code: public CommandOption findLong(String argument) {
  
  		Assert.notNullOrEmptyTrimmed(argument, "Missing long name!");
  
  		Optional<CommandOption> found = options.stream().filter(o -> o.isLong(argument)).findFirst();
  		return found.orElse(null);
  	}
docs: Finds option by long name
  
  @param argument long name
  @return found option or null if none found