msm/msm

#!/bin/bash

### BEGIN INIT INFO
# Provides:	  msm
# Required-Start: $local_fs $remote_fs
# Required-Stop:  $local_fs $remote_fs
# Should-Start:	  $network
# Should-Stop:	  $network
# Default-Start:  2 3 4 5
# Default-Stop:	  0 1 6
# Short-Description:	
# Description:	  
### END INIT INFO


# See http://www.debian.org/doc/debian-policy/ch-opersys.html#s-sysvinit for
# more information on debain init.d scripts, which may help you understand
# this script.


### The configuration file
CONFIG="/etc/msm.conf"


### Config variables the user should need/want to change

# Jar group file which contains the download target URL
declare -r JARGROUP_TARGET="target.txt"
# Jar group directory name to download new jars to, is deleted afterwards
declare -r JARGROUP_DOWNLOAD_DIR="downloads"

# The flag which indicates the world should be put in RAM
declare -r WORLD_FLAG_INRAM="inram"
# The flag which indicates the server is active
declare -r SERVER_FLAG_ACTIVE="active"

# The start of a regex to find a log line
declare -r LOG_REGEX="^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} \[.*\]"


### Script State Variables

# "true" whilst the script is counting down a delay to stop the server
declare STOP_COUNTDOWN

# "true" whilst the script is counting down a delay to restart the server
declare RESTART_COUNTDOWN


### Utility Functions

# Executes the command "$2" as user "$1"
# $1: The user to execute the command as
# $2: The command to execute
as_user() {
	local user="$(whoami)"
	if [ "$user" == "$1" ]; then
		bash -c "$2"
	else
		if [ "$user" == "root" ]; then
			su - $1 -s /bin/bash -c "$2"
		else
			echoerr "This command must be executed as the user \"$1\" or \"root\"."
			exit 1
		fi
	fi
}

# Executes the command "$1" as SERVER_USER but returns stderr instead
as_user_stderr() {
	as_user "$@"  > /dev/null 2>&1
}

# Echo to stderr
echoerr() {
	echo "$@" 1>&2
}

# Determines whether "$1" is a valid name for a server or jar group directory
# It must only contain upper or lower case letters, digits, dashes or
# underscores.
# It must also not be one of a list of reserved names.
is_valid_name() {
	local valid="^[a-zA-Z0-9\_\-]+$"
	local invalid="^server|jargroup|start|stop|restart|all$"
	
	if [[ $1 =~ $valid ]]; then
		if [[ $1 =~ $invalid ]]; then
			echoerr "Invalid name \"$1\": A name may not be any of the following reserved worlds \"start\", \"stop\", \"restart\", \"server\", \"jargroup\" or \"all\"."
			return 1
		else
			return 0
		fi
	else
		echoerr "Invalid name \"$1\": A name may only contain letters, numbers, dashes and unscores."
		return 1
	fi
}

# Gets the latest jar from a jar group, based upon the date and time encoded
# in the file name.
# $1: The directory to search
get_latest_file() {
	local best_time=0
	local best_file=""
	
	while IFS= read -r -d $'\0' file; do
		# Remove the path, leaving just the file name
		local date_time=$(basename "$file" | awk -F '-' '{print $1 "-" $2 "-" $3 " " $4 ":" $5 ":" $6}')
		
		# Get the time in seconds since 1970 from file name
		local seconds=$(date -d "$date_time" "+%s" 2> /dev/null)
		
		# If that is newer than the current best, override variables
		if [[ $seconds > $best_time ]]; then
			best_time=$seconds
			best_file=$file
		fi
	done < <(find "$1" -maxdepth 1 -type f -print0)
	
	echo $best_file
}

# Returns the current time as a UNIX timestamp (in seconds since 1970)
now() {
	date +%s
}


### Log Utility Functions

# Gets the UNIX timestamp for a server log line
# $1: A server log line
# returns: Time in seconds since 1970-01-01 00:00:00 UTC
log_line_get_time() {
	time_string=$(echo $1 | awk '{print $1 " " $2}')
	date -d "$time_string" "+%s" 2> /dev/null
}


### World Utility Functions

# Moves a world to RAM
# $1: the ID of the world to move
world_to_ram() {
	if [ ! -z $RAMDISK_STORAGE_PATH ]; then
		as_user ${server_user_name[${world_server_id[$1]}]} "mkdir -p ${world_ramdisk_path[$1]} && rsync -rt --exclude '$WORLD_FLAG_INRAM' \"${world_path[$1]}/\" \"${world_ramdisk_path[$1]}\""
	fi
}

# Moves a world in RAM to disk
# $1: the ID of the world to move
world_to_disk() {
	as_user ${server_user_name[${world_server_id[$1]}]} "rsync -rt --exclude '$WORLD_FLAG_INRAM' \"${world_ramdisk_path[$1]}/\" \"${world_path[$1]}\""
}

# Toggles a worlds ramdisk state
# $1: The ID of the world
world_toggle_ramdisk_state() {
	if [ -e ${world_flag_inram[$1]} ]; then
		echo -n "Removing RAM flag from world \"${world_name[$1]}\"... "
		as_user ${server_user_name[${world_server_id[$1]}]} "rm -f \"${world_flag_inram[$1]}\""
		echo "Done."
		
		echo -n "Removing world \"${world_name[$1]}\" from RAM... "
		as_user ${server_user_name[${world_server_id[$1]}]} "rm -r \"${world_ramdisk_path[$1]}\""
		echo "Done."
	else
		echo -n "Adding RAM flag to world \"${world_name[$1]}\"... "
		as_user ${server_user_name[${world_server_id[$1]}]} "touch \"${world_flag_inram[$1]}\""
		echo "Done."
		
		echo -n "Copying world to RAM... "
		world_to_ram $1
		echo "Done."
	fi
	echo "Changes will only take effect after server is restarted."	
}

# Backs up a world
# $1: The ID of the world
world_backup() {
	echo -n "Backing up world \"${world_name[$1]}\"... "
	
	file_name="$(date "+%F-%H-%M-%S").zip"
	local server_id=${world_server_id[$1]}
	as_user ${server_user_name[$server_id]} "mkdir -p \"${world_backup_path[$1]}\" && cd \"${server_world_storage[$server_id]}\" && zip -rq \"${world_backup_path[$1]}/${file_name}\" \"${world_name[$1]}\""

	echo "Done."
}


### Server Utility Functions

# Returns the ID for a server.
# An ID is given to a server when loaded into memory, and can be used to lookup
# config information for that server
# $1: The name of the server
server_get_id() {
	local i=0
	while [[ $i -lt $num_servers ]]; do
		if [[ "${server_name[$i]}" == "$1" ]]; then
			echo "$i"
			return 0
		fi
		
		i=$(( $i + 1 ))
	done
	
	return 1
}

# Returns the ID of a server's world.
# $1: The ID of the server
# $2: The name of the world
server_world_get_id() {
	local i=${server_world_offset[$1]}
	local max=$(( $i + ${server_num_worlds[$1]} ))
	
	# For each of the servers worlds:
	while [[ $i -lt $max ]]; do
		if [[ "${world_name[$i]}" == "$2" ]]; then
			echo $i
			return 0
		fi
		
		i=$(( $i + 1 ))
	done
	
	return 1
}

# Returns 0 if the server $1 is running and 1 if not
# $1: The ID of the server
server_is_running() {
	if ps ax | grep -v grep | grep "${server_screen_name[$1]} ${server_invocation[$1]}" > /dev/null
	then
		return 0
	else
		return 1
	fi
}

# Creates symbolic links in the server directory (SERVER_STORAGE_PATH) for each
# of the Minecraft worlds located in the world storage directory.
# $1: The id of the server for which links should be ensured
server_ensure_links() {
	echo -n "Maintaining world symbolic links... "
	local i=${server_world_offset[$1]}
	local max=$(( $i + ${server_num_worlds[$1]} ))
	local output="false"
	
	while [[ $i -lt $max ]]; do
		# -L checks for the path being a link rather than a file
		# ! -a, since it is within double square brackets means: the negation of
		# the existence of the file. In other words: true if does not exist
		if [[ -L "${world_link[$i]}" || ! -a "${world_link[$i]}" ]]; then
			# If there is a symbolic link in the server direcotry to this world,
			# or there is not a directory in the server directory containing this world.
			
