Add support for autosave

Causes the wiki to be autosaved whenever clicking “done” after editing
a tiddler. Only works with savers that support autosave. We should
probably make autosave configurable

core/modules/savers/andtidwiki.js

@@ -16,10 +16,6 @@ var AndTidWiki = function(wiki) {
 };
 
 AndTidWiki.prototype.save = function(text,method,callback) {
-	// Bail out unless this is a save (rather than a download)
-	if(method !== "save") {
-		return false;
-	}
 	// Get the pathname of this document
 	var pathname = decodeURIComponent(document.location.toString());
 	// Strip the file://
@@ -47,7 +43,8 @@ Information about this saver
 */
 AndTidWiki.prototype.info = {
 	name: "andtidwiki",
-	priority: 1600
+	priority: 1600,
+	capabilities: ["save", "autosave"]
 };
 
 /*

core/modules/savers/download.js

@@ -46,7 +46,8 @@ Information about this saver
 */
 DownloadSaver.prototype.info = {
 	name: "download",
-	priority: 100
+	priority: 100,
+	capabilities: ["save", "download"]
 };
 
 /*

core/modules/savers/fsosaver.js

@@ -22,10 +22,6 @@ var FSOSaver = function(wiki) {
 };
 
 FSOSaver.prototype.save = function(text,method,callback) {
-	// Bail out unless this is a save (rather than a download)
-	if(method !== "save") {
-		return false;
-	}
 	// Get the pathname of this document
 	var pathname = unescape(document.location.pathname);
 	// Test for a Windows path of the form /x:\blah...
@@ -53,7 +49,8 @@ Information about this saver
 */
 FSOSaver.prototype.info = {
 	name: "FSOSaver",
-	priority: 120
+	priority: 120,
+	capabilities: ["save", "autosave"]
 };
 
 /*

core/modules/savers/manualdownload.js

@@ -33,7 +33,8 @@ Information about this saver
 */
 ManualDownloadSaver.prototype.info = {
 	name: "manualdownload",
-	priority: 0
+	priority: 0,
+	capabilities: ["save", "download"]
 };
 
 /*

core/modules/savers/msdownload.js

@@ -36,7 +36,8 @@ Information about this saver
 */
 MsDownloadSaver.prototype.info = {
 	name: "msdownload",
-	priority: 110
+	priority: 110,
+	capabilities: ["save", "download"]
 };
 
 /*

core/modules/savers/tiddlyfox.js

@@ -16,10 +16,6 @@ var TiddlyFoxSaver = function(wiki) {
 };
 
 TiddlyFoxSaver.prototype.save = function(text,method,callback) {
-	// Bail out unless this is a save (rather than a download)
-	if(method !== "save") {
-		return false;
-	}
 	var messageBox = document.getElementById("tiddlyfox-message-box");
 	if(messageBox) {
 		// Get the pathname of this document
@@ -55,7 +51,8 @@ Information about this saver
 */
 TiddlyFoxSaver.prototype.info = {
 	name: "tiddlyfox",
-	priority: 1500
+	priority: 1500,
+	capabilities: ["save", "autosave"]
 };
 
 /*

core/modules/savers/tiddlyie.js

@@ -19,11 +19,7 @@ var TiddlyIESaver = function(wiki) {
 };
 
 TiddlyIESaver.prototype.save = function(text,method,callback) {
-	// Bail out unless this is a save (rather than a download)
-	if(method !== "save") {
-		return false;
-	}
-	// check existence of TiddlyIE BHO extension (note: only works after document is complete)
+	// Check existence of TiddlyIE BHO extension (note: only works after document is complete)
 	if(typeof(window.TiddlyIE) != "undefined") {
 		// Get the pathname of this document
 		var pathname = unescape(document.location.pathname);
@@ -53,7 +49,8 @@ Information about this saver
 */
 TiddlyIESaver.prototype.info = {
 	name: "tiddlyiesaver",
-	priority: 1500
+	priority: 1500,
+	capabilities: ["save"]
 };
 
 /*

core/modules/savers/twedit.js

@@ -16,10 +16,6 @@ var TWEditSaver = function(wiki) {
 };
 
 TWEditSaver.prototype.save = function(text,method,callback) {
-	// Bail out unless this is a save (rather than a download)
-	if(method !== "save") {
-		return false;
-	}
 	// Bail if we're not running under TWEdit
 	if(typeof DeviceInfo !== "object") {
 		return false;
@@ -68,7 +64,8 @@ Information about this saver
 */
 TWEditSaver.prototype.info = {
 	name: "twedit",
-	priority: 1600
+	priority: 1600,
+	capabilities: ["save", "autosave"]
 };
 
 /*

core/modules/savers/upload.js

@@ -22,10 +22,6 @@ var UploadSaver = function(wiki) {
 };
 
 UploadSaver.prototype.save = function(text,method,callback) {
-	// Bail out unless this is a save (rather than a download)
-	if(method !== "save") {
-		return false;
-	}
 	// Get the various parameters we need
 	var backupDir = this.wiki.getTextReference("$:/UploadBackupDir") || ".",
 		username = this.wiki.getTextReference("$:/UploadName"),
@@ -78,7 +74,8 @@ Information about this saver
 */
 UploadSaver.prototype.info = {
 	name: "upload",
-	priority: 2000
+	priority: 2000,
+	capabilities: ["save", "autosave"]
 };
 
 /*

core/modules/startup.js

@@ -93,6 +93,13 @@ exports.startup = function() {
 				downloadType: "text/plain"
 			});
 		});
+		$tw.rootWidget.addEventListener("tw-auto-save-wiki",function(event) {
+			$tw.wiki.saveWiki({
+				method: "autosave",
+				template: event.param,
+				downloadType: "text/plain"
+			});
+		});
 		$tw.rootWidget.addEventListener("tw-download-file",function(event) {
 			$tw.wiki.saveWiki({
 				method: "download",

core/modules/widgets/navigator.js

@@ -289,6 +289,8 @@ NavigatorWidget.prototype.handleSaveTiddlerEvent = function(event) {
 				if(draftTitle !== this.storyTitle) {
 					this.saveStoryList(storyList);
 				}
+				// Send a notification event
+				this.dispatchEvent({type: "tw-auto-save-wiki"});
 			}
 		}
 	}

core/modules/wiki.js

@@ -904,19 +904,6 @@ exports.initSavers = function(moduleType) {
 	});
 };
 
-/*
-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. Options are:
 	method: "save" or "download"
@@ -927,15 +914,23 @@ exports.saveWiki = function(options) {
 	options = options || {};
 	var method = options.method || "save",
 		template = options.template || "$:/core/save/all",
-		downloadType = options.downloadType || "text/plain";
-	var text = this.renderTiddler(downloadType,template);
-	this.callSaver("save",text,method,function(err) {
-		if(err) {
-			alert("Error while saving:\n\n" + err);
-		} else {
-			$tw.notifier.display("$:/messages/Saved");
+		downloadType = options.downloadType || "text/plain",
+		text = this.renderTiddler(downloadType,template),
+		callback = function(err) {
+			if(err) {
+				alert("Error while saving:\n\n" + err);
+			} else {
+				$tw.notifier.display("$:/messages/Saved");
+			}
+		};
+	// Call the highest priority saver that supports this method
+	for(var t=this.savers.length-1; t>=0; t--) {
+		var saver = this.savers[t];
+		if(saver.info.capabilities.indexOf(method) !== -1 && saver.save(text,method,callback)) {
+			return true;
 		}
-	});
+	}
+	return false;
 };
 
 /*