[PATCH] show-diff.c: adjust default format for the Linux kernel.

This patch adjusts the default output format of show-diff to match
the Linux kernel style, recommended in Documentation/SubmittingPatches.

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

diff --git a/show-diff.c b/show-diff.c
index 40bc187..32d2fce 100644 (file)
--- a/show-diff.c
+++ b/show-diff.c
@@ -5,7 +5,7 @@
  */
 #include "cache.h"
 
-static char *diff_cmd = "diff -L '%s' -u -N  - '%s'";
+static char *diff_cmd = "diff -L 'a/%s' -L 'b/%s' -p -u - '%s'";
 
 /* Help to copy the thing properly quoted for the shell safety.
  * any single quote is replaced with '\'', and the caller is
@@ -52,11 +52,12 @@ static void show_differences(char *name, char *label, void *old_contents,
        FILE *f;
        char *name_sq = sq_expand(name);
        char *label_sq = (name != label) ? sq_expand(label) : name_sq;
-       int cmd_size = strlen(name_sq) + strlen(label_sq) + strlen(diff_cmd);
+       int cmd_size = strlen(name_sq) +
+               strlen(label_sq) * 2 + strlen(diff_cmd);
        char *cmd = malloc(cmd_size);
 
        fflush(stdout);
-       snprintf(cmd, cmd_size, diff_cmd, label_sq, name_sq);
+       snprintf(cmd, cmd_size, diff_cmd, label_sq, label_sq, name_sq);
        f = popen(cmd, "w");
        if (old_size)
                fwrite(old_contents, old_size, 1, f);