adding "nodigest" task to add non digest assets

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

Author: celsodantas

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 (`app_sdk.js` and `app_sdk.css` in the example above). 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