#

# set -o errexit -o noglob are assumed.

#

# N.B.	URLs ($1) may contain `?' or '&' characters.

pkgp_fetch() {

	local _url="${1}" _sha256sum_src="${2}";

	if [ -z "${3}" ]; then

		_url_dst="${DLCACHEDIR}/$(basename "${_url}")";

	else

		_url_dst="${DLCACHEDIR}/${3}";

	fi;

	if [ "${ARG_OFFLINE:-0}" -eq 1 ]\

	|| [ -e "${_url_dst}.fetched" ]; then

		return 0;

	else

		wget ${WGET_ARGS} -c -O "${_url_dst}" "${_url}";

	fi;

	if [ -n "${_sha256sum_src}" ]; then

		set -- $(openssl dgst -sha256 "${_url_dst}"); shift $((${#}-1));

		if [ "${_sha256sum_dst:=${1}}" != "${_sha256sum_src}" ]; then

			if [ "${ARG_IGNORE_SHA256SUMS:-0}" -eq 0 ]; then

				log_msg failexit "Error: hash mismatch for URL \`${_url}' (is: ${_sha256sum_dst}, should be: ${_sha256sum_src}.)";

			else

				log_msg warn "Warning: hash mismatch for URL \`${_url}' (is: ${_sha256sum_dst}, should be: ${_sha256sum_src}.)";

			fi;

		fi;

	fi;

	touch "${_url_dst}.fetched";

};

pkgp_fetch_git() {

	local _subdir="${1}" _url="${2}" _branch="${3}";

	if [ "${ARG_OFFLINE:-0}" -eq 0 ]; then

		if [ -e "${DLCACHEDIR}/${_subdir}" ]; then

			(build_fileop cd "${DLCACHEDIR}/${_subdir}" &&\

				git pull origin "${_branch:-main}");

		else

			git clone "${_url}" "${DLCACHEDIR}/${_subdir}";

			if [ -n "${_branch}" -a		\

			     \( -z "${_branch#main}" \) -a	\

			     \( -z "${_branch#master}" \) ]; then

				(build_fileop cd "${DLCACHEDIR}/${_subdir}"	&&\

					git checkout -b "${_branch}");

			fi;

		fi;

	fi;

	build_fileop rm "${WORKDIR}/${_subdir}";

	build_fileop cp "${DLCACHEDIR}/${_subdir}" "${WORKDIR}";

};

pkgp_fetch_urls_git() {

	local _url_spec _subdir _url _git_branch;

	for _url_spec in ${@}; do

		_subdir="${_url_spec%=*}";

		_url="${_url_spec#*=}";

		_url="${_url%@*}";

		if [ "${_url_spec#*@}" != "${_url_spec}" ]; then

			_git_branch=${_url_spec#*@};

		fi;

		pkgp_fetch_git ${_subdir} ${_url} ${_git_branch};

	done;

};

pkg_fetch() {

	if [ -n "${1}" ]; then

		if [ "${1}" = "-git" ]; then

			shift; pkgp_fetch_urls_git "${1}";

		else

			pkgp_fetch "${1}" "${2}";

		fi;

	else

		if [ -n "${PKG_URL}" ]; then

			pkgp_fetch "${PKG_URL}" "${PKG_SHA256SUM}" "${PKG_FNAME}";

		fi;

		if [ -n "${PKG_URLS_GIT}" ]; then

			pkgp_fetch_urls_git "${PKG_URLS_GIT}";

		fi;

	fi;

};

# vim:filetype=sh