feat(revwalk): add bindings and api

test/repository_test.dart

@@ -179,6 +179,26 @@ void main() {
         config.free();
       });
 
+      test('returns list of commits by walking from provided starting oid', () {
+        const log = [
+          '78b8bf123e3952c970ae5c1ce0a3ea1d1336f6e8',
+          'c68ff54aabf660fcdd9a2838d401583fe31249e3',
+          'fc38877b2552ab554752d9a77e1f48f738cca79b',
+          '6cbc22e509d72758ab4c8d9f287ea846b90c448b',
+          'f17d0d48eae3aa08cecf29128a35e310c97b3521',
+        ];
+        final start = Oid.fromSHA(repo, lastCommit);
+        final commits = repo.log(start);
+
+        for (var i = 0; i < commits.length; i++) {
+          expect(commits[i].id.sha, log[i]);
+        }
+
+        for (var c in commits) {
+          c.free();
+        }
+      });
+
       group('.discover()', () {
         test('discovers repository', () async {
           final subDir = '${tmpDir}subdir1/subdir2/';

test/revwalk_test.dart

@@ -0,0 +1,144 @@
+import 'dart:io';
+
+import 'package:test/test.dart';
+import 'package:libgit2dart/libgit2dart.dart';
+import 'helpers/util.dart';
+
+void main() {
+  const log = [
+    '78b8bf123e3952c970ae5c1ce0a3ea1d1336f6e8',
+    'c68ff54aabf660fcdd9a2838d401583fe31249e3',
+    'fc38877b2552ab554752d9a77e1f48f738cca79b',
+    '6cbc22e509d72758ab4c8d9f287ea846b90c448b',
+    'f17d0d48eae3aa08cecf29128a35e310c97b3521',
+  ];
+  late Repository repo;
+  final tmpDir = '${Directory.systemTemp.path}/revwalk_testrepo/';
+
+  setUp(() async {
+    if (await Directory(tmpDir).exists()) {
+      await Directory(tmpDir).delete(recursive: true);
+    }
+    await copyRepo(
+      from: Directory('test/assets/testrepo/'),
+      to: await Directory(tmpDir).create(),
+    );
+    repo = Repository.open(tmpDir);
+  });
+
+  tearDown(() async {
+    repo.free();
+    await Directory(tmpDir).delete(recursive: true);
+  });
+  group('RevWalk', () {
+    test('returns list of commits with default sorting', () {
+      final walker = RevWalk(repo);
+      final start = Oid.fromSHA(repo, log.first);
+
+      walker.push(start);
+      final commits = walker.walk();
+
+      for (var i = 0; i < commits.length; i++) {
+        expect(commits[i].id.sha, log[i]);
+      }
+
+      for (var c in commits) {
+        c.free();
+      }
+      walker.free();
+    });
+
+    test('returns list of commits with reverse sorting', () {
+      final walker = RevWalk(repo);
+      final start = Oid.fromSHA(repo, log.first);
+
+      walker.push(start);
+      walker.sorting(GitSort.reverse);
+      final commits = walker.walk();
+
+      for (var i = 0; i < commits.length; i++) {
+        expect(commits[i].id.sha, log.reversed.toList()[i]);
+      }
+
+      for (var c in commits) {
+        c.free();
+      }
+      walker.free();
+    });
+
+    test('successfully changes sorting', () {
+      final walker = RevWalk(repo);
+      final start = Oid.fromSHA(repo, log.first);
+
+      walker.push(start);
+      final timeSortedCommits = walker.walk();
+
+      for (var i = 0; i < timeSortedCommits.length; i++) {
+        expect(timeSortedCommits[i].id.sha, log[i]);
+      }
+
+      walker.sorting(GitSort.reverse);
+      final reverseSortedCommits = walker.walk();
+      for (var i = 0; i < reverseSortedCommits.length; i++) {
+        expect(reverseSortedCommits[i].id.sha, log.reversed.toList()[i]);
+      }
+
+      for (var c in timeSortedCommits) {
+        c.free();
+      }
+      for (var c in reverseSortedCommits) {
+        c.free();
+      }
+      walker.free();
+    });
+
+    test('successfully hides commit and its ancestors', () {
+      final walker = RevWalk(repo);
+      final start = Oid.fromSHA(repo, log.first);
+      final oidToHide = Oid.fromSHA(repo, log[2]);
+
+      walker.push(start);
+      walker.hide(oidToHide);
+      final commits = walker.walk();
+
+      expect(commits.length, 2);
+
+      for (var c in commits) {
+        c.free();
+      }
+      walker.free();
+    });
+
+    test('successfully resets walker', () {
+      final walker = RevWalk(repo);
+      final start = Oid.fromSHA(repo, log.first);
+
+      walker.push(start);
+      walker.reset();
+      final commits = walker.walk();
+
+      expect(commits, []);
+
+      walker.free();
+    });
+
+    test('simplifies walker by enqueuing only first parent for each commit',
+        () {
+      final walker = RevWalk(repo);
+      final start = Oid.fromSHA(repo, log.first);
+
+      walker.push(start);
+      walker.simplifyFirstParent();
+      final commits = walker.walk();
+
+      for (var i = 0; i < commits.length; i++) {
+        expect(commits.length, 3);
+      }
+
+      for (var c in commits) {
+        c.free();
+      }
+      walker.free();
+    });
+  });
+}