#

# set +o errexit -o noglob is assumed.

#

#

# exp_pkg_dispatch_complete() - XXX

# @_dispatch_fn:	top-level dispatch function name

# @_group_names:	build group name(s)

# @_pkg_disabled:	list of disabled packages

# @_pkg_finished:	list of finished packages

#

# Return:		zero (0) on success, non-zero (>0) on failure.

#

exp_pkg_dispatch_complete() {

	local _dispatch_fn="${1}" _group_name="${2}" _pkg_disabled="${3}" _pkg_finished="${4}" _pkg_name="";

	for _pkg_name in ${_pkg_disabled}; do

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

	done;

	for _pkg_name in ${_pkg_finished}; do

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

	done;

};

#

# exp_pkg_dispatch_group() - dispatch a single build group

# @_build_steps_default:	list of default build steps

# @_build_vars_default:		list of default build variables

# @_dispatch_fn:		top-level dispatch function name

# @_group_name:			build group name

# @_njobs_max:			maximum count of simultaneous jobs

# @_pipe_path:			pathname to build FIFO

# @_restart_at:			optional comma-separated list of build steps at which to rebuild or ALL

# @_restart_recursive:		optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2,) forcibly rebuild reverse dependencies (3.)

# @_workdir:			pathname to build-specific temporary directory

#

# Return:			zero (0) on success, non-zero (>0) on failure.

#

exp_pkg_dispatch_group() {

	local	_build_steps_default="${1}" _build_vars_default="${2}" _dispatch_fn="${3}"	\

		_group_name="${4}" _njobs_max="${5}" _pipe_path="${6}" _restart_at="${7}"	\

		_restart_recursive="${8}" _workdir="${9}" _pipe_msg="" _pkg_name="" _rc=0;

	rtl_fileop mkfifo "${_pipe_path}";

	while true; do

		while [ "${EXP_PKG_DISPATCH_NJOBS:-0}" -gt 0 ] && read _pipe_msg; do

		case "${_pipe_msg%% *}" in

		done)	: $((EXP_PKG_DISPATCH_NJOBS-=1)); _pkg_name="${_pipe_msg#done * }";

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

			EXP_PKG_COMPLETE="$(rtl_lconcat "${EXP_PKG_COMPLETE}" "${_pkg_name}")";

			EXP_PKG_NAMES="$(rtl_lfilter "${EXP_PKG_NAMES}" "${_pkg_name}")";

			EX_PKG_DISPATCH_WAIT="$(rtl_lfilter "${EX_PKG_DISPATCH_WAIT}" "${_pkg_name}")";

			if [ -n "${EXP_PKG_NAMES}" ] && [ "${_rc}" -eq 0 ]; then

				if [ "${EXP_PKG_DISPATCH_NJOBS}" -ne "${_njobs_max}" ]; then

					exp_pkg_dispatch_packages "${_build_steps_default}"	\

						"${_build_vars_default}" "${_dispatch_fn}"	\

						"${_group_name}" "${_njobs_max}"		\

						"${_pipe_path}" "${EXP_PKG_COMPLETE}"		\

						"${_restart_at}" "${_restart_recursive}" "${_workdir}";

				fi;

			elif [ "${EXP_PKG_DISPATCH_NJOBS:-0}" -eq 0 ]; then

				break;

			fi; ;;

		fail)	: $((EXP_PKG_DISPATCH_NJOBS-=1)); _rc=1;

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

		msg_pkg)

			"${_dispatch_fn}" msg_pkg ${_pipe_msg#msg_pkg }; ;;

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

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

		if [ -n "${EXP_PKG_NAMES}" ] && [ "${_rc}" -eq 0 ]; then

			if [ "${EXP_PKG_DISPATCH_NJOBS}" -ne "${_njobs_max}" ]; then

				exp_pkg_dispatch_packages "${_build_steps_default}"		\

					"${_build_vars_default}" "${_dispatch_fn}"		\

					"${_group_name}" "${_njobs_max}" "${_pipe_path}"	\

					"${EXP_PKG_COMPLETE}" "${_restart_at}"			\

					"${_restart_recursive}" "${_workdir}";

			fi;

		elif [ "${EXP_PKG_DISPATCH_NJOBS:-0}" -eq 0 ]; then

			break;

		fi;

	done;

	rtl_fileop rm "${_pipe_path}";

	return "${_rc}";

