feat: prototype repository api

lib/src/repository.dart

@@ -0,0 +1,40 @@
+import 'dart:ffi';
+import 'package:ffi/ffi.dart';
+import 'bindings/libgit2_bindings.dart';
+import 'bindings/repository.dart' as repository;
+import 'util.dart';
+
+/// A Repository is the primary interface into a git repository
+class Repository {
+  Repository();
+
+  /// Initializes a new instance of the [Repository] class.
+  /// For a standard repository, [dir] should either point to the `.git` folder
+  /// or to the working directory. For a bare repository, [dir] should directly
+  /// point to the repository folder.
+  Repository.open(String dir) {
+    libgit2.git_libgit2_init();
+
+    _repoPointer = repository.open(dir);
+    _head = repository.revParseSingle(_repoPointer.value, 'HEAD^{commit}');
+    headCommit = libgit2
+        .git_commit_message(_head.value.cast<git_commit>())
+        .cast<Utf8>()
+        .toDartString();
+    path = repository.path(_repoPointer.value);
+    namespace = repository.getNamespace(_repoPointer.value);
+    isBare = repository.isBare(_repoPointer.value);
+
+    // free up neccessary pointers
+    calloc.free(_repoPointer);
+    calloc.free(_head);
+    libgit2.git_libgit2_shutdown();
+  }
+
+  late Pointer<Pointer<git_repository>> _repoPointer;
+  late Pointer<Pointer<git_object>> _head;
+  late String headCommit;
+  late String path;
+  late String namespace;
+  late bool isBare;
+}