Added a download macro

This enables us to save changes by cooking a new tiddlywiki and forcing
a download of it

core/modules/macros/download.js

@@ -0,0 +1,52 @@
+/*\
+title: $:/core/modules/macros/download.js
+type: application/javascript
+module-type: macro
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+exports.info = {
+	name: "download",
+	params: {
+		title: {byName: "default", type: "text"},
+		type: {byName: true, type: "text"},
+		"filename": {byName: true, type: "text"},
+		"label": {byName: true, type: "text"}
+	},
+	events: ["click"]
+};
+
+exports.handleEvent = function(event) {
+	switch(event.type) {
+		case "click":
+			var text = this.wiki.renderTiddler(this.downloadType,this.downloadTitle),
+				link = document.createElement("a");
+			link.setAttribute("download",this.downloadFilename);
+			link.setAttribute("href","data:" + this.downloadType + "," + encodeURIComponent(text));
+			link.click();
+			event.preventDefault();
+			return false;
+	}
+	return true;
+};
+
+exports.executeMacro = function() {
+	this.downloadTitle = this.params.title || "$:/core/tiddlywiki5.template.html";
+	this.downloadType = this.params.type || "text/plain";
+	this.downloadFilename = this.params.filename || this.downloadTitle;
+	var attributes = {},
+		content = [];
+	if(this.hasParameter("label")) {
+		content.push($tw.Tree.Text(this.params.label));
+	} else {
+		content.push($tw.Tree.Text("Download \"" + this.downloadFilename + "\""));
+	}
+	return [$tw.Tree.Element("button",attributes,content)];
+};
+
+})();

tw5.com/tiddlers/Introduction.tid

@@ -2,7 +2,10 @@ title: Introduction
 
 TiddlyWiki5 gains new capabilities through a [[completely rebuilt architecture|TiddlyWikiArchitecture]] using the latest features of HTML5 and node.js. It runs natively under node.js, and can also use its own components to construct a version of itself that works entirely within the browser, just as TiddlyWiki has always done.
 
-TiddlyWiki5 also functions as the build system for earlier versions of TiddlyWiki, replacing the elderly Cook and Ginsu tools (see https://github.com/TiddlyWiki/cooker for details). See the CommandLineInterface for details.
+You can modify this wiki, and then download a copy by clicking this button:
+<<download filename:"TiddlyWiki.html" label:"Save Changes">>
+
+You can download a static copy of the tiddlers that are currently displayed in this wiki by clicking this button: <<download title:"$:/core/static.template.html" filename:"Story.html" label:"Static Wiki">>
 
 {{alert alert-error{
 Try out the prototype touch features:
@@ -14,7 +17,6 @@ Learning more about TiddlyWiki5:
 * Some very rough UserInterfaceSketches showing where it is heading
 
 Some useful tiddlers for feature testing:
-* ClockTiddler showing automatic refreshing of tiddlers
 * ImageTests showing different ways of embedding images
 * SampleData showing how JSON tiddlers are handled
 * SampleJavaScript and SampleJavaScriptWithError showing how JavaScript code is displayed