Add a new version of rendertiddlers command

So that we can test static html generation

core/modules/commands/new_rendertiddlers.js

@@ -0,0 +1,66 @@
+/*\
+title: $:/core/modules/commands/new_rendertiddlers.js
+type: application/javascript
+module-type: command
+
+Command to render several tiddlers to a folder of files
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var widget = require("$:/core/modules/new_widgets/widget.js");
+
+exports.info = {
+	name: "new_rendertiddlers",
+	synchronous: true
+};
+
+var Command = function(params,commander,callback) {
+	this.params = params;
+	this.commander = commander;
+	this.callback = callback;
+};
+
+Command.prototype.execute = function() {
+	if(this.params.length < 2) {
+		return "Missing filename";
+	}
+	var self = this,
+		fs = require("fs"),
+		path = require("path"),
+		wiki = this.commander.wiki,
+		filter = this.params[0],
+		template = this.params[1],
+		pathname = this.params[2],
+		type = this.params[3] || "text/html",
+		extension = this.params[4] || ".html",
+		tiddlers = wiki.filterTiddlers(filter);
+	$tw.utils.each(tiddlers,function(title) {
+		var parser = wiki.new_parseTiddler(template),
+			parseTreeNode = parser ? {type: "widget", children: [{
+				type: "setvariable",
+				attributes: {
+					name: {type: "string", value: "tiddlerTitle"},
+					value: {type: "string", value: title}
+				},
+				children: parser.tree
+			}]} : undefined,
+			widgetNode = new widget.widget(parseTreeNode,{
+				wiki: wiki,
+				document: $tw.document
+			});
+		var container = $tw.document.createElement("div");
+		widgetNode.render(container,null);
+		var text = type === "text/html" ? container.innerHTML : container.textContent;
+		fs.writeFileSync(path.resolve(pathname,encodeURIComponent(title) + extension),text,"utf8");
+	});
+	return null;
+};
+
+exports.Command = Command;
+
+})();