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#
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# set +o errexit -o noglob is assumed.
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#
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rtl_lconcat() {
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	local _list="${1}" _litem_new="${2}" _sep="${3:- }" IFS="${3:-${IFS}}";
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	if [ -n "${_list}" ]; then
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		printf "%s%s%s" "${_list}" "${_sep}" "${_litem_new}";
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	else
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		printf "%s" "${_litem_new}";
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	fi;
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};
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rtl_lfilter() {
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	local	_list="${1}" _filter="${2}" _sep="${3:- }" IFS="${3:-${IFS}}"	\
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		_filterfl="" _litem="" _litem_filter="" _lnew="";
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	if [ -z "${_filter}" ]; then
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		echo "${_list}"; return 0;
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	else for _litem in ${_list}; do
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		_filterfl=0;
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		for _litem_filter in ${_filter}; do
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			if [ "${_litem_filter}" = "${_litem}" ]; then
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				_filterfl=1; break;
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			fi;
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		done;
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		if [ "${_filterfl:-0}" -eq 0 ]; then
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			_lnew="${_lnew:+${_lnew}${_sep}}${_litem}";
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		fi;
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	done; fi;
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	echo "${_lnew}";
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};
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rtl_llength() {
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	local _list="${1}" _sep="${2:- }" IFS="${2:-${IFS}}" _litem="" _llength=0;
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	for _litem in ${_list}; do
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		: $((_llength+=1));
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	done;
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	echo "${_llength}";
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};
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rtl_llift() {
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	local _list="${1}" _sep="${2}" _sep_new="${3}" IFS; IFS="${_sep}";
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	set -- ${_list}; IFS="${_sep_new}";
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	echo "${*}";
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};
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rtl_lmatch() {
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	local _list="${1}" _item="${2}" _sep="${3}";
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	[ -n "$(rtl_lsearch "${_list}" "${_item}" "${_sep}")" ];
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};
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rtl_lsearch() {
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	local	_list="${1}" _filter="${2}" _sep="${3:- }" IFS="${3:-${IFS}}"	\
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		_litem="" _litem_filter="" _lnew="";
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	if [ -z "${_filter}" ]; then
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		echo "${_list}"; return 0;
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	else for _litem in ${_list}; do
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		for _litem_filter in ${_filter}; do
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			if [ "${_litem_filter}" = "${_litem}" ]; then
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				_lnew="${_lnew:+${_lnew}${_sep}}${_litem}";
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				break;
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			fi;
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		done;
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	done; fi;
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	echo "${_lnew}";
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};
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rtl_lunfold_depends() {
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	local _vname_template="${1}" _depends="" _name="" _names=""; shift;
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	for _name in "${@}"; do
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		if _depends="$(rtl_get_var_unsafe -u "$(eval printf \"%s\" \""${_vname_template}"\")")"\
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		&& [ -n "${_depends}" ]; then
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			_depends="$(rtl_lunfold_depends "${_vname_template}" ${_depends})";
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			_names="$(rtl_lconcat "${_names}" "${_depends}")";
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		fi;
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		_names="$(rtl_lconcat "${_names}" "${_name}")";
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	done;
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	echo "${_names}";
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};
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# vim:filetype=sh