#

# . ./build.vars and set -o errexit -o noglob are assumed.

# See warning at the top of build.vars.

#

cpu_get_fnames() {

	case "${cu_url}" in

	*://github.com/*)

		_cpugf_uname="${cu_url#*/github.com/}";

		_cpugf_uname="${_cpugf_uname%%/*}";

		_cpugf_pname="${cu_url#*/github.com/${_cpugf_uname}/}";

		_cpugf_pname="${_cpugf_pname%%/*}";

		cu_url_index="https://github.com/${_cpugf_uname%%/*}/${_cpugf_pname%%/*}/releases/";

		unset _cpu_uname _cpu_pname;

		cu_fnames="$(wget ${WGET_ARGS} -qO- ${cu_url_index}	|\

			sed -n '//s/^.*\([a-zA-Z]\+-\|v\|\)\(.\+\)<\/span>.*$/\2/p')";

		cu_fname_base="${cu_name}";

		cu_fname_ext="${cu_fname#v${cu_version}.}";

		;;

	*/libgpg-error/*)

		cu_url_index="${cu_url%/*}/";

		cu_fnames="$(wget ${WGET_ARGS} -qO- "${cu_url_index}"	|\

			sed -n '/href="[^"]\+"/s/^.*href="\([^"]\+\)".*$/\1/p')";

		cu_fname_base="libgpg-error";

		;;

	*/util-linux/*)

		cu_fname_base="util_linux";

		cu_url_index="https://www.kernel.org/pub/linux/utils/util-linux/";

		cu_fnames="$(wget ${WGET_ARGS} -qO- ${cu_url_index}		|\

			sed -n '/href="[^"]\+"/{s/^.*href="\([^"]\+\)".*$/\1/;s/\/$//;p}')";

		;;

	*)

		cu_url_index="${cu_url%/*}/";

		cu_fnames="$(wget ${WGET_ARGS} -qO- "${cu_url_index}"	|\

			sed -n '/href="[^"]\+"/s/^.*href="\([^"]\+\)".*$/\1/p')";

		;;

	esac;

	: ${cu_fname:="${cu_url##*/}"};

	: ${cu_fname_base:="${cu_fname%%-*}"};

	: ${cu_fname_ext:="${cu_fname#${cu_fname_base}-${cu_version}.}"};

};

cpu_get_version() {

	case "${cu_url}" in

	*://github.com/*)

		cu_fname_version="${cu_fname}"; ;;

	*/util-linux/*)

		cu_fname_version="${cu_fname#v}"; ;;

	*)	if ! [ "${cu_fname#${cu_fname_base}-}" = "${cu_fname}" ]\

		&& ! [ "${cu_fname%.${cu_fname_ext}}" = "${cu_fname}" ]; then

			cu_fname_version="${cu_fname#${cu_fname_base}-}";

			cu_fname_version="${cu_fname_version%.${cu_fname_ext}}";

		fi;

		;;

	esac;

};

check_pkg_updates() {

	cu_name="${1}"; cu_version="${2}"; cu_url="${3}"; cu_url_type="${4}";

	if match_list "${CHECK_UPDATES_SKIP}" " " "${cu_name}"; then

		log_msg vnfo "Skipping \`${cu_name}' (set in \${CHECK_UPDATES_SKIP}.)";

		return 0;

	elif [ "${cu_url_type}" = "git" ]; then

		log_msg vnfo "Skipping \`${cu_name}' (URL_TYPE is Git.)";

		return 0;

	elif [ -z "${cu_version}" -o -z "${cu_url}" ]; then

		log_msg fail "Zero-length \${cu_version} and/or \${cu_url} for \`${cu_name}' (ignored.)";

		return 0;

	else

		log_msg vnfo "Checking ${cu_name} v${cu_version} for updates.";

		cpu_get_fnames; _cpu_versions="";

	fi;

	for cu_fname in ${cu_fnames}; do

		cu_fname="${cu_fname##*/}"; cpu_get_version;

		if [ -z "${cu_fname_version}" ]					\

		|| ! echo "${cu_fname_version}" | grep -Eq '^[-_.0-9a-zA-Z]+$'	\

		||   echo "${cu_fname_version}" | grep -Eq '^[_.a-zA-Z]+'; then

			log_msg varn "Skipping \`${cu_fname_version}' (empty/invalid version.)";

		else

			_cpu_versions="${_cpu_versions:+${_cpu_versions} }${cu_fname_version}";

		fi;

	done;

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

		log_msg warn "No versions available for \`${cu_name}' (Filename URL: ${cu_url}, index URL: ${cu_url_index}).";

	else

		_cpu_versions="$(echo "${_cpu_versions}"	|\

			sed 's/ /\n/g' | sort -rV | uniq	|\

			head -n${CHECK_UPDATES_SHOW_NEW:-6}	|\

			paste -d" " -s)";

		if [ "${_cpu_versions%% *}" != "${cu_version}" ]; then

			log_msg info "New release(s) available for ${cu_name} v${cu_version}: ${_cpu_versions}.";

		else

			log_msg vnfo "${cu_name} v${cu_version} is up to date.";

		fi;

	fi;

	unset	cu_fname cu_fname_base cu_fname_ext cu_fnames cu_fname_version	\

		cu_name cu_url cu_url_fname cu_url_fname_base cu_url_fname_ext	\

		cu_url_index cu_url_type cu_version _cpu_versions;

};

# vim:filetype=sh