Script: notification.py

WARNING: this script has been disabled (not compatible with Python 3).

Notify events through desktop notifications and an optional status icon.
Author: Guido Berhoerster — Version: 1 — License: GPL3
For WeeChat ≥ 1.0, requires: PyGTK, notify-python for the GTK 2 UI; GObject Introspection bindings for glib, GDK-PixBuf, GTK 3, libnotify for the GTK 3 UI; PyQt4 for the Qt 4 UI; PyQt4, PyKDE 4 for the KDE 4 UI.
Tags: notify, py2
Added: 2017-05-08

Download GitHub Repository

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
#
# Copyright (C) 2014 Guido Berhoerster <guido+weechat@berhoerster.name>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#

import os
import sys
import time
import re
import select
import signal
import errno
import fcntl
import cgi
import multiprocessing


SCRIPT_NAME = 'notification'
APPLICATION = 'Weechat'
VERSION = '1'
AUTHOR = 'Guido Berhoerster'
COPYRIGHT = '(C) 2014 Guido Berhoerster'
SUBTITLE = 'Notification Plugin for Weechat'
HOMEPAGE = 'https://code.guido-berhoerster.org/addons/weechat-scripts/weechat-notification-script/'
EMAIL = 'guido+weechat@berhoerster.name'
DESCRIPTION = 'Notifies of a number of events through desktop notifications ' \
        'and an optional status icon'
DEFAULT_SETTINGS = {
    'status_icon': ('weechat', 'path or name of the status icon'),
    'notification_icon': ('weechat', 'path or name of the icon shown in '
            'notifications'),
    'preferred_toolkit': ('', 'preferred UI toolkit'),
    'notify_on_displayed_only': ('on', 'only notify of messages that are '
            'actually displayed'),
    'notify_on_privmsg': ('on', 'notify when receiving a private message'),
    'notify_on_highlight': ('on', 'notify when a messages is highlighted'),
    'notify_on_dcc_request': ('on', 'notify on DCC requests')
}
BUFFER_SIZE = 1024


class NetstringParser(object):
    """Netstring Stream Parser"""

    IN_LENGTH = 0
    IN_STRING = 1

    def __init__(self, on_string_complete):
        self.on_string_complete = on_string_complete
        self.length = 0
        self.input_buffer = ''
        self.state = self.IN_LENGTH

    def parse(self, data):
        self.input_buffer += data
        ret = True
        while ret:
            if self.state == self.IN_LENGTH:
                ret = self.parse_length()
            else:
                ret = self.parse_string()

    def parse_length(self):
        length, delimiter, self.input_buffer = self.input_buffer.partition(':')
        if not delimiter:
            return False
        try:
            self.length = int(length)
        except ValueError:
            raise SyntaxError('Invalid length: %s' % length)
        self.state = self.IN_STRING
        return True

    def parse_string(self):
        input_buffer_len = len(self.input_buffer)
        if input_buffer_len < self.length + 1:
            return False
        string = self.input_buffer[0:self.length]
        if self.input_buffer[self.length] != ',':
            raise SyntaxError('Missing delimiter')
        self.input_buffer = self.input_buffer[self.length + 1:]
        self.length = 0
        self.state = self.IN_LENGTH
        self.on_string_complete(string)
        return True


def netstring_encode(*args):
    return ''.join(['%d:%s,' % (len(element), element) for element in
            args])

def netstring_decode(netstring):
    result = []
    def append_result(data):
        result.append(data)
    np = NetstringParser(append_result)
    np.parse(netstring)
    return result

def dispatch_weechat_callback(*args):
    return weechat_callbacks[args[0]](*args)

def create_weechat_callback(method):
    global weechat_callbacks

    method_id = str(id(method))
    weechat_callbacks[method_id] = method
    return method_id


class Notifier(object):
    """Simple notifier which discards all notifications, base class for all
       other notifiers
    """

    def __init__(self, icon):
        flags = fcntl.fcntl(sys.stdin, fcntl.F_GETFL)
        fcntl.fcntl(sys.stdin, fcntl.F_SETFL, flags | os.O_NONBLOCK)

