Add geef_commit:tree_id

c_src/commit.c

@@ -0,0 +1,24 @@
+#include "geef.h"
+#include "repository.h"
+#include "object.h"
+#include "oid.h"
+#include <string.h>
+#include <git2.h>
+
+ERL_NIF_TERM
+geef_commit_tree_id(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
+{
+	const git_oid *id;
+	geef_object *obj;
+	ErlNifBinary bin;
+
+	if (!enif_get_resource(env, argv[0], geef_object_type, (void **) &obj))
+		return enif_make_badarg(env);
+
+	id = git_commit_tree_id((git_commit *) obj->obj);
+
+	if (geef_oid_bin(&bin, id) < 0)
+		return atoms.error;
+
+	return enif_make_binary(env, &bin);
+}

c_src/commit.h

@@ -0,0 +1,6 @@
+#ifndef GEEF_COMMIT_H
+#define GEEF_COMMIT_H
+
+ERL_NIF_TERM geef_commit_tree_id(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
+
+#endif

c_src/geef.c

@@ -3,6 +3,7 @@
 #include "reference.h"
 #include "oid.h"
 #include "object.h"
+#include "commit.h"
 #include "geef.h"
 #include <stdio.h>
 #include <string.h>
@@ -97,6 +98,7 @@ static ErlNifFunc geef_funcs[] =
 	{"oid_fmt", 1, geef_oid_fmt},
 	{"oid_parse", 1, geef_oid_parse},
 	{"object_lookup", 2, geef_object_lookup},
+	{"commit_tree_id", 1, geef_commit_tree_id},
 };
 
 ERL_NIF_INIT(geef, geef_funcs, load, NULL, NULL, unload)