WorkSaver.py

#!/usr/bin/env python

import subprocess

apps_to_save = ['Gedit', 'Writer']

battery_limit = 10  # in percent

def get_battery_percentage():

    percentage, err = subprocess.Popen([r'upower -i $(upower -e | grep BAT) | grep --color=never -E percentage | xargs | cut -d ' ' -f2 | sed s/%//
'], shell=True, stdout=subprocess.PIPE).communicate()

    return(int(percentage))

while True:

    if get_battery_percentage() <= battery_limit:

        for app in apps_to_save:

            app_window_ids = subprocess.Popen(['xdotool', 'search', '--class', app],
            stdout=subprocess.PIPE)

            out, err = app_window_ids.communicate()

            for app_window_id in out.splitlines():

                subprocess.Popen(['xdotool', 'windowactivate', app_window_id,
                ';', 'xdotool', 'key', 'ctrl+s'], shell=True)