parse-options: add parse_options_check to validate option specs.

It only searches for now for the dreaded LASTARG_DEFAULT | OPTARG
combination, but can be extended to check for any other forbidden
combination.

Options are checked each time we call parse_options_start.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/parse-options.c b/parse-options.c
index b85cab2466244ec3c8ea97dc0882c2971e7b8061..79de18b37eb1aa96d2f25963b7f7cc2a08977846 100644 (file)
--- a/parse-options.c
+++ b/parse-options.c
@@ -306,6 +306,28 @@ static void check_typos(const char *arg, const struct option *options)
        }
 }
 
+static void parse_options_check(const struct option *opts)
+{
+       int err = 0;
+
+       for (; opts->type != OPTION_END; opts++) {
+               if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
+                   (opts->flags & PARSE_OPT_OPTARG)) {
+                       if (opts->long_name) {
+                               error("`--%s` uses incompatible flags "
+                                     "LASTARG_DEFAULT and OPTARG", opts->long_name);
+                       } else {
+                               error("`-%c` uses incompatible flags "
+                                     "LASTARG_DEFAULT and OPTARG", opts->short_name);
+                       }
+                       err |= 1;
+               }
+       }
+
+       if (err)
+               exit(129);
+}
+
 void parse_options_start(struct parse_opt_ctx_t *ctx,
                         int argc, const char **argv, const char *prefix,
                         int flags)
@@ -331,6 +353,8 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
 {
        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 
+       parse_options_check(options);
+
        /* we must reset ->opt, unknown short option leave it dangling */
        ctx->opt = NULL;