Make Setting Migrations independent of the Settings class

That class is going to lose many of its members, and I don't want to
keep the old ones just for compatibility sake.

Also give each setting the concept on an id - will be used later.

lib/app.dart

@@ -44,7 +44,7 @@ class JournalApp extends StatefulWidget {
       gitBaseDir: gitBaseDirectory,
       cacheDir: cacheDir,
       pref: pref,
-      name: "journal",
+      id: "0",
     );
 
     Widget app = ChangeNotifierProvider.value(

lib/repository.dart

@@ -37,7 +37,7 @@ class Repository with ChangeNotifier {
 
   final String gitBaseDirectory;
   final String cacheDir;
-  final String name;
+  final String id;
 
   GitNoteRepository _gitRepo;
   NotesCache _notesCache;
@@ -59,12 +59,12 @@ class Repository with ChangeNotifier {
     @required String gitBaseDir,
     @required String cacheDir,
     @required SharedPreferences pref,
-    @required String name,
+    @required String id,
   }) async {
-    var settings = Settings(name);
-    settings.load(pref);
+    await migrateSettings(pref, gitBaseDir);
 
-    await migrateSettings(settings, pref, gitBaseDir);
+    var settings = Settings(id);
+    settings.load(pref);
 
     logEvent(Event.Settings, parameters: settings.toLoggableMap());
 
@@ -88,9 +88,7 @@ class Repository with ChangeNotifier {
     var remoteConfigured = false;
 
     if (repoDirStat.type != FileSystemEntityType.directory) {
-      settings.folderName = name;
-
-      Log.i("Calling GitInit for $name at: $repoPath");
+      Log.i("Calling GitInit for ${settings.folderName} at: $repoPath");
       await GitRepository.init(repoPath);
 
       settings.save();
@@ -106,12 +104,12 @@ class Repository with ChangeNotifier {
       cacheDir: cacheDir,
       remoteGitRepoConfigured: remoteConfigured,
       settings: settings,
-      name: name,
+      id: id,
     );
   }
 
   Repository._internal({
-    @required this.name,
+    @required this.id,
     @required this.repoPath,
     @required this.gitBaseDirectory,
     @required this.cacheDir,

lib/settings.dart

@@ -8,11 +8,14 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:gitjournal/core/sorting_mode.dart';
 import 'package:gitjournal/folder_views/common.dart';
 import 'package:gitjournal/screens/note_editor.dart';
+import 'package:uuid/uuid.dart';
 
 class Settings extends ChangeNotifier {
-  Settings(this.folderName);
+  Settings(this.id);
 
-  String folderName;
+  final String id;
+
+  String folderName = "journal";
 
   // Properties
   String gitAuthor = "GitJournal";
@@ -142,7 +145,7 @@ class Settings extends ChangeNotifier {
 
   Future<void> save() async {
     var pref = await SharedPreferences.getInstance();
-    var defaultSet = Settings(folderName);
+    var defaultSet = Settings(id);
 
     _setString(pref, "gitAuthor", gitAuthor, defaultSet.gitAuthor);
     _setString(
@@ -709,3 +712,7 @@ class SettingsHomeScreen {
     return "";
   }
 }
+
+String generateRandomId() {
+  return Uuid().v4().substring(0, 8);
+}

lib/settings_migrations.dart

@@ -3,15 +3,18 @@ import 'dart:io';
 import 'package:path/path.dart' as p;
 import 'package:shared_preferences/shared_preferences.dart';
 
-import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/utils/logger.dart';
 
 Future<void> migrateSettings(
-  Settings settings,
   SharedPreferences pref,
   String gitBaseDir,
 ) async {
-  if (settings.version == 0) {
+  var version = pref.getInt('settingsVersion') ?? '-1';
+  if (version == -1) {
+    return;
+  }
+
+  if (version == 0) {
     Log.i("Migrating settings from v0 -> v1");
     var cache = p.join(gitBaseDir, "cache.json");
     if (File(cache).existsSync()) {
@@ -29,9 +32,9 @@ Future<void> migrateSettings(
       var newName = p.join(gitBaseDir, "journal");
 
       await Directory(oldName).rename(newName);
-      settings.folderName = "journal";
+      var folderName = "journal";
 
-      pref.setString('remoteGitRepoPath', settings.folderName);
+      await pref.setString('remoteGitRepoPath', folderName);
     }
 
     var oldDir = Directory(p.join(gitBaseDir, '../files'));
@@ -67,9 +70,12 @@ Future<void> migrateSettings(
       var publicKeyExists = File(sshPublicKeyPath).existsSync();
       var privateKeyExists = File(sshPrivateKeyPath).existsSync();
       if (publicKeyExists && privateKeyExists) {
-        settings.sshPublicKey = await File(sshPublicKeyPath).readAsString();
-        settings.sshPrivateKey = await File(sshPrivateKeyPath).readAsString();
-        settings.sshPassword = "";
+        var sshPublicKey = await File(sshPublicKeyPath).readAsString();
+        var sshPrivateKey = await File(sshPrivateKeyPath).readAsString();
+
+        await pref.setString("sshPublicKey", sshPublicKey);
+        await pref.setString("sshPrivateKey", sshPrivateKey);
+        await pref.setString("sshPassword", "");
       }
 
       await oldSshDir.delete(recursive: true);
@@ -83,15 +89,18 @@ Future<void> migrateSettings(
       var publicKeyExists = File(sshPublicKeyPath).existsSync();
       var privateKeyExists = File(sshPrivateKeyPath).existsSync();
       if (publicKeyExists && privateKeyExists) {
-        settings.sshPublicKey = await File(sshPublicKeyPath).readAsString();
-        settings.sshPrivateKey = await File(sshPrivateKeyPath).readAsString();
-        settings.sshPassword = "";
+        var sshPublicKey = await File(sshPublicKeyPath).readAsString();
+        var sshPrivateKey = await File(sshPrivateKeyPath).readAsString();
+
+        await pref.setString("sshPublicKey", sshPublicKey);
+        await pref.setString("sshPrivateKey", sshPrivateKey);
+        await pref.setString("sshPassword", "");
       }
 
       await newSshDir.delete(recursive: true);
     }
 
-    settings.version = 1;
-    pref.setInt("settingsVersion", settings.version);
+    version = 1;
+    await pref.setInt("settingsVersion", version);
   }
 }