Move storage into configuration

lib/turning/configuration.rb

@@ -0,0 +1,9 @@
+module Turning
+  class Configuration
+    attr_writer :storage
+
+    def storage
+      @storage ||= FileStorage.new(Rails.root.join('public', 'static'))
+    end
+  end
+end

lib/turning/controller.rb

@@ -19,7 +19,7 @@ def view_path
     end
 
     def storage
-      FileStorage.new(Rails.root.join('public', 'static'))
+      Rails.configuration.turning.storage
     end
   end
 end

lib/turning/railtie.rb

@@ -1,12 +1,14 @@
 require 'rails/railtie'
 require 'turning/static_cascade'
 require 'turning/file_storage'
+require 'turning/configuration'
 
 module Turning
   class Railtie < ::Rails::Railtie
+    config.turning = Configuration.new
+
     initializer('turning.middleware') do
-      config.app_middleware.use StaticCascade,
-        FileStorage.new(Rails.root.join('public', 'static'))
+      config.app_middleware.use StaticCascade, config.turning.storage
     end
   end
 end

spec/turning/configuration_spec.rb

@@ -0,0 +1,19 @@
+require 'spec_helper'
+require 'turning/configuration'
+require 'turning/file_storage'
+
+describe Turning::Configuration do
+  it 'has a default storage backend' do
+    storage = stub('storage')
+    Turning::FileStorage.stubs(new: storage)
+    configuration = Turning::Configuration.new
+    configuration.storage.should == storage
+    Turning::FileStorage.should have_received(:new).with(Rails.root.join('public/static'))
+  end
+
+  it 'can change the storage backend' do
+    configuration = Turning::Configuration.new
+    configuration.storage = :anything
+    configuration.storage.should == :anything
+  end
+end