RepoManager: Implement deleting a repo

This is ugly as fuck. All of the settings pages need a more coherent
look and feel, and need to be organized better.

This finished the implementation of multiple repos.

Fixes #229

assets/langs/en.yaml

@@ -152,6 +152,7 @@ settings:
     title: Bottom Menu Bar
     subtitle: Configure its appearance and behaviour
     enable: Enable Buttom Menu Bar
+  deleteRepo: Delete Repository
 
 editors:
   checklist:

lib/repository_manager.dart

@@ -88,4 +88,28 @@ class RepositoryManager with ChangeNotifier {
     Log.i("Switching to repo with id: $id");
     await buildActiveRepository();
   }
+
+  Future<void> deleteCurrent() async {
+    if (repoIds.length == 1) {
+      throw Exception("Last Repo cannot be deleted");
+    }
+
+    Log.i("Deleting repo: $currentId");
+
+    var i = repoIds.indexOf(currentId);
+
+    var repoPath = _repo.repoPath;
+    var cachePath = _repo.cacheDir;
+
+    await Directory(repoPath).delete(recursive: true);
+    await Directory(cachePath).delete(recursive: true);
+
+    repoIds.removeAt(i);
+
+    i = i.clamp(0, repoIds.length - 1);
+    currentId = repoIds[i];
+
+    await _save();
+    await buildActiveRepository();
+  }
 }

lib/screens/settings_git_remote.dart

@@ -180,7 +180,9 @@ class _GitRemoteSettingsScreenState extends State<GitRemoteSettingsScreen> {
   void _resetGitHost() async {
     var ok = await showDialog(
       context: context,
-      builder: (_) => HostChangeConfirmationDialog(),
+      builder: (_) => IrreversibleActionConfirmationDialog(
+        tr("settings.gitRemote.changeHost.title"),
+      ),
     );
     if (ok == null) {
       return;
@@ -266,11 +268,15 @@ class RedButton extends StatelessWidget {
   }
 }
 
-class HostChangeConfirmationDialog extends StatelessWidget {
+class IrreversibleActionConfirmationDialog extends StatelessWidget {
+  final String title;
+
+  IrreversibleActionConfirmationDialog(this.title);
+
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
-      title: Text(tr("settings.gitRemote.changeHost.title")),
+      title: Text(title),
       content: Text(tr("settings.gitRemote.changeHost.subtitle")),
       actions: <Widget>[
         FlatButton(

lib/screens/settings_screen.dart

@@ -17,6 +17,7 @@ import 'package:gitjournal/app_settings.dart';
 import 'package:gitjournal/core/notes_folder_fs.dart';
 import 'package:gitjournal/features.dart';
 import 'package:gitjournal/repository.dart';
+import 'package:gitjournal/repository_manager.dart';
 import 'package:gitjournal/screens/debug_screen.dart';
 import 'package:gitjournal/screens/feature_timeline_screen.dart';
 import 'package:gitjournal/screens/settings_bottom_menu_bar.dart';
@@ -69,6 +70,7 @@ class SettingsListState extends State<SettingsList> {
     var settings = Provider.of<Settings>(context);
     var appSettings = Provider.of<AppSettings>(context);
     final repo = Provider.of<GitJournalRepo>(context);
+    var repoManager = Provider.of<RepositoryManager>(context);
 
     var saveGitAuthor = (String gitAuthor) {
       settings.gitAuthor = gitAuthor;
@@ -377,6 +379,26 @@ class SettingsListState extends State<SettingsList> {
           Navigator.of(context).push(route);
         },
       ),
+      if (repoManager.repoIds.length > 1)
+        RedButton(
+          text: tr('settings.deleteRepo'),
+          onPressed: () async {
+            var ok = await showDialog(
+              context: context,
+              builder: (_) => IrreversibleActionConfirmationDialog(
+                tr('settings.deleteRepo'),
+              ),
+            );
+            if (ok == null) {
+              return;
+            }
+
+            var repoManager = context.read<RepositoryManager>();
+            await repoManager.deleteCurrent();
+
+            Navigator.popUntil(context, (route) => route.isFirst);
+          },
+        ),
       const SizedBox(height: 16.0),
       ListTile(
         title: Text(tr("feature_timeline.title")),