versions

#!/usr/bin/env bash
#*******************************************************************************
# Copyright (c) 2020 Eclipse Foundation and others.
# This program and the accompanying materials are made available
# under the terms of the Eclipse Public License 2.0
# which is available at http://www.eclipse.org/legal/epl-v20.html,
# or the MIT License which is available at https://opensource.org/licenses/MIT.
# SPDX-License-Identifier: EPL-2.0 OR MIT
#*******************************************************************************

# shellcheck disable=SC1090
. "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")/_bootstrap.shsource"

# from https://stackoverflow.com/a/4025065
compare () {
    if [[ "${1}" == "${2}" ]]; then
        echo "0"
        return
    fi

    local IFS=.
    read -ra ver1 <<< "${1}"
    read -ra ver2 <<< "${2}"

    local i
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++)); do
        ver1[i]=0
    done

    for ((i=0; i<${#ver1[@]}; i++)); do
        if [[ -z ${ver2[i]:-} ]]; then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]})); then
            echo "1"
            return
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]})); then
            echo "-1"
            return
        fi
    done

    echo "0"
}

# shellcheck disable=SC2068
$@