Ability to share selective exports (#1752)

lib/pages/apps.dart

@@ -917,6 +917,27 @@ class AppsPageState extends State<AppsPage> {
                                 },
                           child: Text(tr('shareAppConfigLinks'))),
                       const Divider(),
+                      TextButton(
+                          onPressed: selectedAppIds.isEmpty
+                              ? null
+                              : () {
+                                  var exportJSON = jsonEncode(
+                                      appsProvider.generateExportJSON(
+                                          appIds: selectedApps
+                                              .map((e) => e.id)
+                                              .toList(),
+                                          overrideExportSettings: false));
+                                  XFile f = XFile.fromData(
+                                      Uint8List.fromList(
+                                          utf8.encode(exportJSON)),
+                                      mimeType: 'application/json',
+                                      name:
+                                          '${tr('obtainiumExportHyphenatedLowercase')}-${selectedApps.length}-${DateTime.now().millisecondsSinceEpoch}');
+                                  Share.shareXFiles([f]);
+                                },
+                          child: Text(
+                              '${tr('share')} - ${tr('obtainiumExport')}')),
+                      const Divider(),
                       TextButton(
                           onPressed: () {
                             appsProvider

lib/providers/apps_provider.dart

@@ -1501,6 +1501,34 @@ class AppsProvider with ChangeNotifier {
     return updateAppIds;
   }
 
+  Map<String, dynamic> generateExportJSON(
+      {List<String>? appIds, bool? overrideExportSettings}) {
+    Map<String, dynamic> finalExport = {};
+    finalExport['apps'] = apps.values
+        .where((e) {
+          if (appIds == null) {
+            return true;
+          } else {
+            return appIds.contains(e.app.id);
+          }
+        })
+        .map((e) => e.app.toJson())
+        .toList();
+    bool shouldExportSettings = settingsProvider.exportSettings;
+    if (overrideExportSettings != null) {
+      shouldExportSettings = overrideExportSettings;
+    }
+    if (shouldExportSettings) {
+      finalExport['settings'] = Map<String, Object?>.fromEntries(
+          (settingsProvider.prefs
+                  ?.getKeys()
+                  .map((key) => MapEntry(key, settingsProvider.prefs?.get(key)))
+                  .toList()) ??
+              []);
+    }
+    return finalExport;
+  }
+
   Future<String?> export(
       {bool pickOnly = false, isAuto = false, SettingsProvider? sp}) async {
     SettingsProvider settingsProvider = sp ?? this.settingsProvider;
@@ -1531,17 +1559,7 @@ class AppsProvider with ChangeNotifier {
     }
     String? returnPath;
     if (!pickOnly) {
-      Map<String, dynamic> finalExport = {};
+      Map<String, dynamic> finalExport = generateExportJSON();
-      finalExport['apps'] = apps.values.map((e) => e.app.toJson()).toList();
-      if (settingsProvider.exportSettings) {
-        finalExport['settings'] = Map<String, Object?>.fromEntries(
-            (settingsProvider.prefs
-                    ?.getKeys()
-                    .map((key) =>
-                        MapEntry(key, settingsProvider.prefs?.get(key)))
-                    .toList()) ??
-                []);
-      }
       var result = await saf.createFile(exportDir,
           displayName:
               '${tr('obtainiumExportHyphenatedLowercase')}-${DateTime.now().toIso8601String().replaceAll(':', '-')}${isAuto ? '-auto' : ''}.json',