#

# set +o errexit -o noglob -o nounset is assumed.

# N.B.	Lists separated by SP, when passed to rtl_l*() w/ explicit IFS,

#	must specify "<SP><VT>" as IFS.

#

rtl_lassign() {

	local	_vnames="${1}" _sep="${2}" _vname="" _vval=""\

		IFS RTL_LFIRST_HEAD="" RTL_LFIRST_TAIL="";

	IFS="${_sep}"; shift 2;

	for _vval in ${@}; do

		if ! rtl_lfirst "${_vnames}" " "; then

			return 1;

		else

			_vname="${RTL_LFIRST_HEAD}"; _vnames="${RTL_LFIRST_TAIL}";

			rtl_set_var_unsafe "${_vname}" "${_vval}";

		fi;

	done;

};

rtl_lconcat() {

	local _list="${1}" _litem_new="${2}" _sep="${3:- }" IFS="${3:-${IFS:- }}";

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

		printf "%s%s%s" "${_list}" "${_sep}" "${_litem_new}";

	else

		printf "%s" "${_litem_new}";

	fi;

};

rtl_lfilter() {

	local	_list="${1}" _filter="${2}" _sep="${3:- }" IFS="${3:-${IFS:- }}"\

		_filterfl="" _litem="" _litem_filter="" _lnew="";

	if [ -z "${_filter}" ]; then

		printf "%s" "${_list}"; return 0;

	else for _litem in ${_list}; do

		_filterfl=0;

		for _litem_filter in ${_filter}; do

			if [ "${_litem_filter}" = "${_litem}" ]; then

				_filterfl=1; break;

			fi;

		done;

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

			_lnew="${_lnew:+${_lnew}${_sep}}${_litem}";

		fi;

	done; fi;

	printf "%s" "${_lnew}";

};

rtl_lfilter2() {

	local	_rlist="${1#\$}" _rlist_new="${2#\$}" _filter="${3}" _sep="${4:- }" IFS="${4:-${IFS:- }}"\

		_filterfl="" _litem="" _litem_filter="" _lnew="";

	if [ "${_filter:+1}" != 1 ]; then

		eval ${_rlist_new}=; return 0;

	else	eval set -- '${'"${_rlist}"'}'\; ${_rlist_new}=;

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

			_litem="${1}"; shift; _filterfl=0;

			for _litem_filter in ${_filter}; do

				if [ "${_litem_filter}" = "${_litem}" ]; then

					_filterfl=1; break;

				fi;

			done;

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

				eval ${_rlist_new}='${'"${_rlist_new}"':+${'"${_rlist_new}"'}${_sep}}${_litem}';

			fi;

		done;

	fi;

};

rtl_lfilter3() {

	rtl_lfilter2 "${1}" "${1}" "${2}" "${3:-}";

};

rtl_lfirst() {

	local _list="${1}" _sep="${2}" IFS; IFS="${_sep}";

	set -- ${_list}; RTL_LFIRST_HEAD="${1}";

	if [ "${#}" -ge 0 ]; then

		shift; RTL_LFIRST_TAIL="${*}";

	else

		RTL_LFIRST_TAIL="";

	fi;

};

rtl_llength() {

	local _list="${1}" _sep="${2:- }" IFS="${2:-${IFS:- }}" _litem="" _llength=0;

	for _litem in ${_list}; do

		: $((_llength+=1));

	done;

	printf "%s" "${_llength}";

};

rtl_llength2() {

	local _rlist="${1#\$}" _rlen="${2#\$}" _sep="${3:- }" IFS="${3:-${IFS:- }}";

	eval set -- '${'"${_rlist}"'}'\; ${_rlen}='${#}';

};

rtl_llift() {

	local _list="${1}" _sep="${2}" _sep_new="${3}" IFS; IFS="${_sep}";

	set -- ${_list}; IFS="${_sep_new}";

	printf "%s" "${*}";

};

rtl_llift2() {

	local	_rlist="${1#\$}" _rlist_new="${2#\$}" _sep="${3}"	\

		_sep_new="${4}" IFS; IFS="${_sep}";

	eval set -- '${'"${_rlist}"'}'; IFS="${_sep_new}";

	eval ${_rlist_new}='"${*}"';

};

rtl_llift3() {

	rtl_llift2 "${1}" "${1}" "${2}" "${3}";

};

rtl_lmatch() {

	local _list="${1}" _item="${2}" _sep="${3:- }";

	[ -n "$(rtl_lsearch "${_list}" "${_item}" "${_sep}")" ];

};

rtl_lmax() {

	local _len=0 _len_max=0;

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

		_len="${#1}";

		if [ "${_len}" -gt "${_len_max}" ]; then

			_len_max="${_len}";

		fi; shift;

	done; printf "%s" "${_len_max}";

};

rtl_lsearch() {

	local	_list="${1}" _filter="${2}" _sep="${3:- }" IFS="${3:-${IFS:- }}"\

		_litem="" _litem_filter="" _lnew="";

	if [ -z "${_filter}" ]; then

		printf "%s" "${_list}"; return 0;

	else for _litem in ${_list}; do

		for _litem_filter in ${_filter}; do

			if [ "${_litem_filter}" = "${_litem}" ]; then

				_lnew="${_lnew:+${_lnew}${_sep}}${_litem}";

				break;

			fi;

		done;

	done; fi;

	printf "%s" "${_lnew}";

};

rtl_lsearch_patternl() {

	local	_list="${1}" _pattern="${2}" _sep="${3:- }" IFS="${3:-${IFS:- }}"\

		_litem="" _lnew="";

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

		for _litem in ${_list}; do

			if [ "${_litem#${_pattern}}" != "${_litem}" ]; then

				_lnew="${_lnew:+${_lnew}${_sep}}${_litem}";

			fi;

		done;

	fi;

	printf "%s" "${_lnew}";

};

rtl_lsort() {

	local _list="${1}" _sep="${2:- }";

	printf "%s" "${_list}" | tr "${_sep}" "\n" | sort | paste -s -d "${_sep}";

};

rtl_lunfold_depends() {

	local _vname_template="${1}" _depends="" _name="" _names=""; shift;

	for _name in "${@}"; do

		if _depends="$(rtl_get_var_unsafe -u "$(eval printf \"%s\" \""${_vname_template}"\")")"\

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

			_depends="$(rtl_lunfold_depends "${_vname_template}" ${_depends})";

			_names="$(rtl_lconcat "${_names}" "${_depends}")";

		fi;

		_names="$(rtl_lconcat "${_names}" "${_name}")";

	done;

	printf "%s" "${_names}";

};

# vim:filetype=sh