        self.parser = NetstringParser(self.on_command_received)

    def on_command_received(self, raw_command):
        command_args = netstring_decode(raw_command)
        if len(command_args) > 1:
            command = command_args[0]
            args = netstring_decode(command_args[1])
        else:
            command = command_args[0]
            args = []
        getattr(self, command)(*args)

    def notify(self, summary, message, icon):
        pass

    def reset(self):
        pass

    def run(self):
        poll = select.poll()
        poll.register(sys.stdin, select.POLLIN | select.POLLPRI)

        while True:
            try:
                events = poll.poll()
            except select.error as e:
                if e.args and e.args[0] == errno.EINTR:
                    continue
                else:
                    raise e
            for fd, event in events:
                if event & (select.POLLIN | select.POLLPRI):
                    buffer_ = os.read(fd, BUFFER_SIZE)
                    if buffer_ != '':
                        self.parser.parse(buffer_)
                if event & (select.POLLERR | select.POLLHUP | select.POLLNVAL):
                    sys.exit(1)


class Gtk2Notifier(Notifier):
    """GTK 2 notifier based on pygtk and pynotify"""

    def __init__(self, icon):
        super(Gtk2Notifier, self).__init__(icon)

        pynotify.init(APPLICATION)

        gobject.io_add_watch(sys.stdin, gobject.IO_IN | gobject.IO_PRI,
                self.on_input)

        if not icon:
            icon_name = None
            icon_pixbuf = None
        elif icon.startswith('/'):
            icon_name = None
            try:
                icon_pixbuf = gtk.gdk.Pixbuf.new_from_file(icon)
            except gobject.GError:
                icon_pixbuf = None
        else:
            icon_name = icon
            icon_pixbuf = None

        if icon_name or icon_pixbuf:
            self.status_icon = gtk.StatusIcon()
            self.status_icon.set_title(APPLICATION)
            self.status_icon.set_tooltip_text(APPLICATION)
            self.status_icon.connect('activate', self.on_activate)
            if icon_name:
                self.status_icon.set_from_icon_name(icon_name)
            elif icon_pixbuf:
                self.status_icon.set_from_pixbuf(icon_pixbuf)
        else:
            self.status_icon = None

    def on_input(self, fd, cond):
        if cond & (gobject.IO_IN | gobject.IO_PRI):
            try:
                buffer_ = os.read(fd.fileno(), BUFFER_SIZE)
                if buffer_ != '':
                    self.parser.parse(buffer_)
            except EOFError:
                gtk.main_quit()
                return False

        if cond & (gobject.IO_ERR | gobject.IO_HUP):
            gtk.main_quit()
            return False

        return True

    def on_activate(self, widget):
        self.reset()

    def on_notification_closed(self, notification):
        if notification.get_closed_reason() == 2:
            self.reset()

    def notify(self, summary, message, icon):
        if self.status_icon:
            self.status_icon.set_tooltip_text('%s: %s' % (APPLICATION,
                    summary))
            self.status_icon.set_blinking(True)

        if icon and icon.startswith('/'):
            icon_name = None
            try:
                icon_pixbuf = gtk.gdk.Pixbuf.new_from_file(icon)
            except gobject.GError:
                icon_pixbuf = None
        else:
            icon_name = icon
            icon_pixbuf = None

        if 'body-markup' in pynotify.get_server_caps():
            body = cgi.escape(message)
        else:
            body = message

        notification = pynotify.Notification(summary, body, icon_name)
        if icon_pixbuf is not None:
            notification.set_image_from_pixbuf(icon_pixbuf)
        notification.connect('closed', self.on_notification_closed)
        notification.show()

    def reset(self):
        if self.status_icon:
            self.status_icon.set_tooltip_text(APPLICATION)
            self.status_icon.set_blinking(False)

    def run(self):
        gtk.main()


class Gtk3Notifier(Notifier):
    """GTK3 notifier based on GObject Introspection Bindings for GTK 3 and
       libnotify
    """

    def __init__(self, icon):
        super(Gtk3Notifier, self).__init__(icon)

