Teach revision walking machinery to walk multiple times sequencially

Previously it was not possible to iterate revisions twice using the
revision walking api. We add a reset_revision_walk() which clears the
used flags. This allows us to do multiple sequencial revision walks.

We add the appropriate calls to the existing submodule machinery doing
revision walks. This is done to avoid surprises if future code wants to
call these functions more than once during the processes lifetime.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/object.h b/object.h
index b6618d92b..6a97b6ba1 100644
--- a/object.h
+++ b/object.h
@@ -76,4 +76,6 @@ void add_object_array(struct object *obj, const char *name, struct object_array
 void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode);
 void object_array_remove_duplicates(struct object_array *);
 
+void clear_object_flags(unsigned flags);
+
 #endif /* OBJECT_H */