email.rb

require 'date'
class Email
  attr_reader :email_text
  def initialize(email_text)
    @email_text = email_text
  end

  def date
    @date ||= parsed_date.strftime('%a %d %b %Y')
  end

  def time
    @time ||= parsed_date.strftime("%T")
  end

  def body
    unless email_text.include? "Content-Type: text/plain"
      return "no plain text, only html encoding" 
    end
    match_from_message(/Content-Type: text\/plain;([\s\S]*)/)
  end

  def subject
    @subject ||= fetch("Subject")
  end

  def to
    @to ||= fetch("To")
  end

  def from
    @from ||= fetch("From")
  end

  def to_s
    "to: #{to}\n" +
    "from: #{from}\n" +
    "date: #{date}\n" +
    "time: #{time}\n" +
    "subject: #{subject}\n" +
    "body: #{body}\n"
  end

  private

  def fetch(field)
    pattern = Regexp.new("\n#{field}: (.*)\n")
    match_from_message(pattern)
  end

  def match_from_message(pattern)
    email_text.scan(pattern).flatten.first
  end

  def parsed_date
    @parsed_date ||= DateTime.parse fetch("Date")
  end

end

email.txt

                                                                                                                                                                                                                                                               
Delivered-To: [email protected]
Received: by 10.76.7.237 with SMTP id m13csp60116oaa;
        Fri, 11 Oct 2013 14:42:36 -0700 (PDT)
X-Received: by 10.49.41.3 with SMTP id b3mr8278162qel.51.1381527756566;
        Fri, 11 Oct 2013 14:42:36 -0700 (PDT)
Return-Path: <[email protected]>
Received: from github-smtp2b-cp1-prd.iad.github.net (github-smtp2-ext3.iad.github.net. [192.30.252.194])
        by mx.google.com with ESMTPS id u5si10756913qcj.77.1969.12.31.16.00.00
        (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128);
        Fri, 11 Oct 2013 14:42:36 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 192.30.252.194 as permitted sender) client-ip=192.30.252.194;
Authentication-Results: mx.google.com;
       spf=pass (google.com: domain of [email protected] designates 192.30.252.194 as permitted sender) [email protected]
Date: Fri, 11 Oct 2013 13:53:23 -0700
From: GitHub <[email protected]>
To: [email protected]
Message-ID: <52586543d483d_bd31229d4417214d@github-worker7-cp1-prd.iad.github.net.mail>
Subject: Your subject here
Mime-Version: 1.0
Content-Type: text/plain;
 charset=UTF-8
Content-Transfer-Encoding: quoted-printable



Your message Body

email_spec.rb

require 'minitest/autorun'
require 'minitest/spec'

require_relative 'email'

describe Email do
  before do
    file = File.read('email.txt')
    @email = Email.new(file)
  end

  describe "#date" do 
    it "get's the date" do
      @email.date.must_equal "Fri 11 Oct 2013"
    end
  end

  describe "#time" do
    it "gets the time" do
      @email.time.must_equal "13:53:23"
    end
  end

  describe "#body" do
    it "returns a message if no plain text available" do
      e = Email.new("Foo")
      e.body.must_equal "no plain text, only html encoding"
    end

    it "returns the body if plain text version available" do
      message = <<-eos

 charset=UTF-8
Content-Transfer-Encoding: quoted-printable



Your message Body
      eos

      @email.body.must_equal message
    end
  end

  describe "#subject" do
    it "Returns the subject" do
      @email.subject.must_equal "Your subject here"
    end
  end

  describe "#to" do
    it "returns the recipient" do
      @email.to.must_equal "[email protected]"
    end
  end

  describe "#from" do
    it "returns the sender" do
      @email.from.must_equal "GitHub <[email protected]>"
    end
  end

  describe "#to_s" do
    it "returns a formatted string" do
      @email.to_s.must_equal <<-eos
to: [email protected]
from: GitHub <[email protected]>
date: Fri 11 Oct 2013
time: 13:53:23
subject: Your subject here
body: 
 charset=UTF-8
Content-Transfer-Encoding: quoted-printable



Your message Body

eos
    end
  end
end

runner.rb

require_relative 'email'

def help
  "Please rerun the file again and\n" + 
    "supply textfile arguments by name only\n" + 
    "after the file name\n" + 
    "(program will append the .txt extension)" +
    "Example: ruby thisfile.rb email2 email2 email3\n" + 
    "you can use as many files as you want."
end

abort help if ARGV.empty?

ARGV.each do |file|
  file = "#{file}.txt"
  unless File.exists?(file)
    puts "#{file} does not exist."
    puts "Press enter to move to next email..."
    $stdin.gets
    next
  end

  puts "Content for #{file}" 
  email= Email.new(File.read(file))
  puts email

  puts "Press enter to move to next email..."
  $stdin.gets
end

puts "Out of emails"
puts "Thank you for your consideration"