Rename Folders properly

1. Actually rename the folder instead of calling rename with the oldPath
2. Inform the parentFolder that a sub-folder has been renamed so it can
accordingly update its mapping.

Fixes #108

lib/core/note_notifier.dart

@@ -15,6 +15,7 @@ class NotesNotifier implements ChangeNotifier {
   }
 
   void removeModifiedListener(NoteModificationCallback listener) {
+    assert(_modListeners.contains(listener));
     _modListeners.remove(listener);
   }
 
@@ -23,6 +24,7 @@ class NotesNotifier implements ChangeNotifier {
   }
 
   void removeRenameListener(NoteRenameCallback listener) {
+    assert(_renameListeners.contains(listener));
     _renameListeners.remove(listener);
   }
 

lib/core/notes_folder_fs.dart

@@ -49,6 +49,14 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
     assert(_entityMap.containsKey(oldPath));
     _entityMap.remove(oldPath);
     _entityMap[note.filePath] = note;
+
+    notifyNoteRenamed(-1, note, oldPath);
+  }
+
+  void _subFolderRenamed(NotesFolderFS folder, String oldPath) {
+    assert(_entityMap.containsKey(oldPath));
+    _entityMap.remove(oldPath);
+    _entityMap[folder.folderPath] = folder;
   }
 
   void reset(String folderPath) {
@@ -183,7 +191,8 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
         if (subFolder.name.startsWith('.')) {
           continue;
         }
-        subFolder.addListener(_entityChanged);
+        //Log.d("Found folder ${fsEntity.path}");
+        _addFolderListeners(subFolder);
 
         _folders.add(subFolder);
         _entityMap[fsEntity.path] = subFolder;
@@ -199,8 +208,7 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
         continue;
       }
       //Log.d("Found file ${fsEntity.path}");
-      note.addModifiedListener(_noteModified);
-      note.addRenameListener(_noteRenamed);
+      _addNoteListeners(note);
 
       _notes.add(note);
       _entityMap[fsEntity.path] = note;
@@ -219,7 +227,8 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
 
       if (e is Note) {
         Log.d("File $path was no longer found");
-        e.removeModifiedListener(_noteModified);
+        _removeNoteListeners(e);
+
         var i = _notes.indexWhere((n) => n.filePath == path);
         assert(i != -1);
         var note = _notes[i];
@@ -227,7 +236,8 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
         notifyNoteRemoved(i, note);
       } else {
         Log.d("Folder $path was no longer found");
-        e.removeListener(_entityChanged);
+        _removeFolderListeners(e);
+
         var i = _folders.indexWhere((f) => f.folderPath == path);
         assert(i != -1);
         var folder = _folders[i];
@@ -239,7 +249,7 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
 
   void add(Note note) {
     assert(note.parent == this);
-    note.addModifiedListener(_noteModified);
+    _addNoteListeners(note);
 
     _notes.add(note);
     _entityMap[note.filePath] = note;
@@ -249,8 +259,7 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
 
   void remove(Note note) {
     assert(note.parent == this);
-    note.removeModifiedListener(_noteModified);
-    note.removeRenameListener(_noteRenamed);
+    _removeNoteListeners(note);
 
     assert(_notes.indexWhere((n) => n.filePath == note.filePath) != -1);
     assert(_entityMap.containsKey(note.filePath));
@@ -263,6 +272,16 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
     notifyNoteRemoved(index, note);
   }
 
+  void _addNoteListeners(Note note) {
+    note.addModifiedListener(_noteModified);
+    note.addRenameListener(_noteRenamed);
+  }
+
+  void _removeNoteListeners(Note note) {
+    note.removeModifiedListener(_noteModified);
+    note.removeRenameListener(_noteRenamed);
+  }
+
   void create() {
     // Git doesn't track Directories, only files, so we create an empty .gitignore file
     // in the directory instead.
@@ -276,7 +295,7 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
 
   void addFolder(NotesFolderFS folder) {
     assert(folder.parent == this);
-    folder.addListener(_entityChanged);
+    _addFolderListeners(folder);
 
     _folders.add(folder);
     _entityMap[folder.folderPath] = folder;
@@ -285,7 +304,7 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
   }
 
   void removeFolder(NotesFolderFS folder) {
-    folder.removeListener(_entityChanged);
+    _removeFolderListeners(folder);
 
     assert(_folders.indexWhere((f) => f.folderPath == folder.folderPath) != -1);
     assert(_entityMap.containsKey(folder.folderPath));
@@ -299,12 +318,22 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
   }
 
   void rename(String newName) {
-    var dir = Directory(folderPath);
-    var parentDirName = dirname(folderPath);
-    dir.renameSync(folderPath);
-    _folderPath = p.join(parentDirName, newName);
+    var oldPath = _folderPath;
+    var dir = Directory(_folderPath);
+    _folderPath = p.join(dirname(_folderPath), newName);
+    dir.renameSync(_folderPath);
 
-    notifyListeners();
+    notifyThisFolderRenamed(this, oldPath);
+  }
+
+  void _addFolderListeners(NotesFolderFS folder) {
+    folder.addListener(_entityChanged);
+    folder.addThisFolderRenamedListener(_subFolderRenamed);
+  }
+
+  void _removeFolderListeners(NotesFolderFS folder) {
+    folder.removeListener(_entityChanged);
+    folder.removeThisFolderRenamedListener(_subFolderRenamed);
   }
 
