From 2b85d0a1de9ec57aab6293163d9885d76a47035c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lucio=20Andr=C3=A9s=20Illanes=20Albornoz?=
 <lucio@lucioillanes.de>
Date: Tue, 25 Feb 2020 17:26:03 +0000
Subject: General cleanup, pt. I.

---
 subr/ex_rtl_list.subr | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 subr/ex_rtl_list.subr

(limited to 'subr/ex_rtl_list.subr')

diff --git a/subr/ex_rtl_list.subr b/subr/ex_rtl_list.subr
new file mode 100644
index 00000000..45a641c6
--- /dev/null
+++ b/subr/ex_rtl_list.subr
@@ -0,0 +1,62 @@
+#
+# set +o errexit -o noglob is assumed.
+#
+
+ex_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;
+};
+
+ex_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 "${_lnew}";
+};
+
+ex_rtl_llength() {
+	local _list="${1}" _sep="${2:- }" IFS="${2:-${IFS}}" _litem="" _llength=0;
+	for _litem in ${_list}; do
+		: $((_llength+=1));
+	done;
+	echo "${_llength}";
+};
+
+ex_rtl_lmatch() {
+	local _list="${1}" _item="${2}" _sep="${3}";
+	[ -n "$(ex_rtl_lsearch "${_list}" "${_item}" "${_sep}")" ];
+};
+
+ex_rtl_lsearch() {
+	local	_list="${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}";
+};
+
+# vim:filetype=sh
-- 
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