ObLobat - Send a DBus notification on low battery

ob-lobat.py

#!/usr/bin/env python3
""" Send a DBus notification on low battery.

Install Dependencies:
  $ sudo apt-get install libdbus-glib-1-dev
  $ sudo pip3 install batinfo python-daemon dbus-python notify2
"""

import subprocess
import sys
import time

import batinfo
import daemon
import notify2


NOTIF_NAME = "ob-lobat"
NOTIF_TITLE = "ObLobat"
NOTIF_LABEL_FMT = "Low battery: {perc}%"

BATTERY_ALERT = 10  # Percentage limit, send a notification when equal or below
CHECK_RATE = 60     # In seconds


def main():
    notify2.init(NOTIF_NAME)
    if len(sys.argv) >= 2 and sys.argv[1] == "-d":
        with daemon.DaemonContext():
            start_monitoring()
    else:
        start_monitoring()

def start_monitoring():
    while True:
        battery_perc = get_battery_perc()
        if battery_perc is not None and battery_perc <= BATTERY_ALERT:
            send_notification(battery_perc)
        time.sleep(CHECK_RATE)

def get_battery_perc():
    batteries = batinfo.Batteries()
    if not batteries or not batteries.stat:
        return None
    main_battery = batteries.stat[0]
    return main_battery.capacity

def send_notification(battery_perc):
    notification = notify2.Notification(
        NOTIF_TITLE, NOTIF_LABEL_FMT.format(perc=battery_perc)
    )
    notification.show()


if __name__ == "__main__":
    main()