Re: Ambiguity elimination by using both command line options and configuration file

Lorenzo Bettini wrote:
> Yegor Yefremov wrote:
>   
>> Dear list,
>>
>> I have following situation:
>> I have both command line parameters and configuration file and I want
>> prevent defining the same option in both command line and configuration
>> file. At first I parse the command line options to obtain the configfile
>> file name and then I parse the configfile. When I define the option in
>> both I don't get any error. The program can check if I defined two
>> options in the same command line but it can't check it if I defined them
>> both in command line and configuration file due to the fact, that only
>> local_args_info will be checked. I think it is important issue to reduce
>> debugging overhead when operating with both command line and
>> configuration file.
>>     
>
> Hi there
>
> as you proposed in a previous private email, one solution could be to
> add a command line option
>
> -C|--conf-parser-noambiguity
>
> in order to make the parser check for these ambiguities...
>
> another solution might be to use different args_info structures for
> parsing the configuration file and the command line and use a function
> generated by gengetopt, e.g., check_dup (similar to the check_required
> generated function) that checks that non multiple options are not
> specified in both structures, what do you think?
>
> This would avoid overwhelming the parser function with many parameters...
>
> or did you mean that, when --conf-parser-noambiguity is specified and
> override is 0 when passed to the parser function, then a duplicate would
> generate an error?  Did you mean that --conf-parser-noambiguity should
> be a command line option or a gengetopt's command line option?
>
> cheers
> 	Lorenzo
>
>   
Hi Lorenzo

my suggestion about --conf-parser-noambiguity was for gengetopt's 
command line option as --conf-parser itself. I think it will be easier 
to implement as to define another structure. Here the example how to 
check the occurrence of the option:

        else if (strcmp (long_options[option_index].name, "cycles") == 0)
          {
            if (local_args_info.cycles_given || (args_info.cycles_given 
&& !override)) // additional check
              {
                fprintf (stderr, "%s: `--cycles' option given more than 
once%s\n", argv[0], (additional_error ? additional_error : ""));
                goto failure;
              }

I think it would do the job.

cheers
    Yegor