Experiment with the concept of Transformers

lib/core/transformers/base.dart

@@ -0,0 +1,15 @@
+import 'package:gitjournal/core/note.dart';
+
+export 'package:gitjournal/core/note.dart';
+
+abstract class NoteReadTransformer {
+  Future<Note> onRead(Note note);
+}
+
+abstract class NoteWriteTransformer {
+  Future<Note> onWrite(Note note);
+}
+
+// ReadTransformersLoader(folderConfig) -> ...
+// WriteTransformerLoader(folderConfig) -> ...
+// -> test it out again

lib/core/transformers/emoji.dart

@@ -1,17 +1,21 @@
 import 'package:flutter_emoji/flutter_emoji.dart';
 
-import 'package:gitjournal/core/note.dart';
+import 'base.dart';
 
-class EmojiProcessor {
+class EmojiProcessor implements NoteReadTransformer, NoteWriteTransformer {
   static final _emojiParser = EmojiParser();
 
-  void onSave(Note note) {
+  @override
+  Future<Note> onRead(Note note) async {
     note.title = _emojiParser.emojify(note.title);
     note.body = _emojiParser.emojify(note.body);
+    return note;
   }
 
-  void onLoad(Note note) {
+  @override
+  Future<Note> onWrite(Note note) async {
     note.body = _emojiParser.unemojify(note.body);
     note.title = _emojiParser.unemojify(note.title);
+    return note;
   }
 }