app [nfc]: Pull out _handleGenerateInitialRoutes

Author: rajveermalviya

lib/widgets/app.dart

@@ -152,6 +152,21 @@ class _ZulipAppState extends State<ZulipApp> with WidgetsBindingObserver {
     super.dispose();
   }
 
+  List<Route<dynamic>> _handleGenerateInitialRoutes(
+    BuildContext context,
+    String initialRoute,
+  ) {
+    // TODO(#524) choose initial account as last one used
+    final globalStore = GlobalStoreWidget.of(context);
+    final initialAccountId = globalStore.accounts.firstOrNull?.id;
+    return [
+      if (initialAccountId == null)
+        MaterialWidgetRoute(page: const ChooseAccountPage())
+      else
+        HomePage.buildRoute(accountId: initialAccountId),
+    ];
+  }
+
   Future<void> _handleInitialRoute() async {
     final initialRouteUrl = Uri.parse(WidgetsBinding.instance.platformDispatcher.defaultRouteName);
     if (initialRouteUrl case Uri(scheme: 'zulip', host: 'notification')) {
@@ -177,7 +192,6 @@ class _ZulipAppState extends State<ZulipApp> with WidgetsBindingObserver {
     final themeData = zulipThemeData(context);
     return GlobalStoreWidget(
       child: Builder(builder: (context) {
-        final globalStore = GlobalStoreWidget.of(context);
         return MaterialApp(
           title: 'Zulip',
           localizationsDelegates: ZulipLocalizations.localizationsDelegates,
@@ -204,16 +218,8 @@ class _ZulipAppState extends State<ZulipApp> with WidgetsBindingObserver {
           // like [Navigator.push], never mere names as with [Navigator.pushNamed].
           onGenerateRoute: (_) => null,
 
-          onGenerateInitialRoutes: (_) {
-            // TODO(#524) choose initial account as last one used
-            final initialAccountId = globalStore.accounts.firstOrNull?.id;
-            return [
-              if (initialAccountId == null)
-                MaterialWidgetRoute(page: const ChooseAccountPage())
-              else
-                HomePage.buildRoute(accountId: initialAccountId),
-            ];
-          });
+          onGenerateInitialRoutes: (initialRoute) =>
+            _handleGenerateInitialRoutes(context, initialRoute));
         }));
   }
 }