#!/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}"