Move MdYamlDoc loading to its own class

lib/core/md_yaml_doc_loader.dart

@@ -0,0 +1,29 @@
+import 'dart:io';
+
+import 'package:gitjournal/core/md_yaml_doc.dart';
+import 'package:gitjournal/core/md_yaml_doc_codec.dart';
+
+class MdYamlDocLoader {
+  static final _serializer = MarkdownYAMLCodec();
+
+  Future<MdYamlDoc> loadDoc(String filePath) async {
+    // FIXME: What about parse errors?
+
+    final file = File(filePath);
+    if (!file.existsSync()) {
+      throw MdYamlDocNotFoundException(filePath);
+    }
+
+    final fileData = await file.readAsString();
+    var doc = _serializer.decode(fileData);
+    return doc;
+  }
+}
+
+class MdYamlDocNotFoundException implements Exception {
+  final String filePath;
+  MdYamlDocNotFoundException(this.filePath);
+
+  @override
+  String toString() => "MdYamlDocNotFoundException: $filePath";
+}

lib/core/note.dart

@@ -1,6 +1,7 @@
 import 'dart:io';
 
 import 'package:fimber/fimber.dart';
+import 'package:gitjournal/core/md_yaml_doc_loader.dart';
 import 'package:gitjournal/core/note_notifier.dart';
 import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/utils/markdown.dart';
@@ -37,6 +38,8 @@ class Note with NotesNotifier {
 
   String _summary;
 
+  static final _mdYamlDocLoader = MdYamlDocLoader();
+
   Note(this.parent, this._filePath);
 
   Note.newNote(this.parent) {
@@ -149,16 +152,14 @@ class Note with NotesNotifier {
       Fimber.d("Note modified: $_filePath");
     }
 
-    if (!file.existsSync()) {
+    try {
+      data = await _mdYamlDocLoader.loadDoc(_filePath);
+    } on MdYamlDocNotFoundException catch (_) {
       _loadState = NoteLoadState.NotExists;
       _notifyModified();
       return _loadState;
     }
 
-    // FIXME: This could throw an exception!
-    final string = await file.readAsString();
-    data = _serializer.decode(string);
-
     fileLastModified = file.lastModifiedSync();
     _loadState = NoteLoadState.Loaded;
 

test/md_yaml_doc_loader_test.dart

@@ -0,0 +1,38 @@
+import 'dart:io';
+
+import 'package:gitjournal/core/md_yaml_doc_loader.dart';
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+
+void main() {
+  group('MdYamlDocLoader', () {
+    Directory tempDir;
+    String filePath;
+    var contents = """---
+type: Journal
+foo: bar
+---
+
+Alright.""";
+
+    setUpAll(() async {
+      tempDir = await Directory.systemTemp.createTemp('__doc_loader_test__');
+      filePath = p.join(tempDir.path, "doc0");
+      await File(filePath).writeAsString(contents);
+    });
+
+    tearDownAll(() async {
+      tempDir.deleteSync(recursive: true);
+    });
+
+    test('Should load one doc', () async {
+      var loader = MdYamlDocLoader();
+      var doc = await loader.loadDoc(filePath);
+
+      expect(doc.body, "Alright.");
+      expect(doc.props["type"], "Journal");
+      expect(doc.props["foo"], "bar");
+      expect(doc.props.length, 2);
+    });
+  });
+}