refactor commit parent assignment with graft

src/libgit2/commit.c

@@ -499,6 +499,22 @@ int git_commit__parse_raw(void *commit, const char *data, size_t size)
 	return commit_parse(commit, data, size, 0);
 }
 
+static int assign_parents_from_graft(git_commit *commit, git_commit_graft *graft) {
+	size_t idx;
+	git_oid *oid;
+
+	git_array_clear(commit->parent_ids);
+	git_array_init_to_size(commit->parent_ids, git_array_size(graft->parents));
+	git_array_foreach(graft->parents, idx, oid) {
+		git_oid *id = git_array_alloc(commit->parent_ids);
+		GIT_ERROR_CHECK_ALLOC(id);
+
+		git_oid_cpy(id, oid);
+	}
+
+	return 0;
+}
+
 int git_commit__parse_ext(git_commit *commit, git_odb_object *odb_obj, unsigned int flags)
 {
 	git_repository *repo = git_object_owner((git_object *)commit);
@@ -513,21 +529,11 @@ int git_commit__parse_ext(git_commit *commit, git_odb_object *odb_obj, unsigned
 		return 0;
 
 	/* Perform necessary grafts */
-	if (git_grafts_get(&graft, repo->grafts, git_odb_object_id(odb_obj)) == 0 ||
-		git_grafts_get(&graft, repo->shallow_grafts, git_odb_object_id(odb_obj)) == 0) {
-		size_t idx;
-		git_oid *oid;
-		git_array_clear(commit->parent_ids);
-		git_array_init_to_size(commit->parent_ids, git_array_size(graft->parents));
-		git_array_foreach(graft->parents, idx, oid) {
-			git_oid *id = git_array_alloc(commit->parent_ids);
-			GIT_ERROR_CHECK_ALLOC(id);
-
-			git_oid_cpy(id, oid);
-		}
-	}
-	
-	return 0;
+	if (git_grafts_get(&graft, repo->grafts, git_odb_object_id(odb_obj)) != 0 &&
+		git_grafts_get(&graft, repo->shallow_grafts, git_odb_object_id(odb_obj)) != 0)
+		return 0;
+
+	return assign_parents_from_graft(commit, graft);
 }
 
 int git_commit__parse(void *_commit, git_odb_object *odb_obj)