Modify behavior on Zotero Standalone launch to account for failure

- Close Zotero pane before database is closed prior to reload, instead
  of waiting until reload is complete
- Show an error message if Zotero Standalone is not accessible when it
  should be

chrome/content/zotero/overlay.js

@@ -146,14 +146,19 @@ var ZoteroOverlay = new function()
 		// Hide browser chrome on Zotero tab
 		XULBrowserWindow.inContentWhitelist.push("chrome://zotero/content/tab.xul");
 		
-		// Close pane if connector is enabled
-		ZoteroPane_Local.addReloadListener(function() {
-			if(Zotero.isConnector) {
+		// Close pane before reload
+		ZoteroPane_Local.addBeforeReloadListener(function(newMode) {
+			if(newMode == "connector") {
 				// save current state
 				_stateBeforeReload = !zoteroPane.hidden && !zoteroPane.collapsed;
 				// ensure pane is closed
 				if(!zoteroPane.collapsed) ZoteroOverlay.toggleDisplay(false, true);
-			} else {
+			}
+		});
+
+		// Close pane if connector is enabled
+		ZoteroPane_Local.addReloadListener(function() {
+			if(!Zotero.isConnector) {
 				// reopen pane if it was open before
 				ZoteroOverlay.toggleDisplay(_stateBeforeReload, true);
 			}

chrome/content/zotero/xpcom/zotero.js

@@ -472,6 +472,9 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 		if(Zotero.isConnector) {
 			Zotero.debug("Loading in connector mode");
 			Zotero.Connector_Types.init();
+
+			// Store a startupError until we get information from Zotero Standalone
+			Zotero.startupError = Zotero.getString("connector.loadInProgress")
 			
 			if(!Zotero.isFirstLoadThisSession) {
 				// We want to get a checkInitComplete message before initializing if we switched to
@@ -496,6 +499,7 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 	this.initComplete = function() {
 		if(Zotero.initialized) return;
 		this.initialized = true;
+		delete this.startupError;
 		
 		if(Zotero.isConnector) {
 			Zotero.Repo.init();

chrome/content/zotero/zoteroPane.js

@@ -91,7 +91,7 @@ var ZoteroPane = new function()
 	var self = this,
 		_loaded = false, _madeVisible = false,
 		titlebarcolorState, titleState, observerService,
-		_reloadFunctions = [];
+		_reloadFunctions = [], _beforeReloadFunctions = [];
 	
 	/**
 	 * Called when the window containing Zotero pane is open
@@ -128,6 +128,13 @@ var ZoteroPane = new function()
 		observerService = Components.classes["@mozilla.org/observer-service;1"]
 					  .getService(Components.interfaces.nsIObserverService);
 		observerService.addObserver(_reloadObserver, "zotero-reloaded", false);
+		observerService.addObserver(_reloadObserver, "zotero-before-reload", false);
+		this.addBeforeReloadListener(function(newMode) {
+			if(newMode == "connector") {
+				ZoteroPane_Local.setItemsPaneMessage(Zotero.getString('connector.standaloneOpen'));
+			}
+			return;
+		});
 		this.addReloadListener(_loadPane);
 		
 		// continue loading pane
@@ -141,10 +148,7 @@ var ZoteroPane = new function()
 	function _loadPane() {
 		if(!Zotero || !Zotero.initialized) return;
 		
-		if(Zotero.isConnector) {
-			ZoteroPane_Local.setItemsPaneMessage(Zotero.getString('connector.standaloneOpen'));
-			return;
-		} else {
+		if(!Zotero.isConnector) {
 			ZoteroPane_Local.clearItemsPaneMessage();
 		}
 		
@@ -4106,6 +4110,14 @@ var ZoteroPane = new function()
 		if(_reloadFunctions.indexOf(func) === -1) _reloadFunctions.push(func);
 	}
 	
+	/**
+	 * Adds or removes a function to be called just before Zotero is reloaded by switching into or
+	 * out of the connector
+	 */
+	this.addBeforeReloadListener = function(/** @param {Function} **/func) {
+		if(_beforeReloadFunctions.indexOf(func) === -1) _beforeReloadFunctions.push(func);
+	}
+	
 	/**
 	 * Implements nsIObserver for Zotero reload
 	 */
@@ -4113,9 +4125,14 @@ var ZoteroPane = new function()
 		/**
 		 * Called when Zotero is reloaded (i.e., if it is switched into or out of connector mode)
 		 */
-		"observe":function() {
-			Zotero.debug("Reloading Zotero pane");
-			for each(var func in _reloadFunctions) func();
+		"observe":function(aSubject, aTopic, aData) {
+			if(aTopic == "zotero-reloaded") {
+				Zotero.debug("Reloading Zotero pane");
+				for each(var func in _reloadFunctions) func(aData);
+			} else if(aTopic == "zotero-before-reload") {
+				Zotero.debug("Zotero pane caught before-reload event");
+				for each(var func in _beforeReloadFunctions) func(aData);
+			}
 		}
 	};
 }

chrome/locale/en-US/zotero/zotero.properties

@@ -944,6 +944,7 @@ standalone.updateMessage			= A recommended update is available, but you do not h
 
 connector.error.title				= Zotero Connector Error
 connector.standaloneOpen			= Your database cannot be accessed because Zotero Standalone is currently open. Please view your items in Zotero Standalone.
+connector.loadInProgress			= Zotero Standalone was launched but is not accessible. If you experienced an error opening Zotero Standalone, restart Firefox.
 
 firstRunGuidance.saveIcon		= Zotero has found a reference on this page. Click this icon in the address bar to save the reference to your Zotero library.
 firstRunGuidance.authorMenu		= Zotero lets you specify editors and translators, too. You can turn an author into an editor or translator by selecting from this menu.

components/zotero-service.js

@@ -120,6 +120,7 @@ const xpcomFilesConnector = [
 ];
 
 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+Components.utils.import("resource://gre/modules/Services.jsm");
 
 var instanceID = (new Date()).getTime();
 var isFirstLoadThisSession = true;
@@ -164,6 +165,7 @@ ZoteroContext.prototype = {
 	 */
 	"switchConnectorMode":function(isConnector) {
 		if(isConnector !== this.isConnector) {
+			Services.obs.notifyObservers(zContext.Zotero, "zotero-before-reload", isConnector ? "connector" : "full");
 			zContext.Zotero.shutdown().then(function() {
 				// create a new zContext
 				makeZoteroContext(isConnector);