bash version of acpi

acpi.sh

#!/bin/bash -
#
# SCRIPT: aacpi
# AUTHOR: Luciano D. Cecere
# DATE: 2014
#
########################################################################
#
# acpi - show laptop battery information
# Copyright (C) 2014 Luciano D. Cecere <ldante86@aol.com>
#
# 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, see <http://www.gnu.org/licenses/>.
#
#########################################################################

export PATH=/bin:/usr/bin
unalias -a
set -e

PROGRAM="${0##*/}"

case $1 in
	-h|--help)
		echo "\
  Usage: ${PROGRAM} [OPTION]

        -a      show adapter info
        -h      show this help and exit
        -i      show battery details
        -V      show all battery details
"
		exit 0
		;;
esac

PROC=/proc/acpi
if [ ! -d ${PROC} ]; then
	echo Battery information is not available.
	echo ${PROC} cannot be found.
	exit 1
fi

AC_ADAPTER=${PROC}/ac_adapter/ACAD/state
BATTERY_STATE=${PROC}/battery/BAT*/state
BATTERY_INFO=${PROC}/battery/BAT*/info

AC_STATE=$(cat $AC_ADAPTER | cut -d":" -f 2 | sed 's/^ *//')
REMAING_CAPACITY=$(cat $BATTERY_STATE | grep -i remaining | tr -d 'a-zA-Z: ')
PRESENT_RATE_OF_DISCHARGE=$(cat $BATTERY_STATE | grep -i rate | tr -d 'a-zA-Z: ')
LAST_FULL_CAPACITY=$(cat $BATTERY_INFO | grep -i last | tr -d 'a-zA-Z: ')

SECONDS_IN_DAY=86400
SECONDS_IN_HOUR=3600
MINUTES_IN_HOUR=60
SECONDS_IN_MINUTE=60

((CURRENT_BATTERY_PERCENTAGE=REMAING_CAPACITY*100/LAST_FULL_CAPACITY))

_show_battery_info()
{
	case $AC_STATE in
	  on-line)
		if ((CURRENT_BATTERY_PERCENTAGE==100)); then
			echo Battery 0: Full, ${CURRENT_BATTERY_PERCENTAGE}%
		else
			SECONDS=$((3600*(LAST_FULL_CAPACITY-REMAING_CAPACITY)/PRESENT_RATE_OF_DISCHARGE))

			printf "%s %02d:%02d:%02d %s\n" \
				"Battery 0: Charging, ${CURRENT_BATTERY_PERCENTAGE}%," \
				"$((SECONDS/SECONDS_IN_HOUR))" \
				"$(((SECONDS/MINUTES_IN_HOUR)%MINUTES_IN_HOUR))" \
				"$((SECONDS%SECONDS_IN_MINUTE))" \
				"until charged"
		fi
	           ;;
	 off-line)
		SECONDS=$((3600*REMAING_CAPACITY/PRESENT_RATE_OF_DISCHARGE))

		printf "%s %02d:%02d:%02d %s\n" \
			"Battery 0: Discharging, ${CURRENT_BATTERY_PERCENTAGE}%," \
			"$((SECONDS/SECONDS_IN_HOUR))" \
			"$(((SECONDS/MINUTES_IN_HOUR)%MINUTES_IN_HOUR))" \
			"$((SECONDS%SECONDS_IN_MINUTE))" \
			"remaining"
	            ;;
esac
}

_show_battery_details()
{
	CAPACITY=$(cat $BATTERY_INFO | grep -i 'design capacity:' | tr -d 'a-zA-Z: ')
	LF_CAPACITY=$(cat $BATTERY_INFO | grep -i last )
	CAPACITY=$(bc <<< "scale=2 ; $LAST_FULL_CAPACITY/$CAPACITY" | tr -d .)
	DESIGN_CAPACITY=$(cat $BATTERY_INFO | grep -i 'design capacity:')
}

case $1 in
	-a|--ac-adapter)
		echo Adapter 0: $AC_STATE
		;;

	-i|--details)
		_show_battery_info
		_show_battery_details
		echo Battery 0: ${DESIGN_CAPACITY}, ${LF_CAPACITY} = ${CAPACITY}%

		;;

	-V|--everything)
		_show_battery_info
		cat $AC_ADAPTER
		cat $BATTERY_STATE
		cat $BATTERY_INFO
		;;

	*)
		_show_battery_info
		;;
esac