Added a saver for the TWEdit iPad/iPhone app

core/modules/savers/twedit.js

@@ -0,0 +1,90 @@
+/*\
+title: $:/core/modules/savers/twedit.js
+type: application/javascript
+module-type: saver
+
+Handles saving changes via the TWEdit iOS app
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false, netscape: false, Components: false */
+"use strict";
+
+var TWEditSaver = function(wiki) {
+};
+
+TWEditSaver.prototype.save = function(text,callback) {
+	// Bail if we're not running under TWEdit
+	if(typeof DeviceInfo !== "object") {
+		return false;
+	}
+	// Get the pathname of this document
+	var pathname = decodeURIComponent(document.location.pathname);
+	// Strip any query or location part
+	var p = pathname.indexOf("?");
+	if(p !== -1) {
+		pathname = pathname.substr(0,p);
+	}
+	p = pathname.indexOf("#");
+	if(p !== -1) {
+		pathname = pathname.substr(0,p);
+	}
+	// Remove the leading "/Documents" from path
+	var prefix = "/Documents";
+	if(pathname.indexOf(prefix) === 0) {
+		pathname = pathname.substr(prefix.length);
+	}
+	// Error handler
+	var errorHandler = function(event) {
+    	// Error
+    	callback("Error saving to TWEdit: " + event.target.error.code);
+    };
+	// Get the file system
+    window.requestFileSystem(LocalFileSystem.PERSISTENT,0,function(fileSystem) {
+    	// Now we've got the filesystem, get the fileEntry
+        fileSystem.root.getFile(pathname, {create: true}, function(fileEntry) {
+        	// Now we've got the fileEntry, create the writer
+        	fileEntry.createWriter(function(writer) {
+		        writer.onerror = errorHandler;
+		        writer.onwrite = function() {
+		        	callback(null);
+		        };
+		        writer.position = 0;
+		        writer.write(text);
+        	},errorHandler);
+        }, errorHandler);
+    }, errorHandler);
+    return true;
+};
+
+/*
+Information about this saver
+*/
+TWEditSaver.prototype.info = {
+	name: "twedit",
+	priority: 1600
+};
+
+/*
+Static method that returns true if this saver is capable of working
+*/
+exports.canSave = function(wiki) {
+	return true;
+};
+
+/*
+Create an instance of this saver
+*/
+exports.create = function(wiki) {
+	return new TWEditSaver(wiki);
+};
+
+/////////////////////////// Hack
+// HACK: This ensures that TWEdit recognises us as a TiddlyWiki document
+if($tw.browser) {
+	window.version = {title: "TiddlyWiki"};
+}
+
+})();