Allow opening relative links while are notes

lib/core/notes_folder_fs.dart

@@ -349,6 +349,37 @@ class NotesFolderFS with NotesFolderNotifier implements NotesFolder {
     return null;
   }
 
+  Note getNoteWithSpec(String spec) {
+    var parts = spec.split(p.separator);
+    var folder = this;
+    while (parts.length != 1) {
+      var folderName = parts[0];
+
+      bool foundFolder = false;
+      for (var f in _folders) {
+        if (f.name == folderName) {
+          folder = f;
+          foundFolder = true;
+          break;
+        }
+      }
+
+      if (!foundFolder) {
+        return null;
+      }
+      parts.removeAt(0);
+    }
+
+    var fileName = parts[0];
+    for (var note in folder.notes) {
+      if (note.fileName == fileName) {
+        return note;
+      }
+    }
+
+    return null;
+  }
+
   @override
   NotesFolderConfig get config {
     if (Features.perFolderConfig && _config != null) {

lib/folder_views/common.dart

@@ -25,20 +25,7 @@ Widget buildFolderView(
   StandardViewHeader header,
   bool showSummary,
 ) {
-  var noteSelectionFn = (Note note) async {
-    var route = MaterialPageRoute(
-      builder: (context) => NoteEditor.fromNote(note),
-    );
-    var showUndoSnackBar = await Navigator.of(context).push(route);
-    if (showUndoSnackBar != null) {
-      Fimber.d("Showing an undo snackbar");
-
-      var snackBar = buildUndoDeleteSnackbar(context, note);
-      Scaffold.of(context)
-        ..removeCurrentSnackBar()
-        ..showSnackBar(snackBar);
-    }
-  };
+  var noteSelectionFn = (Note note) => openNoteEditor(context, note);
 
   switch (viewType) {
     case FolderViewType.Standard:
@@ -72,3 +59,18 @@ Widget buildFolderView(
   assert(false, "Code path should never be executed");
   return Container();
 }
+
+void openNoteEditor(BuildContext context, Note note) async {
+  var route = MaterialPageRoute(
+    builder: (context) => NoteEditor.fromNote(note),
+  );
+  var showUndoSnackBar = await Navigator.of(context).push(route);
+  if (showUndoSnackBar != null) {
+    Fimber.d("Showing an undo snackbar");
+
+    var snackBar = buildUndoDeleteSnackbar(context, note);
+    Scaffold.of(context)
+      ..removeCurrentSnackBar()
+      ..showSnackBar(snackBar);
+  }
+}

lib/widgets/note_viewer.dart

@@ -1,10 +1,14 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_markdown/flutter_markdown.dart';
+import 'package:gitjournal/folder_views/common.dart';
+import 'package:gitjournal/utils.dart';
+import 'package:provider/provider.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'package:path/path.dart' as p;
 
 import 'package:gitjournal/core/note.dart';
+import 'package:gitjournal/core/notes_folder_fs.dart';
 
 class NoteViewer extends StatelessWidget {
   final Note note;
@@ -49,8 +53,19 @@ class NoteViewer extends StatelessWidget {
               data: note.body,
               styleSheet: markdownStyleSheet,
               onTapLink: (String link) {
-                print("Launching " + link);
-                launch(link);
+                if (link.startsWith('./')) {
+                  final rootFolder = Provider.of<NotesFolderFS>(context);
+                  var spec = link.substring(2);
+                  var note = rootFolder.getNoteWithSpec(spec);
+                  if (note != null) {
+                    openNoteEditor(context, note);
+                  } else {
+                    showSnackbar(context, "Link '$link' not found");
+                  }
+                } else {
+                  print("Launching " + link);
+                  launch(link);
+                }
               },
               imageDirectory: note.parent.folderPath + p.separator,
             ),