abbrev cleanup: use symbolic constants

The minimum length of abbreviated object name was hardcoded in
different places to be 4, risking inconsistencies in the future.
Also there were three different "default abbreviation
precision".  Use two C preprocessor symbols to clean up this
mess.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 0 insertions, 3 deletions

diff --git a/diff.h b/diff.h
index 5696f2aff0..122c8143a3 100644
--- a/diff.h
+++ b/diff.h
@@ -88,9 +88,6 @@ extern int diff_setup_done(struct diff_options *);
 
 #define DIFF_PICKAXE_ALL	1
 
-#define DIFF_DEFAULT_INDEX_ABBREV	7 /* hex digits */
-#define DIFF_DEFAULT_ABBREV	7 /* hex digits */
-
 extern void diffcore_std(struct diff_options *);
 
 extern void diffcore_std_no_resolve(struct diff_options *);