bridge

#!/bin/bash

pid=0
filestart="./start.js"
filetest="./test.js"

usage () {
	echo "Flower Bridge: See Flowers fall on the bridge"
	echo "Every 15 minutes (default), all of your Flower Power will be update"
	echo
	echo "USAGE: ./bridge cmd [delay]"
	echo
	echo "ARGUMENTS:"
	echo "	cmd:"
	echo "		display:	Lannch and show updating into your console"
	echo "		background:	Launch updatind to background. To know what happening: \`$ ./updatedb\`"
	echo "		restart:	Stop the current program and re-launch. If no program is running, 'restart' is similar as 'background'"
	echo "		status:		Show if the program is running or not"
	echo "		stop: 		Stop all processings and kill the program"
	echo
	echo "	delay (optional):"
	echo "		Specify the loop time in minute"
	echo
	echo "EXAMPLES:"
	echo "	./bridge display		: (loop every 15 minutes)"
	echo "	./bridge display 60		: (loop every 1 hour)"
	echo "	./bridge background 1440	: (loop every day without render in console)"
	echo "	./bridge stop			: (Stop the program)"
	echo "	./bridge restart		: (Restart the program)"
	echo
	echo "AUTHOR:"
	echo "	Written by Bruno Sautron."
}

welcome () {
	echo
	echo "-- Flower Bridge --"
	echo
}

pidexist () {
	kill -0 $1 2> /dev/null
}

isrunning () {
	pid=$(head -n 1 ".flowerIsRunning" 2> /dev/null)
	if [ -z "$pid" ]
	then
		return 1
	else
		pidexist $pid
		if [ "$?" == 0 ]
		then
			return 0
		fi
		return 1
	fi
}

statusit () {
	isrunning
	if [ "$?" == 0 ]
	then
		echo "[$pid] A program is running"
	else
		echo "No program is running"
	fi
}

displayit () {
	welcome
	isrunning
	if [ "$?" == 1 ]
	then
		node $1 $2
	else
		echo "[$pid]: A program was already running"
		stopit
		node $1 $2
	fi
}

backgroundit () {
	welcome
	isrunning
	if [ "$?" == 1 ]
	then
		node $1 $2 2> trace.log 1> /dev/null &
		echo $! > ".flowerIsRunning"
		echo "To see your log:"
		echo "$> ./updatedb"
	else
		echo "[$pid]: A program is already running"
	fi
}

stopit () {
	isrunning
	if [ "$?" == 1 ]
	then
		echo "No program is running"
	else
		killit
		echo "Bye :)"
	fi
}

restartit () {
	stopit
	backgroundit $1 $2
}

killit () {
	kill $pid
	rm -f ".flowerIsRunning"
	echo "kill" $pid
	pid=0
}

if [ -z "$1" ]
then
	usage
else
	if [ "$1" == "display" ]
	then
		displayit $filestart $2
	elif [ "$1" == "background" ]
	then
		backgroundit $filestart $2
	elif [ "$1" == "stop" ]
	then
		stopit
	elif [ $1 == "restart" ]
	then
		restartit $filestart $2
	elif [ $1 == "running" ]
	then
		isrunning
	elif [ $1 == "status" ]
	then
		statusit
	elif [ $1 == "test" ]
	then
		displayit $filetest $2
	else
		usage
	fi
fi