			# Get the original file path the symbolic link is pointing to
			# If there is no link, link_target will contain nothing
			link_target=$(readlink "${world_link[$i]}")
			
			if ${world_inram[$i]}; then
				# If this world is marked as loaded into RAM

				if [ "${link_target}" != "${world_ramdisk_path[$i]}" ]; then
					# If the symbolic link does not point to the RAM version of the world

					# Remove the symbolic link if it exists
					as_user ${server_user_name[$1]} "rm -f \"${world_link[$i]}\""

					# Create a new symbolic link pointing to the RAM version of the world
					as_user ${server_user_name[$1]} "ln -s \"${world_ramdisk_path[$i]}\" \"${world_link[$i]}\""
				fi
			else
				# Otherwise the world is not loaded into RAM, and is just on disk

				if [ "${link_target}" != "${world_path[$i]}" ]; then
					# If the symbolic link does not point to the disk version of the world

					# Remove the symbolic link if it exists
					as_user ${server_user_name[$1]} "rm -f \"${world_link[$i]}\""

					# Create a new symbolic link pointing to the disk version of the world
					as_user ${server_user_name[$1]} "ln -s \"${world_path[$i]}\" \"${world_link[$i]}\""
				fi
			fi
		else
			echoerr -en "\n    Error: Could not create link for world \"${world_name[$i]}\". The file \"${world_link[$i]}\" already exists, and should not be overwritten automatically. Either remove this file, or rename \"${world_name[$i]}\"."
			output="true"
		fi
		
		i=$(( $i + 1 ))
	done
	
	if [[ $output == "true" ]]; then
		echo -e "\nDone."
	else
		echo "Done."
	fi
}

# Moves a servers worlds into RAM
# $1: The ID of the server
server_worlds_to_ram() {
	# Only proceed if there is a ramdisk path set in config
	if [ ! -z $RAMDISK_STORAGE_PATH ]; then
		echo -n "Synchronising flagged worlds on disk to RAM... "
		local i=${server_world_offset[$1]}
		local max=$(( $i + ${server_num_worlds[$1]} ))
		
		# For each of the servers worlds:
		while [[ $i -lt $max ]]; do
			if ${world_inram[$i]} && [ -L ${world_link[$i]} ]; then
				world_to_ram $i
			fi
			
			i=$(( $i + 1 ))
		done
		echo "Done."
	fi
}

# Moves a servers "in RAM" worlds back to disk
# $1: The ID of the server
server_worlds_to_disk() {
	if [ ! -z $RAMDISK_STORAGE_PATH ]; then
		echo -n "Synchronising worlds in RAM to disk... "
		local i=${server_world_offset[$1]}
		local max=$(( $i + ${server_num_worlds[$1]} ))
		
		# For each of the servers worlds:
		while [[ $i -lt $max ]]; do
			if [ -e ${world_ramdisk_path[$i]} ]; then
				world_to_disk $i		
			fi
			
			i=$(( $i + 1 ))
		done
		echo "Done."
	fi
}

# Watches a server's log for a specific line
# $1: The ID for the server
# $2: A UNIX timestamp (seconds since 1970) which the $3 line must be after
# $3->: The line or lines in the log to wait for
# returns: When the line is found
server_log_get_line() {
    # Make sure there is a server log to check
    as_user ${server_user_name[$1]} "touch ${server_log[$1]}"

	while read line; do
		line_time=$(log_line_get_time "$line")

		# If the entry is old enough
		if [[ $line_time -ge $2 ]]; then
			for search_line in "${@:3}"; do
				local regex="${LOG_REGEX} ${search_line}"
				# and matches the regular expression
				if [[ $line =~ $regex ]]; then
					echo $line
					return 0
				fi
			done
		fi
	done < <(as_user ${server_user_name[$1]} "tail --follow --lines=100 --sleep-interval=0.1 ${server_log[$1]}")
}

# The same as server_log_get_line, but does not print the line to stdout
# when found.
server_log_wait_for_line() {
	server_log_get_line "$@" > /dev/null
}

# Sends as string to a server for execution
# $1: The ID of the server
# $2: The line of text to enter into the server console
server_eval() {
	as_user ${server_user_name[$1]} "screen -p 0 -S ${server_screen_name[$1]} -X eval 'stuff \"$2\"\015'"
}

# The same as server_eval, but also waits for a log entry before returning
# $1: The ID of the server
# $2: A line of text to enter into the server console
# $3->: The line or lines of text in the log to wait for
# stdout: The full entry found in the logs
server_eval_and_get_line() {
	time_now=$(now)
	server_eval $1 "$2"
	server_log_get_line $1 "$time_now" "${@:3}"
}

# The same as server_eval_and_get_line, but does not print anything to stdout
server_eval_and_wait() {
	server_eval_and_get_line "$@" > /dev/null
}

# Gets the process ID for a server if running, otherwise it outputs nothing
# $1: The ID of the server
server_pid() {
	ps ax | grep -v grep | grep "${server_screen_name[$1]} ${server_invocation[$1]}" | awk '{print $1}'
}

# Waits for a server to stop by polling 10 times a second
# This approach is fairyl intensive, so only use when you are expecting the
# server to stop soon
# $1: The ID of the server to wait for
server_wait_for_stop() {
	local pid=$(server_pid $1)
	
	# if the process is still running, wait for it to stop
	if [ ! -z $pid ]; then
		while ps -p $pid > /dev/null; do
			sleep 0.1
		done
	fi
}

# Sets a server's active/inactive state
# $1: The ID of the server
# $2: A string containing "active" or "inactive"
server_set_active() {
	case "$2" in
		active)
			as_user ${server_user_name[$1]} "touch ${server_flag_active[$1]}"
			server_active[$1]="true"
			;;
		inactive)
			as_user ${server_user_name[$1]} "rm -f ${server_flag_active[$1]}"
			server_active[$1]="false"
			;;
		*)
			return 1
			;;
	esac
}


### Jar Group Functions

# Lists the jar files grouped by jar groups.
jargroup_list() {
	for group in $(ls -1 "$JAR_STORAGE_PATH"); do
		echo "${group}:"
		for jar in $(ls -1r $JAR_STORAGE_PATH/$group); do
			if [[ $jar =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}- ]]; then
				echo "    $jar"
			fi
		done
	done
}

# Creates a new jargroup
# $1: The name for the jargroup
jargroup_create() {
	if is_valid_name "$1"; then
		if [[ ! -e "$JAR_STORAGE_PATH/$1" ]]; then
			printf "Creating jar group... "
			
			local error=$(as_user_stderr "$USERNAME" "mkdir -p '$JAR_STORAGE_PATH/$1'")
			if [[ "$error" != "" ]]; then
				echo "Failed."
				echo "Reason: $error"
				return 1
			fi
			
			error=$(as_user "$USERNAME" "echo \"$2\" > '$JAR_STORAGE_PATH/$1/$JARGROUP_TARGET'")
			if [[ "$error" != "" ]]; then
				echo "Failed."
				echo "Reason: $error"
				return 1
			fi
			
			echo "Done."
			
			# Download the latest version now
			jargroup_getlatest "$1"
		else
			echo "A jar group with that name already exists."
			return 1
		fi
	else
		return 1
	fi
}

# Downloads the latest version for a jargroup, using the target URL for that
# group. Saves the download with the date and time encoded in the start of the
# file name, in the jar group directory in question. Removes the file if there
# is no difference between it and the current version.
# $1: The jargroup name to download the latest version for
jargroup_getlatest() {
	if is_valid_name "$1"; then
		if [[ -e "$JAR_STORAGE_PATH/$1" ]]; then
			if [[ -e "$JAR_STORAGE_PATH/$1/$JARGROUP_TARGET" ]]; then
				printf "Downloading latest version... "
			
				# Try and make 
				local error=$(as_user_stderr "$USERNAME" "mkdir -p '$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR'")
				if [[ "$error" != "" ]]; then
					echo "Failed."
					echo "Reason: $error"
					return 1
				fi
			
				as_user "$USERNAME" "wget --quiet --trust-server-names --no-check-certificate --input-file='$JAR_STORAGE_PATH/$1/$JARGROUP_TARGET' --directory-prefix='$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR'"
				echo "Done."
			
				local num_files=$(as_user "$USERNAME" "ls -1 '$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR' | wc -l")
			
				if [[ $num_files == 1 ]]; then
					# There was 1 file downloaded
				
					local file_name=$(ls -1 "$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR")
					local new_name="$(date +%F-%H-%M-%S)-$file_name"
					local most_recent_jar=$(get_latest_file "$JAR_STORAGE_PATH/$1")
					
				
					if [[ ! -e "$most_recent_jar" ]] || ! diff "$most_recent_jar" "$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR/$file_name" > /dev/null; then
						# There is not a previous version to do a comparison against, or
						# The previous version is different:
						# Add it to the group
					
						[[ -e "$most_recent_jar" ]]
						local was_previous=$?
					
						as_user "$USERNAME" "mv '$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR/$file_name' '$JAR_STORAGE_PATH/$1/$new_name'"
					
						if [[ ! -z $most_recent_jar ]]; then
							echo "Downloaded version was different to previous latest. Saved as \"$JAR_STORAGE_PATH/$1/$new_name\"."
						else
							echo "Saved as \"$JAR_STORAGE_PATH/$1/$new_name\"."
						fi
					else
						echo "Existing version \"$JAR_STORAGE_PATH/$1/$new_name\" was already up to date."
					fi
				
				elif [[ $num_files == 0 ]]; then
					# No file was downloaded
					echo "Failed. No files were downloaded."
				else
					# Multiple files were
					echo "Error. URL downloads multiple files."
				fi
			
