Run image compress even if Rails.application.assets is nil

.rubocop.yml

@@ -62,5 +62,11 @@ Style/SpaceBeforeBlockBraces:
 Style/SpaceInsideHashLiteralBraces:
   EnforcedStyle: no_space
 
+Style/AlignParameters:
+  EnforcedStyle: with_first_parameter
+
+#Style/TrailingCommaInArguments:
+#  EnforcedStyleForMultiline: comma
+#Style/TrailingCommaInLiteral:
 Style/TrailingComma:
   EnforcedStyleForMultiline: comma

image_optim.gemspec

@@ -24,6 +24,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'image_optim_pack', '~> 0.2'
   s.add_development_dependency 'rspec', '~> 3.0'
   if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('1.9.3')
-    s.add_development_dependency 'rubocop', '~> 0.35'
+    s.add_development_dependency 'rubocop', '0.35'
   end
 end

lib/image_optim/image_optim_processor.rb

@@ -0,0 +1,39 @@
+class ImageOptim
+  # Adds image_optim_processor as class to avoid LegacyTildPreprocessor
+  # in sprockets
+  class ImageOptimProcessor
+    def self.opti_images_options=(options)
+      @options = options == true ? {} : (options || {})
+      image_optim
+    end
+
+    def self.call(input)
+      @environment  = input[:environment]
+      @uri          = input[:uri]
+      @filename     = input[:filename]
+      @dirname      = File.dirname(@filename)
+      @content_type = input[:content_type]
+      @required     = Set.new(input[:metadata][:required])
+      @stubbed      = Set.new(input[:metadata][:stubbed])
+      @links        = Set.new(input[:metadata][:links])
+      @dependencies = Set.new(input[:metadata][:dependencies])
+
+      data = process_source(input[:data])
+
+      {:data => data,
+       :required => @required,
+       :stubbed => @stubbed,
+       :links => @links,
+       :dependencies => @dependencies,
+       :charset => nil}
+    end
+
+    def self.process_source(data)
+      image_optim.optimize_image_data(data) || data
+    end
+
+    def self.image_optim
+      @image_optim ||= ImageOptim.new(@options)
+    end
+  end
+end

lib/image_optim/railtie.rb

@@ -1,4 +1,5 @@
 require 'image_optim'
+require 'image_optim/image_optim_processor'
 
 class ImageOptim
   # Adds image_optim as preprocessor for gif, jpeg, png and svg images
@@ -21,7 +22,7 @@ def register_preprocessor?(app)
       return if app.config.assets.compress == false
       return if app.config.assets.image_optim == false
 
-      app.assets
+      true
     end
 
     def options(app)
@@ -33,16 +34,29 @@ def options(app)
     end
 
     def register_preprocessor(app)
-      image_optim = ImageOptim.new(options(app))
+      ImageOptim::ImageOptimProcessor.opti_images_options = options(app)
 
-      processor = proc do |_context, data|
-        image_optim.optimize_image_data(data) || data
+      if defined?(Sprockets::Processor)
+        processor = proc do |_context, data|
+          ImageOptim::ImageOptimProcessor.process_source(data)
+        end
+        app.assets.register_preprocessor 'image/gif', :image_optim, &processor
+        app.assets.register_preprocessor 'image/jpeg', :image_optim, &processor
+        app.assets.register_preprocessor 'image/png', :image_optim, &processor
+        app.assets.register_preprocessor 'image/svg+xml', :image_optim,
+                                         &processor
+      else
+        app.config.assets.configure do |env|
+          env.register_preprocessor 'image/gif', :image_optim,
+                                    ImageOptim::ImageOptimProcessor
+          env.register_preprocessor 'image/jpeg', :image_optim,
+                                    ImageOptim::ImageOptimProcessor
+          env.register_preprocessor 'image/png', :image_optim,
+                                    ImageOptim::ImageOptimProcessor
+          env.register_preprocessor 'image/svg+xml', :image_optim,
+                                    ImageOptim::ImageOptimProcessor
+        end
       end
-
-      app.assets.register_preprocessor 'image/gif', :image_optim, &processor
-      app.assets.register_preprocessor 'image/jpeg', :image_optim, &processor
-      app.assets.register_preprocessor 'image/png', :image_optim, &processor
-      app.assets.register_preprocessor 'image/svg+xml', :image_optim, &processor
     end
   end
 end