        Notify.init(APPLICATION)

        GLib.io_add_watch(sys.stdin, GLib.IO_IN | GLib.IO_PRI, self.on_input)

        if not icon:
            self.icon_name = None
            self.icon_pixbuf = None
        elif icon.startswith('/'):
            self.icon_name = None
            try:
                self.icon_pixbuf = GdkPixbuf.Pixbuf.new_from_file(icon)
            except GLib.GError:
                self.icon_pixbuf = None
        else:
            self.icon_name = icon
            self.icon_pixbuf = None

        if self.icon_name or self.icon_pixbuf:
            # create blank, fully transparent pixbuf in order to simulate
            # blinking
            self.blank_pixbuf = GdkPixbuf.Pixbuf.new(GdkPixbuf.Colorspace.RGB,
                    True, 8, 22, 22)
            self.blank_pixbuf.fill(0x00)

            self.blink_on = True
            self.blink_timeout_id = None

            self.status_icon = Gtk.StatusIcon.new()
            self.status_icon.set_title(APPLICATION)
            self.status_icon.set_tooltip_text(APPLICATION)
            self.status_icon.connect('activate', self.on_activate)
            self.update_icon()
        else:
            self.status_icon = None

    def on_input(self, fd, cond):
        if cond & (GLib.IO_IN | GLib.IO_PRI):
            try:
                self.parser.parse(os.read(fd.fileno(), BUFFER_SIZE))
            except EOFError:
                Gtk.main_quit()
                return False

        if cond & (GLib.IO_ERR | GLib.IO_HUP):
            Gtk.main_quit()
            return False

        return True

    def on_activate(self, widget):
        self.reset()

    def update_icon(self):
        if not self.blink_on:
            self.status_icon.set_from_pixbuf(self.blank_pixbuf)
        elif self.icon_name:
            self.status_icon.set_from_icon_name(self.icon_name)
        elif self.icon_pixbuf:
            self.status_icon.set_from_pixbuf(self.icon_pixbuf)

    def on_blink_timeout(self):
        self.blink_on = not self.blink_on
        self.update_icon()
        return True

    def on_notification_closed(self, notification):
        if notification.get_closed_reason() == 2:
            self.reset()

    def notify(self, summary, message, icon):
        if self.status_icon:
            self.status_icon.set_tooltip_text('%s: %s' % (APPLICATION,
                    summary))
            if self.blink_timeout_id is None:
                self.blink_timeout_id = GLib.timeout_add(500,
                        self.on_blink_timeout)

        if icon and icon.startswith('/'):
            icon_name = None
            try:
                icon_pixbuf = GdkPixbuf.Pixbuf.new_from_file(icon)
            except GLib.GError:
                icon_pixbuf = None
        else:
            icon_name = icon
            icon_pixbuf = None

        if 'body-markup' in Notify.get_server_caps():
            body = cgi.escape(message)
        else:
            body = message

        notification = Notify.Notification.new(summary, body, icon_name)
        if icon_pixbuf is not None:
            notification.set_image_from_pixbuf(icon_pixbuf)
        notification.connect('closed', self.on_notification_closed)
        notification.show()

    def reset(self):
        if self.status_icon:
            self.status_icon.set_tooltip_text(APPLICATION)
            if self.blink_timeout_id is not None:
                GLib.source_remove(self.blink_timeout_id)
                self.blink_timeout_id = None
                self.blink_on = True
                self.update_icon()

    def run(self):
        Gtk.main()


class Qt4Notifier(Notifier):
    """Qt 4 notifier"""

    def __init__(self, icon):
        super(Qt4Notifier, self).__init__(icon)

        signal.signal(signal.SIGINT, self.on_sigint)

        self.qapplication = QtGui.QApplication([])

        self.readable_notifier = QtCore.QSocketNotifier(sys.stdin.fileno(),
                QtCore.QSocketNotifier.Read)
        self.readable_notifier.activated.connect(self.on_input)
        self.readable_notifier.setEnabled(True)

