deal with a coffeescript file

.gitignore

@@ -16,3 +16,5 @@ test/tmp
 test/version_tmp
 tmp
 rerun.txt
+.tmp/
+template.erb

features/process_with_sprockets.feature

@@ -10,6 +10,7 @@ Feature: Process files with Sprockets
       another file
       """
 
+  @fakefs
   Scenario: Simple Sprockets work
     When I instantiate a Sprockets handler with the following asset directories:
       | dir |
@@ -18,6 +19,7 @@ Feature: Process files with Sprockets
       | dir/other.js |
       | dir/file.js |
 
+  @fakefs
   Scenario: Require the file twice
     Given I have the file "dir/third.js" with the content:
       """
@@ -33,3 +35,18 @@ Feature: Process files with Sprockets
       | dir/file.js |
       | dir/third.js |
 
+  @realfs
+  Scenario: A CoffeeScript file
+    Given I have the file "dir/third.js.coffee" with the content:
+      """
+      #= require other
+      for file in [ 'files' ]
+        alert(file)
+      """
+    When I instantiate a Sprockets handler with the following asset directories:
+      | dir |
+      And I work with the Sprockets asset "third"
+    Then the handler should have the following files in order:
+      | dir/other.js |
+      | <%= temp_path_for("dir/third.js.coffee") %> |
+      And there should be a temp file for the local path "dir/third.js.coffee"

features/step_definitions/given/coffeescript/i_have_coffeescript_template_processor.rb

@@ -0,0 +1,3 @@
+Given /^I have a CoffeeScript template processor for the file "([^"]*)"$/ do |file|
+  @template_processor = Flowerbox::Delivery::Tilt::CoffeeTemplate.new(file)
+end

features/step_definitions/given/i_have_file.rb

@@ -3,3 +3,4 @@ Given /^I have the file "([^"]*)" with the content:$/ do |filename, string|
 
   File.open(filename, 'wb') { |fh| fh.print(string) }
 end
+

features/step_definitions/then/handler_should_have_files_in_order.rb

@@ -1,5 +1,9 @@
+require 'erb'
+
 Then /^the handler should have the following files in order:$/ do |table|
-  table.raw.collect(&:first).each_with_index do |path, index|
+  table.raw.flatten.each_with_index do |path, index|
+    path = ERB.new(path).result(binding)
+
     @sprockets.files[index].should == Pathname(File.expand_path(path))
   end
 end

features/step_definitions/then/temp_file/should_be_temp_file_for_local_path.rb

@@ -0,0 +1,7 @@
+Then /^there should be a temp file for the local path "([^"]*)"$/ do |path|
+  path.gsub!(%r{\.js.*$}, '.js')
+
+  @temp_file_path = Dir[".tmp/**/#{path}"].first
+
+  @temp_file_path.should_not be_nil
+end

features/step_definitions/then/temp_file/should_contain.rb

@@ -0,0 +1,7 @@
+Then /^the temp file should contain:$/ do |string|
+  file_lines = File.read(@temp_file_path).lines.collect(&:strip)
+
+  string.lines.each do |line|
+    file_lines.should include(line.strip)
+  end
+end

features/step_definitions/then/tilt/result_should_be_path_to_file.rb

@@ -0,0 +1,3 @@
+Then /^the evaluated template should be the path to the temp file for "([^"]*)"$/ do |file|
+  @temp_file_path.should == @result
+end

features/step_definitions/when/tilt/i_evaluate_template.rb

@@ -0,0 +1,3 @@
+When /^I evaluate the template$/ do
+  @result = @template_processor.render
+end

features/support/env.rb

@@ -11,10 +11,14 @@ class FakeFS::File::Stat
   end
 end
 
+class FakeFS::File
+  def self.executable?(file)
+    false
+  end
+end
+
 Before do
   mocha_setup
-
-  FakeFS.activate!
 end
 
 After do
@@ -24,8 +28,6 @@ After do
     mocha_teardown
   end
 
-  FakeFS.deactivate!
-
   if @running_server
     @running_server[:server].shutdown
     @running_server = nil
@@ -35,3 +37,24 @@ After do
 
   @server.stop if @server
 end
+
+def temp_path_for(file)
+  File.join('.tmp/sprockets', File.expand_path(file.gsub(%r{\.js.*$}, '.js')))
+end
+
+Before('@fakefs') do
+  FakeFS.activate!
+end
+
+After('@fakefs') do
+  FakeFS::FileSystem.clear
+  FakeFS.deactivate!
+end
+
+Before('@realfs') do
+  FileUtils.rm_rf 'dir'
+end
+
+After('@realfs') do
+  FileUtils.rm_rf 'dir'
+end

flowerbox-delivery.gemspec

@@ -21,6 +21,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'mocha'
   gem.add_development_dependency 'fakefs'
   gem.add_development_dependency 'nokogiri'
+  gem.add_development_dependency 'therubyracer'
 
   gem.add_runtime_dependency 'rack'
   gem.add_runtime_dependency 'sprockets'

lib/flowerbox/delivery.rb

@@ -4,6 +4,8 @@ module Flowerbox
     autoload :TemplateRenderer, 'flowerbox/delivery/template_renderer'
     autoload :SprocketsHandler, 'flowerbox/delivery/sprockets_handler'
     autoload :UniqueAssetList, 'flowerbox/delivery/unique_asset_list'
+
+    autoload :Tilt, 'flowerbox/delivery/tilt'
   end
 end
 

lib/flowerbox/delivery/sprockets_handler.rb

@@ -11,7 +11,7 @@ module Flowerbox::Delivery
     end
 
     def add(asset)
-      @files.add(paths_for(asset))
+      paths_for(asset).each { |path| @files.add(path_for_compiled_asset(path)) }
     end
 
     def paths_for(asset)
@@ -22,8 +22,19 @@ module Flowerbox::Delivery
       return @environment if @environment
 
