Utility script to easily run the BuildTools provided by Spigot

buildtools.sh

#!/bin/bash

# checks if this script was executed correctly
if (( $# == 0 )); then
    echo -e "Usage: $0 <version> [Java path]"
    exit 2
fi

digit_regex="^[0-9]+$"

version=$1
IFS="."

read -ra version_numbers <<< "$version"
version_length=${#version_numbers[@]}

# checks if the version is right
echo -e "Checking the version..."
if (( $version_length < 2 )) || (( $version_length > 3 )); then
    echo -e "Invalid version. It must be in the MAJOR.MINOR or MAJOR.MINOR.PATCH format"
    exit 2
fi

for i in ${version_numbers[@]}; do
    if [[ "$i" =~ $digit_regex ]]; then
        continue
    fi
    echo -e "The version numbers must be a number!"
    exit 2
done
echo -e "Chosen version: $version\n\n\n"

# initializes some variables
root_dir="${version_numbers[0]}.${version_numbers[1]}"
dir="$version"
full_dir="$root_dir/$dir"

# create the necessary directories
echo -e "Creating directories..."
if ! [ -d "$root_dir" ]; then
    mkdir "$root_dir"
fi
cd "$root_dir"
if [ -d "$dir" ]; then
    echo -e "Deleting the $full_dir directory because it already exists..."
    rm -rf "$dir"
fi
mkdir "$dir" && cd "$dir"
echo -e "Created all directories!\n\n\n"

# downloads the BuildTools
echo -e "Downloading BuildTools..."
curl -O https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar
echo -e "BuildTools downloaded!\n\n\n"

# executes the BuildTools
echo -e "Executing BuildTools..."
java_path="java"
if (( $# < 2 )); then
    echo -e "The Java path was not provided. Using 'java' as default..."
else
    java_path=$2
fi

$java_path -jar BuildTools.jar --rev "$version"
echo -e "\n\n\nBuildTools executed!"

exit 0