Allow for register_engine without deprecation

.gitignore

@@ -6,3 +6,4 @@ doc
 docs
 pkg
 tmp
+.DS_Store

lib/sprockets.rb

@@ -124,32 +124,30 @@ module Sprockets
   # Mmm, CoffeeScript
   require 'sprockets/coffee_script_processor'
   Deprecation.silence do
-    register_engine '.coffee', CoffeeScriptProcessor, mime_type: 'application/javascript'
+    register_engine '.coffee', CoffeeScriptProcessor, mime_type: 'application/javascript', silence_deprecation: true
   end
 
   # JST engines
   require 'sprockets/eco_processor'
   require 'sprockets/ejs_processor'
   require 'sprockets/jst_processor'
   Deprecation.silence do
-    register_engine '.jst', JstProcessor, mime_type: 'application/javascript'
-    register_engine '.eco', EcoProcessor, mime_type: 'application/javascript'
-    register_engine '.ejs', EjsProcessor, mime_type: 'application/javascript'
+    register_engine '.jst', JstProcessor, mime_type: 'application/javascript', silence_deprecation: true
+    register_engine '.eco', EcoProcessor, mime_type: 'application/javascript', silence_deprecation: true
+    register_engine '.ejs', EjsProcessor, mime_type: 'application/javascript', silence_deprecation: true
   end
 
   # CSS engines
   require 'sprockets/sass_processor'
   Deprecation.silence do
-    register_engine '.sass', SassProcessor, mime_type: 'text/css'
-    register_engine '.scss', ScssProcessor, mime_type: 'text/css'
+    register_engine '.sass', SassProcessor, mime_type: 'text/css', silence_deprecation: true
+    register_engine '.scss', ScssProcessor, mime_type: 'text/css', silence_deprecation: true
   end
   register_bundle_metadata_reducer 'text/css', :sass_dependencies, Set.new, :+
 
   # Other
   require 'sprockets/erb_processor'
-  Deprecation.silence do
-    register_engine '.erb', ERBProcessor, mime_type: 'text/plain'
-  end
+  register_engine '.erb', ERBProcessor, mime_type: 'text/plain', silence_deprecation: true
 
   register_dependency_resolver 'environment-version' do |env|
     env.version

lib/sprockets/engines.rb

@@ -51,7 +51,16 @@ def engine_mime_types
     #     environment.register_engine '.coffee', CoffeeScriptProcessor
     #
     def register_engine(ext, klass, options = {})
-      Deprecation.new([caller.first]).warn("`register_engine` is deprecated please register a mime type and use `register_compressor` or `register_transformer`")
+      unless options[:silence_deprecation]
+        msg = <<-MSG
+Sprockets method `register_engine` is deprecated.
+Please register a mime type using `register_mime_type` then
+use `register_compressor` or `register_transformer`.
+https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
+        MSG
+
+        Deprecation.new([caller.first]).warn(msg)
+      end
 
       ext = Sprockets::Utils.normalize_extension(ext)
 

test/sprockets_test.rb

@@ -23,7 +23,7 @@ def silence_warnings
 
 NoopProcessor = proc { |input| input[:data] }
 # Sprockets.register_mime_type 'text/haml', extensions: ['.haml']
-Sprockets.register_engine '.haml', NoopProcessor, mime_type: 'text/html'
+Sprockets.register_engine '.haml', NoopProcessor, mime_type: 'text/html', silence_deprecation: true
 
 # Sprockets.register_mime_type 'text/ng-template', extensions: ['.ngt']
 AngularProcessor = proc { |input|
@@ -33,19 +33,19 @@ def silence_warnings
 });
   EOS
 }
-Sprockets.register_engine '.ngt', AngularProcessor, mime_type: 'application/javascript'
+Sprockets.register_engine '.ngt', AngularProcessor, mime_type: 'application/javascript', silence_deprecation: true
 
 # Sprockets.register_mime_type 'text/mustache', extensions: ['.mustache']
-Sprockets.register_engine '.mustache', NoopProcessor, mime_type: 'application/javascript'
+Sprockets.register_engine '.mustache', NoopProcessor, mime_type: 'application/javascript', silence_deprecation: true
 
 # Sprockets.register_mime_type 'text/x-handlebars-template', extensions: ['.handlebars']
-Sprockets.register_engine '.handlebars', NoopProcessor, mime_type: 'application/javascript'
+Sprockets.register_engine '.handlebars', NoopProcessor, mime_type: 'application/javascript', silence_deprecation: true
 
 # Sprockets.register_mime_type 'application/javascript-module', extensions: ['.es6']
-Sprockets.register_engine '.es6', NoopProcessor, mime_type: 'application/javascript'
+Sprockets.register_engine '.es6', NoopProcessor, mime_type: 'application/javascript', silence_deprecation: true
 
 # Sprockets.register_mime_type 'application/dart', extensions: ['.dart']
-Sprockets.register_engine '.dart', NoopProcessor, mime_type: 'application/javascript'
+Sprockets.register_engine '.dart', NoopProcessor, mime_type: 'application/javascript', silence_deprecation: true
 
 require 'nokogiri'
 
@@ -72,7 +72,7 @@ def silence_warnings
 Sprockets.register_transformer 'application/xml+builder', 'application/xml', XmlBuilderProcessor
 
 require 'sprockets/jst_processor'
-Sprockets.register_engine '.jst2', Sprockets::JstProcessor.new(namespace: 'this.JST2'), mime_type: 'application/javascript'
+Sprockets.register_engine '.jst2', Sprockets::JstProcessor.new(namespace: 'this.JST2'), mime_type: 'application/javascript', silence_deprecation: true
 
 SVG2PNG = proc { |input|
   "\x89\x50\x4e\x47\xd\xa\x1a\xa#{input[:data]}"

test/test_engines.rb

@@ -30,7 +30,7 @@ class TestEngines < Sprockets::TestCase
     env = new_environment
 
     Sprockets::SilenceDeprecation.silence do
-      env.register_engine ".alert", AlertProcessor
+      env.register_engine ".alert", AlertProcessor, silence_deprecation: true
     end
 
     asset = env["hello.alert"]