rebase -i: use struct object_id for squash_onto

More preparation for using `struct rebase_options` in
cmd_rebase__interactive(). Using a string was a hangover from the
scripted version of rebase, update the functions that use `squash_onto`
to take a `sturct object_id`.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/parse-options-cb.c b/parse-options-cb.c
index 2206eb7..28ad5cd 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -129,6 +129,23 @@ int parse_opt_object_name(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
+int parse_opt_object_id(const struct option *opt, const char *arg, int unset)
+{
+	struct object_id oid;
+	struct object_id *target = opt->value;
+
+	if (unset) {
+		*target = null_oid;
+		return 0;
+	}
+	if (!arg)
+		return -1;
+	if (get_oid(arg, &oid))
+		return error(_("malformed object name '%s'"), arg);
+	*target = oid;
+	return 0;
+}
+
 int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 {
 	int *target = opt->value;