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

ex_pkg_dispatch() {
	local _tgt_name="${1}" _pkg_name="${2}"		\
		_restart="${3}" _restart_at="${4}"	\
		_pkg_step_cmds _pkg_step_cmd_args;
	if [ "${_pkg_name#*_flavour_*}" != "${_pkg_name}" ]; then
		PKG_NAME_PARENT="${_pkg_name%_flavour_*}";
	fi;
	(set -o errexit -o noglob;
	ex_pkg_vars; ex_pkg_env;
	ex_build_fileop mkdir "${PKG_BASE_DIR}";
	ex_build_fileop cd "${PKG_BASE_DIR}";
	if [ -n "${_restart}" ]\
	|| [ "${_tgt_name}" = "INVARIANTS" ]\
	|| ! ex_pkg_state_test "${_pkg_name}" finish; then
		set -- $(ex_lfilter -not "${BUILD_STEPS}"	\
				"$(ex_get_var_unsafe PKG_$(ex_toupper "${_pkg_name}")_BUILD_STEPS_DISABLE)");
		while [ ${#} -gt 0 ]; do
			_pkg_step_cmds=""; _pkg_step_cmd_args="";
			case "${1#*:}" in
			dynamic)
				if [ "${_tgt_name}" = "INVARIANTS" ]; then
					_pkg_step_cmds="pkg_${_pkg_name}_${1%:*} pkg_${1%:*}";
				elif [ -n "${_restart}" ]; then
					if [ -z "${_restart_at}" ]\
					|| ex_lmatch "${_restart_at}" , "${1%:*}"; then
						_pkg_step_cmds="pkg_${_pkg_name}_${1%:*} pkg_${1%:*}";
					fi;
				elif ! ex_pkg_state_test "${_pkg_name}" "${1%:*}"; then
					_pkg_step_cmds="pkg_${_pkg_name}_${1%:*} pkg_${1%:*}";
				fi; ;;
			invariant)
				_pkg_step_cmds="pkg_${1%:*}"; ;;
			variant)
				if ex_lmatch "${_restart_at}" "," "${1%:*}"; then
					_pkg_step_cmds="pkg_${_pkg_name}_${1%:*} pkg_${1%:*}";
				fi; ;;
			virtual)
				_pkg_step_cmds="pkg_${_pkg_name}_${1%:*}";
				_pkg_step_cmd_args="${_restart_at:-ALL}"; ;;
			all)
				if ex_test_cmd "pkg_${_pkg_name}_${1%:*}"; then
					"pkg_${_pkg_name}_${1%:*}" "${_restart_at:-ALL}";
					break;
				fi; ;;
			finish)	ex_pkg_state_push "${_pkg_name}" finish; ;;
			*)	;;
			esac;
			for __ in ${_pkg_step_cmds}; do
				if ex_test_cmd "${__}"; then
					ex_test_cmd "pkg_${_pkg_name}_${1%:*}_pre"	\
						&& "pkg_${_pkg_name}_${1%:*}_pre"
					"${__}" ${_pkg_step_cmd_args};
					ex_test_cmd "pkg_${_pkg_name}_${1%:*}_post"	\
						&& "pkg_${_pkg_name}_${1%:*}_post"
					if [ "${1#*:}" != "invariant" ]\
					&& [ ${#} -ge 2 ]; then
						ex_pkg_state_push "${_pkg_name}" "${1%:*}" "-${2#*:}";
					else
						ex_pkg_state_push "${_pkg_name}" "${1%:*}";
					fi; break;
				fi;
			done;
		shift; done;
	fi); return ${?};
};

# vim:filetype=sh