More complete ref bindings

src/geef_records.hlr

@@ -1,3 +1,3 @@
--record(ref, {handle}).
+-record(ref, {handle, type}).
 -record(repo, {handle}).
 -record(odb, {handle}).

src/geef_ref.erl

@@ -1,17 +1,30 @@
 -module(geef_ref).
 
--export([resolve/1, target/1]).
+-export([lookup/2, resolve/1, target/1]).
 
 -include("geef_records.hlr").
 
+new(Handle) ->
+    Type = geef:reference_type(Handle),
+    #ref{handle=Handle, type=Type}.
+
+-spec lookup(term(), iolist()) -> term().
+lookup(#repo{handle=Handle}, Refname) ->
+    case geef:reference_lookup(Handle, Refname) of
+	{ok, Ref} ->
+	    {ok, new(Ref)};
+	Other ->
+	    Other
+    end.
+
 resolve(#ref{handle=Handle}) ->
     case geef:reference_resolve(Handle) of
 	{ok, Ref} ->
-	    {ok, #ref{handle=Handle}};
+	    {ok, new(Ref)};
 	Other ->
 	    Other
     end.
 
 -spec target(term()) -> binary().
-target(#ref{handle=Handle}) ->
+target(#ref{handle=Handle, type=oid}) ->
     geef:reference_target(Handle).

src/odb.erl

@@ -1,5 +0,0 @@
--module(odb, [Handle]).
--export([exists/1]).
-
-exists(Sha) ->
-    geef:odb_object_exists(Handle, Sha).