Add object id lookup

c_src/geef.c

@@ -98,6 +98,7 @@ static ErlNifFunc geef_funcs[] =
 	{"oid_fmt", 1, geef_oid_fmt},
 	{"oid_parse", 1, geef_oid_parse},
 	{"object_lookup", 2, geef_object_lookup},
+	{"object_id", 1, geef_object_id},
 	{"commit_tree", 1, geef_commit_tree},
 	{"commit_tree_id", 1, geef_commit_tree_id},
 	{"tree_bypath", 2, geef_tree_bypath},

c_src/object.c

@@ -63,3 +63,21 @@ geef_object_lookup(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 
 	return enif_make_tuple3(env, atoms.ok, geef_object_type2atom(git_object_type(obj->obj)), term_obj);
 }
+
+ERL_NIF_TERM
+geef_object_id(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
+{
+	ErlNifBinary bin;
+	const git_oid *id;
+	geef_object *obj;
+
+	if (!enif_get_resource(env, argv[0], geef_object_type, (void **) &obj))
+		return enif_make_badarg(env);
+
+	id = git_object_id(obj->obj);
+
+	if (geef_oid_bin(&bin, id) < 0)
+		return atoms.error;
+
+	return enif_make_tuple2(env, atoms.ok, enif_make_binary(env, &bin));
+}

c_src/object.h

@@ -13,6 +13,7 @@ typedef struct {
 } geef_object;
 
 ERL_NIF_TERM geef_object_lookup(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM geef_object_id(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
 
 ERL_NIF_TERM geef_object_type2atom(const git_otype type);