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#
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# set -o errexit -o noglob are assumed.
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#
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# N.B.	URLs ($1) may contain `?' or '&' characters.
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pkgp_fetch() {
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	local _url="${1}" _sha256sum_src="${2}";
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	if [ -z "${3}" ]; then
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		_url_dst="${DLCACHEDIR}/$(basename "${_url}")";
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	else
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		_url_dst="${DLCACHEDIR}/${3}";
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	fi;
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	if [ "${ARG_OFFLINE:-0}" -eq 1 ]\
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	|| [ -e "${_url_dst}.fetched" ]; then
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		return 0;
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	else
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		wget ${WGET_ARGS} -c -O "${_url_dst}" "${_url}";
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	fi;
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	if [ -n "${_sha256sum_src}" ]; then
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		set -- $(openssl dgst -sha256 "${_url_dst}"); shift $((${#}-1));
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		if [ "${_sha256sum_dst:=${1}}" != "${_sha256sum_src}" ]; then
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			if [ "${ARG_IGNORE_SHA256SUMS:-0}" -eq 0 ]; then
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				log_msg failexit "Error: hash mismatch for URL \`${_url}' (is: ${_sha256sum_dst}, should be: ${_sha256sum_src}.)";
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			else
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				log_msg warn "Warning: hash mismatch for URL \`${_url}' (is: ${_sha256sum_dst}, should be: ${_sha256sum_src}.)";
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			fi;
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		fi;
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	fi;
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	touch "${_url_dst}.fetched";
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};
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pkgp_fetch_git() {
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	local _subdir="${1}" _url="${2}" _branch="${3}";
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	if [ "${ARG_OFFLINE:-0}" -eq 0 ]; then
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		if [ -e "${DLCACHEDIR}/${_subdir}" ]; then
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			(build_fileop cd "${DLCACHEDIR}/${_subdir}" &&\
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				git pull origin "${_branch:-main}");
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		else
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			git clone "${_url}" "${DLCACHEDIR}/${_subdir}";
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			if [ -n "${_branch}" -a		\
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			     \( -z "${_branch#main}" \) -a	\
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			     \( -z "${_branch#master}" \) ]; then
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				(build_fileop cd "${DLCACHEDIR}/${_subdir}"	&&\
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					git checkout -b "${_branch}");
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			fi;
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		fi;
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	fi;
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	build_fileop rm "${WORKDIR}/${_subdir}";
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	build_fileop cp "${DLCACHEDIR}/${_subdir}" "${WORKDIR}";
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};
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pkgp_fetch_urls_git() {
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	local _url_spec _subdir _url _git_branch;
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	for _url_spec in ${@}; do
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		_subdir="${_url_spec%=*}";
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		_url="${_url_spec#*=}";
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		_url="${_url%@*}";
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		if [ "${_url_spec#*@}" != "${_url_spec}" ]; then
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			_git_branch=${_url_spec#*@};
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		fi;
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		pkgp_fetch_git ${_subdir} ${_url} ${_git_branch};
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	done;
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};
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pkg_fetch() {
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	if [ -n "${1}" ]; then
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		if [ "${1}" = "-git" ]; then
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			shift; pkgp_fetch_urls_git "${1}";
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		else
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			pkgp_fetch "${1}" "${2}";
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		fi;
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	else
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		if [ -n "${PKG_URL}" ]; then
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			pkgp_fetch "${PKG_URL}" "${PKG_SHA256SUM}" "${PKG_FNAME}";
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		fi;
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		if [ -n "${PKG_URLS_GIT}" ]; then
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			pkgp_fetch_urls_git "${PKG_URLS_GIT}";
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		fi;
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	fi;
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};
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# vim:filetype=sh