object-store: move lookup_replace_object to replace-object.h

lookup_replace_object is a low-level function that most users of the
object store do not need to use directly.

Move it to replace-object.h to avoid a dependency loop in an upcoming
change to its inline definition that will make use of repository.h.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/replace-object.h b/replace-object.h
index f9a2b70eb8..15315311fb 100644
--- a/replace-object.h
+++ b/replace-object.h
@@ -1,9 +1,31 @@
 #ifndef REPLACE_OBJECT_H
 #define REPLACE_OBJECT_H
 
+#include "oidmap.h"
+#include "repository.h"
+
 struct replace_object {
 	struct oidmap_entry original;
 	struct object_id replacement;
 };
 
+/*
+ * This internal function is only declared here for the benefit of
+ * lookup_replace_object().  Please do not call it directly.
+ */
+extern const struct object_id *do_lookup_replace_object(const struct object_id *oid);
+
+/*
+ * If object sha1 should be replaced, return the replacement object's
+ * name (replaced recursively, if necessary).  The return value is
+ * either sha1 or a pointer to a permanently-allocated value.  When
+ * object replacement is suppressed, always return sha1.
+ */
+static inline const struct object_id *lookup_replace_object(const struct object_id *oid)
+{
+	if (!check_replace_refs)
+		return oid;
+	return do_lookup_replace_object(oid);
+}
+
 #endif /* REPLACE_OBJECT_H */