require 'forwardable'
#---
# Excerpted from "Seven Languages in Seven Weeks",
# published by The Pragmatic Bookshelf.
# Copyrights apply to this code. It may not be used to create training material, 
# courses, books, articles, and the like. Contact us if you are in doubt.
# We make no guarantees that this code is fit for any purpose. 
# Visit http://www.pragmaticprogrammer.com/titles/btlang for more book information.
#---
module ActsAsCsv
  def self.included(base)
    base.extend ClassMethods
  end
  
  module ClassMethods
    def acts_as_csv
      include InstanceMethods
    end
  end
  
  module InstanceMethods   
    extend Forwardable
    include Enumerable

    def read
      @csv_contents = []
      filename = self.class.to_s.downcase + '.txt'
      file = File.new(filename)
      @headers = file.gets.chomp.split(',')

      file.each do |row|
        @csv_contents << CsvRow.new(@headers, row.chomp.split(','))
      end
    end
    
    attr_accessor :headers, :csv_contents
    def_delegators :@csv_contents, :each
    def initialize
      read 
    end
  end

  class CsvRow < Struct.new(:headers, :cells)
    def method_missing(name)
      self.cells[self.headers.index(name.to_s)]
    end
  end
end

class RubyCsv  # no inheritance! You can mix it in
  include ActsAsCsv
  acts_as_csv
end

m = RubyCsv.new
puts m.headers.inspect
puts m.csv_contents.inspect
m.each {|row| puts row.one}