shell script for Minecraft server management

mc_server.sh

#!/bin/bash
#
# Minecraft Server Script
#
# Author: Simon Lepel
# Version: 0.1 alpha
# License: GNU GPL
# Requirements: screen

# Configuration
################################################################################
 
MC_PATH=/home/mineblock/bukkit
MC_JAR=craftbukkit-0.0.1-SNAPSHOT.jar
MC_WORLD="mineblock"

ALOC_XMX=2048
ALOC_XMS=2048

BACKUP_PATH=$MC_PATH/backup

SCREEN_NAME=$MC_WORLD

################################################################################

COLOR_TEXT="\033[1;37m"
COLOR_RED="\033[0;31m"
COLOR_GREEN="\033[0;32m"
COLOR_YELLOW="\033[1;33m"
COLOR_NONE="\033[0m"

MSG_START="${COLOR_TEXT}Starting Minecraft server...${COLOR_NONE}"
MSG_STOP="${COLOR_TEXT}Stopping Minecraft server...${COLOR_NONE}"
MSG_ONLINE="${COLOR_TEXT}Minecraft server seems to be ${COLOR_GREEN}ONLINE${COLOR_TEXT}.${COLOR_NONE}"
MSG_OFFLINE="${COLOR_TEXT}Minecraft server seems to be ${COLOR_RED}OFFLINE${COLOR_TEXT}.${COLOR_NONE}"
MSG_HELP="${COLOR_TEXT}Usage: $0 { console | status | start | starthere | stop [now] | restart [now] }${COLOR_NONE}"
MSG_LEAVECONSOLE="${COLOR_TEXT}Press Ctrl-A,D to leave the console${COLOR_NONE}."
MSG_ANNOUNCE="${COLOR_TEXT}Minecraft ingame announcement: ${COLOR_YELLOW}%b${COLOR_NONE}"

ANNOUNCE_RESTART="Server wird neu gestartet."
ANNOUNCE_SHUTDOWN_COUNTDOWN="Stoppe Server in %b Sekunden."

mc_display() {
	screen -R $SCREEN_NAME
}

mc_start() {
	echo -e $MSG_START
	cd $MC_PATH
	screen -m -d -S $SCREEN_NAME java -Xincgc -Xmx${ALOC_XMX}M -Xms${ALOC_XMS}M -jar $MC_JAR
}

mc_stop() {
	if [ $p2 != "now" ]
	then
		s=30
		while [ $s -gt 0 ] 
		do
			mc_announce `printf "$ANNOUNCE_SHUTDOWN_COUNTDOWN" "$s"`
			s=`expr $s - 10`
			sleep 10
		done
	fi
	echo -e $MSG_STOP
	mc_command stop
}

mc_command() {
	screen -S $SCREEN_NAME -p 0 -X stuff "`printf "${*}\r"`"
}

mc_announce() {
	mc_command say ${*}
	echo -e "`printf "$MSG_ANNOUNCE" "${*}"`"
}

pause_anykey() {
	stty -echo
	read -n1 -p "(press any key to continue)"
	stty echo
	echo
}

if [ -e $MC_PATH/server.log.lck ]
then
	ONLINE=1
else
	ONLINE=0
fi

p1=${1-default}
p2=${2-deafult}

case $p1 in
	"console")
		if [ $ONLINE -eq 1 ]
		then
			echo -e $MSG_LEAVECONSOLE
			pause_anykey
			mc_display
		else
			echo -e "$MSG_OFFLINE"
		fi
		;;
	"status")
		if [ $ONLINE -eq 1 ]
		then
			echo -e $MSG_ONLINE
		else
			echo -e $MSG_OFFLINE
		fi
		;;
	"start")
		if [ $ONLINE -eq 1 ]
		then
			echo -e $MSG_ONLINE
		else
			mc_start
		fi
		;;
	"starthere")
		if [ $ONLINE -eq 1 ]
		then
			echo -e $MSG_ONLINE
		else
			cd $MC_PATH
			java -Xincgc -Xmx${ALOC_XMX}M -Xms${ALOC_XMS}M -jar $MC_JAR
		fi
		;;
	"stop")
		if [ $ONLINE -eq 1 ]
		then
			mc_stop
		else
			echo -e $MSG_OFFLINE
		fi
		;;
	"restart")
		if [ $ONLINE -eq 1 ]
		then
			mc_announce $ANNOUNCE_RESTART
			mc_stop
			echo "(waiting 5 seconds)"
			sleep 5
			mc_start
		else
			echo -e $MSG_OFFLINE
		fi
		;;
	*)
		echo -e $MSG_HELP
		;;
esac