        if not icon:
            self.icon = None
        elif icon.startswith('/'):
            self.icon = QtGui.QIcon(icon)
        else:
            self.icon = QtGui.QIcon.fromTheme(icon)

        if self.icon:
            # create blank, fully transparent pixbuf in order to simulate
            # blinking
            self.blank_icon = QtGui.QIcon()

            self.blink_on = True
            self.blinking_timer = QtCore.QTimer()
            self.blinking_timer.setInterval(500)
            self.blinking_timer.timeout.connect(self.on_blink_timeout)

            self.status_icon = QtGui.QSystemTrayIcon()
            self.status_icon.setToolTip(APPLICATION)
            self.update_icon()
            self.status_icon.setVisible(True)
            self.status_icon.activated.connect(self.on_activated)
            self.status_icon.messageClicked.connect(self.on_message_clicked)
        else:
            self.status_icon = None

    def on_sigint(self, signo, frame):
        self.qapplication.exit(0)

    def on_input(self, fd):
        try:
            self.parser.parse(os.read(fd, BUFFER_SIZE))
        except EOFError:
            self.qapplication.exit(1)

    def on_activated(self, reason):
        self.reset()

    def on_message_clicked(self):
        self.reset()

    def on_blink_timeout(self):
        self.blink_on = not self.blink_on
        self.update_icon()

    def update_icon(self):
        if not self.blink_on:
            self.status_icon.setIcon(self.blank_icon)
        else:
            self.status_icon.setIcon(self.icon)

    def notify(self, summary, message, icon):
        if self.status_icon:
            self.status_icon.setToolTip('%s: %s' % (APPLICATION,
                    cgi.escape(summary)))
            self.blinking_timer.start()
            if self.status_icon.supportsMessages():
                self.status_icon.showMessage(summary, message,
                        QtGui.QSystemTrayIcon.NoIcon)

    def reset(self):
        if self.status_icon:
            self.blinking_timer.stop()
            self.blink_on = True
            self.update_icon()
            self.status_icon.setToolTip(APPLICATION)

    def run(self):
        sys.exit(self.qapplication.exec_())


class KDE4Notifier(Notifier):
    """KDE 4 notifier based on PyKDE4"""

    def __init__(self, icon):
        super(KDE4Notifier, self).__init__(icon)

        signal.signal(signal.SIGINT, self.on_sigint)

        aboutData = kdecore.KAboutData(APPLICATION.lower(), '',
                kdecore.ki18n(APPLICATION), VERSION, kdecore.ki18n(SUBTITLE),
                kdecore.KAboutData.License_GPL_V3, kdecore.ki18n(COPYRIGHT),
                kdecore.ki18n (''), HOMEPAGE, EMAIL)
        kdecore.KCmdLineArgs.init(aboutData)
        self.kapplication = kdeui.KApplication()

        self.readable_notifier = QtCore.QSocketNotifier(sys.stdin.fileno(),
                QtCore.QSocketNotifier.Read)
        self.readable_notifier.activated.connect(self.on_input)
        self.readable_notifier.setEnabled(True)

        if not icon:
            icon_qicon = None
            icon_name = None
        elif icon.startswith('/'):
            icon_qicon = QtGui.QIcon(icon)
            icon_name = None
        else:
            icon_qicon = None
            icon_name = icon

        if icon_name or icon_pixmap:
            self.status_notifier = kdeui.KStatusNotifierItem(self.kapplication)
            self.status_notifier.setCategory(
                    kdeui.KStatusNotifierItem.Communications)
            if icon_name:
                self.status_notifier.setIconByName(icon_name)
                self.status_notifier.setToolTip(icon_name, APPLICATION,
                        SUBTITLE)
            else:
                self.status_notifier.setIconByPixmap(icon_qicon)
                self.status_notifier.setToolTip(icon_qicon, APPLICATION,
                        SUBTITLE)
            self.status_notifier.setStandardActionsEnabled(False)
            self.status_notifier.setStatus(kdeui.KStatusNotifierItem.Active)
            self.status_notifier.setTitle(APPLICATION)
            self.status_notifier.activateRequested.connect(
                    self.on_activate_requested)
        else:
            self.status_notifier = None

