[PATCH] Mode only changes from diff.

This fixes another bug.

 - Mode-only changes were pruned incorrectly from the output.
 - Added test to catch the above problem.
 - Normalize rename/copy similarity score in the diff-raw output
   to per-cent, no matter what scale we internally use.

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

diff-helper.c

@@ -4,6 +4,7 @@
 #include "cache.h"
 #include "strbuf.h"
 #include "diff.h"
+#include "diffcore.h" /* just for MAX_SCORE */
 
 static const char *pickaxe = NULL;
 static int line_termination = '\n';
@@ -77,6 +78,7 @@ int main(int ac, const char **av) {
 			if (status == 'R' || status == 'C') {
 				two_paths = 1;
 				sscanf(cp, "%d", &score);
+				score = score * MAX_SCORE / 100;
 				if (line_termination) {
 					cp = strchr(cp,
 						    inter_name_termination);

diff.c

@@ -517,7 +517,8 @@ static void diff_flush_raw(struct diff_filepair *p,
 	switch (p->status) {
 	case 'C': case 'R':
 		two_paths = 1;
-		sprintf(status, "%c%1d", p->status, p->score);
+		sprintf(status, "%c%03d", p->status,
+			(int)(0.5 + p->score * 100.0/MAX_SCORE));
 		break;
 	default:
 		two_paths = 0;
@@ -750,7 +751,8 @@ static void diff_resolve_rename_copy(void)
 			if (!p->status)
 				p->status = 'R';
 		}
-		else if (memcmp(p->one->sha1, p->two->sha1, 20))
+		else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
+			 p->one->mode != p->two->mode)
 			p->status = 'M';
 		else
 			/* this is a "no-change" entry */

t/t4006-diff-mode.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Test mode change diffs.
+
+'
+. ./test-lib.sh
+
+test_expect_success \
+    'setup' \
+    'echo frotz >rezrov &&
+     git-update-cache --add rezrov &&
+     tree=`git-write-tree` &&
+     echo $tree'
+
+test_expect_success \
+    'chmod' \
+    'chmod +x rezrov &&
+     git-update-cache rezrov &&
+     git-diff-cache $tree >current'
+
+_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
+_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
+sed -e 's/\(:100644 100755\) \('"$_x40"'\) \2 /\1 X X /' <current >check
+echo ":100644 100755 X X M	rezrov" >expected
+
+test_expect_success \
+    'verify' \
+    'diff -u expected check'
+
+test_done
+