       @environment = Sprockets::Environment.new
+      @environment.unregister_postprocessor('application/javascript', Sprockets::SafetyColons)
+      @environment.register_engine('.js', Flowerbox::Delivery::Tilt::JSTemplate)
+
       options[:asset_paths].each { |path| @environment.append_path(path) }
       @environment
     end
+
+    def asset_for(*args)
+      environment.find_asset(*args)
+    end
+
+    def path_for_compiled_asset(path)
+      Pathname(asset_for(path, :bundle => false).to_s)
+    end
   end
 end

lib/flowerbox/delivery/tilt.rb

@@ -0,0 +1,6 @@
+require 'sprockets'
+
+module Flowerbox::Delivery::Tilt
+  autoload :JSTemplate, 'flowerbox/delivery/tilt/js_template'
+end
+

lib/flowerbox/delivery/tilt/js_template.rb

@@ -0,0 +1,28 @@
+require 'tilt'
+
+class Flowerbox::Delivery::Tilt::JSTemplate < Tilt::Template
+  self.default_mime_type = "application/javascript"
+
+  def prepare ; end
+
+  def evaluate(scope, locals, &block)
+    case File.extname(file)
+    when '.js'
+      file
+    else
+      save
+    end
+  end
+
+  def save
+    FileUtils.mkdir_p File.dirname(temp_file)
+    File.open(temp_file, 'wb') { |fh| fh.print data }
+
+    temp_file
+  end
+
+  def temp_file
+    File.join(Dir.pwd, ".tmp/sprockets", file.gsub(%r{(\.js)(.*)$}, '\1'))
+  end
+end
+

lib/flowerbox/delivery/unique_asset_list.rb

@@ -1,7 +1,7 @@
 module Flowerbox::Delivery
   class UniqueAssetList < ::Array
     def add(files)
-      files.each { |file| self << file if !include?(file) }
+      [ files ].flatten.each { |file| self << file if !include?(file) }
     end
 
     private

spec/flowerbox/delivery/sprockets_handler_spec.rb

@@ -7,16 +7,20 @@ describe Flowerbox::Delivery::SprocketsHandler do
 
   describe '#add' do
     let(:asset) { 'asset' }
-    let(:paths) { [ 'paths' ] }
+    let(:path) { 'path' }
+    let(:paths) { [ path ] }
+
+    let(:pathname_path) { 'pathname path' }
 
     before do
       sprockets_handler.expects(:paths_for).with(asset).returns(paths)
+      sprockets_handler.expects(:path_for_compiled_asset).with(path).returns(pathname_path)
     end
 
     it 'should add the asset to the list of ones to work with' do
       sprockets_handler.add(asset)
 
-      sprockets_handler.files.should == paths
+      sprockets_handler.files.should == [ pathname_path ]
     end
   end
 

spec/flowerbox/delivery/tilt/js_template_spec.rb

@@ -0,0 +1,62 @@
+require 'spec_helper'
+
+describe Flowerbox::Delivery::Tilt::JSTemplate do
+  let(:js_template) { described_class.new { '' } }
+
+  describe '#evaluate' do
+    subject { js_template.evaluate(Object.new, {}) }
+
+    before do
+      js_template.stubs(:file).returns(file)
+    end
+
+    context '.js' do
+      let(:file) { 'file.js' }
+
+      it { should == file }
+    end
+
+    context 'other extension' do
+      let(:file) { 'file.coffee' }
+      let(:temp_file) { 'temp file' }
+
+      before do
+        js_template.expects(:save).returns(temp_file)
+      end
+
+      it { should == temp_file }
+    end
+  end
+
+  describe '#save' do
+    include FakeFS::SpecHelpers
+
+    let(:temp_file) { 'dir/temp file' }
+    let(:data) { 'data' }
+
+    before do
+      js_template.stubs(:temp_file).returns(temp_file)
+      js_template.stubs(:data).returns(data)
+    end
+
+    it 'should save the file to disk and return the temp path' do
+      js_template.save.should == temp_file
+
+      File.read(temp_file).should == data
+    end
+  end
+
+  describe '#temp_file' do
+    subject { js_template.temp_file }
+
+    let(:filename) { "#{root_filename}.ext" }
+    let(:root_filename) { "dir/file.js" }
+
+    before do
+      js_template.stubs(:file).returns(filename)
+    end
+
+    it { should == File.join(Dir.pwd, '.tmp/sprockets', root_filename) }
+  end
+end
+

spec/flowerbox/delivery/unique_asset_list_spec.rb

@@ -9,7 +9,8 @@ describe Flowerbox::Delivery::UniqueAssetList do
     let(:third) { Pathname.new('two') }
 
     it 'should not add assets already added' do
-      unique_asset_list.add([ first, second, third ])
+      unique_asset_list.add(first)
+      unique_asset_list.add([ second, third ])
 
       unique_asset_list.should == [ first, third ]
     end