Core: Finish null safety migration

lib/core/git_repo.dart

@@ -1,10 +1,6 @@
-// @dart=2.9
-
 import 'dart:async';
 import 'dart:io' show Platform;
 
-import 'package:flutter/foundation.dart';
-
 import 'package:dart_git/dart_git.dart' as git;
 import 'package:git_bindings/git_bindings.dart';
 
@@ -19,10 +15,10 @@ bool useDartGit = false;
 
 class NoteRepoResult {
   bool error;
-  String noteFilePath;
+  String? noteFilePath;
 
   NoteRepoResult({
-    @required this.error,
+    required this.error,
     this.noteFilePath,
   });
 }
@@ -33,10 +29,10 @@ class GitNoteRepository {
   final Settings settings;
 
   GitNoteRepository({
-    @required this.gitDirPath,
-    @required this.settings,
+    required this.gitDirPath,
+    required this.settings,
   }) : _gitRepo = GitRepo(folderPath: gitDirPath) {
-    // git-bindings aren't properly implemented in these platformsk
+    // git-bindings aren't properly implemented in these platforms
     if (Platform.isLinux || Platform.isMacOS || Platform.isWindows) {
       useDartGit = true;
     }
@@ -61,7 +57,9 @@ class GitNoteRepository {
   }
 
   Future<void> _commit(
-      {String message, String authorEmail, String authorName}) async {
+      {required String /*!*/ message,
+      required String authorEmail,
+      required String authorName}) async {
     if (useDartGit) {
       var repo = await git.GitRepository.load(gitDirPath);
       var author = git.GitAuthor(name: authorName, email: authorEmail);
@@ -225,6 +223,9 @@ class GitNoteRepository {
   Future<void> merge() async {
     var repo = await git.GitRepository.load(gitDirPath);
     var branch = await repo.currentBranch();
+    if (branch == null) {
+      throw Exception('No current branch found');
+    }
     var branchConfig = repo.config.branch(branch);
     if (branchConfig == null) {
       logExceptionWarning(
@@ -232,12 +233,9 @@ class GitNoteRepository {
       return;
     }
 
-    assert(branchConfig.name != null);
-    assert(branchConfig.merge != null);
-
     var remoteRef = await repo.remoteBranch(
-      branchConfig.remote,
-      branchConfig.trackingBranch(),
+      branchConfig.remote!,
+      branchConfig.trackingBranch()!,
     );
     if (remoteRef == null) {
       Log.i('Remote has no refs');
@@ -282,13 +280,15 @@ class GitNoteRepository {
     }
   }
 
-  Future<int> numChanges() async {
+  Future<int?> numChanges() async {
     try {
       var repo = await git.GitRepository.load(gitDirPath);
       var n = await repo.numChangesToPush();
       return n;
-    } catch (_) {}
-    return 0;
+    } catch (ex, st) {
+      Log.e("numChanges", ex: ex, stacktrace: st);
+    }
+    return null;
   }
 }
 
@@ -315,7 +315,7 @@ bool shouldLogGitException(Exception ex) {
   if (ex is! GitException) {
     return false;
   }
-  var msg = (ex as GitException).cause.toLowerCase();
+  var msg = ex.cause.toLowerCase();
   for (var i = 0; i < ignoredMessages.length; i++) {
     if (msg.contains(ignoredMessages[i])) {
       return false;

lib/core/graph.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'dart:async';
 import 'dart:math';
 
@@ -19,11 +17,11 @@ class Node {
   double forceX = 0.0;
   double forceY = 0.0;
 
-  String _label;
+  String? _label;
 
   Node(this.note);
 
-  String get label {
+  String? get label {
     _label ??= note.pathSpec();
     return _label;
   }
@@ -43,10 +41,10 @@ class Graph extends ChangeNotifier {
   List<Node> nodes = [];
   List<Edge> edges = [];
 
-  Map<String, Set<int>> _neighbours = {};
-  Map<String, int> _nodeIndexes;
+  Map<String?, Set<int?>> _neighbours = {};
+  Map<String?, int>? _nodeIndexes;
 
-  GraphNodeLayout initLayouter;
+  late GraphNodeLayout initLayouter;
 
   final double nodeSize = 50.0;
 
@@ -78,6 +76,9 @@ class Graph extends ChangeNotifier {
     var node = _getNode(note);
 
     var links = await node.note.fetchLinks();
+    if (links == null) {
+      return;
+    }
     var linkResolver = LinkResolver(note);
     for (var l in links) {
       var noteB = linkResolver.resolveLink(l);
@@ -110,12 +111,12 @@ class Graph extends ChangeNotifier {
     startLayout();
   }
 