				# Clean up the temp download folder
				as_user "$USERNAME" "rm -fr '$JAR_STORAGE_PATH/$1/$JARGROUP_DOWNLOAD_DIR'"
			else
				echo "Target URL not found, use $0 jargroup seturl <download-url>"
				return 1
			fi
		else
			echo "There is no jar group with the name \"$1\"."
			return 1
		fi
	else
		return 1
	fi
}

# Deletes an existing jargroup
# $1: The name of the existing jargroup
jargroup_delete() {
	if is_valid_name "$1"; then
		if [[ -e "$JAR_STORAGE_PATH/$1" ]]; then
			printf "Are you sure you want to delete this jar group [y/N]: "
		
			read answer
			if [[ $answer =~ ^y|Y|yes$ ]]; then
				as_user "$USERNAME" "rm -rf $JAR_STORAGE_PATH/$1"
				echo "Jar group deleted."
			else
				echo "Jar group was NOT deleted."
			fi
		else
			echo "There is no jar group with the name \"$1\"."
			return 1
		fi
	else
		return 1
	fi
}

# Renames an existing jargroup
# $1: The name of the existing jargroup
# $2: The new name
jargroup_rename() {
	if is_valid_name "$1"; then
		if [[ -e "$JAR_STORAGE_PATH/$1" ]]; then
			# If the jar group name is valid,
			# and there is no other jar group with the name $1
		
			if is_valid_name "$2"; then
				if [[ -e "$JAR_STORAGE_PATH/$2" ]]; then
					echo "Could not be renamed, there is already a jar group with the name \"$2\"."
					return 1
				else
					# TODO: Update any symbolic links which point to a jar in this directory
					as_user "$USERNAME" "mv '$JAR_STORAGE_PATH/$1' '$JAR_STORAGE_PATH/$2'"
					echo "Renamed jar group \"$1\" to \"$2\"."
				fi
			else
				return 1
			fi
		else
			echo "There is no jar group with the name \"$1\"."
			return 1
		fi
	else
		return 1
	fi
}


### Server Functions

# Echos a list of servers in the SERVER_STORAGE_PATH
server_list() {
	echo "Servers:"
	for server in "$SERVER_STORAGE_PATH/*"; do
		echo "  $(basename $server)"
	done
}

# Creates a new server
# $1: The server name to create
server_create() {
	if is_valid_name "$1"; then
		if [[ -e "$SERVER_STORAGE_PATH/$1" ]]; then
			echo "A server with that name already exists."
			return 1
		else
			printf "Creating server directory... "
			as_user "$USERNAME" "mkdir -p '$SERVER_STORAGE_PATH/$1'"
			as_user "$USERNAME" "touch '$SERVER_STORAGE_PATH/$1/$DEFAULT_WHITELIST'"
			as_user "$USERNAME" "touch '$SERVER_STORAGE_PATH/$1/$DEFAULT_BANNED_IPS'"
			as_user "$USERNAME" "touch '$SERVER_STORAGE_PATH/$1/$DEFAULT_BANNED_PLAYERS'"
			as_user "$USERNAME" "touch '$SERVER_STORAGE_PATH/$1/$DEFAULT_OPS'"
			as_user "$USERNAME" "touch '$SERVER_STORAGE_PATH/$1/$DEFAULT_PROPERTIES'"
			echo "Done."
			
			# Now that the new server has been created, we must call init again
			# to ensure it is recognised.
			init
			
			server_set_jar $(server_get_id "$1") "minecraft"
		fi
	else
		return 1
	fi
}

# Deletes an existing server
# $2: The server name to delete
server_delete() {
	if is_valid_name "$1"; then
		if [[ -e "$SERVER_STORAGE_PATH/$1" ]]; then
			printf "Are you sure you want to delete this server and its worlds (note: backups are preserved) [y/N]: "

			read answer
			if [[ $answer =~ ^y|Y|yes$ ]]; then
				# TODO: stop the server if running first
				as_user "$USERNAME" "rm -rf '$SERVER_STORAGE_PATH/$1'"
				echo "Server deleted."
			else
				echo "Server was NOT deleted."
			fi
		else
			echo "There is no server with the name \"$1\"."
			return 1
		fi
	else
		return 1
	fi
}

# Renames an existing server
# $1: The server name to change
# $2: The new name for the server
server_rename() {
	if is_valid_name "$1"; then
		if [[ -e "$SERVER_STORAGE_PATH/$1" ]]; then
			# If the server name is valid and exists
		
			# TODO: Check that the server is not running first, return if it is
		
			if is_valid_name "$2"; then
				# If the server name is valid
				if [[ -e "$SERVER_STORAGE_PATH/$2" ]]; then
					# and there is not already a server with the name $2
					echo "Could not be renamed, there is already a server with the name \"$2\"."
					return 1
				else
					as_user "$USERNAME" "mv '$SERVER_STORAGE_PATH/$1' '$SERVER_STORAGE_PATH/$2'"
					echo "Renamed server \"$1\" to \"$2\"."
				fi
			else
				return 1
			fi
		else
			echo "There is no server with the name \"$1\"."
			return 1
		fi
	else
		return 1
	fi
}

# Starts a single server
# $1: The ID of the server
server_start() {
	if server_is_running $1; then
		echo "Server \"${server_name[$1]}\" is already running!"
	else
		server_ensure_links $1
		server_worlds_to_ram $1

		local time_now=$(now)
		
		printf "Starting server... "
		
		as_user ${server_user_name[$1]} "cd ${server_path[$1]} && screen -dmS ${server_screen_name[$1]} ${server_invocation[$1]}"
		server_log_wait_for_line $1 "$time_now" "${server_confirm_start[$1]}"
		
		echo "Done."
	fi
}

# Sends the "save-all" command to a server
# $1: The ID of the server
server_save_all() {
	if server_is_running $1; then
		echo -n "Forcing save... "
		
		# Send the "save-all" command and wait for it to finish
		server_eval_and_wait $1 "save-all" "${server_confirm_save_all[$1]}"
		
		echo "Done."
	else
		echo "Server \"${server_name[$1]}\" is not running."
	fi
}

# Sends the "save-off" command to a server
# $1: The ID of the server
server_save_off() {
	if server_is_running $1; then
		echo -n "Disabling level saving... "
		
		# Send the "save-off" command and wait for it to finish
		server_eval_and_wait $1 "save-off" "${server_confirm_save_off[$1]}"
		
		echo "Done."
		
		# Writes any in-memory data manged by the kernel to disk
		sync
	else
		echo "Server \"${server_name[$1]}\" is not running."
	fi
}

# Sends the "save-on" command to a server
# $1: The ID of the server
server_save_on() {
	if server_is_running $1; then
		echo -n "Enabling level saving... "
		
		# Send the "save-on" command and wait for it to finish
		server_eval_and_wait $1 "save-on" "${server_confirm_save_on[$1]}"
		
		echo "Done."
	else
		echo "Server \"${server_name[$1]}\" is not running."
	fi
}

# Stops a single server after a delay
# $1: The ID of the server
server_stop() {
	if server_is_running $1; then
		# Change the state of the script
		STOP_COUNTDOWN[$id]="true"
	
	    server_eval $id "say ${server_stop_message[$id]}"
	    echo "Issued the warning \"${server_stop_message[$id]}\" to players."
	
		echo -n "Shutting down... "
	
		for ((i=${server_stop_delay[$id]}; i>0; i--)); do
			tput sc # Save cursor position
			echo -n "in $i seconds."
			sleep 1
		
			tput rc # Restore cursor to position of last `sc'
			tput el # Clear to end of line
		done
	
		echo -e "Now."
		
		server_stop_now $1
   	else
		echo "Server \"${server_name[$1]}\" is not running."
	fi
}

# Stops a single server right now
# $1: The ID of the server
server_stop_now() {
	if server_is_running $1; then
		server_save_all $1
		
		echo -n "Stopping the server... "
		
		server_eval $1 "stop"
		STOP_COUNTDOWN[$1]="false"
		RESTART_COUNTDOWN[$1]="false"
		server_wait_for_stop $1
		
		echo "Done."
		
