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List:       ruby-talk
Subject:    Re: optparser question
From:       Robert Klemme <shortcutter () googlemail ! com>
Date:       2010-06-30 12:34:21
Message-ID: AANLkTil9QmO3x_IYoIhZUW5RRStEknAdLINupER-cWHC () mail ! gmail ! com
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2010/6/30 Zhao Yi <youhaodeyi@gmail.com>:
> I am using optparser to parse arguments.How can I set a mandatory
> option? If user doesn't specify this option, parse() method should throw
> an error message.

There are no mandatory options - after all, they are _options_.  You
can only have mandatory arguments to options:

http://www.ruby-doc.org/stdlib/libdoc/optparse/rdoc/classes/OptionParser.html

You need an extra flag which you set when the option is seen. Then you
can throw or do whatever after #parse has finished.

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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