#!/usr/bin/python

global DeviceName, AddAction, RemoveAction, bus, hal_manager

#DeviceName = 'usb_device_15ca_c3_noserial_if0_logicaldev_input'
DevicePattern = r'usb_device.*_input'
DeviceCap = 'input.mouse'
AddAction = '/usr/bin/gconftool --set --type=bool /desktop/gnome/peripherals/mouse/touchpad_enabled false'
RemoveAction = '/usr/bin/gconftool --set --type=bool /desktop/gnome/peripherals/mouse/touchpad_enabled true'

import dbus # needed to do anything
import dbus.decorators # needed to receive messages
import dbus.glib # needed to receive messages
import gobject # needed to loop & monitor
import os # needed to
import re, time

DeviceRe = re.compile(DevicePattern, re.IGNORECASE | re.DOTALL)

#@dbus.decorators.explicitly_pass_message
def add_device(*args, **keywords):
 Path = args[0].split('/')
 device_obj = bus.get_object('org.freedesktop.Hal', args[0])
 device = dbus.Interface(device_obj, dbus_interface = "org.freedesktop.Hal.Device")

 cap = device.QueryCapability(DeviceCap)

 if cap and DeviceRe.match(Path[-1]) :
     os.system(AddAction)
 
#@dbus.decorators.explicitly_pass_message
def remove_device(*args, **keywords):
 Path = args[0].split('/')
 try :
     device_obj = bus.get_object('org.freedesktop.Hal', args[0])
     device = dbus.Interface(device_obj, dbus_interface = "org.freedesktop.Hal.Device")
     cap = device.QueryCapability(DeviceCap)
 except :
     # assume true, since device might be already removed
     cap = True

 if cap and DeviceRe.match(Path[-1]) : # Device found
     os.system(RemoveAction)

bus = dbus.SystemBus()  # connect to system bus
hal_manager_obj = bus.get_object('org.freedesktop.Hal', '/org/freedesktop/Hal/Manager')
hal_manager = dbus.Interface(hal_manager_obj, 'org.freedesktop.Hal.Manager')

# Add listeners for all devices being added or removed
bus.add_signal_receiver(add_device, 'DeviceAdded', 'org.freedesktop.Hal.Manager',
                     'org.freedesktop.Hal', '/org/freedesktop/Hal/Manager')
bus.add_signal_receiver(remove_device, 'DeviceRemoved', 'org.freedesktop.Hal.Manager',
                     'org.freedesktop.Hal', '/org/freedesktop/Hal/Manager')

# Run remove action once to enable touchpad
os.system(RemoveAction)
time.sleep(1)

# Find mouse first
udis = hal_manager.FindDeviceByCapability('input.mouse')
for udi in udis :
 Path = udi.split('/')
 if DeviceRe.match(Path[-1]) : # Check if this is our prefer mouse
     os.system(AddAction)
     break # no need to keep looking

# monitor
loop = gobject.MainLoop()
loop.run()