-  List<int> computeNeighbours(Node n) {
+  List<int?> computeNeighbours(Node n) {
     if (_nodeIndexes == null) {
-      _nodeIndexes = <String, int>{};
+      _nodeIndexes = <String?, int>{};
       for (var i = 0; i < this.nodes.length; i++) {
         var node = this.nodes[i];
-        _nodeIndexes[node.label] = i;
+        _nodeIndexes![node.label] = i;
       }
     }
 
@@ -124,15 +125,15 @@ class Graph extends ChangeNotifier {
       return _nodes.union(computeOverlappingNodes(n)).toList();
     }
 
-    var nodes = <int>{};
+    var nodes = <int?>{};
     for (var edge in edges) {
       if (edge.a.label == n.label) {
-        nodes.add(_nodeIndexes[edge.b.label]);
+        nodes.add(_nodeIndexes![edge.b.label]);
         continue;
       }
 
       if (edge.b.label == n.label) {
-        nodes.add(_nodeIndexes[edge.a.label]);
+        nodes.add(_nodeIndexes![edge.a.label]);
         continue;
       }
     }
@@ -164,7 +165,7 @@ class Graph extends ChangeNotifier {
     return _nodes;
   }
 
-  Timer layoutTimer;
+  Timer? layoutTimer;
 
   void startLayout() {
     if (layoutTimer != null) {
@@ -191,7 +192,7 @@ class Graph extends ChangeNotifier {
 
   void stopLayout() {
     if (layoutTimer != null) {
-      layoutTimer.cancel();
+      layoutTimer!.cancel();
       layoutTimer = null;
     }
   }
@@ -210,7 +211,7 @@ class GraphNodeLayout {
   double gap = 70;
   double nodeSize = 50;
 
-  GraphNodeLayout({@required this.maxWidth, @required this.maxHeight}) {
+  GraphNodeLayout({required this.maxWidth, required this.maxHeight}) {
     x = startX;
     y = startY;
   }
@@ -288,7 +289,7 @@ bool _updateGraphPositions(Graph g) {
     var node1Neighbours = g.computeNeighbours(node1);
 
     for (var j = 0; j < node1Neighbours.length; j++) {
-      var i2 = node1Neighbours[j];
+      var i2 = node1Neighbours[j]!;
       var node2 = g.nodes[i2];
 
       if (i1 < i2) {

lib/core/processors/wiki_links_auto_add.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'package:gitjournal/core/note.dart';
 import 'package:gitjournal/core/notes_folder.dart';
 

lib/core/sorted_notes_folder.dart

@@ -1,9 +1,5 @@
-// @dart=2.9
-
 import 'dart:math';
 
-import 'package:flutter/material.dart';
-
 import 'package:gitjournal/core/sorting_mode.dart';
 import 'package:gitjournal/utils/logger.dart';
 import 'note.dart';
@@ -13,14 +9,14 @@ import 'notes_folder_notifier.dart';
 class SortedNotesFolder with NotesFolderNotifier implements NotesFolder {
   final NotesFolder folder;
 
-  SortingMode _sortingMode;
-  NoteSortingFunction _sortFunc;
+  late SortingMode _sortingMode;
+  late NoteSortingFunction _sortFunc;
 
   List<Note> _notes = [];
 
   SortedNotesFolder({
-    @required this.folder,
-    @required SortingMode sortingMode,
+    required this.folder,
+    required SortingMode sortingMode,
   }) {
     _sortingMode = sortingMode;
     _sortFunc = _sortingMode.sortingFunction();
@@ -155,7 +151,7 @@ class SortedNotesFolder with NotesFolderNotifier implements NotesFolder {
   SortingMode get sortingMode => _sortingMode;
 
   @override
-  NotesFolder get parent => folder.parent;
+  NotesFolder? get parent => folder.parent;
 
   @override
   String pathSpec() => folder.pathSpec();

test/processors/wiki_links_auto_add_test.dart

@@ -1,13 +1,16 @@
 import 'package:test/test.dart';
 
+import 'package:gitjournal/core/notes_folder_fs.dart';
 import 'package:gitjournal/core/processors/wiki_links_auto_add.dart';
+import 'package:gitjournal/settings.dart';
 
 void main() {
   test('Should process body', () {
     var body =
         "GitJournal is the best? And it works quite well with Foam, Foam and Obsidian.";
 
-    var p = WikiLinksAutoAddProcessor(null);
+    var folder = NotesFolderFS(null, '/', Settings(''));
+    var p = WikiLinksAutoAddProcessor(folder);
     var newBody = p.processBody(body, ['GitJournal', 'Foam', 'Obsidian']);
     var expectedBody =
         "[[GitJournal]] is the best? And it works quite well with [[Foam]], [[Foam]] and [[Obsidian]].";