log-notifications

#!/usr/bin/python3
#
# A small script that logs notifications to nominated file (or to stdout)
#
# noup python <this script> > ~/tmp/notifications.log &
#
# TODO:
# -d options to run as Daemon under init
# -a argument for append, else starts fresh
#
# On hold: Worked on a bash version instead to avoid the Python dependency. 
# And that is now implemented as nlog with systemd support.

import sys, dbus, textwrap
from dbus.mainloop.glib import DBusGMainLoop
from gi.repository import GLib

logfile = sys.stdout


def msg_cb(bus, msg):
    args = msg.get_args_list()
    logfile.write(f"Notification from '{args[0]}'" + '\n')
    for l in textwrap.wrap(f"Summary: {args[3]}", initial_indent='\t', subsequent_indent='\t\t'): logfile.write(l + '\n')
    for l in textwrap.wrap(f"Body: {args[4]}", initial_indent='\t', subsequent_indent='\t\t'): logfile.write(l + '\n')
    logfile.flush()


if __name__ == '__main__':
    try:
        if len(sys.argv) > 1:
            logfilename = sys.argv[1]
            logfile = open(logfilename, "a")

        DBusGMainLoop(set_as_default=True)
        bus = dbus.SessionBus()

        string = "interface='org.freedesktop.Notifications',member='Notify',eavesdrop='true'"
        bus.add_match_string(string)
        bus.add_message_filter(msg_cb)

        mainloop = GLib.MainLoop ()
        mainloop.run ()
    except:
        logfile.close()