Add oid_parse(Sha)

c_src/oid.c

@@ -1,7 +1,18 @@
 #include <git2.h>
+#include <string.h>
+
 #include "geef.h"
 #include "oid.h"
 
+int geef_oid_bin(ErlNifBinary *bin, const git_oid *id)
+{
+	if (!enif_alloc_binary(GIT_OID_RAWSZ, bin))
+		return -1;
+
+	memcpy(bin->data, id, GIT_OID_RAWSZ);
+	return 0;
+}
+
 ERL_NIF_TERM
 geef_oid_fmt(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 {
@@ -22,3 +33,20 @@ geef_oid_fmt(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 
 	return enif_make_binary(env, &bin_out);
 }
+
+ERL_NIF_TERM
+geef_oid_parse(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
+{
+	ErlNifBinary bin, bin_out;
+	git_oid id;
+
+	if (!enif_inspect_binary(env, argv[0], &bin))
+		return enif_make_badarg(env);
+
+	git_oid_fromstrn(&id, (const char *)bin.data, bin.size);
+
+	if (geef_oid_bin(&bin_out, &id) < 0)
+		return atoms.error;
+
+	return enif_make_binary(env, &bin_out);
+}