		# Synchronise all worlds in RAM to disk
		server_worlds_to_disk $1
	else
		echo "Server \"${server_name[$1]}\" is not running."
	fi
}

# Restarts a single server after a delay
# $1: The ID of the server 
server_restart() {
	# Restarts the server if it is already running
	if server_is_running $1; then
		# Change the state of the script
		RESTART_COUNTDOWN[$id]="true"
	
	    server_eval $id "say ${server_restart_message[$id]}"
	    echo "Issued the warning \"${server_restart_message[$id]}\" to players."
	
		echo -n "Restarting... "
	
		for ((i=${server_stop_delay[$id]}; i>0; i--)); do
			tput sc # Save cursor position
			echo -n "in $i seconds."
			sleep 1
		
			tput rc # Restore cursor to position of last `sc'
			tput el # Clear to end of line
		done
	
		echo -e "Now."
		
		server_stop_now $1
	fi
	
	server_start $1
}

# Restarts a single server right away
# $1: The ID of the server
server_restart_now() {
	# Restarts the server if it is already running
	if server_is_running $1; then
		server_stop_now $1
	fi
	
	server_start $1
}

# List the worlds available for a server
# $1: The ID of the server
server_worlds_list() {
	local i=${server_world_offset[$1]}
	local max=$(( $i + ${server_num_worlds[$1]} ))
	
	# For each of the servers worlds:
	while [[ $i -lt $max ]]; do
		if ${world_inram[$i]}; then
			echo "[RAM] ${world_name[$i]}"
		else
			echo "[DSK] ${world_name[$i]}"
		fi
		
		i=$(( $i + 1 ))
	done
}

# Backs up the worlds for a server
# $1: The ID of the server
server_worlds_backup() {
	local i=${server_world_offset[$1]}
	local max=$(( $i + ${server_num_worlds[$1]} ))

	# For each of the servers worlds:
	while [[ $i -lt $max ]]; do
		world_backup $i
		i=$(( $i + 1 ))
	done
}

# Moves a servers log into another file, leaving the original log file empty
# $1: The ID of the server
server_log_roll() {
	# Moves and Gzips the logfile, a big log file slows down the
	# server A LOT (what was notch thinking?)

	printf "Rolling server logs... "
	
	if [ -e "${server_log[$1]}" ]; then
		file_name="${server_name[$1]}-$(date +%F-%H-%M-%S).log"
		as_user ${server_user_name[$1]} "mkdir -p \"${server_log_archive_path[$1]}\" && cp \"${server_log[$1]}\" \"${server_log_archive_path[$1]}/${file_name}\" && gzip \"${server_log_archive_path[$1]}/${file_name}\""
		
		if [ -e "${server_log_archive_path[$1]}/${file_name}.gz" ]; then
			as_user ${server_user_name[$1]} "cp \"/dev/null\" ${server_log[$1]}"
			as_user ${server_user_name[$1]} "echo \"Previous logs can be found at \\\"${server_log_archive_path[$1]}\\\"\" > ${server_log[$1]}"
		else
			echoerr "Failed."
			return 1
		fi
	fi
	
	echo "Done."
}

# Backups a server's directory
# $1: The ID of the server
server_backup() {
	echo -n "Backing up the entire server directory... "
	
	zip_flags="-rq"
	# Add the "y" flag if symbolic links should not be followed
	if [ "${server_complete_backup_follow_symlinks[$1]}" != "true" ]; then
		zip_flags="${zip_flags}y"
	fi
	
	# Zip up the server directory
	file_name="${server_backup_path[$1]}/$(date "+%F-%H-%M-%S").zip"
	as_user ${server_user_name[$1]} "mkdir -p \"${server_backup_path[$1]}\" && cd \"$SERVER_STORAGE_PATH\" && zip ${zip_flags} \"${file_name}\" \"${server_name[$1]}\""
	
	echo "Done."
}

# Sets a server's jar file
# $1: The ID of the server
# $2: The name of the jar group
# $3: Optionally, a specific jar to use.
server_set_jar() {
	if [ -e "$JAR_STORAGE_PATH/$3" ]; then
		
		if [ -z "$3" ]; then
			# If a specific jar file is not mentioned
			
			# Download the latest version
			jargroup_getlatest "$2"
			local jar=$(get_latest_file "$JAR_STORAGE_PATH/$2")
		else
			# If a specific jar IS mentioned use that
			local jar="$JAR_STORAGE_PATH/$2/$3"
			
			if [[ ! -e "$jar" ]]; then
				echo "There is no jar named \"$3\" in jargroup \"$2\"."
				return 1
			fi
		fi
		
		if [[ ! -z "$jar" ]]; then
			as_user "${server_user[$1]}" "ln -sf $jar ${server_jar[$1]}"
			echo "Server \"${server_name[$1]}\" is now using \"$jar\"."
		fi
	else
		echo "There is no jargorup named \"$2\"."
	fi
}

# Lists the players currently connected to a server
# $1: The ID of the server
server_connected() {
	if server_is_running $1; then
		local line=$(server_eval_and_get_line $1 "list" "Connected players:")
		
		# Cuts the start off the line, and the last three (invisible)
		# characters from the end.
		local players=${line:46:(-3)}
		
		if [ -z "$players" ]; then
			echo "No players are connected."
		else
			echo "$players"
		fi
	else
		echo "Server \"${server_name[$id]}\" is not running. No users are connected."
	fi
}


### Manager Functions

# Stops all running servers after a servers specified delay
# $1: String containing "stop" or "restart". Represents whether the stop is 
#     with a mind to stop the server, or just to restart it. And effects
#     the message issued to players on a server.
manager_stop_all_servers() {
	# An array of true/false for each server
	local was_running
	# False if no servers were running at all
	local any_running="false"
	
	# For all running servers issue the stop warning
	local max_countdown=0
	
	for ((server=0; server<${num_servers}; server++)); do
		if server_is_running $server; then
			any_running="true"
			was_running[$server]="true"
			STOP_COUNTDOWN[$server]="true"
			if [[ ${server_stop_delay[$i]} > $max_countdown ]]; then
				max_countdown=${server_stop_delay[$server]}
			fi
			
			# Send a warning message to the server
			case "$1" in
				stop) server_eval $server "say ${server_stop_message[$server]}";;
				restart) server_eval $server "say ${server_restart_message[$server]}";;
			esac
			
			# Send message to stdout
			echo "Server \"${server_name[$server]}\" was running, now stopping:"
			
			case "$1" in
				stop) echo "    Issued the warning \"${server_stop_message[$server]}\" to players.";;
				restart) echo "    Issued the warning \"${server_restart_message[$server]}\" to players.";;
			esac
			
			case ${server_stop_delay[$server]} in
				0) echo "    Stopping without delay.";;
				1) echo "    Stopping after 1 second.";;
				*) echo "    Stopping after ${server_stop_delay[$server]} seconds.";;
			esac
		else
			echo "Server \"${server_name[$server]}\" was NOT running."
			was_running[$server]="false"
		fi
	done
	
	if "$any_running"; then
		# Wait for the maximum possible delay, stopping servers
		# at the correct times
		echo -n "All servers will have been issued the stop command... "
		for ((tick=${max_countdown}; tick>=0; tick--)); do
			tput sc # Save cursor position
		
			if [[ $tick -le 1 ]]; then
				echo -n "in $tick second."
			else
				echo -n "in $tick seconds."
			fi
		
			# Each second check all server, to see if its their time to
			# stop. If so issue the stop command, and don't hang.
			for ((server=0; server<${num_servers}; server++)); do
				if server_is_running $server; then
					stop_tick=$(( ${max_countdown} - ${server_stop_delay[$server]} ))
					if [[ $stop_tick == $tick ]]; then
						server_eval $server "stop"
						STOP_COUNTDOWN[$server]="false"
					fi
				fi
			done
		
			if [[ $tick > 0 ]]; then
				sleep 1
			fi

			tput rc # Restore cursor to position of last `sc'
			tput el # Clear to end of line
		done
	
		# Start a new line
		echo "Now."
	
		# Finally check all servers have stopped
		for ((server=0; server<${num_servers}; server++)); do
			if "${was_running[$server]}"; then
				echo -n "Ensuring server \"${server_name[$server]}\" has stopped... "
				server_wait_for_stop $server
				echo "Done."
			fi
		done
	else
		echo "No servers were running."
	fi
}

# Stops all running servers without delay
manager_stop_all_servers_now() {
	# An array of true/false for each server
	local was_running
	# False if no servers were running at all
	local any_running="false"
	
	# Stop all servers at the same time
	for ((server=0; server<${num_servers}; server++)); do
		if server_is_running $server; then
			was_running[$server]="true"
			any_running="true"
			echo "Server \"${server_name[$server]}\" was running, now stopping."
			server_eval $server "stop"
		else
			echo "Server \"${server_name[$server]}\" was NOT running."
			was_running[$server]="false"
		fi
	done
	
	if $any_running; then
		# Ensure all the servers have stopped
		for ((server=0; server<${num_servers}; server++)); do
			if ${was_running[$server]}; then
				echo -n "Ensuring server \"${server_name[$server]}\" has stopped... "
				server_wait_for_stop $server
				echo "Done."
			fi
		done
	else
		echo "No servers were running."
	fi
}


