Add experimental system tiddler browser

core/modules/filters/splitbefore.js

@@ -0,0 +1,31 @@
+/*\
+title: $:/core/modules/filters/splitbefore.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator that splits each result on the first occurance of the specified separator and returns the unique values.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.splitbefore = function(source,operator,options) {
+	var results = [];
+	source(function(tiddler,title) {
+		var parts = title.split(operator.operand);
+		if(parts.length === 1) {
+			$tw.utils.pushTop(results,parts[0]);
+		} else {
+			$tw.utils.pushTop(results,parts[0] + operator.operand);
+		}
+	});
+	return results;
+};
+
+})();