[close #381] Avoid Sprockets deprecations

.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
@@ -36,6 +37,8 @@ matrix:
   exclude:
     - gemfile: gemfiles/Gemfile-sass-3-4
       rvm: 1.9.3
+    - gemfile: gemfiles/Gemfile-sprockets-4-0
+      rvm: 1.9.3
     - gemfile: gemfiles/Gemfile-rails-5-0
       rvm: 1.9.3
     - gemfile: gemfiles/Gemfile-rails-5-0

lib/sass/rails/railtie.rb

@@ -54,8 +54,22 @@ 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)
+          args = ['.sass', Sass::Rails::SassTemplate]
+          args << { silence_deprecation: true } if env.method(:register_engine).arity.abs > 2
+          env.register_engine(*args)
+
+          args = ['.scss', Sass::Rails::ScssTemplate]
+          args << { silence_deprecation: true } if env.method(:register_engine).arity.abs > 2
+          env.register_engine(*args)
+        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

test/fixtures/alternate_config_project/app/assets/config/manifest.js

@@ -0,0 +1,3 @@
+//= link_tree ./images
+//= link_directory ../javascripts .js
+//= link_directory ../stylesheets .css

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."
 

test/fixtures/sass_project/app/assets/config/manifest.js

@@ -0,0 +1,3 @@
+//= link_tree ./images
+//= link_directory ../javascripts .js
+//= link_directory ../stylesheets .css

test/fixtures/scss_project/app/assets/config/manifest.js

@@ -0,0 +1,3 @@
+//= link_tree ./images
+//= link_directory ../javascripts .js
+//= link_directory ../stylesheets .css

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

test/sass_rails_test.rb

@@ -144,7 +144,7 @@ class SassRailsTest < Sass::Rails::TestCase
 
   test 'globbed imports work when new file is added' do
     project = 'scss_project'
-    filename = 'application.scss'
+    filename = 'application.css'
 
     within_rails_app(project) do |tmpdir|
       asset_output(filename)
@@ -161,7 +161,7 @@ class SassRailsTest < Sass::Rails::TestCase
 
   test 'globbed imports work when globbed file is changed' do
     project = 'scss_project'
-    filename = 'application.scss'
+    filename = 'application.css'
 
     within_rails_app(project) do |tmpdir|
       asset_output(filename)