    def on_sigint(self, signo, frame):
        self.kapplication.exit(0)

    def on_input(self, fd):
        try:
            self.parser.parse(os.read(fd, BUFFER_SIZE))
        except EOFError:
            self.kapplication.exit(1)

    def on_activate_requested(self, active, pos):
        self.reset()

    def notify(self, summary, message, icon):
        if self.status_notifier:
            self.status_notifier.setToolTipSubTitle(cgi.escape(summary))
            self.status_notifier.setStatus(
                    kdeui.KStatusNotifierItem.NeedsAttention)

        if icon:
            if icon.startswith('/'):
                pixmap = QtGui.QPixmap.load(icon)
            else:
                pixmap = kdeui.KIcon(icon).pixmap(kdeui.KIconLoader.SizeHuge,
                        kdeui.KIconLoader.SizeHuge)
        else:
            pixmap = QtGui.QPixmap()
        kdeui.KNotification.event(kdeui.KNotification.Notification, summary,
                cgi.escape(message), pixmap)

    def reset(self):
        if self.status_notifier:
            self.status_notifier.setStatus(kdeui.KStatusNotifierItem.Active)
            self.status_notifier.setToolTipTitle(APPLICATION)
            self.status_notifier.setToolTipSubTitle(SUBTITLE)

    def run(self):
        sys.exit(self.kapplication.exec_())


class NotificationProxy(object):
    """Proxy object for interfacing with the notifier process"""

    def __init__(self, preferred_toolkit, status_icon):
        self.script_file = os.path.realpath(__file__)
        self._status_icon = status_icon
        self._preferred_toolkit = preferred_toolkit
        self.notifier_process_hook = None
        self.spawn_timer_hook = None
        self.next_spawn_time = 0.0

        self.spawn_notifier_process()

    @property
    def status_icon(self):
        return self._status_icon

    @status_icon.setter
    def status_icon(self, value):
        self._status_icon = value
        self.terminate_notifier_process()
        self.spawn_notifier_process()

    @property
    def preferred_toolkit(self):
        return self._preferred_toolkit

    @preferred_toolkit.setter
    def preferred_toolkit(self, value):
        self._preferred_toolkit = value
        self.terminate_notifier_process()
        self.spawn_notifier_process()

    def on_notifier_process_event(self, data, command, return_code, output,
            error_output):
        if return_code != weechat.WEECHAT_HOOK_PROCESS_RUNNING:
            if return_code == weechat.WEECHAT_HOOK_PROCESS_ERROR:
                error = '%sfailed to run notifier' % weechat.prefix("error")
            else:
                error = '%snotifier exited with exit status %d' % \
                        (weechat.prefix("error"), return_code)
            if output:
                error += '\nstdout:%s' % output
            if error_output:
                error += '\nstderr:%s' % error_output
            weechat.prnt('', error)
            self.notifier_process_hook = None
            self.spawn_notifier_process()
        return weechat.WEECHAT_RC_OK

    def on_spawn_timer(self, data, remaining):
        self.spawn_timer_hook = None
        if not self.notifier_process_hook:
            self.spawn_notifier_process()
        return weechat.WEECHAT_RC_OK

    def spawn_notifier_process(self):
        if self.notifier_process_hook or self.spawn_timer_hook:
            return

        # do not try to respawn a notifier more than once every ten seconds
        now = time.time()
        if long(self.next_spawn_time - now) > 0:
            self.spawn_timer_hook = \
                    weechat.hook_timer(long((self.next_spawn_time - now) *
                    1000), 0, 1, 'dispatch_weechat_callback',
                    create_weechat_callback(self.on_spawn_timer))
            return

        self.next_spawn_time = now + 10
        self.notifier_process_hook = \
                weechat.hook_process_hashtable(sys.executable, {'arg1':
                self.script_file, 'arg2': self.preferred_toolkit, 'arg3':
                self.status_icon, 'stdin': '1'}, 0,
                'dispatch_weechat_callback',
                create_weechat_callback(self.on_notifier_process_event))

