[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, 7 insertions, 1 deletions

diff --git a/diff-tree.c b/diff-tree.c
index c33f54a..ec2c078 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -15,6 +15,7 @@ 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 const char *header = NULL;
 static const char *header_prefix = "";
 
@@ -265,7 +266,8 @@ static int call_diff_flush(void)
 	diffcore_std(0,
 		     detect_rename, diff_score_opt,
 		     pickaxe, pickaxe_opts,
-		     diff_break_opt);
+		     diff_break_opt,
+		     orderfile);
 	if (diff_queue_is_empty()) {
 		diff_flush(DIFF_FORMAT_NO_OUTPUT, 0);
 		return 0;
@@ -511,6 +513,10 @@ int main(int argc, const char **argv)
 			pickaxe = arg + 2;
 			continue;
 		}
+		if (!strncmp(arg, "-O", 2)) {
+			orderfile = arg + 2;
+			continue;
+		}
 		if (!strcmp(arg, "--pickaxe-all")) {
 			pickaxe_opts = DIFF_PICKAXE_ALL;
 			continue;