[PATCH 1/7] for_each_*_object: store flag definitions in a single location

[Jeff King <peff@peff.net>]

These flags were split between cache.h and packfile.h,
because some of the flags apply only to packs. However, they
share a single numeric namespace, since both are respected
for the packed variant. Let's make sure they're defined
together so that nobody accidentally adds a new flag in one
location that duplicates the other.

While we're here, let's also put them in an enum (which
helps debugger visibility) and use "(1<<n)" rather than
counting powers of 2 manually.

Signed-off-by: Jeff King <peff@peff.net>
---
Arguably, all of these for_each_*_object() functions should stay
together. Even though some are related to packfiles and some to loose,
they are meant to be a unified API. So I'd be fine to do that on top,
but this at least reduces the chance of a mistake in the meantime.

 cache.h    | 13 ++++++++++++-
 packfile.h |  8 ++------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/cache.h b/cache.h
index 8dc7134f00..4187238ecf 100644
--- a/cache.h
+++ b/cache.h
@@ -1623,12 +1623,23 @@ int for_each_loose_file_in_objdir_buf(struct strbuf *path,
 				      each_loose_subdir_fn subdir_cb,
 				      void *data);
 
+/*
+ * Flags for for_each_*_object(), including for_each_loose below and
+ * for_each_packed in packfile.h.
+ */
+enum for_each_object_flags {
+	/* Iterate only over local objects, not alternates. */
+	FOR_EACH_OBJECT_LOCAL_ONLY = (1<<0),
+
+	/* Only iterate over packs obtained from the promisor remote. */
+	FOR_EACH_OBJECT_PROMISOR_ONLY = (1<<1),
+};
+
 /*
  * Iterate over loose objects in both the local
  * repository and any alternates repositories (unless the
  * LOCAL_ONLY flag is set).
  */
-#define FOR_EACH_OBJECT_LOCAL_ONLY 0x1
 extern int for_each_loose_object(each_loose_object_fn, void *, unsigned flags);
 
 /*
diff --git a/packfile.h b/packfile.h
index cc7eaffe1b..6ddc6a2e91 100644
--- a/packfile.h
+++ b/packfile.h
@@ -148,15 +148,11 @@ extern int has_object_pack(const struct object_id *oid);
 
 extern int has_pack_index(const unsigned char *sha1);
 
-/*
- * Only iterate over packs obtained from the promisor remote.
- */
-#define FOR_EACH_OBJECT_PROMISOR_ONLY 2
-
 /*
  * Iterate over packed objects in both the local
  * repository and any alternates repositories (unless the
- * FOR_EACH_OBJECT_LOCAL_ONLY flag, defined in cache.h, is set).
+ * FOR_EACH_OBJECT_LOCAL_ONLY flag is set). See cache.h for the complete list
+ * of flags.
  */
 typedef int each_packed_object_fn(const struct object_id *oid,
 				  struct packed_git *pack,
-- 
2.18.0.1058.g7433f71063