[PATCH] Silent flag for show-diff

This patch adds a -s flag for show-diff, which will surpress the
actual diffing. This is useful for my scripts when they just want
to see what needs to be updated in the cache.

Signed-off-by: Petr Baudis <pasky@ucw.cz>

diff --git a/show-diff.c b/show-diff.c
index 9f82c05..bc3791a 100644 (file)
--- a/show-diff.c
+++ b/show-diff.c
@@ -57,9 +57,18 @@ static void show_diff_empty(struct cache_entry *ce)
 
 int main(int argc, char **argv)
 {
+       int silent = 0;
        int entries = read_cache();
        int i;
 
+       while (argc-- > 1) {
+               if (!strcmp(argv[1], "-s")) {
+                       silent = 1;
+                       continue;
+               }
+               usage("show-diff [-s]");
+       }
+
        if (entries < 0) {
                perror("read_cache");
                exit(1);
@@ -74,7 +83,7 @@ int main(int argc, char **argv)
 
                if (stat(ce->name, &st) < 0) {
                        printf("%s: %s\n", ce->name, strerror(errno));
-                       if (errno ==  ENOENT)
+                       if (errno == ENOENT && !silent)
                                show_diff_empty(ce);
                        continue;
                }
@@ -86,6 +95,9 @@ int main(int argc, char **argv)
                        printf("%02x", ce->sha1[n]);
                printf("\n");
                fflush(stdout);
+               if (silent)
+                       continue;
+
                new = read_sha1_file(ce->sha1, type, &size);
                show_differences(ce->name, new, size);
                free(new);