Quickly launch a paper server with TreeFeller Plugin

paper-launcher.sh

get_paper() {
    PAPER_VERSION=$(curl -s https://api.papermc.io/v2/projects/paper | jq '.versions | .[-1]' | sed 's/^.\(.*\).$/\1/')
    BUILD_VERSION=$(curl -s https://api.papermc.io/v2/projects/paper/versions/$PAPER_VERSION | jq '.builds | .[-1]')

    for file in paper-*.jar; do
        if [ $file = paper-$PAPER_VERSION-$BUILD_VERSION.jar ]; then
            continue
        fi

        rm -f $file
    done

    if [ ! -f paper-$PAPER_VERSION-$BUILD_VERSION.jar ]; then
        curl -so paper-$PAPER_VERSION-$BUILD_VERSION.jar https://api.papermc.io/v2/projects/paper/versions/$PAPER_VERSION/builds/$BUILD_VERSION/downloads/paper-$PAPER_VERSION-$BUILD_VERSION.jar
    fi
}

###### DEBUG: Vanilla Server ######
get_server() {
    curl -sLO $(curl -sA "Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/81.0" https://www.minecraft.net/en-us/download/server | grep -o 'https://.*\.jar' | sed 's/".*//')
}
###################

config_paper() {
    MEMORY_LEFT=$((($(free -k | awk 'NR==2{print $4 + $6}') / 1024 - 2048)))
    SWAP_LEFT=$(free -m | awk '/Swap/ {print $4}')
    TOTAL_MEMORY=$((MEMORY_LEFT + SWAP_LEFT))

    if [ $MEMORY_LEFT -lt 2048 ]; then
        if [ $SWAP_LEFT -eq 0 ]; then
            echo -e "\e[31mError: Not enough memory available and no swap space available."
            echo -e "Need at least 2048MiB of memory.\e[00m"
            exit 1
        fi

        read -p "Not enough memory available, but swap space is present. Do you want to use swap space? [yes/no]: " USE_SWAP

        if [ "$USE_SWAP" != "yes" ]; then
            echo "Exiting..."
            exit 1
        fi

        ALLOCATED_MEMORY=$((TOTAL_MEMORY - (2048 % 1024)))

        if [ $ALLOCATED_MEMORY -lt 2048 ]; then
            echo -e "\e[31mError: Not enough memory available even with swap."
            echo -e "Exiting...\e[00m"
            exit 1
        fi
    else
        ALLOCATED_MEMORY=$((MEMORY_LEFT - (2048 % 1024)))
    fi

    read -p "Do you want to specify your own RAM value? [yes/no]: " SPECIFY_RAM

    if [ "$SPECIFY_RAM" = "yes" ]; then
        read -p "Enter the desired RAM value in MB: " CUSTOM_RAM
        ALLOCATED_MEMORY=$(((CUSTOM_RAM + 1023) / 1024 * 1024))

        if [ $ALLOCATED_MEMORY -gt $TOTAL_MEMORY ]; then
            echo -e "\e[31mError: Specified RAM value exceeds available memory."
            echo -e "Exiting...\e[00m"
            exit 1
        fi

        if [ $ALLOCATED_MEMORY -lt 1024 ]; then
            echo "Specified RAM value is less than 1GB. Setting allocated memory to 1GB."
            ALLOCATED_MEMORY=1024
        fi

        echo "Allocating Memory: $ALLOCATED_MEMORY MB"
    fi

    if [ $ALLOCATED_MEMORY -eq 0 ]; then
        ALLOCATED_MEMORY=$((MEMORY_LEFT - (2048 % 1024)))

        if [ $ALLOCATED_MEMORY -lt 1024 ]; then
            echo "Calculated allocated memory is less than 1GB. Setting allocated memory to 1GB."
            ALLOCATED_MEMORY=1024
        fi
    fi
}

accept_eula() {
    if [ ! -f "eula.txt" ]; then
        echo -e "#By changing the setting below to TRUE you are indicating your agreement to our EULA (https://aka.ms/MinecraftEULA).\n#$(date)\neula=true" >eula.txt
    fi
}

config_server() {
    if [ ! -f "server.properties" ]; then
        echo 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 | base64 -d | tee server.properties
        echo ""
        read -p "Do you want to edit server.properties? [yes/no]: " EDIT_SERVER_PROPERTIES
    fi

    if [ "$EDIT_SERVER_PROPERTIES" = "yes" ]; then
        if command -v nano &>/dev/null; then
            editor="nano"
        elif command -v vim &>/dev/null; then
            editor="vim"
        else
            echo "No editor found. Cannot edit server.properties."
            exit 1
        fi

        $editor server.properties
    else
        echo "Skipping server.properties editing."
    fi
}

launch_paper() {
    java -Xms1024M -Xmx${ALLOCATED_MEMORY}M -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 \
        -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch \
        -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M \
        -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 \
        -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 \
        -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem \
        -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs \
        -Daikars.new.flags=true -jar paper-$PAPER_VERSION-$BUILD_VERSION.jar --nogui
}

purge_all() {
    for item in *; do
        if [[ "$item" == "start.sh" || "$item" == "debug.sh" ]]; then
            continue
        fi
        rm -rf "$item"
    done
}

add_plugins() {
   mkdir -p plugins; cd plugins

   echo Adding TreeFeller Plugin
   filename=$(curl -s https://dev.bukkit.org/projects/thizzyz-tree-feller | grep -o '>TreeFeller-*.*' | cut -c 2- | rev | cut -c 5- | rev)
   rm TreeFeller-*.jar
   wget -q -O $filename "https://dev.bukkit.org/projects/thizzyz-tree-feller/files/latest"

   # Adding Spark Plugin
   # filename=$(curl -s https://ci.lucko.me/job/spark/lastSuccessfulBuild/artifact/spark-bukkit/build/libs/ | grep -oP 'spark-.*?-bukkit\.jar' | head -n 1)
   # rm spark-*.jar
   # curl -sO "https://ci.lucko.me/job/spark/lastSuccessfulBuild/artifact/spark-bukkit/build/libs/$filename"

   cd ..
}

if [[ "$1" == "--purge" ]]; then
    purge_all
    exit
fi

get_paper
config_paper
accept_eula
config_server
add_plugins
launch_paper