From: Stephan Wehner <stephanwehner@...>
Date: 2009-05-24T13:58:26+09:00
Subject: OptionParser: unexpected behaviour with -help

I ran into some unexpected behaviour with the Ruby OptionParser class.
When running this script (without any command line arguments) the output
is as in the last, commented, line.

--------------------------------------

require 'optparse'
options = {}
OptionParser.new do |opt|
 opt.on "--ex EXECUTABLE", String do |val|
    options[:ex] = val
  end
 opt.on "--headers" do |val|
    options[:headers] = val
  end
 opt.parse(%w( -help ))
end

puts options.inspect

# Output is {:ex=>"lp", :headers=>true}

--------------------------------------


I don't think that '-help' should be treated the same as '-h -ex lp' or
'-h --ex lp'. In particular, '-help' may be a misspelling of the
common  '--help' option. Am I doing something wrong? Is there a way to
avoid this?

Thanks a lot,

Stephan
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