Add a few basic functions for the repository

src/geef.erl

@@ -1,5 +1,5 @@
 -module(geef).
--export([start/0, hex_to_raw/1, object_exists/2]).
+-export([start/0, hex_to_raw/1, object_exists/2, repository/1, repository_path/1]).
 -on_load(start/0).
 
 start() ->
@@ -18,5 +18,18 @@ hex_to_raw(_Val) ->
 object_exists(_Val, _Val2) ->
     nif_error(?LINE).
 
+repository_open(_Val) ->
+    nif_error(?LINE).
+
+repository_get_path(_Val) ->
+    nif_error(?LINE).
+
+repository_path({repository, Handle}) ->
+    repository_get_path(Handle).
+
+repository(Path) ->
+    {ok, Repository} = repository_open(Path),
+    {repository, Repository}.
+
 nif_error(Line) ->
     exit({nif_not_loaded,module,?MODULE,line,Line}).