in Ruby, OptionParser returns boolean instead of input values

Question

I'm trying to take the argument values using OptionParser. Instead of values, my code is returning only boolean:

require 'optparse'

options ={}
opts = OptionParser.new do |opts|
opts.on('-v')    { |version| options[:version] = version }
opts.on('-g')    { |branch| options[:branch] = branch }
opts.on('-f')    { |full| options[:full] = full }
opts.on('-h')    { RDoc::usage }
end.parse!

# mandatory options
if (options[:version] == nil)  or (options[:branch] == nil) or (options[:full]== nil) then
    puts options[:branch]
    puts options[:version]
    puts options[:full]
    RDoc::usage('usage')
end

puts options[:branch]

---> TRUE

Any idea?

Answer 1

If you want to capture a value you need to ask for it:

opts = OptionParser.new do |opts|
opts.on('-v=s') { |version| options[:version] = version }
opts.on('-g=s') { |branch| options[:branch] = branch }
opts.on('-f=s') { |full| options[:full] = full }
opts.on('-h') { RDoc::usage }

The =s notation means there's an associated value.

When defining interfaces like this don't forget to include long-form names for clarity like --version or --branch so people don't have to remember g means "branch".

All of this is covered in the fantastic documentation which I encourage you to read.