CODEWITHSUNDEEP
rubyoptparse
Ntino
Ntino

Reputation:

optpase returns true class while string is provided in cmd line arguments

I'm stuck in a totally stupid situation. When I use the snippet below, despite my command line being "./the_script.rb -s serv" and I check the value of the service variable within the code, it's always taken to be of boolean class by optparse. So I cannot get my string from the command line...

any ideas ?

opt = OptionParser.new do |opt|

 opt.on('-s','--service','twitter (tw) or identica (id)') do |val| 
   service = val.to_s 
 end

end

Upvotes: 1

Views: 570

Answers (3)

Julien Lamarche
Julien Lamarche

Reputation: 1050

As you may see in the in code documentation of optparse.rb (in /usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/optparse.rb for me) under "==== Using Built-in Conversions", , you have to specify the string of the second argument to the on method:

 173 # ==== Using Built-in Conversions
 174 #
 175 # As an example, the built-in +Time+ conversion is used. The other built-in
 176 # conversions behave in the same way.
 177 # OptionParser will attempt to parse the argument
 178 # as a +Time+. If it succeeds, that time will be passed to the
 179 # handler block. Otherwise, an exception will be raised.
 180 #
 181 #   require 'optparse'
 182 #   require 'optparse/time'
 183 #   OptionParser.new do |parser|
 184 #     parser.on("-t", "--time [TIME]", Time, "Begin execution at given time") do |time|
 185 #       p time
 186 #     end
 187 #   end.parse!
 188 #

Thus 

opt.on('-s','--service [String]','twitter (tw) or identica (id)') do |val|

Upvotes: 0

gotgenes
gotgenes

Reputation: 40029

I'm a Python programmer, not a Ruby one, but browsing the examples in the Ruby docs for this, I'd say the default behavior as you have it is to act as a boolean. You need to specify more parameters for it to actually store the value.

opts.on("-s", "--service [SERVICE]", [:twitter, :identica], "Select a service (Twitter or Identica)" do |service|
    options.service = service
end

Then options.service should have the designated service. I think... Hey, it's Ruby. ;-)

Upvotes: 2

Ryan Bigg
Ryan Bigg

Reputation: 107728

I think you want to call opt.parse! on the block somewhere.

Upvotes: 0

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