feat(repository): add alias for commit creation

lib/src/bindings/commit.dart

@@ -73,19 +73,21 @@ void annotatedFree(Pointer<git_annotated_commit> commit) {
 /// Throws a [LibGit2Error] if error occured.
 Pointer<git_oid> create(
   Pointer<git_repository> repo,
-  String? updateRef,
+  String updateRef,
   Pointer<git_signature> author,
   Pointer<git_signature> committer,
-  String? messageEncoding,
+  String messageEncoding,
   String message,
   Pointer<git_tree> tree,
   int parentCount,
   List<String> parents,
 ) {
   final out = calloc<git_oid>();
-  final updateRefC = updateRef?.toNativeUtf8().cast<Int8>() ?? nullptr;
-  final messageEncodingC =
-      messageEncoding?.toNativeUtf8().cast<Int8>() ?? nullptr;
+  final updateRefC =
+      updateRef.isEmpty ? nullptr : updateRef.toNativeUtf8().cast<Int8>();
+  final messageEncodingC = messageEncoding.isEmpty
+      ? nullptr
+      : messageEncoding.toNativeUtf8().cast<Int8>();
   final messageC = message.toNativeUtf8().cast<Int8>();
   Pointer<Pointer<git_commit>> parentsC =
       calloc.call<Pointer<git_commit>>(parentCount);

lib/src/commit.dart

@@ -33,6 +33,12 @@ class Commit {
 
   /// Creates new commit in the repository.
   ///
+  /// [updateRef] is name of the reference that will be updated to point to this commit.
+  /// If the reference is not direct, it will be resolved to a direct reference. Use "HEAD"
+  /// to update the HEAD of the current branch and make it point to this commit. If the
+  /// reference doesn't exist yet, it will be created. If it does exist, the first parent
+  /// must be the tip of this branch.
+  ///
   /// Throws a [LibGit2Error] if error occured.
   static Oid create({
     required Repository repo,
@@ -41,8 +47,8 @@ class Commit {
     required Signature commiter,
     required String treeSHA,
     required List<String> parents,
-    String? updateRef,
-    String? messageEncoding,
+    String updateRef = '',
+    String messageEncoding = '',
   }) {
     final tree = Tree.lookup(repo, treeSHA);
 

lib/src/repository.dart

@@ -394,6 +394,34 @@ class Repository {
   /// Throws a [LibGit2Error] if error occured.
   Commit revParseSingle(String spec) => RevParse.single(this, spec);
 
+  /// Creates new commit in the repository.
+  ///
+  /// [updateRef] is name of the reference that will be updated to point to this commit.
+  /// If the reference is not direct, it will be resolved to a direct reference. Use "HEAD"
+  /// to update the HEAD of the current branch and make it point to this commit. If the
+  /// reference doesn't exist yet, it will be created. If it does exist, the first parent
+  /// must be the tip of this branch.
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  Oid createCommit({
+    required String message,
+    required Signature author,
+    required Signature commiter,
+    required String treeSHA,
+    required List<String> parents,
+    String updateRef = '',
+    String messageEncoding = '',
+  }) {
+    return Commit.create(
+      repo: this,
+      message: message,
+      author: author,
+      commiter: commiter,
+      treeSHA: treeSHA,
+      parents: parents,
+    );
+  }
+
   /// Finds a single object and intermediate reference (if there is one) by a [spec] revision string.
   ///
   /// See `man gitrevisions`, or https://git-scm.com/docs/git-rev-parse.html#_specifying_revisions