remove defaults and add back parser rules

Author: ninsbl

raster/r.geomorphon/main.c

@@ -178,20 +178,22 @@ int main(int argc, char **argv)
 
         par_profiledata = G_define_standard_option(G_OPT_F_OUTPUT);
         par_profiledata->key = "profiledata";
-        par_profiledata->answer = "-";
         par_profiledata->required = NO;
         par_profiledata->description =
             _("Profile output file name (\"-\" for stdout)");
         par_profiledata->guisection = _("Profile");
+        G_option_requires(par_profiledata, par_coords, NULL);
+        G_option_requires(par_coords, par_profiledata, NULL);
 
         par_profileformat = G_define_option();
         par_profileformat->key = "profileformat";
         par_profileformat->type = TYPE_STRING;
         par_profileformat->options = "json,yaml,xml";
-        par_profileformat->answer = "json";
         par_profileformat->required = NO;
         par_profileformat->description = _("Profile output format");
         par_profileformat->guisection = _("Profile");
+        G_option_requires(par_profileformat, par_coords, NULL);
+        G_option_requires(par_coords, par_profileformat, NULL);
 
         if (G_parser(argc, argv))
             exit(EXIT_FAILURE);