    def terminate_notifier_process(self):
        if self.spawn_timer_hook:
            weechat.unhook(self.spawn_timer_hook)
            self.spawn_timer_hook = None
        if self.notifier_process_hook:
            weechat.unhook(self.notifier_process_hook)
            self.notifier_process_hook = None
        self.next_spawn_time = 0.0

    def send(self, command, *args):
        if self.notifier_process_hook:
            if args:
                weechat.hook_set(self.notifier_process_hook, 'stdin',
                        netstring_encode(netstring_encode(command,
                        netstring_encode(*args))))
            else:
                weechat.hook_set(self.notifier_process_hook, 'stdin',
                        netstring_encode(netstring_encode(command)))

    def notify(self, summary, message, icon):
        self.send('notify', summary, message, icon)

    def reset(self):
        self.send('reset')


class NotificationPlugin(object):
    """Weechat plugin"""

    def __init__(self):
        self.DCC_SEND_RE = re.compile(r':(?P<sender>\S+) PRIVMSG \S+ :'
                r'\x01DCC SEND (?P<filename>\S+) \d+ \d+ (?P<size>\d+)')
        self.DCC_CHAT_RE = re.compile(r':(?P<sender>\S+) PRIVMSG \S+ :'
                r'\x01DCC CHAT ')

        weechat.register(SCRIPT_NAME, AUTHOR, VERSION, 'GPL3', DESCRIPTION, '',
                '')

        for option, (value, description) in DEFAULT_SETTINGS.iteritems():
            if not weechat.config_is_set_plugin(option):
                weechat.config_set_plugin(option, value)
            weechat.config_set_desc_plugin(option, '%s (default: "%s")' %
                    (description, value))

        self.notification_proxy = NotificationProxy(
            weechat.config_get_plugin('preferred_toolkit'),
            weechat.config_get_plugin('status_icon'))

        weechat.hook_print('', 'irc_privmsg', '', 1,
                'dispatch_weechat_callback',
                create_weechat_callback(self.on_message))
        weechat.hook_signal('key_pressed', 'dispatch_weechat_callback',
                create_weechat_callback(self.on_key_pressed))
        weechat.hook_signal('irc_dcc', 'dispatch_weechat_callback',
                create_weechat_callback(self.on_dcc))
        weechat.hook_config('plugins.var.python.%s.*' % SCRIPT_NAME,
                'dispatch_weechat_callback',
                create_weechat_callback(self.on_config_changed))

    def on_message(self, data, buffer, date, tags, displayed, highlight,
            prefix, message):
        if weechat.config_get_plugin('notify_on_displayed_only') == 'on' and \
                int(displayed) != 1:
            return weechat.WEECHAT_RC_OK

        formatted_date = time.strftime('%H:%M', time.localtime(float(date)))
        if 'notify_private' in tags.split(',') and \
                weechat.config_get_plugin('notify_on_privmsg') == 'on':
            summary = 'Private message from %s at %s' % (prefix,
                    formatted_date)
            self.notification_proxy.notify(summary, message,
                    weechat.config_get_plugin('notification_icon'))
        elif int(highlight) == 1 and \
                weechat.config_get_plugin('notify_on_highlight') == 'on':
            summary = 'Highlighted message from %s at %s' % (prefix,
                    formatted_date)
            self.notification_proxy.notify(summary, message,
                    weechat.config_get_plugin('notification_icon'))

        return weechat.WEECHAT_RC_OK

    def on_dcc(self, data, signal, signal_data):
        if weechat.config_get_plugin('notify_on_dcc') != 'on':
            return weechat.WEECHAT_RC_OK

        matches = self.DCC_SEND_RE.match(signal_data)
        if matches:
            summary = 'DCC send request from %s' % matches.group('sender')
            message = 'Filname: %s, Size: %d bytes' % \
                    (matches.group('filename'), int(matches.group('size')))
            self.notification_proxy.notify(summary, message,
                    weechat.config_get_plugin('notification_icon'))
            return weechat.WEECHAT_RC_OK

