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#!/bin/sh
PREF=/sys/class/power_supply/BAT0
[ -r "${PREF}" ] || exit 1
BATTERY_STATUS=$(< ${PREF}/status)
typeset -i FULL_CAPACITY=$(< ${PREF}/charge_full)
typeset -i WARNING_CAPACITY=$(( ${FULL_CAPACITY} * 20 / 100 ))
typeset -i LOW_CAPACITY=$(( ${FULL_CAPACITY} * 10 / 100 ))
typeset -i REMAINING_CAPACITY=$(< ${PREF}/charge_now)
REMAINING_PERCENTAGE=$( echo "scale=1; ${REMAINING_CAPACITY} * 100 / ${FULL_CAPACITY}" |bc )
case "${BATTERY_STATUS}" in
'Full') # battery full
printf "AC"
;;
'Discharging') # battery discharging
printf "${REMAINING_PERCENTAGE}%%"
;;
'Charging') # battery charging
printf "AC^${REMAINING_PERCENTAGE}%%"
;;
esac
exit 0
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