Have geef_odb:exists take an oid properly

c_src/repository.c

@@ -174,24 +174,21 @@ geef_repository_odb(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 ERL_NIF_TERM
 geef_odb_exists(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 {
-	char sha[MAXBUFLEN] = {0};
 	geef_odb *odb;
+	ErlNifBinary bin;
 	git_oid oid;
 	int exists;
 
 	if (!enif_get_resource(env, argv[0], geef_odb_type, (void **) &odb))
 		return enif_make_badarg(env);
 
-	if (enif_get_string(env, argv[1], sha, sizeof(sha), ERL_NIF_LATIN1) < 1)
+	if (!enif_inspect_binary(env, argv[1], &bin))
 		return enif_make_badarg(env);
 
-	git_oid_fromstr(&oid, sha);
+	git_oid_fromraw(&oid, bin.data);
 	exists = git_odb_exists(odb->odb, &oid);
 
-	if (exists)
-		return atoms.true;
-
-	return atoms.false;
+	return exists ? atoms.true : atoms.false;
 }
 
 ERL_NIF_TERM

src/geef_odb.erl

@@ -1,11 +1,18 @@
 -module(geef_odb).
+
+-ifdef(TEST).
+-include_lib("eunit/include/eunit.hrl").
+-endif.
+
 -export([exists/2, write/3]).
 
 -include("geef_records.hrl").
 
--spec exists(odb(), string()) -> boolean().
-exists(#odb{handle=Handle}, Sha) ->
-    geef:odb_object_exists(Handle, Sha).
+-spec exists(odb(), oid() | iolist()) -> boolean().
+exists(#odb{handle=Handle}, #oid{oid=Oid}) ->
+    geef:odb_object_exists(Handle, Oid);
+exists(Odb = #odb{}, Sha) ->
+    exists(Odb, geef_oid:parse(Sha)).
 
 -spec write(odb(), iolist(), atom()) -> {ok, oid()} | {error, term}.
 write(#odb{handle=Handle}, Contents, Type) ->
@@ -15,3 +22,13 @@ write(#odb{handle=Handle}, Contents, Type) ->
 	Other ->
 	    Other
     end.
+
+-ifdef(TEST).
+
+exists_test() ->
+    {ok, Repo} = geef_repo:open(".."),
+    {ok, Odb} = geef_repo:odb(Repo),
+    ?assert(exists(Odb, "80d5c15a040c93a4f98f4496a05ebf30cdd58650")),
+    ?assert(exists(Odb, geef_oid:parse("80d5c15a040c93a4f98f4496a05ebf30cdd58650"))).
+
+-endif.