GajimDBus: gajim2beryl.py

#!/usr/bin/python

# notification about new messages in
# gajim using the beryl water ripple effect
# Jan Vornberger (jav), xmpp:jav@jabber.de

import os
import gobject
import string
import re
import dbus

if getattr(dbus, 'version', (0,0,0)) >= (0,41,0):
    import dbus.glib

GAJIM_SERVICE = 'org.gajim.dbus'
GAJIM_OBJ_PATH = '/org/gajim/dbus/RemoteObject'
GAJIM_INTERFACE = 'org.gajim.dbus.RemoteInterface'

BERYL_SERVICE = 'org.freedesktop.beryl'
BERYL_OBJ_PATH = '/org/freedesktop/beryl/water/allscreens/point'
BERYL_INTERFACE = 'org.freedesktop.beryl.activate'

# function to find root window id;
# we will need to pass that to beryl
def get_root_window_id():
        rootid = 0
        idline = os.popen('xwininfo -root | grep "id:"').readlines()[0]
        idmatch = re.search('id: ([^ ]*)', idline)
        if (idmatch):
                rootid = int(idmatch.group(1), 16)
                return rootid
        else:
                raise 'Can not find window id of root window'

# function to find the position of gajim systray icon;
# we want to ping that position
def get_systray_icon_position():
        # find systray icon
        cmd = 'xwininfo  -root -tree | grep gajim'
        posregex = re.compile('(\d+)x(\d+)\+\d+\+\d+\s*\+(\d+)\+(\d+)') # match window position info

        for line in os.popen(cmd).readlines():
                posmatch = posregex.search(line)
                if (posmatch):
                        width = int(posmatch.group(1))
                        height = int(posmatch.group(2))
                        x = int(posmatch.group(3))
                        y = int(posmatch.group(4))
                        if (width >= 15 and width <= 30 and height >= 15 and height < 30):
                                # I guess this is the systray icon
                                return x + (width / 2), y

        raise 'Can not find gajim systray icon'

# callback function to be informed about new messages in gajim
def new_message(details):
        # new message -> ripple notification
        beryl_dbus_iface.activate('root', rootid,
                                        'amplitude', 1,
                                        'x', systray_x,
                                        'y', systray_y,
                                        reply_handler=(lambda *args: None),
                                        error_handler=(lambda *args: None))

# get root id and systray position for later use
rootid = get_root_window_id()
systray_x, systray_y = get_systray_icon_position()

# magic starts here
bus = dbus.SessionBus()

# connect to NewMessage signal from gajim
gajim_proxy_obj = bus.get_object(GAJIM_SERVICE, GAJIM_OBJ_PATH)
gajim_dbus_iface = dbus.Interface(gajim_proxy_obj, GAJIM_INTERFACE)
gajim_dbus_iface.connect_to_signal('NewMessage', new_message)

# prepare beryl dbus connection
beryl_proxy_obj = bus.get_object(BERYL_SERVICE, BERYL_OBJ_PATH)
beryl_dbus_iface = dbus.Interface(beryl_proxy_obj, BERYL_INTERFACE)

# get things going
mainloop = gobject.MainLoop()
mainloop.run()