battery.sh

#! /bin/bash

SLEEP_TIME=5   # Default time between checks.
SAFE_PERCENT=30  # Still safe at this level.
DANGER_PERCENT=20  # Warn when battery at this level.
CRITICAL_PERCENT=5  # Hibernate when battery at this level.

NAGBAR_PID=0
export DISPLAY=:0.0

while [ true ]; do

    if [[ -n $(acpi -b | grep -i discharging) ]]; then
        rem_bat=$(acpi -b | grep -Eo "[0-9]+%" | grep -Eo "[0-9]+")

        if [[ $rem_bat -gt $SAFE_PERCENT ]]; then
            SLEEP_TIME=10
        else
            SLEEP_TIME=5
            if [[ $rem_bat -le $DANGER_PERCENT ]]; then
                SLEEP_TIME=2
                twmnc -c "Батарея садится"
            fi
        fi
    else
        SLEEP_TIME=10
    fi

    sleep ${SLEEP_TIME}m

done