### Main Functions

init() {

	# These defaults can be overriden in the file specified by $CONFIG
	
	USERNAME="minecraft"
	SERVER_STORAGE_PATH="/opt/msm/servers"
	JAR_STORAGE_PATH="/opt/msm/jars"
	RAMDISK_STORAGE_PATH="/dev/shm/msm"
	WORLD_ARCHIVE_PATH="/opt/msm/archives/worlds"
	LOG_ARCHIVE_PATH="/opt/msm/archives/logs"
	BACKUP_ARCHIVE_PATH="/opt/msm/archives/backups"
	DEFAULT_SERVER_CONF="server.conf"
	DEFAULT_SERVER_USER="minecraft"
	DEFAULT_SCREEN_NAME="msm-{SERVER_NAME}"
	DEFAULT_WORLD_STORAGE_PATH="worldstorage"
	DEFAULT_COMPLETE_BACKUP_FOLLOW_SYMLINKS="false"
	DEFAULT_LOG="server.log"
	DEFAULT_PROPERTIES="server.properties"
	DEFAULT_WHITELIST="white-list.txt"
	DEFAULT_BANNED_PLAYERS="banned-players.txt"
	DEFAULT_BANNED_IPS="banned-ips.txt"
	DEFAULT_OPS="ops.txt"
	DEFAULT_JAR="server.jar"
	DEFAULT_RAM="1024"
	DEFAULT_INVOCATION="java -Xms{RAM}M -Xmx{RAM}M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:+AggressiveOpts -jar {JAR} nogui"
	DEFAULT_STOP_DELAY=10
	DEFAULT_RESTART_DELAY=10
	DEFAULT_STOP_MESSAGE="SERVER SHUTTING DOWN IN {DELAY} SECONDS!"
	DEFAULT_STOP_ABORT="Server shut down aborted."
	DEFAULT_RESTART_MESSAGE="SERVER REBOOT IN {DELAY} SECONDS!"
	DEFAULT_RESTART_ABORT="Server reboot aborted."
	DEFAULT_WORLD_BACKUP_STARTED="Backing up world."
	DEFAULT_WORLD_BACKUP_FINISHED="Backup complete."
	DEFAULT_COMPLETE_BACKUP_STARTED="Backing up entire server."
	DEFAULT_COMPLETE_BACKUP_FINISHED="Backup complete."
	DEFAULT_CONFIRM_SAVE_ON="CONSOLE: Enabling level saving.."
	DEFAULT_CONFIRM_SAVE_OFF="CONSOLE: Disabling level saving.."
	DEFAULT_CONFIRM_SAVE_ALL="CONSOLE: Save complete."
	DEFAULT_CONFIRM_START="Done"
	DEFAULT_CONFIRM_KICK="CONSOLE: Kicking "
	DEFAULT_CONFIRM_KICK_FAIL="Can't find user "
	DEFAULT_CONFIRM_TIME_SET="CONSOLE: Set time to"
	DEFAULT_CONFIRM_TIME_SET_FAIL="Unable to convert time value"
	DEFAULT_CONFIRM_TIME_ADD="CONSOLE: Added .+ to time"
	DEFAULT_CONFIRM_TIME_ADD_FAIL="Unable to convert time value"
	DEFAULT_CONFIRM_TOGGLEDOWNFALL="CONSOLE: Toggling downfall on|off for world"
	DEFAULT_CONFIRM_TOGGLEDOWNFALL_FAIL=".\[31m;1mNo world exists with the name"
	DEFAULT_CONFIRM_GAMEMODE="CONSOLE: Setting .+ to game mode (1|0)"
	DEFAULT_CONFIRM_GAMEMODE_FAIL_NO_USER="Can't find user .+"
	DEFAULT_CONFIRM_GAMEMODE_FAIL_NO_CHANGE=".+ already has game mode (1|0)"
	
	# Sourcing $CONFIG will override the previous defaults, with new values
	source $CONFIG

	local i=0
	local j=0
	
	for server in $(ls -1 "$SERVER_STORAGE_PATH"); do
		server_name[$i]="$server"
		server_path[$i]="$SERVER_STORAGE_PATH/$server"
		server_conf[$i]="${server_path[$i]}/$DEFAULT_SERVER_CONF"
		server_flag_active[$i]="${server_path[$i]}/$SERVER_FLAG_ACTIVE"
		server_backup_path[$i]="$BACKUP_ARCHIVE_PATH/${server_name[$i]}"
		server_log_archive_path[$i]="$LOG_ARCHIVE_PATH/${server_name[$i]}"
		
		if [[ -e "${server_flag_active[$i]}" ]]; then
			server_active[$i]="true"
		else
			server_active[$i]="false"
		fi
		
		# Setup defaults
		# Note: screen_name will at this stage have the {SERVER_NAME} tag in it
		# which needs to be replaced.
		# Invocation may also the {RAM} and {JAR} tags.
		
		server_user_name[$i]="$DEFAULT_SERVER_USER"
		server_screen_name[$i]="${DEFAULT_SCREEN_NAME//\{SERVER_NAME\}/${server_name[$i]}}" # Replace tags now, they cannot change
		server_world_storage[$i]="${server_path[$i]}/$DEFAULT_WORLD_STORAGE_PATH"
		server_log[$i]="${server_path[$i]}/$DEFAULT_LOG"
		server_properties[$i]="${server_path[$i]}/$DEFAULT_PROPERTIES"
		server_whitelist[$i]="${server_path[$i]}/$DEFAULT_WHITELIST"
		server_banned_players[$i]="${server_path[$i]}/$DEFAULT_BANNED_PLAYERS"
		server_banned_ips[$i]="${server_path[$i]}/$DEFAULT_BANNED_IPS"
		server_ops[$i]="${server_path[$i]}/$DEFAULT_OPS"
		server_jar[$i]="${server_path[$i]}/$DEFAULT_JAR"
		server_ram[$i]="$DEFAULT_RAM"
		server_invocation[$i]="$DEFAULT_INVOCATION" # Don't replace tags yet, they may change
		server_stop_delay[$i]="$DEFAULT_STOP_DELAY"
		server_restart_delay[$i]="$DEFAULT_RESTART_DELAY"
		server_stop_message[$i]="$DEFAULT_STOP_MESSAGE"
		server_stop_abort[$i]="$DEFAULT_STOP_ABORT"
		server_restart_message[$i]="$DEFAULT_RESTART_MESSAGE"
		server_restart_abort[$i]="$DEFAULT_RESTART_ABORT"
		server_world_backup_started[$i]="$DEFAULT_WORLD_BACKUP_STARTED"
		server_world_backup_finished[$i]="$DEFAULT_WORLD_BACKUP_FINISHED"
		server_complete_backup_started[$i]="$DEFAULT_COMPLETE_BACKUP_STARTED"
		server_complete_backup_finished[$i]="$DEFAULT_COMPLETE_BACKUP_FINISHED"
		server_confirm_save_on[$i]="$DEFAULT_CONFIRM_SAVE_ON"
		server_confirm_save_off[$i]="$DEFAULT_CONFIRM_SAVE_OFF"
		server_confirm_save_all[$i]="$DEFAULT_CONFIRM_SAVE_ALL"
		server_confirm_start[$i]="$DEFAULT_CONFIRM_START"
		server_confirm_kick[$i]="$DEFAULT_CONFIRM_KICK"
		server_confirm_kick_fail[$i]="$DEFAULT_CONFIRM_KICK_FAIL"
		server_confirm_time_set[$i]="$DEFAULT_CONFIRM_TIME_SET"
		server_confirm_time_set_fail[$i]="$DEFAULT_CONFIRM_TIME_SET_FAIL"
		server_confirm_time_add[$i]="$DEFAULT_CONFIRM_TIME_ADD"
		server_confirm_time_add_fail[$i]="$DEFAULT_CONFIRM_TIME_ADD_FAIL"
		server_confirm_toggledownfall[$i]="$DEFAULT_CONFIRM_TOGGLEDOWNFALL"
		server_confirm_toggledownfall_fail[$i]="$DEFAULT_CONFIRM_TOGGLEDOWNFALL_FAIL"
		server_confirm_gamemode[$i]="$DEFAULT_CONFIRM_GAMEMODE"
		server_confirm_gamemode_fail_no_user[$i]="$DEFAULT_CONFIRM_GAMEMODE_FAIL_NO_USER"
		server_confirm_gamemode_fail_no_change[$i]="$DEFAULT_CONFIRM_GAMEMODE_FAIL_NO_CHANGE"
		server_complete_backup_follow_symlinks[$i]="$DEFAULT_COMPLETE_BACKUP_FOLLOW_SYMLINKS"
		
		
		# Load config overrides from server config file if present
		
		if [[ -e "${server_conf[$i]}" ]]; then
			local name
			local value
			
			while read line; do 
			 	# ignore comment lines
				echo "$line" | grep "^#" >/dev/null 2>&1 && continue
			
