[PATCH] Diffcore updates.

This moves the path selection logic from individual programs to a new
diffcore transformer (diff-tree still needs to have its own for
performance reasons).  Also the header printing code in diff-tree was
tweaked not to produce anything when pickaxe is in effect and there is
nothing interesting to report.  An interesting example is the following
in the GIT archive itself:

    $ git-whatchanged -p -C -S'or something in a real script'

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

1 files changed, 15 insertions, 7 deletions

diff --git a/diff.h b/diff.h
index 1fc8469cfc..cae6e14fc5 100644
--- a/diff.h
+++ b/diff.h
@@ -26,16 +26,24 @@ extern void diff_unmerge(const char *path);
 
 extern int diff_scoreopt_parse(const char *opt);
 
-#define DIFF_FORMAT_HUMAN   0
-#define DIFF_FORMAT_MACHINE 1
-#define DIFF_FORMAT_PATCH   2
-extern void diff_setup(int reverse, int diff_output_style);
+#define DIFF_FORMAT_HUMAN	0
+#define DIFF_FORMAT_MACHINE	1
+#define DIFF_FORMAT_PATCH	2
+#define DIFF_FORMAT_NO_OUTPUT	3
+extern void diff_setup(int reverse);
 
-extern void diff_detect_rename(int, int);
-extern void diff_pickaxe(const char *);
+#define DIFF_DETECT_RENAME	1
+#define DIFF_DETECT_COPY	2
+
+extern void diffcore_rename(int rename_copy, int minimum_score);
+
+extern void diffcore_prune(void);
+
+extern void diffcore_pickaxe(const char *needle);
+extern void diffcore_pathspec(const char **pathspec);
 
 extern int diff_queue_is_empty(void);
 
-extern void diff_flush(const char **, int);
+extern void diff_flush(int output_style);
 
 #endif /* DIFF_H */