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

[Jordan Willis <jwillis0720@gmail.com>]

I think I’m confused the present way you have it would have the an option and an argument. 

my program -foo 0 somefasta.fasta

In this case, what is the point of foo?

Since you put the fasta file as an argument and not an option, it must be specified. I think what you want is to add the fasta file as an option then use the getOptionValue method to see if it has been used. 

Jordan


> On Jul 9, 2016, at 11:35 PM, 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
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