batnotify

#!/bin/python

import subprocess, time
target = 100
step = 5
cur_target = target
while True:
    if "Discharging" in str(subprocess.check_output(["cat", "/sys/class/power_supply/BAT0/status"])):
            aux = subprocess.check_output(["acpi"])
            acpi_res = aux.split()
            n = len(acpi_res[3])

            battery_level = int(acpi_res[3][:n-2])
            if battery_level <= cur_target:
                message = "Battery is low! " + str(battery_level) + "% left!"
                subprocess.call(["notify-send", "-u", "critical", "-t", "5000", message])
                cur_target = min(cur_target - step, battery_level - step)
                subprocess.call(["echo", str(cur_target)])
    else:
        cur_target = target
        subprocess.call(["echo", str(cur_target)])
    time.sleep(30)