Allow getting a tree entry

c_src/object.h

@@ -3,15 +3,19 @@
 
 #include "erl_nif.h"
 #include <git2.h>
+#include "repository.h"
 
 extern ErlNifResourceType *geef_object_type;
 
 typedef struct {
-    git_object *obj;
+	git_object *obj;
+	geef_repository *repo;
 } geef_object;
 
 ERL_NIF_TERM geef_object_lookup(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
 
+ERL_NIF_TERM geef_object_type2atom(const git_otype type);
+
 void geef_object_free(ErlNifEnv *env, void *cd);
 
 #endif