Allow the 'created' YAML metadata to be configured

Related to #206

assets/langs/en.yaml

@@ -43,6 +43,7 @@ settings:
     text: Every note has some metadata which is stored in a YAML Header as follows -
     enableHeader: Enable YAML Header
     modified: Modified Field
+    created: Created Field
     example:
       title: Example Title
     titleMetaData:

lib/core/note_serializer.dart

@@ -18,7 +18,7 @@ var emojiParser = EmojiParser();
 
 class NoteSerializationSettings {
   String modifiedKey = Settings.instance.yamlModifiedKey;
-  String createdKey = "created";
+  String createdKey = Settings.instance.yamlCreatedKey;
   String titleKey = "title";
   String typeKey = "type";
   String tagsKey = "tags";
@@ -87,18 +87,29 @@ class NoteSerializer implements NoteSerializerInterface {
       "lastmodified",
       "lastmod",
     ];
-    for (var i = 0; i < modifiedKeyOptions.length; i++) {
+    for (var possibleKey in modifiedKeyOptions) {
-      var possibleKey = modifiedKeyOptions[i];
+      var val = data.props[possibleKey];
-      var modifiedVal = data.props[possibleKey];
+      if (val != null) {
-      if (modifiedVal != null) {
+        note.modified = parseDateTime(val.toString());
-        note.modified = parseDateTime(modifiedVal.toString());
         settings.modifiedKey = possibleKey;
         break;
       }
     }
 
     note.body = emojiParser.emojify(data.body);
-    note.created = parseDateTime(data.props[settings.createdKey]?.toString());
+
+    var createdKeyOptions = [
+      "created",
+      "date",
+    ];
+    for (var possibleKey in createdKeyOptions) {
+      var val = data.props[possibleKey];
+      if (val != null) {
+        note.created = parseDateTime(val.toString());
+        settings.createdKey = possibleKey;
+        break;
+      }
+    }
 
     //
     // Title parsing

lib/screens/settings_note_metadata.dart

@@ -77,6 +77,23 @@ class _NoteMetadataSettingsScreenState
             enabled: Settings.instance.yamlHeaderEnabled,
           ),
         ),
+        ProOverlay(
+          child: ListPreference(
+            title: tr("settings.noteMetaData.created"),
+            options: [
+              "created",
+              "date",
+            ],
+            currentOption: Settings.instance.yamlCreatedKey,
+            onChange: (String newVal) {
+              setState(() {
+                Settings.instance.yamlCreatedKey = newVal;
+                Settings.instance.save();
+              });
+            },
+            enabled: Settings.instance.yamlHeaderEnabled,
+          ),
+        ),
         ProOverlay(
           child: ListPreference(
             title: tr("settings.noteMetaData.titleMetaData.title"),

lib/settings.dart

@@ -21,6 +21,8 @@ class Settings {
   bool collectCrashReports = true;
 
   String yamlModifiedKey = "modified";
+  String yamlCreatedKey = "created";
+
   bool yamlHeaderEnabled = true;
   String defaultNewNoteFolderSpec = "";
   String journalEditordefaultNewNoteFolderSpec = "";
@@ -68,6 +70,8 @@ class Settings {
         pref.getBool("collectCrashReports") ?? collectCrashReports;
 
     yamlModifiedKey = pref.getString("yamlModifiedKey") ?? yamlModifiedKey;
+    yamlCreatedKey = pref.getString("yamlCreatedKey") ?? yamlCreatedKey;
+
     yamlHeaderEnabled = pref.getBool("yamlHeaderEnabled") ?? yamlHeaderEnabled;
     defaultNewNoteFolderSpec =
         pref.getString("defaultNewNoteFolderSpec") ?? defaultNewNoteFolderSpec;
@@ -140,6 +144,8 @@ class Settings {
         defaultSet.collectCrashReports);
     _setString(
         pref, "yamlModifiedKey", yamlModifiedKey, defaultSet.yamlModifiedKey);
+    _setString(
+        pref, "yamlCreatedKey", yamlCreatedKey, defaultSet.yamlCreatedKey);
     _setBool(pref, "yamlHeaderEnabled", yamlHeaderEnabled,
         defaultSet.yamlHeaderEnabled);
     _setString(pref, "defaultNewNoteFolderSpec", defaultNewNoteFolderSpec,
@@ -225,6 +231,7 @@ class Settings {
       "collectUsageStatistics": collectUsageStatistics.toString(),
       "collectCrashReports": collectCrashReports.toString(),
       "yamlModifiedKey": yamlModifiedKey,
+      "yamlCreatedKey": yamlCreatedKey,
       "yamlHeaderEnabled": yamlHeaderEnabled.toString(),
       "defaultNewNoteFolderSpec": defaultNewNoteFolderSpec,
       "journalEditordefaultNewNoteFolderSpec":