BrowserStorage: A new plugin to save tiddlers to local storage

Experimental at this point.

plugins/tiddlywiki/browser-storage/startup.js

@@ -0,0 +1,41 @@
+/*\
+title: $:/plugins/tiddlywiki/browser-storage/startup.js
+type: application/javascript
+module-type: startup
+
+Startup initialisation
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+// Export name and synchronous status
+exports.name = "browser-storage";
+exports.platforms = ["browser"];
+exports.after = ["load-modules"];
+exports.synchronous = true;
+
+exports.startup = function() {
+	// Compute our prefix for local storage keys
+	var url = window.location.protocol === "file:" ? window.location.pathname : "",
+		prefix = "tw5#" + url + "#"
+	// Track tiddler changes
+	$tw.wiki.addEventListener("change",function(changes) {
+		$tw.utils.each(changes,function(change,title) {
+			var tiddler = $tw.wiki.getTiddler(title);
+			if(tiddler) {
+				var json = JSON.stringify(tiddler.getFieldStrings());
+				window.localStorage.setItem(prefix + title,json);
+				console.log("browser-storage: Saving",title);
+			} else {
+				window.localStorage.removeItem(prefix + title);
+				console.log("browser-storage: Deleting",title);
+			}
+		});
+	});
+};
+
+})();