--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/notification.py	Tue Mar 10 11:27:22 2015 +0100
@@ -0,0 +1,852 @@
+#
+# 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 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.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 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.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)
+        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_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)