From 0e85d0d282cdd99f54f91b84f44d059bb6225069 Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman@gmail.com>
Date: Thu, 21 Jul 2016 14:26:35 -0500
Subject: [PATCH] [close #381] Avoid Sprockets deprecations

- Use both `register_engine` and `register_transformer` in railtie.rb.
- In the test postprocessor use an object that responds to `call` and `new.render`.
---
 .travis.yml                                   |  1 +
 lib/sass/rails/railtie.rb                     | 13 ++++++++--
 .../engine_project/engine_project.gemspec     |  2 +-
 .../config/initializers/postprocessor.rb      | 26 ++++++++++++++++---
 4 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 4b2d1a6..53a703a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,7 @@ gemfile:
   - gemfiles/Gemfile-sprockets-2-12
   - gemfiles/Gemfile-sprockets-2-8
   - gemfiles/Gemfile-sprockets-3-0
+  - gemfiles/Gemfile-sprockets-4-0
   - gemfiles/Gemfile-sprockets-rails-2-2
   - gemfiles/Gemfile-sprockets-rails-master
   - gemfiles/Gemfile-sass-3-1
diff --git a/lib/sass/rails/railtie.rb b/lib/sass/rails/railtie.rb
index eed4749..fb63c2b 100644
--- a/lib/sass/rails/railtie.rb
+++ b/lib/sass/rails/railtie.rb
@@ -54,8 +54,17 @@ class Railtie < ::Rails::Railtie
       end
 
       config.assets.configure do |env|
-        env.register_engine '.sass', Sass::Rails::SassTemplate
-        env.register_engine '.scss', Sass::Rails::ScssTemplate
+        if env.respond_to?(:register_engine)
+          env.register_engine '.sass', Sass::Rails::SassTemplate, silence_deprecation: true
+          env.register_engine '.scss', Sass::Rails::ScssTemplate, silence_deprecation: true
+        end
+
+        if env.respond_to?(:register_transformer)
+          env.register_transformer 'text/sass', 'text/css',
+            Sprockets::SassProcessor.new(importer: SassImporter, sass_config: app.config.sass)
+          env.register_transformer 'text/scss', 'text/css',
+            Sprockets::ScssProcessor.new(importer: SassImporter, sass_config: app.config.sass)
+        end
 
         env.context_class.class_eval do
           class_attribute :sass_config
diff --git a/test/fixtures/engine_project/engine_project.gemspec b/test/fixtures/engine_project/engine_project.gemspec
index 2e9a82f..319d9f3 100644
--- a/test/fixtures/engine_project/engine_project.gemspec
+++ b/test/fixtures/engine_project/engine_project.gemspec
@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.version     = EngineProject::VERSION
   s.authors     = ["Your name"]
   s.email       = ["Your email"]
-  s.homepage    = "http://example.com"
+  s.homepage    = ""
   s.summary     = "Summary of EngineProject."
   s.description = "Description of EngineProject."
 
diff --git a/test/fixtures/scss_project/config/initializers/postprocessor.rb b/test/fixtures/scss_project/config/initializers/postprocessor.rb
index 37c4189..83952e7 100644
--- a/test/fixtures/scss_project/config/initializers/postprocessor.rb
+++ b/test/fixtures/scss_project/config/initializers/postprocessor.rb
@@ -1,5 +1,25 @@
-Rails.application.config.assets.configure do |env|
-  env.register_postprocessor 'text/css', :postprocessor do |context, css|
-    css.gsub /@import/, 'fail engine'
+
+class SassRailsTestPostProcessor
+  def initialize(filename, &block)
+    @filename = filename
+    @source   = block.call
+  end
+
+  def render(context)
+    self.class.run(@source)
+  end
+
+  def self.run(source)
+    source.gsub /@import/, 'fail engine'
   end
+
+  def self.call(input)
+    source = input[:data]
+    result = run(source)
+    { data: result }
+  end
+end
+
+Rails.application.config.assets.configure do |env|
+  env.register_postprocessor 'text/css', SassRailsTestPostProcessor
 end