#!/bin/sh

UPDATE_PERIOD=2 #seconds

notif_dirty=0
perform=0

# USR1 callback
function toggle_perform()
{
    let perform=1-${perform}
    if [ ${perform} -eq 0 ]; then
    	notif_clear
        notif_dirty=1
    fi
}
trap toggle_perform SIGUSR1

while true; do
    if [ ${perform} -eq 1 ]; then

	# Compute stats
	cpu=$(printf "%.1f\n" $(mpstat -P ALL $UPDATE_PERIOD 1 | tail -1 | awk '{print 100-$12}'))
	ram_mem=$(printf "%.1f\n" $(free | grep Mem | awk '{print $3/$2 * 100.0}'))
	ram_swap=$(printf "%.1f\n" $(free | grep Swap | awk '{print $3/$2 * 100.0}'))

	# Notif
	if [ ${notif_dirty} -eq 1 ]; then
	    notif_clear
	    notif_dirty=0
	else
	    notif_set 0 "CPU:${cpu}%% RAM:${ram_mem}%% SWAP:${ram_swap}%%"
	fi
    else
	sleep ${UPDATE_PERIOD}
    fi
done
exit 0
