#!/bin/bash
#
# Print battery status/percentage
#
# Copyright (C) 2010 W. Trevor King <wking@drexel.edu>
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

for i in $(seq 0 9); do
  BAT="BAT${i}"
  SYSPATH="/sys/class/power_supply/$BAT"
  if [ -d "${SYSPATH}" ]; then
    break
  fi
done

if [ ! -d "${SYSPATH}" ]; then
  echo "No battery found in $(dirname "${SYSPATH}")"
  exit 1
fi

STATUS=$(cat "$SYSPATH/status")
CAPACITY=$(cat "$SYSPATH/charge_full")
LEVEL=$(cat "$SYSPATH/charge_now")
PERCENT=$(python -c "print($LEVEL * 100. / $CAPACITY)")

echo -e "$BAT\t$STATUS\t$LEVEL/$CAPACITY ($PERCENT%)"