};

#

# exp_pkg_dispatch_package() - dispatch single named packages

# @_build_steps_default:	list of default build steps

# @_build_vars_default:		list of default build variables

# @_dispatch_fn:		top-level dispatch function name

# @_group_name:			build group name

# @_pkg_name:			single package name

# @_restart_at:			optional comma-separated list of build steps at which to rebuild or ALL

# @_workdir:			pathname to build-specific temporary directory

#

# Return:			zero (0) on success, non-zero (>0) on failure, ${EXP_PKG_DISPATCH_NJOBS}, ${EXP_PKG_DISPATCH_COUNT}, ${EXP_PKG_NAMES}, and ${EX_PKG_DISPATCH_WAIT} may be mutated post-return.

#

exp_pkg_dispatch_package() {

	local	_build_steps_default="${1}" _build_vars_default="${2}" _dispatch_fn="${3}"	\

		_group_name="${4}" _pkg_name="${5}" _restart_at="${6}" _workdir="${7}";

	if "${_dispatch_fn}" start_pkg "${_group_name}" "${_pkg_name}" "$((${EXP_PKG_DISPATCH_COUNT}+1))" "${EXP_PKG_DISPATCH_COUNT_MAX}"; then

		: $((EXP_PKG_DISPATCH_NJOBS+=1)); : $((EXP_PKG_DISPATCH_COUNT+=1)); EX_PKG_DISPATCH_WAIT="$(rtl_lconcat "${EX_PKG_DISPATCH_WAIT}" "${_pkg_name}")";

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

		if ex_pkg_env "${_build_steps_default}" "${_build_vars_default}"		\

				"${_group_name}" "${_pkg_name}" "${_restart_at}" "${_workdir}"; then

			ex_pkg_exec "${_dispatch_fn}" "${_group_name}" "${_pkg_name}" "${_restart_at}";

		else

			return 1;

		fi;) 1>"${_workdir}/${_pkg_name}_stderrout.log" 2>&1 3>"${_pipe_path}" &

	else

		return 1;

	fi;

};

#

# exp_pkg_dispatch_packages() - dispatch set of packages

# @_build_steps_default:	list of default build steps

# @_build_vars_default:		list of default build variables

# @_dispatch_fn:		top-level dispatch function name

# @_group_name:			build group name

# @_njobs_max:			maximum count of simultaneous jobs

# @_pipe_path:			pathname to parent-child process FIFO

# @_pkg_complete:		list of completed packages

# @_restart_at:			optional comma-separated list of build steps at which to rebuild or ALL

# @_restart_recursive:		optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2,) forcibly rebuild reverse dependencies (3.)

# @_workdir:			pathname to build-specific temporary directory

#

# Return:			zero (0) on success, non-zero (>0) on failure, ${EXP_PKG_DISPATCH_NJOBS}, ${EXP_PKG_DISPATCH_COUNT}, ${EXP_PKG_NAMES}, and ${EX_PKG_DISPATCH_WAIT} may be mutated post-return.

#

exp_pkg_dispatch_packages() {

	local	_build_steps_default="${1}" _build_vars_default="${2}" _dispatch_fn="${3}"		\

		_group_name="${4}" _njobs_max="${5}" _pipe_path="${6}" _pkg_complete="${7}"		\

		_restart_at="${8}" _restart_recursive="${9}" _workdir="${10}"				\

		_njob=0 _pkg_depends="" _pkg_name="";

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

		for _pkg_name in ${EXP_PKG_NAMES}; do

			if ! rtl_lmatch "${_pkg_complete}" "${_pkg_name}"\

			&& ! rtl_lmatch "${EX_PKG_DISPATCH_WAIT}" "${_pkg_name}"\

			&& ex_pkg_check_depends "${_pkg_complete}" "${_pkg_name}" "${EX_PKG_DISPATCH_WAIT}" "${_restart_recursive}"; then

				exp_pkg_dispatch_package "${_build_steps_default}"			\

					"${_build_vars_default}" "${_dispatch_fn}"			\

					"${_group_name}" "${_pkg_name}" "${_restart_at}"		\

					"${_workdir}"; break;

			fi;

		done;

	done;

};

#

# ex_pkg_dispatch() - dispatch a set of build group

# @_build_steps_default:	list of default build steps

# @_build_vars_default:		list of default build variables

# @_dispatch_fn:		top-level dispatch function name

# @_group_names:		build group name(s)

# @_groups_inhibit_deps:	inhibit group-group dependency expansion

# @_njobs_max:			maximum count of simultaneous jobs

# @_pipe_path:			pathname to build FIFO

# @_restart:			optional whitespace-separated list of package names to rebuild

# @_restart_at:			optional comma-separated list of build steps at which to rebuild or ALL

# @_restart_recursive:		optional flag specifiying either no dependency expansion (0,) dependency expansion (1,) dependency expansion and forcibly rebuild (2.)

