Re: [Seqan-dev] ArgParseArgument list allowing zero or more items?

[Bernard James Pope <bjpope@unimelb.edu.au>]

Thanks René,

I have posted my question there.

Cheers,
Bernie

> On 28 Jul 2016, at 8:00 pm, Rahn, René <rene.maerker@fu-berlin.de> wrote:
> 
> Hi Bernie, 
> 
> thank you very much for writing us. 
> I'd like you to raise such questions on the issue site on our github page: https://github.com/seqan/seqan/issues.
> The mailing list is not-so-up-to-date anymore, and we will probably use this mailing list merely as a news feeder in the future to inform you about new releases or training courses.
> 
> Thank you very much for you understanding.
> 
> Kind regards,
> 
> René
> 
>> On 10 Jul 2016, at 08:35, Bernard James Pope <bjpope@unimelb.edu.au> wrote:
>> 
>> Hi SEQAN devs,
>> 
>> I'm writing a program which accepts zero or more FASTA files on the command line, as positional arguments.
>> 
>> If zero files are specified, then it will default to reading from standard input.
>> 
>> I want to write a Seqan argument parser to capture this behaviour. However, I seem stuck with a solution that requires at least one file to be specified.
>> 
>> Here's a sketch of what I have:
>> 
>>   ArgumentParser parser(PROGRAM_NAME);
>>   addOption(parser, ArgParseOption("f", "foo", "Silly example", ArgParseArgument::INTEGER, "INT"));
>> 
>>   addArgument(parser, ArgParseArgument(ArgParseArgument::STRING, "FASTA_FILE", true));
>> 
>>   ArgumentParser::ParseResult res = parse(parser, argc, argv);
>> 
>> Notice that isListArgument is set to true.
>> 
>> However, when I run my program, and specify zero positional arguments (but some other option arguments), e.g.
>> 
>>    $ myprogram -foo 0
>> 
>> I get the error:
>> 
>>    Not enough arguments were provided.
>> 
>> Is there a way to achieve what I want to do?
>> 
>> I thought I might be able to default the ArgParseArgument to be an empty vector somehow, but couldn't get that to work.
>> 
>> If anyone has used the Python ArgumentParser before, the behaviour I want to emulate is the ability to specify nargs='*'
>> 
>> Cheers,
>> Bernie
>> _______________________________________________
>> seqan-dev mailing list
>> seqan-dev@lists.fu-berlin.de
>> https://lists.fu-berlin.de/listinfo/seqan-dev
> 
> ---
> 
> René Rahn
> Ph.D. Student (de.NBI - CIBI)
> --------------------------------
> Tel:  (+49) 30 838 75137
> Mail: rene.rahn@fu-berlin.de
> --------------------------------
> Institute of Computer Science
> Algorithmic Bioinformatics (ABI)
> --------------------------------
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> 14195 Berlin
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