get_ref_dir(): return early if directory cannot be read

diff --git a/diff.c b/diff.c
index b020c070cac15e7448178db67a480fc311f18ad9..22288b0106258e4f2c170f9e51dbf72f563179bd 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -3146,6 +3146,7 @@ void diff_setup(struct diff_options *options)
        options->rename_limit = -1;
        options->dirstat_permille = diff_dirstat_permille_default;
        options->context = 3;
+       DIFF_OPT_SET(options, RENAME_EMPTY);
 
        options->change = diff_change;
        options->add_remove = diff_addremove;
@@ -3516,6 +3517,10 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
        }
        else if (!strcmp(arg, "--no-renames"))
                options->detect_rename = 0;
+       else if (!strcmp(arg, "--rename-empty"))
+               DIFF_OPT_SET(options, RENAME_EMPTY);
+       else if (!strcmp(arg, "--no-rename-empty"))
+               DIFF_OPT_CLR(options, RENAME_EMPTY);
        else if (!strcmp(arg, "--relative"))
                DIFF_OPT_SET(options, RELATIVE_NAME);
        else if (!prefixcmp(arg, "--relative=")) {
@@ -4409,6 +4414,12 @@ void diff_flush(struct diff_options *options)
 
        if (output_format & DIFF_FORMAT_PATCH) {
                if (separator) {
+                       if (options->output_prefix) {
+                               struct strbuf *msg = NULL;
+                               msg = options->output_prefix(options,
+                                       options->output_prefix_data);
+                               fwrite(msg->buf, msg->len, 1, stdout);
+                       }
                        putc(options->line_termination, options->file);
                        if (options->stat_sep) {
                                /* attach patch instead of inline */