#!  /bin/bash
#An ACPI battery and AC-power status script.
#Requires /proc, ACPI support, bash, head, tail, sed, grep and wc. 
#Should now work on systems where battery isn't named BATx and adapter ACAD.
#Also works with batteries that don't report in mAh.
#NEW: Now supports multiple batteries.
#
# Author: gammy

checkdir () {
	if [ ! -d $1 ]; then
		echo "\"$1\" was not found! Exiting."
		exit 1
	fi
}

checkfile () {
	if [ ! -e $1 ]; then
		echo "\"$1\" was not found! Exiting."
		exit 1
	fi
}

checkdir /proc
checkdir /proc/acpi
checkdir /proc/acpi/battery

BATTERY=(`ls -1 /proc/acpi/battery/`)
NUMBATS=${#BATTERY[@]}
#echo "$NUMBATS batteries."

checkdir /proc/acpi/ac_adapter
ACDATA=(`ls -1 /proc/acpi/ac_adapter/`)
AC=${ACDATA[0]}
    
checkfile "/proc/acpi/ac_adapter/$AC/state"


if [ `grep "on-line" "/proc/acpi/ac_adapter/$AC/state" | wc -l` -eq 0 ]; then
    BATSTATUS="discharging."
else
    if [ $CURCAPACITY -eq $MAXCAPACITY ]; then
	BATSTATUS="charged."
    else
	BATSTATUS="charging."
    fi
fi

for((I = 0; I < $NUMBATS; I++)); do

    BAT=${BATTERY[$I]}

    checkdir "/proc/acpi/battery/$BAT"
    checkfile "/proc/acpi/battery/$BAT/info"
    checkfile "/proc/acpi/battery/$BAT/state"

    cd "/proc/acpi/battery/$BAT/"

    VALUETYPE=`head -n 3 info | tail -n 1 | cut -d " " -f 10`

    echo -n "$BAT: "

    if [ ! "$VALUETYPE" ]; then
    	echo "Not connected."
    else
	MAXCAPACITY=`head -n 3 info | tail -n 1 | cut -d " " -f 9`
	CURCAPACITY=`head -n 5 state | tail -n 1 | cut -d " " -f 8` 
        let PERCENT=100*$CURCAPACITY/$MAXCAPACITY
	echo "$PERCENT% ($CURCAPACITY $VALUETYPE) power, $BATSTATUS"
    fi

done