#!/bin/bash

# example crontab entry:
# */5 *   * * *   mszczygiel /usr/local/bin/batcheck.sh

BAT_PATH="/sys/class/power_supply/BAT0"

ON_BATTERY=$(cat $BAT_PATH/status)
BATTERY_LEVEL=$(cat $BAT_PATH/charge_now)
BATTERY_FULL=$(cat $BAT_PATH/charge_full)
PERCENT=$(( $BATTERY_LEVEL * 100 / $BATTERY_FULL ))
MESSAGE="RUNNING OUT OF JUICE!!!"

if [ $PERCENT -le "15" ] && [ $ON_BATTERY == "Discharging" ]; then
        DISPLAY=:0 i3-nagbar -m "$(echo $MESSAGE)"
fi