Added a Rails Engine to show the letters if you are not running locally

app/controllers/letter_opener/letters_controller.rb

@@ -0,0 +1,12 @@
+module LetterOpener
+  class LettersController < ApplicationController
+    def index
+      @letters = Letter.all
+    end
+
+    def show
+      @letter = Letter.find_by_name(params[:id])
+      render :text=>@letter.contents(params[:style])
+    end
+  end
+end

app/models/letter_opener/letter.rb

@@ -0,0 +1,25 @@
+module LetterOpener
+  class Letter
+    attr_accessor :name, :updated_at
+
+    def initialize(attributes)
+      @name = attributes[:name]
+      @updated_at = attributes[:updated_at]
+    end
+
+    def self.all
+      letters = Dir.glob("#{LetterOpener.letters_location}/*").map do |folder|
+        new :name => File.basename(folder), :updated_at => File.mtime(folder)
+      end
+      letters.sort_by(&:updated_at).reverse
+    end
+
+    def self.find_by_name(name)
+      new(:name => name)
+    end
+
+    def contents(style = :plain)
+      File.read("#{LetterOpener.letters_location}/#{name}/#{style}.html")
+    end
+  end
+end

app/views/letter_opener/letters/index.html.erb

@@ -0,0 +1,8 @@
+Inbox:
+
+<%- @letters.each do |letter| %>
+  <div class="letter">
+    <%= link_to "#{letter.name} - #{letter.updated_at}", letter_opener_letter_path(letter.name, :style=>:plain) %>
+  </div>
+<%- end %>
+

config/routes.rb

@@ -0,0 +1,4 @@
+Rails.application.routes.draw do
+  match "/letter_opener"                => 'letter_opener/letters#index', :as => :letter_opener_letters
+  match "/letter_opener/:id/:style.html" => 'letter_opener/letters#show', :as => :letter_opener_letter
+end

letter_opener.gemspec

@@ -11,6 +11,7 @@ Gem::Specification.new do |s|
   s.require_path = "lib"
 
   s.add_dependency 'launchy'
+  s.add_development_dependency "rails", "~> 3.0"
   s.add_development_dependency 'rspec', '~> 2.6.0'
   s.add_development_dependency 'mail', '~> 2.3.0'
 

lib/letter_opener.rb

@@ -5,4 +5,4 @@
 
 require "letter_opener/message"
 require "letter_opener/delivery_method"
-require "letter_opener/railtie" if defined? Rails
+require "letter_opener/engine" if defined? Rails

lib/letter_opener/engine.rb

@@ -0,0 +1,12 @@
+module LetterOpener
+  class Engine < Rails::Engine
+    initializer "letter_opener.add_delivery_method" do
+      ActionMailer::Base.add_delivery_method :letter_opener, LetterOpener::DeliveryMethod, :location => LetterOpener.letters_location
+    end
+  end
+
+  def self.letters_location
+    Rails.root.join("tmp", "letter_opener")
+  end
+end
+

spec/app/models/letter_opener/letter_spec.rb

@@ -0,0 +1,47 @@
+require "spec_helper"
+require File.expand_path('../../../../../app/models/letter_opener/letter.rb', __FILE__)
+
+describe LetterOpener::Letter do
+  let(:location) { File.expand_path('../../../../../tmp/letter_opener/', __FILE__) }
+  before(:each) do
+    LetterOpener.stub(:letters_location).and_return(location)
+    FileUtils.rm_rf(location)
+    ['1111_1111', '2222_2222'].each do |folder|
+      FileUtils.mkdir_p("#{location}/#{folder}")
+      File.open("#{location}/#{folder}/plain.html", 'w') {|f| f.write("I am a plain email for #{folder}") }
+      File.open("#{location}/#{folder}/rich.html", 'w') {|f| f.write("I am an <b>html<b> email for #{folder}") }
+    end
+  end
+  describe '.all' do
+    let(:all) { LetterOpener::Letter.all }
+    describe '2222_2222 is first since it is most recent' do
+      subject { all.first }
+      its(:name) { should == '2222_2222' }
+      its(:contents) { should == 'I am a plain email for 2222_2222' }
+      it 'should read the rich contents when requested' do
+        subject.contents(:rich) { should == 'I am an <b>html</b> email for 2222_2222' }
+      end
+      it 'should read the plain contents when requested' do
+        subject.contents(:plain) { should == 'I am a text email for 2222_2222' }
+      end
+    end
+    describe '1111_1111 is last since it is oldest' do
+      subject { all.last }
+      its(:name) { should == '1111_1111' }
+      its(:contents) { should == 'I am a plain email for 1111_1111' }
+      it 'should read the rich contents when requested' do
+        subject.contents(:rich) { should == 'I am an <b>html</b> email for 1111_1111' }
+      end
+      it 'should read the plain contents when requested' do
+        subject.contents(:plain) { should == 'I am a text email for 1111_1111' }
+      end
+    end
+  end
+
+  describe '.find_by_name' do
+    subject { LetterOpener::Letter.find_by_name('1111_1111') }
+    its(:name) { should == '1111_1111' }
+    its(:contents) { should == 'I am a plain email for 1111_1111' }
+  end
+
+end

spec/letter_opener/delivery_method_spec.rb

@@ -3,7 +3,7 @@
 describe LetterOpener::DeliveryMethod do
   before(:each) do
     Launchy.stub(:open)
-    location = File.expand_path('../../../tmp/letter_opener', __FILE__)
+    location = File.expand_path('../../../../tmp/letter_opener', __FILE__)
     FileUtils.rm_rf(location)
     Mail.defaults do
       delivery_method LetterOpener::DeliveryMethod, :location => location