feat(repository): add ability to set and get namespace

lib/src/bindings/repository.dart

@@ -70,6 +70,24 @@ String getNamespace(Pointer<git_repository> repo) {
   }
 }
 
+/// Sets the active namespace for this repository.
+///
+/// This namespace affects all reference operations for the repo. See `man gitnamespaces`
+///
+/// The [namespace] should not include the refs folder, e.g. to namespace all references
+/// under refs/namespaces/foo/, use foo as the namespace.
+///
+/// Throws a [LibGit2Error] if error occured.
+void setNamespace(Pointer<git_repository> repo, String? namespace) {
+  final nmspace = namespace?.toNativeUtf8().cast<Int8>() ?? nullptr;
+  final error = libgit2.git_repository_set_namespace(repo, nmspace);
+  calloc.free(nmspace);
+
+  if (error < 0) {
+    throw LibGit2Error(libgit2.git_error_last());
+  }
+}
+
 /// Check if a repository is bare or not.
 bool isBare(Pointer<git_repository> repo) {
   final result = libgit2.git_repository_is_bare(repo);
@@ -331,24 +349,6 @@ void setHeadDetachedFromAnnotated(
   }
 }
 
-/// Sets the active namespace for this Git Repository
-///
-/// This namespace affects all reference operations for the repo. See `man gitnamespaces`
-///
-/// The [namespace] should not include the refs folder, e.g. to namespace all references
-/// under refs/namespaces/foo/, use foo as the namespace.
-///
-/// Throws a [LibGit2Error] if error occured.
-void setNamespace(Pointer<git_repository> repo, String namespace) {
-  final nmspace = namespace.toNativeUtf8().cast<Int8>();
-  final error = libgit2.git_repository_set_namespace(repo, nmspace);
-  calloc.free(nmspace);
-
-  if (error < 0) {
-    throw LibGit2Error(libgit2.git_error_last());
-  }
-}
-
 /// Set the path to the working directory for this repository
 ///
 /// The working directory doesn't need to be the same one that contains the

lib/src/repository.dart

@@ -44,6 +44,24 @@ class Repository {
   /// empty string is returned.
   String getNamespace() => bindings.getNamespace(_repoPointer);
 
+  /// Sets the active namespace for this repository.
+  ///
+  /// This namespace affects all reference operations for the repo. See `man gitnamespaces`
+  ///
+  /// The [namespace] should not include the refs folder, e.g. to namespace all references
+  /// under refs/namespaces/foo/, use foo as the namespace.
+  ///
+  /// Pass null to unset.
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  void setNamespace(String? namespace) {
+    try {
+      bindings.setNamespace(_repoPointer, namespace);
+    } catch (e) {
+      rethrow;
+    }
+  }
+
   /// Checks whether this repository is a bare repository or not.
   bool isBare() => bindings.isBare(_repoPointer);
 
@@ -85,7 +103,7 @@ class Repository {
   /// Sets the identity to be used for writing reflogs.
   ///
   /// If both are set, this name and email will be used to write to the reflog.
-  /// Pass NULL to unset. When unset, the identity will be taken from the repository's configuration.
+  /// Pass null to unset. When unset, the identity will be taken from the repository's configuration.
   void setIdentity({required String? name, required String? email}) {
     bindings.setIdentity(_repoPointer, name, email);
   }

test/repository_test.dart

@@ -83,6 +83,14 @@ void main() {
       });
 
       test('returns empty string when there is no namespace', () {
+        expect(repo.getNamespace(), isEmpty);
+      });
+
+      test('successfully sets and unsets the namespace', () {
+        expect(repo.getNamespace(), '');
+        repo.setNamespace('some');
+        expect(repo.getNamespace(), 'some');
+        repo.setNamespace(null);
         expect(repo.getNamespace(), '');
       });