			   	# if not empty, set the property using declare
			   	if [ ! -z "$line" ]; then
				 	name="$(echo $line | awk -F '=' '{print $1}')"
					value="$(echo $line | awk -F '\"' '{print $2}')"
				fi
				
				case "$name" in
					SERVER_USER) server_user_name[$i]="$value";;
					SCREEN_NAME) server_screen_name[$i]="$value";;
					WORLD_STORAGE_DIR) server_world_storage[$i]="${server_path[$i]}/$value";;
					
					LOG) server_log[$i]="${server_path[$i]}/$value";;
					PROPERTIES) server_properties[$i]="$value";;
					WHITELIST) server_whitelist[$i]="$value";;
					BANNED_PLAYERS) server_banned_players[$i]="$value";;
					BANNED_IPS) server_banned_ips[$i]="$value";;
					
					OPS) server_ops[$i]="$value";;
					JAR) server_jar[$i]="${server_path[$i]}/$value";;
					RAM) server_ram[$i]="$value";;
					INVOCATION) server_invocation[$i]="$value";;
					
					STOP_DELAY) server_stop_delay[$i]="$value";;
					RESTART_DELAY) server_restart_delay[$i]="$value";;
					STOP_MESSAGE) server_stop_message[$i]="$value";;
					STOP_ABORT) server_stop_abort[$i]="$value";;
					RESTART_MESSAGE) server_restart_message[$i]="$value";;
					RESTART_ABORT) server_restart_abort[$i]="$value";;
					WORLD_BACKUP_STARTED) server_world_backup_started[$i]="$value";;
					WORLD_BACKUP_FINISHED) server_world_backup_finished[$i]="$value";;
					
					COMPLETE_BACKUP_STARTED) server_complete_backup_started[$i]="$value";;
					COMPLETE_BACKUP_FINISHED) server_complete_backup_finished[$i]="$value";;
					CONFIRM_SAVE_ON) server_confirm_save_on[$i]="$value";;
					CONFIRM_SAVE_OFF) server_confirm_save_off[$i]="$value";;
					CONFIRM_SAVE_ALL) server_confrim_save_all[$i]="$value";;
					CONFIRM_START) server_confrim_start[$i]="$value";;
					CONFIRM_WHITELIST_LIST) server_confirm_whitelist_list[$i]="$value";;
					CONFIRM_KICK) server_confirm_kick[$i]="$value";;
					CONFIRM_KICK_FAIL) server_confirm_kick_fail[$i]="$value";;
					CONFIRM_TIME_SET) server_confirm_time_set[$i]="$value";;
					CONFIRM_TIME_SET_FAIL) server_confirm_time_set_fail[$i]="$value";;
					CONFIRM_TIME_ADD) server_confirm_time_add[$i]="$value";;
					CONFIRM_TIME_ADD_FAIL) server_confirm_time_add_fail[$i]="$value";;
					CONFIRM_TOGGLEDOWNFALL) server_confirm_toggledownfall[$i]="$value";;
					CONFIRM_TOGGLEDOWNFALL_FAIL) server_confirm_toggledownfall_fail[$i]="$value";;
					CONFIRM_GAMEMODE) server_confirm_gamemode[$i]="$value";;
					CONFIRM_GAMEMODE_FAIL_NO_USER) server_confirm_gamemode_fail_no_user[$i]="$value";;
					CONFIRM_GAMEMODE_FAIL_NO_CHANGE) server_confirm_gamemode_fail_no_change[$i]="$value";;
					COMPLETE_BACKUP_FOLLOW_SYMLINKS) server_complete_backup_follow_symlinks[$i]="$value";;
				esac
			done < "${server_conf[$i]}"
		fi
		
		# Replace tags in delay messages
		server_stop_message[$i]="${server_stop_message[$i]//\{DELAY\}/${server_stop_delay[$i]}}"
		server_restart_message[$i]="${server_restart_message[$i]//\{DELAY\}/${server_restart_delay[$i]}}"
		
		# Replace tags in server invocation
		server_invocation[$i]="${server_invocation[$i]//\{RAM\}/${server_ram[$i]}}"
		server_invocation[$i]="${server_invocation[$i]//\{JAR\}/${server_jar[$i]}}"
		
		
		# Load worlds if there is a world storage directory present
		server_world_offset[$i]=0
		server_num_worlds[$i]=0
		
		if [[ -e "${server_world_storage[$i]}" ]]; then
			server_worlds[$i]=$(ls -1 "${server_world_storage[$i]}")
			
			# Record the index at which worlds for this server start
			server_world_offset[$i]=$j
		
			for world in ${server_worlds[$i]}; do
				world_server_id[$j]="$i"
				world_name[$j]="$world"
				world_path[$j]="${server_world_storage[$i]}/${world_name[$j]}"
				world_link[$j]="${server_path[$i]}/${world_name[$j]}"
				world_flag_inram[$j]="${world_path[$j]}/$WORLD_FLAG_INRAM"
				world_backup_path[$j]="$WORLD_ARCHIVE_PATH/${server_name[$i]}/${world_name[$j]}"
				
				if [ ! -z $RAMDISK_STORAGE_PATH ]; then
					world_ramdisk_path[$j]="${RAMDISK_STORAGE_PATH}/${server_name[$i]}/${world_name[$j]}"
				fi
			
				if [[ -e "${world_path[$j]}/$WORLD_FLAG_INRAM" ]]; then
					world_inram[$j]="true"
				else
					world_inram[$j]="false"
				fi
			
				j=$(($j+1))
			done
			
			# Record the number of worlds this server has
			server_num_worlds[$i]=$(( $j - ${server_world_offset[$i]} ))
		fi
		
		i=$(($i+1))
	done
	
	num_servers=$i
	num_worlds=$j
}

# Called if the script is interrupted before exiting naturally
interrupt() {
	local exit_message="false"
	for ((i=0; $i<$num_servers; i++)); do
		if [[ "${STOP_COUNTDOWN[$i]}" == "true" ]] && server_is_running $i; then
			if [[ "$exit_message" == "false" ]]; then
				echo -e "\nInterrupted..."
				exit_message="true"
			fi
			server_eval $i "say ${server_stop_abort[$i]}"
			echo "Server \"${server_name[$i]}\" shutdown was aborted."
		fi
		
		if [[ "${RESTART_COUNTDOWN[$i]}" == "true" ]] && server_is_running $i; then
			if [[ "$exit_message" == "false" ]]; then
				echo -e "\nInterrupted..."
				exit_message="true"
			fi
			server_eval $i "say ${server_restart_abort[$i]}"
			echo "Server \"${server_name[$i]}\" restart was aborted."
		fi
	done
	exit
}

# The main function which starts the script
main() {
	# Initialise variables that represent system state
	init
	
	# Trap interrupts to the script by calling the interrupt function
	trap interrupt EXIT
	
	case "$1" in
		start)
			# Required start option, for debian init.d scripts
			for ((server=0; server<${num_servers}; server++)); do
				# Only starts active servers
				if ${server_active[$server]}; then
					if server_is_running $server; then
						echo "[ACTIVE] Server \"${server_name[$server]}\" already started."
					else
						echo "[ACTIVE] Server \"${server_name[$server]}\" starting:"
						server_start $server
					fi
				else
					if server_is_running $server; then
						echo "[INACTIVE] Server \"${server_name[$server]}\" already started. It should not be running! Use \"$0 ${server_name[$server]} stop\" to stop this server."
					else
						echo "[INACTIVE] Server \"${server_name[$server]}\" leaving stopped, as this server is inactive."
					fi
				fi
			done
			;;
		stop)
			if [ "$2" != "now" ]; then
				# If the the now flag is not specified
				manager_stop_all_servers "stop"
			else
				# If the now flag is specified
				manager_stop_all_servers_now
			fi
			;;
		restart)
			# Required restart option, for debian init.d scripts
			
			# Stop any running servers, now if specified
			echo "Stopping servers:"
			main "stop" "$2"
			
			echo "Starting servers:"
			main "start"
			;;
		server)
			case "$2" in
				list)
					# Lists the existing servers
					server_list
					;;
				create)
					if [ -z "$3" ]; then
						# If a server name is not provided
						echo "Invalid command."
					else
						# Create a new server
						server_create "$3"
					fi
					;;
				delete)
					if [ -z "$3" ]; then
						# If a server name is not provided
						echo "Invalid command."
					else
						# Delete an existing server, with confirmation
						server_delete "$3"
					fi
					;;
				rename)
					if [ -z "$3" ] || [ -z "$4" ]; then
						# If a server name is not provided
						echo "Invalid command."
					else
						# Rename an existing server
						server_rename "$3" "$4"
					fi
					;;
				*)
					# "server" is not a valid command
					echo "Invalid command."
					;;
			esac
			;;
		jargroup)
			case "$2" in
				list)
					# Lists the jars grouped by jargroup
					jargroup_list
					;;
				create)
					if [ -z "$3" ] || [ -z "$4" ]; then
						echo "Invlaid command."
					else
						jargroup_create "$3" "$4"
					fi
					;;
				delete)
					if [ -z "$3" ]; then
						echo "Invalid command."
					else
						jargroup_delete "$3"
					fi

