set -e

check_function () {
    if [ ! "$(type -t "${1}")" = "function" ]; then
        echo ">>> Function '${1}' is not defined!"
        return 1
    fi
    return 0
}

do_prepare () {
    prepare

    cd "${wd}"
}

do_build () {
    build

    cd "${wd}"
}

do_package () {
    package

    cd "${wd}"
    fakeroot tar -C "${pkgdir}" -cf - . | \
        xz -9 -T 0 -vvv \
        > "${pkgname}-${pkgver}.pkg.tar.xz"

}

[ -z "${pkgname}" ] && ( echo ">>> pkgname is not defined"; exit 1 );
[ -z "${pkgver}" ] && ( echo ">>> pkgver is not defined"; exit 1 );

check_function prepare || exit 1
check_function build || exit 1
check_function package || exit 1

wd="$(pwd)"
srcdir="$(mktemp -d /tmp/buildpkg-src.XXXXXXX)"
pkgdir="$(mktemp -d /tmp/buildpkg-bin.XXXXXXX)"

do_prepare
do_build
do_package

rm -rf "${srcdir}"
rm -rf "${pkgdir}"