#

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

#

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_llength() {

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

	for _litem in ${_list}; do

		: $((_llength+=1));

	done;

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

};

rtl_llift() {

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

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

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

};

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_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