threaded delta search: refine work allocation

diff --git a/builtin-diff.c b/builtin-diff.c
index b48121e6e21ddd29fbb725c813aa22d0bcee2ea2..f77352b40decdc4cf8d2db29102703cb1193b49c 100644 (file)
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -188,6 +188,30 @@ void add_head(struct rev_info *revs)
        add_pending_object(revs, obj, "HEAD");
 }
 
+static void refresh_index_quietly(void)
+{
+       struct lock_file *lock_file;
+       int fd;
+
+       lock_file = xcalloc(1, sizeof(struct lock_file));
+       fd = hold_locked_index(lock_file, 0);
+       if (fd < 0)
+               return;
+       discard_cache();
+       read_cache();
+       refresh_cache(REFRESH_QUIET|REFRESH_UNMERGED);
+       if (active_cache_changed) {
+               if (write_cache(fd, active_cache, active_nr) ||
+                   close(fd) ||
+                   commit_locked_index(lock_file))
+                       ; /*
+                          * silently ignore it -- we haven't mucked
+                          * with the real index.
+                          */
+       }
+       rollback_lock_file(lock_file);
+}
+
 int cmd_diff(int argc, const char **argv, const char *prefix)
 {
        int i;
@@ -222,6 +246,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
        prefix = setup_git_directory_gently(&nongit);
        git_config(git_diff_ui_config);
        init_revisions(&rev, prefix);
+       rev.diffopt.skip_stat_unmatch = !!diff_auto_refresh_index;
 
        if (!setup_diff_no_index(&rev, argc, argv, nongit, prefix))
                argc = 0;
@@ -235,6 +260,12 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
        rev.diffopt.allow_external = 1;
        rev.diffopt.recursive = 1;
 
+       /* If the user asked for our exit code then don't start a
+        * pager or we would end up reporting its exit code instead.
+        */
+       if (!rev.diffopt.exit_with_status)
+               setup_pager();
+
        /* Do we have --cached and not have a pending object, then
         * default to HEAD by hand.  Eek.
         */
@@ -338,5 +369,8 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                                             ent, ents);
        if (rev.diffopt.exit_with_status)
                result = rev.diffopt.has_changes;
+
+       if (1 < rev.diffopt.skip_stat_unmatch)
+               refresh_index_quietly();
        return result;
 }