[PATCH] Add -O<orderfile> option to diff-* brothers.

A new diffcore filter diffcore-order is introduced.  This takes
a text file each of whose line is a shell glob pattern.  Patches
that match a glob pattern on an earlier line in the file are
output before patches that match a later line, and patches that
do not match any glob pattern are output last.

A typical orderfile for git project probably should look like
this:

    README
    Makefile
    Documentation
    *.h
    *.c

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

1 files changed, 5 insertions, 1 deletions

diff --git a/diff-files.c b/diff-files.c
index b840b35d1..f3a79e5c0 100644
--- a/diff-files.c
+++ b/diff-files.c
@@ -16,6 +16,7 @@ static int diff_score_opt = 0;
 static const char *pickaxe = NULL;
 static int pickaxe_opts = 0;
 static int diff_break_opt = -1;
+static const char *orderfile = NULL;
 static int silent = 0;
 
 static void show_unmerge(const char *path)
@@ -56,6 +57,8 @@ int main(int argc, const char **argv)
 			diff_setup_opt |= DIFF_SETUP_REVERSE;
 		else if (!strncmp(argv[1], "-S", 2))
 			pickaxe = argv[1] + 2;
+		else if (!strncmp(argv[1], "-O", 2))
+			orderfile = argv[1] + 2;
 		else if (!strcmp(argv[1], "--pickaxe-all"))
 			pickaxe_opts = DIFF_PICKAXE_ALL;
 		else if (!strncmp(argv[1], "-B", 2))
@@ -122,7 +125,8 @@ int main(int argc, const char **argv)
 	diffcore_std((1 < argc) ? argv + 1 : NULL,
 		     detect_rename, diff_score_opt,
 		     pickaxe, pickaxe_opts,
-		     diff_break_opt);
+		     diff_break_opt,
+		     orderfile);
 	diff_flush(diff_output_format, 1);
 	return 0;
 }