#!/bin/sh

# get charging state
CHARGINGSTATE=`cat /proc/acpi/battery/BAT1/state | grep "charging state:" | sed -e "s/charging state:          //"`

# exit if AC adapter is present
if [ $CHARGINGSTATE == "charging" ]; then
  exit
fi

# get remaining capacity
REMAININGCAPACITY=`cat /proc/acpi/battery/BAT1/state | grep "[0-9] mAh" | sed -e "s/remaining capacity:      //" -e "s/ mAh//"`

# hibernate if remaining battery capacity is below 300 mAh
if [ $REMAININGCAPACITY -lt "300" ]; then
  /usr/local/sbin/hibernate
fi