#! /bin/sh

exception()
{
	echo -n -e '\e[0m'
	flock -u 200 &>/dev/null
	exit
}

trap exception EXIT SIGINT SIGTERM SIGQUIT

column="$1"
row="$2"
label="$3"
prehook="$4"
cmd="$5"
posthook="$6"

while :
do
	(
		flock -e 200

		echo -n -e "\e[$row;${column}H\e[7m $label \e[0m"

		flock -u 200

		if [ -n "$prehook" ]
		then
			$prehook
		fi

		$cmd &>/dev/null

		ecode=$?

		flock -e 200

		echo -n -e "\e[$row;${column}H"

		if [ $ecode -eq 0 ]
		then
			echo -n -e "\e[42;32;1m"
		else
			echo -n -e "\e[41;31;1m"
		fi

		echo -n -e " $label \e[0m"

		flock -u 200

		if [ -n "$posthook" ]
		then
			$posthook
		fi

	) 200>/tmp/lock
done