day3

ruby/day3.rb

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+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}

ruby/rubycsv.txt

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+one,two
+lions,tigers
+bears,sheep