cli argument parsing now makes use of stop function, stops arg parsing when...

cli argument parsing now makes use of stop function, stops arg parsing when the first registered operator is found

src/cdo.cc

@@ -382,7 +382,8 @@ main(int argc, char *argv[])
   setup_options();
   setup_cli_options();
 
-  auto CDO_optind = CLIOptions::parse(std::vector<std::string>(argv, argv + argc));
+  auto CDO_optind = CLIOptions::parse(std::vector<std::string>(argv, argv + argc),
+                                      [](const std::string arg) { return Factory::exists(arg); });
 
   if (CDO_optind == CLIOptions::ABORT_REQUESTED) exit(EXIT_FAILURE);
   if (CDO_optind == CLIOptions::EXIT_REQUESTED) exit(EXIT_SUCCESS);