Laptop battery status in a prompt

I found sometime ago very usefull script for showing laptop battery status in a terminal. As I dont like huge xmanagers (KDE and Gnome and...) and using fluxbox this script was real for me. But time run fast and now all acpi things are moved from procfs to sysfs. I bought used laptop on ebay and found this old script in my old hdd backup directory. Fix it for a little add bashrc sample and it's run again.




you can find latest copy on github
https://github.com/venik/gentoo-cfg/blob/master/scripts/battery_status.sh

[code]
# Battery status script
# Copyright (C) Basically Tech (??? dont know exactly)
# 2011 Alex Nikiforov nikiforov.pub@gmail.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 3 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 .

# I found it some time ago, but it was for old acpi in procfs
# based on http://www.basicallytech.com/blog/index.php?/archives/
# 110-Colour-coded-battery-charge-level-and-status-
# in-your-bash-prompt.html
#
# I update it for sysfs and add .bashrc. Works fine on Gentoo :]

# sample of the .bashrc
#BAT="[ \$(/path/to/the/scripts/battery_status.sh) ]"
#export PS1="$BAT \[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] "

#!/bin/bash
BATTERY=/sys/class/power_supply/BAT0/

REM_CAP=`cat $BATTERY/energy_now`
FULL_CAP=`cat $BATTERY/energy_full`
BATSTATE=`cat $BATTERY/status`

CHARGE=`echo $(( $REM_CAP * 100 / $FULL_CAP ))`

NON='\033[00m'
BLD='\033[01m'
RED='\033[01;31m'
GRN='\033[01;32m'
YEL='\033[01;33m'

COLOUR="$RED"

case "${BATSTATE}" in
'Charged')
BATSTT="$BLD=$NON"
;;
'Charging')
BATSTT="$BLD+$NON"
;;
'Discharging')
BATSTT="$BLD-$NON"
;;
esac

# prevent a charge of more than 100% displaying
if [ "$CHARGE" -gt "99" ]
then
CHARGE=100
fi

if [ "$CHARGE" -gt "15" ]
then
COLOUR="$YEL"
fi

if [ "$CHARGE" -gt "30" ]
then
COLOUR="$GRN"
fi

echo -e "${COLOUR}${CHARGE}%${NON} ${BATSTT}"

# end of file
[/code]