Add new "variables" and "getvariables" operators

core/modules/filters/getvariable.js

@@ -0,0 +1,26 @@
+/*\
+title: $:/core/modules/filters/getvariable.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for replacing input values by the value of the variable with the same name, or blank if the variable is missing
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.getvariable = function(source,operator,options) {
+	var results = [];
+	source(function(tiddler,title) {
+		results.push(options.widget.getVariable(title) || "");
+	});
+	return results;
+};
+
+})();

core/modules/filters/variables.js

@@ -0,0 +1,26 @@
+/*\
+title: $:/core/modules/filters/variables.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for returning the names of the active variables
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.variables = function(source,operator,options) {
+	var names = [];
+	for(var variable in options.widget.variables) {
+		names.push(variable);
+	}
+	return names.sort();
+};
+
+})();