add show_for_class option to config

lib/generators/show_for/templates/show_for.rb

@@ -3,6 +3,9 @@
   # The tag which wraps show_for calls.
   # config.show_for_tag = :div
 
+  # The DOM class set for show_for tag. Default is nil
+  # config.show_for_class = :custom
+
   # The tag which wraps each attribute/association call. Default is :p.
   # config.wrapper_tag = :dl
 

lib/show_for.rb

@@ -7,6 +7,9 @@ module ShowFor
   mattr_accessor :show_for_tag
   @@show_for_tag = :div
 
+  mattr_accessor :show_for_class
+  @@show_for_class = nil
+
   mattr_accessor :label_tag
   @@label_tag = :strong
 

lib/show_for/helper.rb

@@ -13,13 +13,19 @@ def show_for(object, html_options={}, &block)
       tag = html_options.delete(:show_for_tag) || ShowFor.show_for_tag
 
       html_options[:id]  ||= dom_id(object)
-      html_options[:class] = "show_for #{dom_class(object)} #{html_options[:class]}".rstrip
+      html_options[:class] = show_for_html_class(object, html_options)
 
       builder = html_options.delete(:builder) || ShowFor::Builder
       content = capture(builder.new(object, self), &block)
 
       content_tag(tag, content, html_options)
     end
+
+    private
+
+    def show_for_html_class(object, html_options)
+      "show_for #{dom_class(object)} #{html_options[:class]} #{ShowFor.show_for_class}".squeeze(" ").rstrip
+    end
   end
 end
 

test/helper_test.rb

@@ -37,4 +37,11 @@ class HelperTest < ActionView::TestCase
       assert_select "p.show_for"
     end
   end
+
+  test "show for class should be configurable" do
+    swap ShowFor, :show_for_class => :awesome do
+      concat(show_for(@user) do |f| end)
+      assert_select "div.show_for.user.awesome"
+    end
+  end
 end