From: Stefano Crocco <stefano.crocco@...>
Date: 2006-11-15T05:31:28+09:00
Subject: Re: parsing unknown options

unknown wrote:
> On Tue, 14 Nov 2006, Stefano Crocco wrote:
> 
>>
>> - load the plugin
>> - use OptionParser to rescan the options
>>
>> I'm still working on how to communicate the options recognized by the
>> plugin to the main program.
>>
>> Stefano
> 
> OptionParser already handles unknown options:
> 
>    begin
>      option_parser.parse! argv
>    rescue OptionParser::InvalidOption => e
>      # preverve unknown options
>      e.recover argv
>    end
> 
> 
> -a

Thanks for pointing this out. It's exactly what I was looking for, and I 
completely missed it. I've modified your code to store in a array the 
unrecognized options and their arguments, if any is provided:

unknown=[] #this is the array where the unknown options will be put

begin
  option_parser.parse! argv
rescue OptionParser::InvalidOption => e
  e.recover argv
  #recover just put the unknown option back into argv, so I extract it 
again and put it into unknown
  unknown << argv.shift

  #if argv still contains some elements, and the first one doesn't start 
with a -, i.e is the argument for the unknown option, I remove it as 
well
  unknown << argv.shift if argv.size>0 and temp.first[0..0]!='-'
  # go on with parsing
  retry
end

puts unknown


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