#!/bin/sh
#
#   battery-monitor
#   Written By: Dean Jones <dean at cleancode dot org>
#
#   Monitors the battery status via APM and spits the
#   results out via osd_cat
#   
#   If the battery is over 20%, display is in Grey, else 
#   If the battery is over 10%, display is in Yellow, else
#   If the battery is over  5%, display is in Orange Red, else
#   If the battery is under 5%, display is in Red.
#
#   If you have the osd_cat binary in a strange area,
#   You can specify the full path in the variable
#   OSD_CAT (below), or put the path to it in $PATH
#
#   If you do not have the JMK Neep font, you can change
#   the FONT variable (below) to the font you'd like to use.  
#

OSD_CAT=
FONT="neep-14"
level=
percent=
ac_online=
time=

# Figure out what Color to display with osd_cat 
# by considering the percent level

osd_print ()
{
    color=
    refresh=

    case "$percent" in
        [0-5]%) 
            color="red" 
            refresh=60
            ;;

        [6-10]%) 
            color="orange red" 
            refresh=90
            ;;

        [11-20]%) 
            color="yellow"
            refresh=120
            ;;

        *) 
            color="gray"
            refresh=180
            ;;
    esac 

    echo "Battery Status: $ac_online $level $percent"  |
        "$OSD_CAT" -f "$FONT" -p bottom -A right -d "$refresh" -c "$color" -o -15
}
    
# Set the level name based on the percent of the
# battery life that is left.
#
#      < 0, No Battery
#    0 - 5, Critical
#   6 - 19, Low
# 20 - 100, High
#
# If AC is online and battery is less than 100%
# level should be "Charging"

set_level ()
{
    if   [ -z "$percent" ]
    then
        level="No Battery"
    elif [ "$ac_online" ] && [ "$percent" != "100%" ]
    then
        level="CHARGING,"
    else
        case "$percent" in
            [0-5]%) level="CRITICAL,";;
           [6-19]%) level="LOW,";;
                 *) level="HIGH,";;
        esac
    fi
}

# First check to make sure they have osd_cat
test -z ${OSD_CAT:=`which osd_cat 2> /dev/null`} &&
    echo "Error: Can't find osd_cat. Please make sure it's in your \$PATH" && 
    exit

# This is our main loop
while apmstat=(`cat /proc/apm`)
do
    # 0x01 means an AC cord is attached.
    if [ "${apmstat[3]}" = "0x01" ]
    then
        ac_online="AC Online,"
    fi

    # -1% means no battery, no percent to display
    if [ "${apmstat[6]}" != "-1%" ]
    then
        percent="${apmstat[6]}"
    fi

    set_level
    osd_print
done