Parse only options from the command line in Ruby

only_options_parse.rb

# Here is a simple trick if you have a command line which
# needs to accept options on the command line of the form:
# $ mycommand domain=github.com ssl=true

defaults = {
  domain: 'www.example.com',
  port: 80,
  ssl: false
}
o = defaults.merge(
  Hash[
    ARGV.map do |a| 
      k,v = a.split('=')
      if v=='true'
        v = true
      elsif v=='false'
        v = false
      elsif v=~/^\d+$/
        v = v.to_i
      end
      [k.to_sym,v]
    end
  ]
)

# The typecasting could be improved but the idea is here.