From: Adam Penny <adam_penny@...>
Date: 2008-10-19T03:21:25+09:00
Subject: Handling invalid options with OptionParser

Hi there,

I wrote my own Wake on Lan Script in ruby that uses a Plist to look up
either target Mac address by selected printer or target MAC address by
server and I use option parser for this.

It all works fine if the arguments are input correctly, but if the
arguments are off you get something like this. -x is not declared in my
options and was a test to see how it did when it got something that it
didn't recognize.

ruby test.rb -x
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1443:in
`complete': invalid option: -x (OptionParser::InvalidOption)
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1441:in
`catch'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1441:in
`complete'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1280:in
`parse_in_order'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1247:in
`catch'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1247:in
`parse_in_order'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1241:in
`order!'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1332:in
`permute!'
  from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/optparse.rb:1353:in
`parse!'
  from test.rb:4

It's not the end of the world as if the options are wrong then it won't
do anything anyway, but I was wondering if anyone could tell me if
there's any method in the class or extra thing I could do to catch dodgy
arguments and output the help file or the banner rather than this
inelegant list of errors?

Thanks in advance.
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