#!/bin/bash

# Usage:

#     ./rename-tarball original-name.tar.gz new-name.tar.gz

set -euo pipefail

IFS=$'\n\t'

positional_args=()

while [[ "$#" -gt 0 ]]; do

    arg="${1}"

    case "${arg}" in

        -h|--help)

            print_usage

            exit 0

            ;;

        *)

            positional_args+=("$1")

            shift

            ;;

    esac

done

original_name=${positional_args[0]:-}

if [[ -z ${original_name} ]]; then

    echo "error: missing original tarball name"

    exit 1

fi

new_name=${positional_args[1]:-}

if [[ -z ${new_name} ]]; then

    echo "error: missing new tarball name"

    exit 1

fi

original_name=${original_name/%.tar.gz}

new_name=${new_name/.tar.gz}

echo "Original: ${original_name}.tar.gz"

echo "New name: ${new_name}.tar.gz"

mkdir "temp-${new_name}"

pushd "temp-${new_name}"

tar xf "../${original_name}.tar.gz"

mv "${original_name}" "${new_name}"

tar czf ../"${new_name}.tar.gz" "${new_name}"

rm -rf "${new_name}"

popd

rmdir "temp-${new_name}"