#

# set +o errexit -o noglob -o nounset 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_expand_packages() - expand build group name to list of packages ordered and filtered according to dependency and restart constraints

# @_checkfl:		enable (1) or inhibit (0) dependency expansion

# @_forcefl:		enable (1) or inhibit (0) forcibly rebuilding finished packages

# @_group_name:		build group name

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

# @_reversefl:		unfold reverse dependencies (1) or dependencies (0)

#

# Return:		zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISABLED}, ${EX_PKG_FINISHED}, and ${EX_PKG_NAMES} set post-return.

#

exp_pkg_dispatch_expand_packages() {

	local	_checkfl="${1}" _forcefl="${2}" _group_name="${3}" _restart="${4}" _reversefl="${5}"\

		_pkg_names=""; EX_PKG_DISABLED=""; EX_PKG_FINISHED=""; EX_PKG_NAMES="";

	if _pkg_names="$(rtl_get_var_unsafe -u "${_group_name}_PACKAGES")"\

	&& [ -n "${_pkg_names}" ]; then

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

			ex_pkg_unfold_depends "${_checkfl}" "${_forcefl}" "${_group_name}" "${_pkg_names}" "${_restart}" 1;

		else	ex_pkg_unfold_rdepends "${_group_name}" "${_pkg_names}" "${_restart}" 1;

		fi;

	fi;

	return 0;

};

#

# 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

# @_checkfl:			enable (1) or inhibit (0) dependency expansion

# @_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

# @_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}" _checkfl="${3}"		\

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

		_restart_at="${8}" _workdir="${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)	_pkg_name="${_pipe_msg#done * }"; : $((EXP_PKG_DISPATCH_NJOBS-=1));

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

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

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

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

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

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

					exp_pkg_dispatch_packages "${_build_steps_default}"	\

						"${_build_vars_default}" "${_checkfl}"		\

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

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

						"${EX_PKG_DISABLED}" "${EX_PKG_FINISHED}"	\

						"${_restart_at}" "${_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 "${EX_PKG_NAMES}" ] && [ "${_rc}" -eq 0 ]; then

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

				exp_pkg_dispatch_packages "${_build_steps_default}"		\

					"${_build_vars_default}" "${_checkfl}"			\

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

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

					"${EX_PKG_DISABLED}" "${EX_PKG_FINISHED}"		\

					"${_restart_at}" "${_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}, ${EX_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}")";

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

			printf \"done %s %s\n\" \"${_group_name}\" \"${_pkg_name}\" >&3;	\

		      else									\

			printf \"fail %s %s\n\" \"${_group_name}\" \"${_pkg_name}\" >&3;	\

			pkill -U "${$}";							\

		      fi;" EXIT HUP INT TERM USR1 USR2;

		set +o errexit -o noglob -o nounset; BUILD_IS_PARENT=0; rtl_log_set_fname ""; rtl_log_set_no_attr 1;

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

				"${_group_name}" 0 "${_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

# @_checkfl:			enable (1) or inhibit (0) dependency expansion

# @_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_disabled:		list of disabled packages

# @_pkg_finished:		list of finished packages

# @_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}, ${EX_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}" _checkfl="${3}"		\

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

		_pkg_disabled="${8}" _pkg_finished="${9}" _restart_at="${10}" _workdir="${11}"	\

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

	while [ "${EXP_PKG_DISPATCH_NJOBS:-0}" -lt "${_njobs_max}" ]; do

		_foundfl=0;

		for _pkg_name in ${EX_PKG_NAMES}; do

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

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

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

			&& ex_pkg_check_depends "${_checkfl}" "${_pkg_disabled}" "${_pkg_finished}"	\

					"${_pkg_name}" "${EX_PKG_DISPATCH_WAIT}"; then

				exp_pkg_dispatch_package "${_build_steps_default}"			\

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

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

					"${_workdir}"; _foundfl=1; break;

			fi;

		done;

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

			break;

		fi;

	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,) forcibly rebuild reverse dependencies (3.)

# @_workdir:			pathname to build-specific temporary directory

#

# Return:			zero (0) on success, non-zero (>0) on failure, ${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}"		\

		_checkfl=1 _forcefl=0 _pkg_name="" _pkg_names="" _rc=0 _reversefl=0			\

		EX_PKG_DISABLED EX_PKG_FINISHED EX_PKG_NAMES EXP_PKG_DISPATCH_COUNT			\

		EXP_PKG_DISPATCH_COUNT_MAX EXP_PKG_DISPATCH_NJOBS; EX_PKG_DISPATCH_WAIT="";

	case "${_groups_inhibit_deps:-0}" in

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

	esac;

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

		case "${_restart_recursive:-0}" in

		0)	_checkfl=0; _forcefl=0; _reversefl=0; ;;

		1)	_checkfl=1; _forcefl=0; _reversefl=0; ;;

		2)	_checkfl=1; _forcefl=1; _reversefl=0; ;;

		3)	_checkfl=1; _forcefl=1; _reversefl=1; ;;

		esac;

	fi;

	for _group_name in ${_group_names}; do

		EX_PKG_DISABLED=""; EX_PKG_DISPATCH_WAIT=""; EX_PKG_FINISHED=""; EX_PKG_NAMES="";

		EXP_PKG_DISPATCH_COUNT=0; EXP_PKG_DISPATCH_COUNT_MAX=0; EXP_PKG_DISPATCH_NJOBS=0;

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

			if rtl_fileop mkdir "${_workdir}"\

			&& rtl_log_msg notice "Resolving \`%s' dependencies..." "${_group_name}"\

			&& exp_pkg_dispatch_expand_packages "${_checkfl}" "${_forcefl}" "${_group_name}" "${_restart}" "${_reversefl}"\

			&& exp_pkg_dispatch_complete "${_dispatch_fn}" "${_group_name}" "${EX_PKG_DISABLED}" "${EX_PKG_FINISHED}"\

			&& rtl_log_msg notice "Resolved \`%s' dependencies." "${_group_name}"\

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

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

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

				exp_pkg_dispatch_group "${_build_steps_default}"			\

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

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

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

			fi;

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

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

				break;

			fi;

		fi;

	done; return "${_rc}";

};

# vim:filetype=sh textwidth=0