1 files changed, 75 insertions, 0 deletions
diff --git a/subr/rtl_list.subr b/subr/rtl_list.subr
new file mode 100644
index 00000000..056d8016
--- /dev/null
+++ b/subr/rtl_list.subr
@@ -0,0 +1,75 @@
+#
+# set +o errexit -o noglob 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
+		echo "${_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;
+	echo "${_lnew}";
+};
+
+rtl_llength() {
+	local _list="${1}" _sep="${2:- }" IFS="${2:-${IFS}}" _litem="" _llength=0;
+	for _litem in ${_list}; do
+		: $((_llength+=1));
+	done;
+	echo "${_llength}";
+};
+
+rtl_lmatch() {
+	local _list="${1}" _item="${2}" _sep="${3}";
+	[ -n "$(rtl_lsearch "${_list}" "${_item}" "${_sep}")" ];
+};
+
+rtl_lsearch() {
+	local	_list="${1}" _filter="${2}" _sep="${3:- }" IFS="${3:-${IFS}}"	\
+		_litem="" _litem_filter="" _lnew="";
+	if [ -z "${_filter}" ]; then
+		echo "${_list}"; return 0;
+	else for _litem in ${_list}; do
+		for _litem_filter in ${_filter}; do
+			if [ "${_litem_filter}" = "${_litem}" ]; then
+				_lnew="${_lnew:+${_lnew}${_sep}}${_litem}";
+				break;
+			fi;
+		done;
+	done; fi;
+	echo "${_lnew}";
+};
+
+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}" "${_name}")";
+	done;
+	echo "${_names}";
+};
+
+# vim:filetype=sh