adding "nodigest" task to add non digest assets

The new task `assets:nodigest` copies compiled files removing the md5 from the file.

README.md

@@ -29,6 +29,12 @@ Only removes old assets (keeps the most recent 3 copies) from `public/assets`. U
 
 Nuke `public/assets`.
 
+**`rake 'assets:generate_nondigests[app_sdk.js, app_sdk.css]''`**
+
+Will generate non-digest files of the files passed in the parameters of the task. Useful if you need some of your assets to be available for developers outside of your application (Javascript SDK for example).
+
+Remember that it's your responsibility to deal with cache expiration for those assets.
+
 #### Customize
 
 If the basic tasks don't do all that you need, it's straight forward to redefine them and replace them with something more specific to your app.

lib/sprockets/rails/task.rb

@@ -7,6 +7,9 @@
 module Sprockets
   module Rails
     class Task < Rake::SprocketsTask
+      class MissingParamsError < StandardError; end
+      class MissingFileError < StandardError; end
+
       attr_accessor :app
 
       def initialize(app = nil)
@@ -49,6 +52,16 @@ def manifest
         end
       end
 
+      def generate_nondigests(files)
+        files.each do |file|
+          digest_file = manifest.assets[file]
+          raise MissingFileError.new("#{file} does not exists. Maybe you didn't run assets:precompile yet?") unless digest_file
+
+          path = manifest.directory
+          FileUtils.cp("#{path}/#{digest_file}", "#{path}/#{file}")
+        end
+      end
+
       def define
         namespace :assets do
           %w( environment precompile clean clobber ).each do |task|
@@ -69,6 +82,16 @@ def define
             end
           end
 
+          desc "Compile non-digest files"
+          task :generate_nondigest => :environment do |t, args|
+            files = args.extras
+            raise MissingParamsError.new("You must pass the files you want to generate nondigests (e.g. rake 'assets:generate_nondigests[file1.js, file2.js]')") if files.empty?
+
+            with_logger do
+              generate_nondigests(files)
+            end
+          end
+
           desc "Remove old compiled assets"
           task :clean, [:keep] => :environment do |t, args|
             with_logger do

test/test_task.rb

@@ -25,7 +25,7 @@ def setup
     Sprockets::Rails::Task.new do |t|
       t.environment = @assets
       t.manifest    = @manifest
-      t.assets      = ['foo.js', 'foo-modified.js']
+      t.assets      = ['foo.js', 'foo-modified.js', 'file1.js', 'file2.js']
       t.log_level   = :fatal
     end
 
@@ -139,4 +139,38 @@ def test_clean_with_keep_specified
   ensure
     FileUtils.rm(new_path) if new_path
   end
+
+  def test_generate_nondigests
+    assert !@environment_ran
+    asset1_name = "file1.js"
+    asset2_name = "file2.js"
+
+    digest1_path = @assets[asset1_name].digest_path
+    digest2_path = @assets[asset2_name].digest_path
+
+    @rake['assets:precompile'].invoke
+    assert @environment_ran
+
+    setup
+
+    assert !@environment_ran
+    assert File.exist?("#{@dir}/#{digest1_path}")
+    refute File.exist?("#{@dir}/#{asset1_name}")
+    assert File.exist?("#{@dir}/#{digest2_path}")
+    refute File.exist?("#{@dir}/#{asset2_name}")
+
+    @rake['assets:generate_nondigest'].invoke(asset1_name, asset2_name)
+
+    assert @environment_ran
+    assert File.exist?("#{@dir}/#{digest1_path}"), "digest file 1 not found"
+    assert File.exist?("#{@dir}/#{asset1_name}"), "nondigest file 1 not found"
+    assert File.exist?("#{@dir}/#{digest2_path}"), "digest file 2 not found"
+    assert File.exist?("#{@dir}/#{asset2_name}"), "nondigest file 2 not found"
+  end
+
+  def test_generate_nondigests_with_no_params
+    assert_raises Sprockets::Rails::Task::MissingParamsError do
+      @rake['assets:generate_nondigest'].invoke
+    end
+  end
 end