#!/bin/bash

help () {
cat <<EOT

############################## chargecycle ################################
##  A script to be run while a battery powered computer goes through a   ##
##  charge or discharge cycle, chargecycle will output a timestamped     ##
##  snapshot of the battery's current charge state, one per line,        ##
##  every two minutes, until stopped by <Ctrl-C> or system shutdown.     ##
##  Output can be collected into logfiles to profile a battery.          ##      
##                                                                       ##
##  Usage: tty1$ chargecycle [-tT]                                       ##
##                                                                       ##
##    Options: -b show battery info only (default)                       ##
##    Options: -t show battery and thermal info                          ##
##    Options: -T show only thermal info                                 ##
##    Options: -h show this help message and exit                        ##
##                                                                       ##
##  Suggested usage: tty1$ chargecycle | tee chargelog.txt               ##
##                                                                       ##
###########################################################################

EOT
exit 0
}

## Initialize variable to default values, then parse command ine arguements.
arg=-b
help=0


while getopts :htTb opt
do case $opt in
        h ) help=1   ;;
       \? ) help=1   ;;
        b ) arg=-b   ;;
        t ) arg=-t   ;;
        T ) arg=-tB  ;;
    esac
done

## If -h flag is set post usage information and exit.
if [ $help = 1 ]
then help
fi

## Test if acpi is available, post error message and exit if not.
if [ ! $(which acpi 2>/dev/null) ]  
then echo "Advanced Configuration Power Interface (acpi) program or kernel module not installed."
     exit 1
fi

## Test if a battery is present, post error message and exit if not.
if (acpi -b  2>&1 | grep "No support for device type: battery" >/dev/null )
then echo "chargecycle: This system has no battery. Running this program makes no sense here."
     exit 
fi

## Commence loop to get and time stamped report acpi information.
while true
do echo -n "$(date +%m-%d-%Y-%T) "
   echo $(acpi $arg)| sed s/information/info/g 
   sleep 120;
done