					;;
				rename)
					if [ -z "$3" ] || [ -z "$4" ]; then
						echo "Invalid command."
					else
						jargroup_rename $3 $4
					fi
					;;
				changetarget)
					if [ -z "$3" ] || [ -z "$4" ]; then
						echo "Invalid command."
					else
						jargroup_settarget "$3" "$4"
					fi
					;;
				getlatest)
					if [ -z "$3" ]; then
						echo "Invalid command."
					else
						jargroup_getlatest "$3"
					fi
					;;
				*)
					# "jargroup" is not a valid command
					echo "Invalid command."
					;;
			esac
			;;
		help)
			# Outputs a list of all commands
			echo -e "Usage: $0 command:"
			echo -e
			echo -e "--Setup Commands------------------------------------------------"
			echo -e "  server list \t\t\t\t\tList servers"
			echo -e "  server create <name> \t\t\t\tCreates a new Minecraft server"
			echo -e "  server delete <name> \t\t\t\tDeletes an existing Minecraft server"
			echo -e "  server rename <name> <new-name> \t\tRenames an existing Minecraft server"
			echo -e
			echo -e "--Server Mangement Commands-------------------------------------"
			echo -e "  <server> start \t\t\t\tStarts a server"
			echo -e "  <server> stop [now] \t\t\t\tStops a server after warning players, or right now"
			echo -e "  <server> restart [now] \t\t\tRestarts a server after warning players, or right now"
			echo -e "  <server> status \t\t\t\tShow the running/stopped status of a server"
			echo -e "  <server> connected \t\t\t\tList a servers connected players"
			echo -e "  <server> worlds list \t\t\t\tLists the worlds a server has"
			echo -e "  <server> worlds load \t\t\t\tCreates links to worlds in storage for a server"
			echo -e "  <server> worlds ram <world> \t\t\tToggles a world's \"in RAM\" status"
			echo -e "  <server> worlds toram \t\t\tSynchronises any RAM enabled worlds to RAM a server has"
			echo -e "  <server> worlds todisk \t\t\tSynchronises any \"in RAM\" worlds to disk a server has"
			echo -e "  <server> worlds backup \t\t\tMakes a backup of all worlds a server has"
			echo -e "  <server> logroll \t\t\t\tMove a server log to a gziped archive, to reduce lag"
			echo -e "  <server> backup \t\t\t\tMakes a backup of an entire server directory"
			echo -e
			echo -e "--Server Pass Through Commands----------------------------------"
			echo -e "  <server> wl on|off <player> \t\t\tEnabled/disable server whitelist check"
			echo -e "  <server> wl add|remove <player> \t\tAdd/remove a player to/from a server's whitelist"
			echo -e "  <server> wl list \t\t\t\tList the players whitelisted for a server"
			echo -e "  <server> bl player add|remove <player> \tBan/pardon a player from/for a server"
			echo -e "  <server> bl ip add|remove <ip address> \tBan/pardon an IP address from/for a server"
			echo -e "  <server> bl list \t\t\t\tLists the banned players and IP address for a server"
			echo -e "  <server> op add|remove <player> \t\tAdd/remove operator status for a player on a server"
			echo -e "  <server> gm survival|creative <player> \tChange the game mode for a player on a server"
			echo -e "  <server> kick <player> \t\t\tForcibly disconnect a player from a server"
			echo -e "  <server> say <message> \t\t\tBroadcast a (pink) message to all players on a server"
			echo -e "  <server> time set|add <number> \t\tSet/increment time on a server (0-24000)"
			echo -e "  <server> toggledownfall \t\t\tToggles rain and snow on a server"
			echo -e "  <server> save on|off \t\t\t\tEnable/disable writing world changes to file"
			echo -e "  <server> save all \t\t\t\tForce the writing of all non-saved world changes to file"
			echo -e "  <server> cmd <command> \t\t\tSend a command string to the server and return"
			echo -e "  <server> cmdlog <command> \t\t\tSame as 'cmd' but shows log output afterwards (Ctrl+C to exit)"
			echo -e
			echo -e "--Jar Commands--------------------------------------------------"
			echo -e "  jargroup list \t\t\t\tList the stored jar files."
			echo -e "  jargroup create <name> <download-url> \tCreate a new jar group, with a URL for new downloads"
			echo -e "  jargroup delete <name> \t\t\tDelete a jar group"
			echo -e "  jargroup rename <name> <new-name> \t\tRename a jar group"
			echo -e "  jargroup changeurl <name> <download-url> \tChange the download URL for a jar group"
			echo -e "  jargroup getlatest <name> \t\t\tDownload the latest jar file for a jar group"
			echo -e
			echo -e "--Global Commands-----------------------------------------------"
			echo -e "  start \t\t\t\t\tStarts all active servers"
			echo -e "  stop [now]\t\t\t\t\tStops all running servers"
			echo -e "  restart [now]\t\t\t\t\tRestarts all active servers"
			;;
		"")
			echo "No such command see: $0 help"
			;;
		*)	
			if [[ "$1" == "all" ]] || [[ -e "$SERVER_STORAGE_PATH/$1" ]]; then
				
				local id=$(server_get_id "$1")
				
				case "$2" in
					start)
						server_set_active $id "active"
						server_start $id
						;;
					stop)
						server_set_active $id "inactive"
						if [[ $3 != "now" ]]; then
							server_stop $id
						else
							server_stop_now $id
						fi
						;;
					restart)
						server_set_active $1 "active"
						if [[ $3 != "now" ]]; then
							server_restart $id
						else
							server_restart_now $id
						fi
						;;
					status)
						if server_is_running $id; then
							echo "Server \"${server_name[$id]}\" is running."
						else
							echo "Server \"${server_name[$id]}\" is stopped."
						fi
						;;
					connected)
						server_connected $id
						;;
					worlds)
						case "$3" in
							list)
								server_worlds_list $id
								;;
							load)
								server_ensure_links $id
								;;
							ram)
								if [ -z "$4" ]; then
									echo "Invalid command."
								else
									world_id=$(server_world_get_id $id "$4")
									
									if [ ! -z $world_id ]; then
										world_toggle_ramdisk_state $world_id
									else
										echo "Server \"${server_name[$id]}\" has no world with that name."
									fi
								fi
								;;
							todisk)
								server_save_off $id
								server_save_all $id
								server_worlds_to_disk $id
								server_save_on $id
								;;
							backup)
								if server_is_running $id; then
									server_eval $id "say ${server_world_backup_started[$id]}"
									server_save_off $id
									server_save_all $id
								fi
								
								server_worlds_to_disk $id
								server_worlds_backup $id
								
								if server_is_running $id; then
									server_save_on $id
									server_eval $id "say ${server_world_backup_finished[$id]}"
								fi
								
								echo "Backup took $SECONDS seconds".
								;;
							*)
								echo "Invalid command."
								;;
						esac
						;;
					logroll)
						server_log_roll $id
						;;
					backup)
						if server_is_running $id; then
							server_eval $id "say ${server_complete_backup_started[$id]}"
							server_save_off $id
							server_save_all $id
						fi
						
						server_worlds_to_disk $id
						server_backup $id
						
						if server_is_running $id; then
							server_save_on $id
							server_eval $id "say ${server_complete_backup_finished[$id]}"
						fi
						
						echo "Backup took $SECONDS seconds".
						;;
					jar)
						if [ -z "$3" ]; then
							echo "Invalid command."
						else
							server_set_jar $id "$3"
						fi
						;;
					whitelist|wl)
						case "$3" in
							on)
								if server_is_running $id; then
									server_eval $id "whitelist on"
									echo "Whitelist enabled"
								else
									echo "Server \"${server_name[$id]}\" is not running."
								fi
								;;
							off)
								if server_is_running $id; then
									server_eval $id "whitelist off"
									echo "Whitelist disabled"
								else
									echo "Server \"${server_name[$id]}\" is not running."
								fi
								;;
							add)
								if [ -z "$4" ]; then
									echo "Invalid command."
								else
									if server_is_running $id; then
										server_eval $id "whitelist add $4"
										echo "Added \"$4\" to the whitelist."
									else
										echo "Server \"${server_name[$id]}\" is not running."
									fi
								fi
								;;
							remove)
								if [ -z "$4" ]; then
									echo "Invalid command."
								else
									if server_is_running $id; then
										server_eval $id "whitelist remove $4"
										echo "Removed \"$4\" from the whitelist."
									else
										echo "Server \"${server_name[$id]}\" is not running."
									fi
								fi
								;;
							list)
								local players=$(cat ${server_whitelist[$id]})

