 +155,22 @@ function destroy(notification)
     end
 end
 
+--- Get notification by ID
+-- @param id ID of the notification
+-- @return notification object if it was found, nil otherwise
+local function getById(id)
+    -- iterate the notifications to get the notfications with the correct ID
+    for s = 1, screen.count() do
+        for p,pos in pairs(notifications[s]) do
+            for i,notification in pairs(notifications[s][p]) do
+                if notification.id == id then
+                    return notification
+                 end
+            end
+        end
+    end
+end
+
 --- Create notification. args is a dictionary of optional arguments. For more information and defaults see respective fields in config table.
 -- @param text Text of the notification
 -- @param timeout Time in seconds after which popup expires
@@ -162,6 +184,7 @@ end
 -- @param ontop Target screen for the notification
 -- @param run Function to run on left click
 -- @param width The popup width
+-- @param replaces_id Replace the notification with the given ID
 -- @usage naughty.notify({ title = 'Achtung!', text = 'You\'re idling', timeout = 0 })
 -- @return The notification object
 function notify(args)
@@ -181,6 +204,27 @@ function notify(args)
     local bg = args.bg or config.bg or beautiful.bg_normal or '#535d6c'
     local border_color = config.border_color or beautiful.bg_focus or '#535d6c'
     local notification = {}
+
+    -- replace notification if needed
+    if args.replaces_id then
+        obj = getById(args.replaces_id)
+        if obj then
+            -- destroy this and ...
+            destroy(obj)
+        end
+        -- ... may use its ID
+        if args.replaces_id < counter then
+            notification.id = args.replaces_id
+        else
+            counter = counter + 1
+            notification.id = counter
+        end
+    else
+        -- get a brand new ID
+        counter = counter + 1
+        notification.id = counter
+    end
+
     notification.position = args.position or config.position
     notification.idx = #notifications[screen][notification.position] + 1
 
@@ -252,4 +296,78 @@ function notify(args)
     -- return the notification
     return notification
 end
+
+-- DBUS/Notification support
+
+-- Notify
+awful.hooks.dbus.register("org.freedesktop.Notifications", function (data, arg1, replaces_id, icon, title, text)
+args = {}
+if data.member == "Notify" then
+    if text ~= "" then
+        args.text = text
+        if title ~= "" then
+            args.title = title
+        end
+    else
+        if title ~= "" then
+            args.text = title
+        else
+            return nil
+        end
+    end
+    if icon ~= "" then
+        args.icon = icon
+    end
+    if replaces_id and replaces_id ~= "" and replaces_id ~= 0 then
+        args.replaces_id = replaces_id
+    end
+    local id = notify(args).id
+    return "i", id
+elseif data.member == "CloseNotification" then
+    local obj = getById(arg1)
+    if obj then
+       destroy(obj)
+    end
+elseif data.member == "GetServerInfo" or data.member == "GetServerInformation" then
+    -- name of notification app, name of project, version of notification app, project version
+    return "s", "naughty", "s", "awesome", "s", "1337", "s", "1337"
+end
+end)
+
+awful.hooks.dbus.register("org.freedesktop.DBus.Introspectable",
+function (data, text)
+if data.member == "Introspect" then
+    local xml = [=[<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object
+Introspection 1.0//EN"
+"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+<node>
+  <interface name="org.freedesktop.DBus.Introspectable">
+    <method name="Introspect">
+      <arg name="data" direction="out" type="s"/>
+    </method>
+  </interface>
+  <interface name="org.freedesktop.Notifications">
+    <method name="CloseNotification">
+      <arg name="id" type="u" direction="in"/>
+    </method>
+    <method name="Notify">
+      <arg name="app_name" type="s" direction="in"/>
+      <arg name="id" type="u" direction="in"/>
+      <arg name="icon" type="s" direction="in"/>
+      <arg name="summary" type="s" direction="in"/>
+      <arg name="body" type="s" direction="in"/>
+      <arg name="actions" type="as" direction="in"/>
+      <arg name="hints" type="a{sv}" direction="in"/>
+      <arg name="timeout" type="i" direction="in"/>
+      <arg name="return_id" type="u" direction="out"/>
+    </method>
+  </interface>
+</node>]=]
+    return "s", xml
+end
+end)
+
+-- listen for dbus notification requests
+dbus.request_name("org.freedesktop.Notifications")
+
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