# @_workdir:			pathname to build-specific temporary directory

#

# Return:			zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISPATCH_UNKNOWN} and ${EX_PKG_DISPATCH_WAIT} mutated post-return.

#

ex_pkg_dispatch() {

	local	_build_steps_default="${1}" _build_vars_default="${2}" _dispatch_fn="${3}"		\

		_group_names="${4}" _groups_inhibit_deps="${5}" _njobs_max="${6}" _pipe_path="${7}"	\

		_restart="${8}" _restart_at="${9}" _restart_recursive="${10}" _workdir="${11}"		\

		_pkg_name="" _pkg_names="" _rc=0							\

		EXP_PKG_COMPLETE EXP_PKG_DISABLED EXP_PKG_FINISHED EXP_PKG_DISPATCH_COUNT		\

		EXP_PKG_DISPATCH_COUNT_MAX EXP_PKG_DISPATCH_NJOBS EXP_PKG_NAMES;

	EX_PKG_DISPATCH_WAIT="";

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

		_group_names="$(rtl_uniq $(rtl_lunfold_depends '${_name}_GROUP_DEPENDS' ${_group_names}))";

	fi;

	for _group_name in ${_group_names}; do

		EXP_PKG_COMPLETE="" EXP_PKG_DISABLED="" EXP_PKG_FINISHED="";

		EXP_PKG_DISPATCH_COUNT=0 EXP_PKG_DISPATCH_COUNT_MAX=0 EXP_PKG_DISPATCH_NJOBS=0;

		EXP_PKG_NAMES="" EX_PKG_DISPATCH_WAIT="";

		if "${_dispatch_fn}" start_group "${_group_name}" ""; then

			if rtl_fileop mkdir "${_workdir}"\

			&& rtl_log_msg vnfo "Resolving \`${_group_name}' dependencies..."\

			&& ex_pkg_expand_packages "${_group_name}" "${_restart}" "${_restart_recursive}"\

			&& exp_pkg_dispatch_complete "${_dispatch_fn}" "${_group_name}" "${EXP_PKG_DISABLED}" "${EXP_PKG_FINISHED}"\

			&& rtl_log_msg vnfo "Resolved \`${_group_name}' dependencies."\

			&& EXP_PKG_DISPATCH_COUNT_MAX="$(rtl_llength "${EXP_PKG_NAMES}")"\

			&& [ "${EXP_PKG_DISPATCH_COUNT_MAX}" -gt 0 ]; then

				_pkg_names="$(rtl_lconcat "${_pkg_names}" "${EXP_PKG_NAMES}")";

				exp_pkg_dispatch_group "${_build_steps_default}"			\

					"${_build_vars_default}" "${_dispatch_fn}" "${_group_name}"	\

					"${_njobs_max}" "${_pipe_path}" "${_restart_at}"		\

					"${_restart_recursive}" "${_workdir}"; _rc="${?}";

			fi;

			"${_dispatch_fn}" finish_group "${_group_name}" "";

			if [ "${_rc}" -ne 0 ]; then

				break;

			fi;

		fi;

	done;

	if ! rtl_lmatch "${_restart}" "ALL LAST"; then

		for _pkg_name in ${_restart}; do

			if ! rtl_lmatch "${_pkg_names}" "${_pkg_name}"; then

				EX_PKG_DISPATCH_UNKNOWN="$(rtl_lconcat "${EX_PKG_DISPATCH_UNKNOWN}" "${_pkg_name}")";

			fi;

		done;

	fi;

	if [ -n "${EX_PKG_DISPATCH_UNKNOWN}" ]; then

		_rc=1;

	fi;

	return "${_rc}";

};

# vim:filetype=sh textwidth=0