   @override

lib/core/notes_folder_notifier.dart

@@ -1,11 +1,14 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/foundation.dart';
+import 'package:gitjournal/core/notes_folder_fs.dart';
 
 import 'note.dart';
 import 'notes_folder.dart';
 
 typedef FolderNotificationCallback = void Function(
     int index, NotesFolder folder);
+typedef FolderRenamedCallback = void Function(
+    NotesFolderFS folder, String oldPath);
 typedef NoteNotificationCallback = void Function(int index, Note note);
 typedef NoteRenamedCallback = void Function(
     int index, Note note, String oldPath);
@@ -13,6 +16,7 @@ typedef NoteRenamedCallback = void Function(
 class NotesFolderNotifier implements ChangeNotifier {
   var _folderAddedListeners = ObserverList<FolderNotificationCallback>();
   var _folderRemovedListeners = ObserverList<FolderNotificationCallback>();
+  var _thisFolderRenamedListeners = ObserverList<FolderRenamedCallback>();
 
   var _noteAddedListeners = ObserverList<NoteNotificationCallback>();
   var _noteRemovedListeners = ObserverList<NoteNotificationCallback>();
@@ -24,6 +28,7 @@ class NotesFolderNotifier implements ChangeNotifier {
   }
 
   void removeFolderRemovedListener(FolderNotificationCallback listener) {
+    assert(_folderRemovedListeners.contains(listener));
     _folderRemovedListeners.remove(listener);
   }
 
@@ -32,14 +37,25 @@ class NotesFolderNotifier implements ChangeNotifier {
   }
 
   void removeFolderAddedListener(FolderNotificationCallback listener) {
+    assert(_folderAddedListeners.contains(listener));
     _folderAddedListeners.remove(listener);
   }
 
+  void addThisFolderRenamedListener(FolderRenamedCallback listener) {
+    _thisFolderRenamedListeners.add(listener);
+  }
+
+  void removeThisFolderRenamedListener(FolderRenamedCallback listener) {
+    assert(_thisFolderRenamedListeners.contains(listener));
+    _thisFolderRenamedListeners.remove(listener);
+  }
+
   void addNoteAddedListener(NoteNotificationCallback listener) {
     _noteAddedListeners.add(listener);
   }
 
   void removeNoteAddedListener(NoteNotificationCallback listener) {
+    assert(_noteAddedListeners.contains(listener));
     _noteAddedListeners.remove(listener);
   }
 
@@ -48,6 +64,7 @@ class NotesFolderNotifier implements ChangeNotifier {
   }
 
   void removeNoteRemovedListener(NoteNotificationCallback listener) {
+    assert(_noteRemovedListeners.contains(listener));
     _noteRemovedListeners.remove(listener);
   }
 
@@ -56,6 +73,7 @@ class NotesFolderNotifier implements ChangeNotifier {
   }
 
   void removeNoteModifiedListener(NoteNotificationCallback listener) {
+    assert(_noteModifiedListeners.contains(listener));
     _noteModifiedListeners.remove(listener);
   }
 
@@ -64,6 +82,7 @@ class NotesFolderNotifier implements ChangeNotifier {
   }
 
   void removeNoteRenameListener(NoteRenamedCallback listener) {
+    assert(_noteRenameListeners.contains(listener));
     _noteRenameListeners.remove(listener);
   }
 
@@ -72,6 +91,7 @@ class NotesFolderNotifier implements ChangeNotifier {
   void dispose() {
     _folderAddedListeners = null;
     _folderRemovedListeners = null;
+    _thisFolderRenamedListeners = null;
     _noteAddedListeners = null;
     _noteRemovedListeners = null;
     _noteModifiedListeners = null;
@@ -123,6 +143,34 @@ class NotesFolderNotifier implements ChangeNotifier {
     _notifyFolderCallback(_folderRemovedListeners, index, folder);
   }
 
+  void notifyThisFolderRenamed(NotesFolderFS folder, String oldPath) {
+    final localListeners =
+        List<FolderRenamedCallback>.from(_thisFolderRenamedListeners);
+    for (var listener in localListeners) {
+      try {
+        if (_thisFolderRenamedListeners.contains(listener)) {
+          listener(folder, oldPath);
+        }
+      } catch (exception, stack) {
+        FlutterError.reportError(FlutterErrorDetails(
+          exception: exception,
+          stack: stack,
+          library: 'GitJournal',
+          context: ErrorDescription(
+              'while dispatching notifications for $runtimeType'),
+          informationCollector: () sync* {
+            yield DiagnosticsProperty<ChangeNotifier>(
+              'The $runtimeType sending notification was',
+              this,
+              style: DiagnosticsTreeStyle.errorProperty,
+            );
+          },
+        ));
+      }
+    }
+    notifyListeners();
+  }
+
   void _notifyNoteCallback(
     ObserverList<NoteNotificationCallback> _listeners,
     int index,
@@ -170,13 +218,10 @@ class NotesFolderNotifier implements ChangeNotifier {
   }
 
   void notifyNoteRenamed(int index, Note note, String oldPath) {
-    if (_listeners == null) {
-      return;
-    }
     final localListeners = List<NoteRenamedCallback>.from(_noteRenameListeners);
     for (var listener in localListeners) {
       try {
-        if (_listeners.contains(listener)) {
+        if (_noteRenameListeners.contains(listener)) {
           listener(index, note, oldPath);
         }
       } catch (exception, stack) {

lib/state_container.dart

@@ -162,6 +162,7 @@ class StateContainer with ChangeNotifier {
   void renameFolder(NotesFolderFS folder, String newFolderName) async {
     return _opLock.synchronized(() async {
       var oldFolderPath = folder.folderPath;
+      print("Renaming Folder from $oldFolderPath -> $newFolderName");
       folder.rename(newFolderName);
 
       _gitRepo