Parse duplicated command-line options into a hash of arrays using Ruby

parse-duplicated-options.rb

#!/usr/bin/env ruby
# $ ./klass.rb --hoge=fuga --hoge=puyo --foo=bar
# {:h=>false, :hoge=>["fuga", "puyo"] :foo=>["bar"]}

require 'optparse'

class Klass
  attr_reader :opts
  
  def initialize(opts)
    @opts = opts
  end
  
  def run
    p opts
  end
end

if $0 == __FILE__
  args = Hash.new
  ARGV.each do |arg|
    match = /--(?<key>.*)=(?<value>.*)/.match(arg)
    next unless match
    args[match[:key]] = Array.new
    args[match[:key]] << match[:value]
  end
  ARGV.delete_if{|x|/--.*=.*/ =~ x}
  opts = ARGV.getopts("h").merge(args)
  Klass.new(opts.map{|k,v|[k.to_sym, v]}.to_h).run
end