[PATCH] diff: consolidate various calls into diffcore.

The three diff-* brothers had a sequence of calls into diffcore
that were almost identical.  Introduce a new diffcore_std()
function that takes all the necessary arguments to consolidate
it.  This will make later enhancements and changing the order of
diffcore application simpler.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff.h

@@ -43,6 +43,10 @@ extern void diffcore_pickaxe(const char *needle, int opts);
 
 extern void diffcore_pathspec(const char **pathspec);
 
+extern void diffcore_std(const char **paths,
+			 int detect_rename, int rename_score,
+			 const char *pickaxe, int pickaxe_opts);
+
 extern int diff_queue_is_empty(void);
 
 #define DIFF_FORMAT_HUMAN	0