diff-lib: allow ita entries treated as "not yet exist in index"

diff --git a/parse-options-cb.c b/parse-options-cb.c
index 9667bc75a08e8b64290f5f44c92b0bac35d1d0fa..b5d920914e2a3ba3a46017f89f9952d08b8e5b58 100644 (file)
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -158,6 +158,18 @@ int parse_opt_noop_cb(const struct option *opt, const char *arg, int unset)
        return 0;
 }
 
+/**
+ * Report that the option is unknown, so that other code can handle
+ * it. This can be used as a callback together with
+ * OPTION_LOWLEVEL_CALLBACK to allow an option to be documented in the
+ * "-h" output even if it's not being handled directly by
+ * parse_options().
+ */
+int parse_opt_unknown_cb(const struct option *opt, const char *arg, int unset)
+{
+       return -2;
+}
+
 /**
  * Recreates the command-line option in the strbuf.
  */