Modify how branding works

- rename get_brand method
- have explicit methods for color and border-color instead of one with a parameter

docs/component_branding.md

@@ -16,12 +16,12 @@ To add colours to a component, modify the component to follow the example below.
   brand_helper = GovukPublishingComponents::Presenters::BrandHelper.new(brand)
 %>
 
-<div class="gem-c-component <%= brand_helper.get_brand %>">
-  <div class="gem-c-component__title <%= brand_helper.get_brand_element("border-color") %>">
+<div class="gem-c-component <%= brand_helper.brand_class %>">
+  <div class="gem-c-component__title <%= brand_helper.brand_border_color %>">
     Example element that requires a coloured border
   </div>
 
-  <a href="#" class="<%= brand_helper.get_brand_element("color") %>">
+  <a href="#" class="<%= brand_helper.brand_color %>">
     Example element that requires coloured text
   </a>
 </div>

lib/govuk_publishing_components/presenters/brand_helper.rb

@@ -5,12 +5,16 @@ def initialize(brand)
         @brand = brand if brand
       end
 
-      def get_brand
+      def brand_class
         "brand--#{@brand}" if @brand
       end
 
-      def get_brand_element(attribute)
-        "brand__#{attribute}" if @brand
+      def border_color_class
+        "brand__border-color" if @brand
+      end
+
+      def color_class
+        "brand__color" if @brand
       end
     end
   end