#!/bin/bash


#    batterycheck.sh
#    Checks your laptop battery state...
#    Warning for low capacity and shutdown the system when the battery is
#    totally discharged
#
#    Version 0.1 
#    05-Jan-2005
#
#     Copyright (C) 2005  substa
#    <substa at freaknet dot org>
#    
#
#
#    License:
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful, but
#    WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#    General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software Foundation,
#    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#




###############################################
# Change it according to your system settings #
###############################################

STATE='/proc/acpi/battery/BAT1/state'
SHUTDOWN=/sbin/halt
LOGGER='/usr/bin/logger -t batterycheck '
OSDCTL=/usr/local/bin/osdctl
BEEP=/usr/bin/beep
LOW=5000            #first warning
LOWER=2000	    #second warning
TOO_LOW=800	    #shutdown the system

###############################################




ACTUAL='NORMAL'

while (true) do

CHARGE=`grep -e charging $STATE | awk '{print $3}' -`
CAPACITY=`grep -e remaining $STATE | awk '{print $3}' -`
XCONTROL=`ps -a | grep xinit | awk '{print $4}'`

if [ $CHARGE = 'charging' ]
then
	if [ $ACTUAL != 'NORMAL' ]
	then
		ACTUAL='NORMAL'
	fi

    	sleep 60s
	
else 
	if [ $CHARGE = 'discharging' ]
	then
		if [ $CAPACITY -lt $LOW ] && [ $ACTUAL == 'NORMAL' ] 
		then
			ACTUAL='LOW'
			$LOGGER Battery discharging: low capacity

			if [ "$XCONTROL" = 'xinit' ]; then
				$BEEP -f 1000 -n -f 2000 -n -f 1500
				$OSDCTL -s "Battery discharging, low capacity"
		  	else	
				   wall "Battery discharging: low capacity"
			fi

		fi

		if [ $CAPACITY -lt $LOWER ] && [ $ACTUAL != 'LOWER' ]
		then
			ACTUAL='LOWER'
		    	
			$LOGGER Battery discharging: very low capacity

			if [ "$XCONTROL" = 'xinit' ]; then
				$BEEP -f 1000 -n -f 2000 -n -f 1500
				sleep 0.5s
				$BEEP -f 1000 -n -f 2000 -n -f 1500
				$OSDCTL -s "Battery discharging, very low capacity, SAVE YOUR WORKS"
			else 
			        wall "Battery discharging: very low capacity, SAVE YOUR WORKS"
			fi

		fi

		if [ $CAPACITY -lt $TOO_LOW ]
		then
			$LOGGER Battery discharged: Shutting system down

			 if [ "$XCONTROL" = 'xinit' ]; then
			 	$BEEP -f 1000 -n -f 500 -n -f 250 -n -f 120
			 	$OSDCTL -s "Battery discharged, SHUTTING SYSTEM DOWN"
			 else
			        wall "Battery discarged: Shutting system down"
			 fi	

			 $SHUTDOWN
		fi
               
	        if [ $ACTUAL == 'NORMAL' ]
		then
			sleep 60s
		else
			if [ $ACTUAL == 'LOW' ]
			then
				sleep 30s
			else
				sleep 15s
			fi
		fi
		
	else
		$LOGGER Battery state not defined
		exit
	fi
fi

done