data exporting & importing

lib/utils/data.dart

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+import 'dart:isolate';
+
+import 'package:venera/foundation/app.dart';
+import 'package:venera/foundation/appdata.dart';
+import 'package:venera/foundation/comic_source/comic_source.dart';
+import 'package:venera/foundation/favorites.dart';
+import 'package:venera/foundation/history.dart';
+import 'package:zip_flutter/zip_flutter.dart';
+
+import 'io.dart';
+
+Future<File> exportAppData() async {
+  var time = DateTime.now().millisecondsSinceEpoch ~/ 1000;
+  var cacheFilePath = FilePath.join(App.cachePath, '$time.venera');
+  var cacheFile = File(cacheFilePath);
+  var dataPath = App.dataPath;
+  if(await cacheFile.exists()) {
+    await cacheFile.delete();
+  }
+  await Isolate.run(() {
+    var zipFile = ZipFile.open(cacheFilePath);
+    var historyFile = FilePath.join(dataPath, "history.db");
+    var localFavoriteFile = FilePath.join(dataPath, "local_favorite.db");
+    var appdata = FilePath.join(dataPath, "appdata.json");
+    zipFile.addFile("history.db", historyFile);
+    zipFile.addFile("local_favorite.db", localFavoriteFile);
+    zipFile.addFile("appdata.json", appdata);
+    for(var file in Directory(FilePath.join(dataPath, "comic_source")).listSync()) {
+      if(file is File) {
+        zipFile.addFile("comic_source/${file.name}", file.path);
+      }
+    }
+    zipFile.close();
+  });
+  return cacheFile;
+}
+
+Future<void> importAppData(File file) async {
+  var cacheDirPath = FilePath.join(App.cachePath, 'temp_data');
+  var cacheDir = Directory(cacheDirPath);
+  await Isolate.run(() {
+    ZipFile.openAndExtract(file.path, cacheDirPath);
+  });
+  var historyFile = cacheDir.joinFile("history.db");
+  var localFavoriteFile = cacheDir.joinFile("local_favorite.db");
+  var appdataFile = cacheDir.joinFile("appdata.json");
+  if(await historyFile.exists()) {
+    HistoryManager().close();
+    await historyFile.copy(FilePath.join(App.dataPath, "history.db"));
+    HistoryManager().init();
+  }
+  if(await localFavoriteFile.exists()) {
+    LocalFavoritesManager().close();
+    await localFavoriteFile.copy(FilePath.join(App.dataPath, "local_favorite.db"));
+    LocalFavoritesManager().init();
+  }
+  if(await appdataFile.exists()) {
+    await appdataFile.copy(FilePath.join(App.dataPath, "appdata.json"));
+    appdata.init();
+  }
+  var comicSourceDir = FilePath.join(cacheDirPath, "comic_source");
+  if(Directory(comicSourceDir).existsSync()) {
+    for(var file in Directory(comicSourceDir).listSync()) {
+      if(file is File) {
+        var targetFile = FilePath.join(App.dataPath, "comic_source", file.name);
+        await file.copy(targetFile);
+      }
+    }
+    await ComicSource.reload();
+  }
+}