Quick tool for minecraft servers.

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#!/usr/bin/env bash

# Copyright (C) 2015-2018 Joel Murphy
# All rights reserved

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

PROP_FILE=server.properties
SHOULD_START=false

generate_seed() {
    SEED="$((0x$(echo $(cat /dev/urandom | head -c 8 | od -A n -t x8) | tr -d '[:space:]')))"
}

random_world() {
    generate_seed
    if [ -f ${PROP_FILE} ]
    then
        sed -i "~" "s/level-seed=.*/level-seed=${SEED}/g" ${PROP_FILE}
    else
        touch ${PROP_FILE}
        echo "#Minecraft server properties" >> ${PROP_FILE}
        echo "#$(date)" >> ${PROP_FILE}
        echo "level-seed=${SEED}" >> ${PROP_FILE}
    fi
    echo -e "$(grep 'level-seed' ./${PROP_FILE} | sed 's/\(.*\)=\(.*\)/\\e[0;32m\1\\e[0m=\\e[1;33m\2\\e[0m/')"
}

make_backup() {
    if [[ ! -e "./backups" ]]; then
        mkdir ./backups
    fi
    7z a ./backups/$(date -j "+%Y%m%d_%H%M%S.7z") ./assets ./world
}

MEMUSE=${MCMEMUSE:-'4G'}

#for c in $*
while (( "$#" ))
do
    case "$1" in
        -*)
            DASH1="${1:1}"
            case "$DASH1" in
                m)
                    MEMUSE=${2}
                    shift
                    ;;
                *)
                    echo "Unrecognized switch: ${1}"
                    ;;
            esac
            ;;
        start)
            SHOULD_START=true
            ;;
        random-world)
            random_world
            ;;
        reset-world)
            rm -rf world
            ;;
        backup)
            make_backup
            ;;
        test)
            echo "MEMUSE=${MEMUSE}"
            ;;
        *)
            echo "Unknown command: ${1}"
            ;;
    esac
shift
done

if [[ $SHOULD_START == true ]]; then
            echo "Starting server.jar with ${MEMUSE}"
            java -jar -Xms${MEMUSE} -Xmx${MEMUSE} server.jar nogui
fi