Remove code from the spree engine that is not needed in OFN

lib/spree/core/engine.rb

@@ -18,12 +18,8 @@ class Engine < ::Rails::Engine
         end
       end
 
-      # We need to reload the routes here due to how Spree sets them up.
-      # The different facets of Spree (backend, frontend, etc.) append/prepend
-      # routes to Core *after* Core has been loaded.
-      #
-      # So we wait until after initialization is complete to do one final reload.
-      # This then makes the appended/prepended routes available to the application.
+      # We reload the routes here
+      #   so that the appended/prepended routes are available to the application.
       config.after_initialize do
         Rails.application.routes_reloader.reload!
       end
@@ -37,27 +33,6 @@ class Engine < ::Rails::Engine
         ::ActiveRecord::Base.include Spree::Preferences::Preferable
       end
 
-      initializer "spree.register.calculators" do |app|
-        app.config.spree.calculators.shipping_methods = [
-          Spree::Calculator::Shipping::FlatPercentItemTotal,
-          Spree::Calculator::Shipping::FlatRate,
-          Spree::Calculator::Shipping::FlexiRate,
-          Spree::Calculator::Shipping::PerItem,
-          Spree::Calculator::Shipping::PriceSack
-        ]
-
-        app.config.spree.calculators.tax_rates = [
-          Spree::Calculator::DefaultTax
-        ]
-      end
-
-      initializer "spree.register.stock_splitters" do |app|
-        app.config.spree.stock_splitters = [
-          Spree::Stock::Splitter::ShippingCategory,
-          Spree::Stock::Splitter::Backordered
-        ]
-      end
-
       initializer "spree.register.payment_methods" do |app|
         app.config.spree.payment_methods = [
           Spree::Gateway::Bogus,
@@ -71,41 +46,6 @@ class Engine < ::Rails::Engine
         Mail.register_interceptor(Spree::Core::MailInterceptor)
       end
 
-      # We need to define promotions rules here so extensions and existing apps
-      # can add their custom classes on their initializer files
-      initializer 'spree.promo.environment' do |app|
-        app.config.spree.add_class('promotions')
-        app.config.spree.promotions = Spree::Promo::Environment.new
-        app.config.spree.promotions.rules = []
-      end
-
-      initializer 'spree.promo.register.promotion.calculators' do |app|
-        app.config.spree.calculators.add_class('promotion_actions_create_adjustments')
-        app.config.spree.calculators.promotion_actions_create_adjustments = [
-          Spree::Calculator::FlatPercentItemTotal,
-          Spree::Calculator::FlatRate,
-          Spree::Calculator::FlexiRate,
-          Spree::Calculator::PerItem,
-          Spree::Calculator::PercentPerItem,
-          Spree::Calculator::FreeShipping
-        ]
-      end
-
-      initializer 'spree.promo.register.promotion.calculators' do
-        Rails.application.config.spree.promotions.rules.concat [
-          Spree::Promotion::Rules::ItemTotal,
-          Spree::Promotion::Rules::Product,
-          Spree::Promotion::Rules::User,
-          Spree::Promotion::Rules::FirstOrder,
-          Spree::Promotion::Rules::UserLoggedIn
-        ]
-      end
-
-      initializer 'spree.promo.register.promotions.actions' do |app|
-        app.config.spree.promotions.actions = [Spree::Promotion::Actions::CreateAdjustment,
-                                               Spree::Promotion::Actions::CreateLineItems]
-      end
-
       # filter sensitive information during logging
       initializer "spree.params.filter" do |app|
         app.config.filter_parameters += [