#
# set -o errexit -o noglob are assumed.
#

ex_pkg_steps() {
	local _tgt_name="${1}" _pkg_name="${2}"				\
		_restart="${3}" _restart_at="${4}"			\
		_step _step_type					\
		_step_cmds _step_cmd_args				\
		_step_cmd_pfx _step_cmd _step_next;
	set -- $(ex_lfilter_not "${BUILD_STEPS}" "${PKG_BUILD_STEPS_DISABLE}");
	while [ ${#} -gt 0 ]; do
		_step="${1}"; _step_next="${2}";
		_step_cmds=""; _step_cmd_args="";
		_step_type="${_step#*:}";
		_step="${_step%%:*}";
		_step_cmd_pfx="pkg_${_pkg_name}_${_step}";
		case "${_step_type}" in
		dynamic)
			if [ "${_tgt_name}" = "INVARIANTS" ]; then
				_step_cmds="${_step_cmd_pfx} pkg_${_step}";
			elif [ -n "${_restart}" ]; then
				if [ -z "${_restart_at}" ]\
				|| ex_lmatch "${_restart_at}" , "${_step}"; then
					_step_cmds="${_step_cmd_pfx} pkg_${_step}";
				fi;
			elif ! ex_pkg_state_test "${_pkg_name}" "${_step}"; then
				_step_cmds="${_step_cmd_pfx} pkg_${_step}";
			fi; ;;
		invariant)
			_step_cmds="pkg_${_step}"; ;;
		variant)
			if ex_lmatch "${_restart_at}" "," "${_step}"; then
				_step_cmds="${_step_cmd_pfx} pkg_${_step}";
			fi; ;;
		virtual)
			_step_cmds="pkg_${_pkg_name}_${_step}";
			_step_cmd_args="${_restart_at:-ALL}"; ;;
		all)
			if ex_test_cmd "pkg_${_pkg_name}_${_step}"; then
				"${_step_cmd_pfx}" "${_restart_at:-ALL}";
				break;
			fi; ;;
		finish)	ex_pkg_state_push "${_pkg_name}" finish; ;;
		*)	;;
		esac;
		for _step_cmd in ${_step_cmds}; do
			if ex_test_cmd "${_step_cmd}"; then
				ex_test_cmd "${_step_cmd_pfx}_pre"	\
					&& "${_step_cmd_pfx}_pre"
				"${_step_cmd}" ${_step_cmd_args};
				ex_test_cmd "${_step_cmd_pfx}_post"	\
					&& "${_step_cmd_pfx}_post"
				if [ "${_step_type}" != "invariant" ]	\
				&& [ -n "${_step_next}" ]; then
					ex_pkg_state_push "${_pkg_name}" "${_step}";
					ex_pkg_state_push "${_pkg_name}" "-${_step_next}";
				else
					ex_pkg_state_push "${_pkg_name}" "${_step}";
				fi; break;
			fi;
		done;
	shift; done;
};

# vim:filetype=sh