        matches = self.DCC_CHAT_RE.match(signal_data)
        if matches:
            summary = 'DCC chat request from %s' % matches.group('sender')
            message = ''
            self.notification_proxy.notify(summary, message,
                    weechat.config_get_plugin('notification_icon'))
            return weechat.WEECHAT_RC_OK

        return weechat.WEECHAT_RC_OK

    def on_key_pressed(self, data, signal, signal_data):
        self.notification_proxy.reset()
        return weechat.WEECHAT_RC_OK

    def on_config_changed(self, data, option, value):
        if option.endswith('.preferred_toolkit'):
            self.notification_proxy.preferred_toolkit = value
        elif option.endswith('.status_icon'):
            self.notification_proxy.status_icon = value
        return weechat.WEECHAT_RC_OK


def import_modules(modules):
    for module_name, fromlist in modules:
        if fromlist:
            module = __import__(module_name, fromlist=fromlist)
            for identifier in fromlist:
                globals()[identifier] = getattr(module, identifier)
        else:
            globals()[module_name] = __import__(module_name)

def try_import_modules(modules):
    try:
        import_modules(modules)
    except ImportError:
        sys.exit(1)
    sys.exit(0)


if __name__ == '__main__':
    if sys.argv[0] == '__weechat_plugin__':
        # running as Weechat plugin
        import weechat

        weechat_callbacks = {}

        plugin = NotificationPlugin()
    elif len(sys.argv) == 3:
        # running as the notifier process
        preferred_toolkit = sys.argv[1]
        icon = sys.argv[2]

        # required modules for each toolkit
        toolkits_modules = {
            'gtk3': [
                ('gi.repository', [
                    'GLib',
                    'GdkPixbuf',
                    'Gtk',
                    'Notify'
                ])
            ],
            'gtk2': [
                ('pygtk', []),
                ('gobject', []),
                ('gtk', []),
                ('pynotify', [])
            ],
            'qt4': [
                ('PyQt4', [
                    'QtGui',
                    'QtCore'
                ])
            ],
            'kde4': [
                ('PyQt4', [
                    'QtGui',
                    'QtCore'
                ]),
                ('PyKDE4', [
                    'kdecore',
                    'kdeui'
                ])
            ],
            '': []
        }
        available_toolkits = []
        selected_toolkit = ''

        # find available toolkits by spawning a process for each toolkit which
        # tries to import all required modules and returns an exit status of 1
        # in case of an import error
        for toolkit in toolkits_modules:
            process = multiprocessing.Process(target=try_import_modules,
                    args=(toolkits_modules[toolkit],))
            process.start()
            process.join(3)
            if process.is_alive():
                process.terminate()
                process.join()
            if process.exitcode == 0:
                available_toolkits.append(toolkit)

        # select toolkit based on either explicit preference or the
        # availability of modules and the used desktop environment
        if preferred_toolkit:
            if preferred_toolkit in available_toolkits:
                selected_toolkit = preferred_toolkit
        else:
            if 'KDE_FULL_SESSION' in os.environ:
                # preferred order if running KDE4
                toolkits = ['kde4', 'qt4', 'gtk3', 'gtk2']
            else:
                # preferred order for all other desktop environments
                toolkits = ['gtk3', 'gtk2', 'qt4', 'kde4']
            for toolkit in toolkits:
                if toolkit in available_toolkits:
                    selected_toolkit = toolkit
                    break

        # import required toolkit modules
        import_modules(toolkits_modules[selected_toolkit])

        # run selected notifier
        if selected_toolkit == 'gtk3':
            notifier = Gtk3Notifier(icon)
        elif selected_toolkit == 'gtk2':
            notifier = Gtk2Notifier(icon)
        elif selected_toolkit == 'qt4':
            notifier = Qt4Notifier(icon)
        elif selected_toolkit == 'kde4':
            notifier = KDE4Notifier(icon)
        else:
            notifier = Notifier(icon)
        notifier.run()
    else:
        sys.exit(1)