testing alternative (passthrough) compressor works inline, but not through Sprockets

features/minify_css.feature

@@ -21,4 +21,9 @@ Feature: Minify CSS
     Given "minify_css" feature is "enabled"
     And the Server is running at "test-app"
     When I go to "/stylesheets/site.css"
-    Then I should see "1" lines
+    Then I should see "1" lines
+    
+  Scenario: Rendering external css with passthrough compressor
+    Given the Server is running at "passthrough-app"
+    When I go to "/stylesheets/site.css"
+    Then I should see "41" lines

features/minify_javascript.feature

@@ -9,15 +9,47 @@ Feature: Minify Javascript
     And the Server is running at "test-app"
     When I go to "/inline-js.html"
     Then I should see "10" lines
+    
+  Scenario: Rendering inline js with a passthrough minifier
+    Given the Server is running at "passthrough-app"
+    When I go to "/inline-js.html"
+    Then I should see "11" lines
 
   Scenario: Rendering inline js with the feature enabled
     Given "minify_javascript" feature is "enabled"
     And the Server is running at "test-app"
     When I go to "/inline-js.html"
     Then I should see "5" lines
+    
+  Scenario: Rendering external js with the feature enabled
+    Given "minify_javascript" feature is "enabled"
+    And the Server is running at "test-app"
+    When I go to "/javascripts/js_test.js"
+    Then I should see "1" lines
+    
+  Scenario: Rendering external js with a passthrough minifier
+    And the Server is running at "passthrough-app"
+    When I go to "/javascripts/js_test.js"
+    Then I should see "5" lines
 
   Scenario: Rendering inline js (coffeescript) with the feature enabled
     Given "minify_javascript" feature is "enabled"
     And the Server is running at "test-app"
     When I go to "/inline-coffeescript.html"
+    Then I should see "5" lines
+  
+  Scenario: Rendering external js (coffeescript) with the feature enabled
+    Given "minify_javascript" feature is "enabled"
+    And the Server is running at "test-app"
+    When I go to "/javascripts/coffee_test.js"
+    Then I should see "1" lines
+    
+  Scenario: Rendering inline js (coffeescript) with a passthrough minifier
+    Given the Server is running at "passthrough-app"
+    When I go to "/inline-coffeescript.html"
+    Then I should see "17" lines
+    
+  Scenario: Rendering external js (coffeescript) with a passthrough minifier
+    And the Server is running at "passthrough-app"
+    When I go to "/javascripts/coffee_test.js"
     Then I should see "5" lines

fixtures/passthrough-app/config.rb

@@ -0,0 +1,17 @@
+module PassThrough
+  def self.compile(data)
+    data
+  end
+end
+
+set :js_compressor, PassThrough
+set :css_compressor, PassThrough
+
+activate :minify_javascript
+activate :minify_css
+
+with_layout false do
+  page "/inline-css.html"
+  page "/inline-js.html"
+  page "/inline-coffeescript.html"
+end

fixtures/passthrough-app/source/.htaccess

@@ -0,0 +1 @@
+# I'm an htaccess file!

fixtures/passthrough-app/source/inline-coffeescript.html.haml

@@ -0,0 +1,3 @@
+:coffeescript
+  race = (winner, runners...) ->
+    print winner, runners

fixtures/passthrough-app/source/inline-css.html.haml

@@ -0,0 +1,4 @@
+:sass
+  body
+    test: style
+    good: deal

fixtures/passthrough-app/source/inline-js.html.haml

@@ -0,0 +1,7 @@
+:javascript
+  ;(function() {
+    this;
+    should();
+    all.be();
+    on = { one: line };
+  })();

fixtures/passthrough-app/source/javascripts/coffee_test.js.coffee

@@ -0,0 +1,3 @@
+# Splats:
+race = (winner, runners...) ->
+  print winner, runners

fixtures/passthrough-app/source/javascripts/js_test.js

@@ -0,0 +1,8 @@
+var race;
+var __slice = Array.prototype.slice;
+
+race = function() {
+  var runners, winner;
+  winner = arguments[0], runners = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
+  return print(winner, runners);
+};

fixtures/passthrough-app/source/stylesheets/site.css.sass

@@ -0,0 +1 @@
+@import "compass/reset"

fixtures/test-app/source/javascripts/js_test.js

@@ -0,0 +1,8 @@
+var race;
+var __slice = Array.prototype.slice;
+
+race = function() {
+  var runners, winner;
+  winner = arguments[0], runners = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
+  return print(winner, runners);
+};

lib/middleman/extensions/minify_css.rb

@@ -2,9 +2,11 @@ module Middleman::Extensions
   module MinifyCss
     class << self
       def registered(app)
-        require "middleman/extensions/minify_css/cssmin"
         app.after_configuration do
-          set :css_compressor, ::CSSMin
+          if !css_compressor
+            require "middleman/extensions/minify_css/cssmin"
+            set :css_compressor, ::CSSMin
+          end
         end
       end
       alias :included :registered