#!/bin/sh
#
# This is the laptop mode tools polling daemon. It is used by the module
# battery-level-polling to periodically let laptop mode tools run and check
# the battery levels.

# This copy was modified to call laptop_mode only when the battery is 
# very low. Calling laptop_mode every few minutes does not save much 
# power, lets not do any reads or writes to the disk until it's time.

BAT="BAT0"     # ACPI battery to monitor
LIMIT="200"    # Alarm if battery level drops below this value  (in mAh/mWh)
INTERVAL="150" # Seconds between each battery level check
HIBERNATE="/usr/sbin/pm-hibernate"      # Command to execute on low BAT level
#HIBERNATE="/usr/sbin/laptop_mode auto" # Command to execute on low BAT level

while ( true ) ; do
        sleep $INTERVAL

        # Don't terminate during the call to laptop_mode; wait until afterwards
        # to keep a stable situation.
        MUSTQUIT=0
        trap 'MUSTQUIT=1' TERM QUIT
        
        STATE=$(/bin/sed -ne "/charging state:/{s/^charging state:[ ]*\([a-zA-Z]*\)$/\1/p;q}" /proc/acpi/battery/$BAT/state)
        BATTERY=$(/bin/sed -ne "/remaining capacity:/{s/^remaining capacity:[ ]*\([0-9]*\) m[WA]h$/\1/p;q}" /proc/acpi/battery/$BAT/state)
        if [ "$BATTERY" -lt "$LIMIT" ] && [ "$STATE" = "discharging" ]; then
                exec "$HIBERNATE"
        fi
        
        if [ $MUSTQUIT -eq 1 ] ; then
                exit 0
        fi              
        trap - TERM
done