#

# set -o noglob is assumed.

# WARNING: ex_pkg_dispatch(), its caller, and its callers must _NOT_ be executed

# as part of conditional evaluation, e.g. if, until, while, !, or && and ||, as

# doing so would inhibit set -o errexit during execution of this function and its

# subshell(!).  Instead, call ex_pkg_dispatch() and subsequently evaluate ${?}.

#

exp_pkg_dispatch() {

	local _pkg_name="${1}" _tgt_name="${2}" _restart_at="${3}"				\

		_dispatch_fn="${4}" _stderrout_path="${5}" _pipe_path="${6}"			\

		_njobs_vname="${7}" _pkg_name_uc;

	_pkg_name_uc="$(ex_rtl_toupper "${_pkg_name}")";

	if [ -n "$(ex_rtl_get_var_unsafe PKG_${_pkg_name_uc}_DISABLED)" ]; then

		"${_dispatch_fn}" disabled_pkg "${_pkg_name}" "${_tgt_name}";

	elif ex_pkg_state_test "${_pkg_name}" finish\

	&& [ -z "${_restart_at}" ]; then

		"${_dispatch_fn}" skipped_pkg "${_pkg_name}" "${_tgt_name}";

	else

		_stderrout_path="${BUILD_WORKDIR}/${_pkg_name}_stderrout.log";

		"${_dispatch_fn}" start_pkg "${_pkg_name}" "${_tgt_name}";

		(set -o errexit -o noglob; BUILD_IS_PARENT=0;

		ex_pkg_env "${_pkg_name}" "${_tgt_name}" "${_restart_at}";

		trap "if [ \${?} -eq 0 ]; then							\

			echo \"done ${_pkg_name} ${_tgt_name}\" >&3;				\

		      else									\

			echo \"fail ${_pkg_name} ${_tgt_name}\" >&3;				\

		      fi;" EXIT HUP INT TERM USR1 USR2;

		ex_pkg_exec "${_pkg_name}" "${_tgt_name}" "${_restart_at}"			\

			"${_dispatch_fn}";) 1>"${_stderrout_path}" 2>&1 3>"${_pipe_path}" &

		: $((${_njobs_vname}+=1));

	fi;

};

ex_pkg_dispatch() {

	local _tgt_name="${1}" _restart="${2}" _restart_at="${3}"				\

		_dispatch_fn="${4}" _tgt_name_uc						\

		_pkg_names _njob _njobs _njobs_max						\

		_pipe_path _stderrout_path _pipe_msg _script_rc;

	ex_rtl_fileop mkdir "${BUILD_WORKDIR}";

	_pipe_path="${BUILD_WORKDIR}/build.fifo";

	_tgt_name_uc="$(ex_rtl_toupper "${_tgt_name}")";

	"${_dispatch_fn}" start_target "" "${_tgt_name}";

	_pkg_names="$(ex_rtl_get_var_unsafe ${_tgt_name_uc}_PACKAGES)";

	if [ -n "${_restart}" ]\

	&& [ "${_restart}" != ALL ]; then

		_pkg_names="$(ex_rtl_lfilter "${_pkg_names}" "${_restart}")";

	fi;

	if [ "$(ex_rtl_get_var_unsafe ${_tgt_name_uc}_PARALLELISE)" = 1 ]\

	&& [ "${ARG_PARALLEL:-0}" -gt 1 ]; then

		_njobs_max="${DEFAULT_BUILD_CPUS}";

	else

		_njobs_max=1;

	fi;

	set -- ${_pkg_names};

	while [ ${#} -gt 0 ]; do

		_script_rc=0; _njobs=0;

		ex_rtl_fileop mkfifo "${_pipe_path}";

		for _njob in $(seq 1 $((${_njobs_max}-${_njobs}))); do

			if [ ${#} -eq 0 ]; then

				break;

			else

				exp_pkg_dispatch "${1}" "${_tgt_name}"				\

					"${_restart_at}" "${_dispatch_fn}"			\

					"${_stderrout_path}" "${_pipe_path}"			\

					_njobs; shift;

			fi;

		done;

		if [ "${_njobs:-0}" -gt 0 ]; then

			while read _pipe_msg; do

			case "${_pipe_msg%% *}" in

			done)	"${_dispatch_fn}" finish_pkg ${_pipe_msg#done };

				: $((_njobs-=1));

				for _njob in $(seq 1 $((${_njobs_max}-${_njobs}))); do

					if [ ${#} -eq 0 ]; then

						break;

					else

						exp_pkg_dispatch "${1}" "${_tgt_name}"		\

							"${_restart_at}" "${_dispatch_fn}"	\

							"${_stderrout_path}" "${_pipe_path}"	\

							_njobs; shift;

					fi;

				done;

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

					break;

				fi; ;;

			fail)	_script_rc=1;

				"${_dispatch_fn}" fail_pkg ${_pipe_msg#fail };

				[ $((_njobs-=1)) -eq 0 ] && break; ;;

			step)	"${_dispatch_fn}" step_pkg ${_pipe_msg#step }; ;;

			esac; done <>"${_pipe_path}";

		fi;

		ex_rtl_fileop rm "${_pipe_path}";

		if [ "${_script_rc:-1}" -eq 1 ]; then

			return "${_script_rc}";

		fi;

	done;

	"${_dispatch_fn}" finish_target "" "${_tgt_name}";

};

# vim:filetype=sh