								if [ -z "$players" ]; then
									echo "No players are whitelisted."
								else
									echo "$players"
								fi
								;;
							*)
								echo "Invalid command."
								;;
						esac
						;;
					blacklist|bl)
						case "$3" in
							player)
								if [ -z "$5" ]; then
									echo "Invalid command."
								else
									case "$4" in
										add)
											for player in ${*:5}; do
											 	server_eval $id "ban $player"
											done
											if [[ $# > 5 ]]; then
												echo -n "Blacklisted the following players: "
												echo -n "$5"
												for player in ${*:6}; do
												 	echo -n ", $player"
												done
												echo "."
											else
												echo "Blacklisted \"$5\"."
											fi
											;;
										remove)
											for player in ${*:5}; do
											 	server_eval $id "pardon $player"
											done
											if [[ $# > 5 ]]; then
												echo -n "Removed the following players from the blacklist: "
												echo -n "$5"
												for player in ${*:6}; do
												 	echo -n ", $player"
												done
												echo "."
											else
												echo "Removed \"$5\" from the blacklist."
											fi
											;;
										*)
											echo "Invalid command."
											;;
									esac
								fi
								;;
							ip)
								case "$4" in
									add)
										for address in ${*:5}; do
										 	server_eval $id "ban-ip $address"
										done
										if [[ $# > 5 ]]; then
											echo -n "Blacklisted the following ip addresses: "
											echo -n "$5"
											for player in ${*:6}; do
											 	echo -n ", $address"
											done
											echo "."
										else
											echo "Blacklisted \"$5\"."
										fi
										;;
									remove)
										for address in ${*:5}; do
										 	server_eval $id "pardon-ip $address"
										done
										if [[ $# > 5 ]]; then
											echo -n "Removed the following ip addresses from the blacklist: "
											echo -n "$5"
											for player in ${*:6}; do
											 	echo -n ", $address"
											done
											echo "."
										else
											echo "Removed \"$5\" from the ip blacklist."
										fi
										;;
									*)
										echo "Invalid command."
										;;
								esac
								;;
							list)
								local players=$(cat ${server_banned_players[$id]})
								
								local ips=$(cat ${server_banned_ips[$id]})

								if [[ -z "$players" && -z "$ips" ]]; then
									echo "The blacklist is empty."
								else
									if [[ ! -z "$players" ]]; then
										echo "Players:"
										for name in $players; do
											echo "    $name"
										done
									fi
									
									if [[ ! -z "$ips" ]]; then
										echo "IP Addresses:"
										for address in $ips; do
											echo "    $address"
										done
									fi
								fi
								;;
							*)
								echo "Invalid command."
								;;
						esac
						;;
					operator|op)
						case "$3" in
							add)
								if server_is_running $id; then
									server_eval $id "op $4"
									echo "The player \"$4\" is now an operator for the server."
								else
									echo "Server \"${server_name[$id]}\" is not running."
								fi
								;;
							remove)
								if server_is_running $id; then
									server_eval $id "deop $4"
									echo "The player \"$4\" is no longer an operator for the server."
								else
									echo "Server \"${server_name[$id]}\" is not running."
								fi
								;;
							*)
								echo "Invalid command"
								;;
						esac
						;;
					gamemode|gm)
						case "$3" in
							survival|creative|0|1)
								if [ -z "$4" ]; then
									echo "Invalid command."
								else
									if server_is_running $id; then
										case "$3" in
											creative|1) local mode=1;;
											survival|0) local mode=0;;
											*) echoerr "Invalid mode"; exit 1;;
										esac
										
										local line=$(server_eval_and_get_line $id "gamemode $4 $mode" "${server_confirm_gamemode[$id]}" "${server_confirm_gamemode_fail_no_user[$id]}" "${server_confirm_gamemode_fail_no_change[$id]}")

										local regex="${LOG_REGEX} ${server_confirm_gamemode[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "Changed game mode of \"$4\" to \"$3\"."
										fi
										local regex="${LOG_REGEX} ${server_confirm_gamemode_fail_no_user[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "The player \"$4\" was not found to be logged on."
										fi
										local regex="${LOG_REGEX} ${server_confirm_gamemode_fail_no_change[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "The player \"$4\" was already in \"$3\" mode."
										fi
									else
										echo "Server \"${server_name[$id]}\" is not running."
									fi
								fi
								;;
							*)
								echo "Invalid command."
								;;
						esac
						;;
					kick)
						if [ -z "$3" ]; then
							echo "Invalid command."
						else
							if server_is_running $id; then
								local line=$(server_eval_and_get_line $id "kick $3" "${server_confirm_kick[$id]}" "${server_confirm_kick_fail[$id]}")
								
								local regex="${LOG_REGEX} ${server_confirm_kick[$id]}"
								if [[ $line =~ $regex ]]; then
									echo "Kicked \"$3\" from game."
								fi
								local regex="${LOG_REGEX} ${server_confirm_kick_fail[$id]}"
								if [[ $line =~ $regex ]]; then
									echo "The player \"$3\" is not connected."
								fi
							else
								echo "Server \"${server_name[$id]}\" is not running."
							fi
						fi
						;;
					say)
						if [ -z "$3" ]; then
							echo "Invalid command."
						else
							if server_is_running $id; then
								server_eval $id "say ${*:3}"
								echo "Message sent to players."
							else
								echo "Server \"${server_name[$id]}\" is not running."
							fi
						fi
						;;
					time)
						case "$3" in
							set)
								if [ -z "$4" ]; then
									echo "Invalid command."
								else
									if server_is_running $id; then
										local line=$(server_eval_and_get_line $id "time set $4" "${server_confirm_time_set[$id]}" "${server_confirm_time_set_fail[$id]}")
										
										local regex="${LOG_REGEX} ${server_confirm_time_set[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "Set time to \"$4\"."
										fi
										local regex="${LOG_REGEX} ${server_confirm_time_set_fail[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "Unable to convert \"$4\" to a time."
										fi
									else
										echo "Server \"${server_name[$id]}\" is not running."
									fi
								fi
								;;
							add)
								if [ -z "$4" ]; then
									echo "Invalid command."
								else
									if server_is_running $id; then
										local line=$(server_eval_and_get_line $id "time add $4" "${server_confirm_time_add[$id]}" "${server_confirm_time_add_fail[$id]}")
										
										local regex="${LOG_REGEX} ${server_confirm_time_add[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "Added \"$4\" to time."
										fi
										local regex="${LOG_REGEX} ${server_confirm_time_add_fail[$id]}"
										if [[ $line =~ $regex ]]; then
											echo "Unable to convert \"$4\" to a time."
										fi
									else
										echo "Server \"${server_name[$id]}\" is not running."
									fi
								fi
								;;
							*)
								echo "Invalid command."
								;;
						esac
						;;
					toggledownfall|tdf)
						if server_is_running $id; then
							local line=$(server_eval_and_get_line $id "toggledownfall $3" "${server_confirm_toggledownfall[$id]}" "${server_confirm_toggledownfall_fail[$id]}")
							
							local regex="${LOG_REGEX} ${server_confirm_toggledownfall[$id]}"
							if [[ $line =~ $regex ]]; then
								echo ${line:36:(-3)}
							fi
							local regex="${LOG_REGEX} ${server_confirm_toggledownfall_fail[$id]}"
							if [[ $line =~ $regex ]]; then
								echo ${line:34:(-3)}
							fi
						else
							echo "Server \"${server_name[$id]}\" is not running."
						fi
						;;
					save)
						case "$3" in
							on)
								server_save_on $id
								;;
							off)
								server_save_off $id
								;;
							all)
								server_save_all $id
								;;
							*)
								echo "Invalid command."
								;;
						esac
						;;
					cmd)
						if [ -z "$3" ]; then
							echo "Invalid command."
						else
							if server_is_running $id; then
								server_eval $id "${*:3}"
								echo "Command sent."
							else
								echo "Server \"${server_name[$id]}\" is not running."
							fi
						fi
						;;
					cmdlog)
						if [ -z "$3" ]; then
							echo "Invalid command."
						else
							if server_is_running $id; then
								server_eval $id "${*:3}"
								echo "Now watching logs (press Ctrl+C to exit):"
								as_user ${server_user_name[$id]} "tail --follow --lines=0 --sleep-interval=0.1 ${server_log[$id]}"
							else
								echo "Server \"${server_name[$id]}\" is not running."
							fi
						fi
						;;
					console)
						if server_is_running $id; then
							as_user ${server_user_name[$1]} "screen -r ${server_screen_name[$1]}"
						else
							echo "Server \"${server_name[$id]}\" is not running."
						fi
						;;
					*)
						echo "Invalid command."
						;;
				esac
			else
				echo "No server with that name."
			fi
			;;
	esac
}


### Start point

main "$@"
exit 0