Added primitive save changes mechanism

Works in Firefox for now

core/modules/savers/download.js

@@ -0,0 +1,46 @@
+/*\
+title: $:/core/modules/savers/download.js
+type: application/javascript
+module-type: saver
+
+Handles saving changes via HTML5's download APIs
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Select the appropriate saver module and set it up
+*/
+var DownloadSaver = function() {
+};
+
+DownloadSaver.prototype.save = function() {
+};
+
+/*
+Information about this saver
+*/
+DownloadSaver.prototype.info = {
+	name: "download",
+	priority: 0
+};
+
+/*
+Static method that returns true if this saver is capable of working
+*/
+exports.canSave = function() {
+	return true;
+};
+
+/*
+Create an instance of this saver
+*/
+exports.create = function() {
+	return new DownloadSaver();
+};
+
+})();

core/modules/savers/firefox.js

@@ -0,0 +1,67 @@
+/*\
+title: $:/core/modules/savers/firefox.js
+type: application/javascript
+module-type: saver
+
+Handles saving changes via Firefox's XUL APIs
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var FirefoxSaver = function() {
+};
+
+FirefoxSaver.prototype.save = function(text) {
+	try {
+		netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+		// Generate the local file path from the file URI
+		var url = document.location.toString(),
+			ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService),
+			fileHandler = ioService.getProtocolHandler("file").QueryInterface(Components.interfaces.nsIFileProtocolHandler),
+			fileSpec = fileHandler.getFileFromURLSpec(url);
+console.log("Saving to",fileSpec.path);
+		// Try to save the file
+		var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
+		file.initWithPath(fileSpec.path);
+		if(!file.exists()) {
+			file.create(0,0x01B4);// 0x01B4 = 0664
+		}
+		var out = Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);
+		out.init(file,0x22,0x04,null);
+		var converter = Components.classes["@mozilla.org/intl/converter-output-stream;1"].createInstance(Components.interfaces.nsIConverterOutputStream);
+		converter.init(out, "UTF-8", 0, 0);
+		converter.writeString(text);
+		converter.close();
+		return true;
+	} catch(ex) {
+		return false;
+	}
+};
+
+/*
+Information about this saver
+*/
+FirefoxSaver.prototype.info = {
+	name: "firefox",
+	priority: 1000
+};
+
+/*
+Static method that returns true if this saver is capable of working
+*/
+exports.canSave = function() {
+	return !!window.Components;
+};
+
+/*
+Create an instance of this saver
+*/
+exports.create = function() {
+	return new FirefoxSaver();
+};
+
+})();

core/modules/startup.js

@@ -63,6 +63,14 @@ exports.startup = function() {
 		});
 		// Install the scroller
 		$tw.scroller = new $tw.utils.Scroller();
+		// Install the save action handler
+		$tw.wiki.initSavers();
+		document.addEventListener("tw-save-wiki",function(event) {
+			$tw.wiki.saveWiki({
+				template: "$:/core/templates/tiddlywiki5.template.html",
+				downloadType: "text/plain"
+			});
+		},false);
 		// Get the default tiddlers
 		var defaultTiddlersTitle = "$:/DefaultTiddlers",
 			defaultTiddlersTiddler = $tw.wiki.getTiddler(defaultTiddlersTitle),

core/modules/wiki.js

@@ -478,4 +478,57 @@ exports.initStoryViews = function(moduleType) {
 	}
 };
 
+/*
+Select the appropriate saver modules and set them up
+*/
+exports.initSavers = function(moduleType) {
+	moduleType = moduleType || "saver";
+	// Instantiate the available savers
+	this.savers = [];
+	for(var t=0; t<$tw.plugins.moduleTypes[moduleType].length; t++) {
+		var saver = $tw.plugins.moduleTypes[moduleType][t];
+		if(saver.canSave()) {
+			this.savers.push(saver.create());
+		}
+	}
+	// Sort the savers into priority order
+	this.savers.sort(function(a,b) {
+		if(a.info.priority < b.info.priority) {
+			return -1;
+		} else {
+			if(a.info.priority > b.info.priority) {
+				return +1;
+			} else {
+				return 0;
+			}
+		}
+	});
+};
+
+/*
+Invoke the highest priority saver that successfully handles a method
+*/
+exports.callSaver = function(method /*, args */ ) {
+	for(var t=this.savers.length-1; t>=0; t--) {
+		var saver = this.savers[t];
+		if(saver[method].apply(saver,Array.prototype.slice.call(arguments,1))) {
+			return true;
+		}
+	}
+	return false;
+};
+
+/*
+Save the wiki contents
+	template: the tiddler containing the template to save
+	downloadType: the content type for the saved file
+*/
+exports.saveWiki = function(options) {
+	options = options || {};
+	var template = options.template || "$:/core/templates/tiddlywiki5.template.html",
+		downloadType = options.downloadType || "text/plain",
+		text = this.renderTiddler(downloadType,template);
+	this.callSaver("save",text);
+};
+
 })();

core/templates/PageTemplate.tid

@@ -22,6 +22,9 @@ title: $:/templates/PageTemplate
 <<button popup:ViewDropDownState><View <span class="caret"></span>>>
 }}}
 
+
+<<button save-wiki class:"btn"><Save Changes>>
+
 }}}
 
 <<linkcatcher store:[[$:/CurrentView]]><