From bce60ab11de221f30e773abbaae28c4e41954aaa Mon Sep 17 00:00:00 2001
From: Martin Jones <martin.jones@digital.cabinet-office.gov.uk>
Date: Thu, 20 Jul 2023 10:35:10 +0100
Subject: [PATCH] Add processor to remove blue bar from nav menu

---
 lib/slimmer.rb                             |  1 +
 lib/slimmer/headers.rb                     |  5 +++++
 lib/slimmer/processors/blue_bar_remover.rb | 14 ++++++++++++++
 lib/slimmer/skin.rb                        |  1 +
 4 files changed, 21 insertions(+)
 create mode 100644 lib/slimmer/processors/blue_bar_remover.rb

diff --git a/lib/slimmer.rb b/lib/slimmer.rb
index dd1934af..bd7a6d93 100644
--- a/lib/slimmer.rb
+++ b/lib/slimmer.rb
@@ -33,6 +33,7 @@ def fetch(*)
 
   module Processors
     autoload :AccountsShower, "slimmer/processors/accounts_shower"
+    autoload :BlueBarRemover, "slimmer/processors/blue_bar_remover"
     autoload :BodyClassCopier, "slimmer/processors/body_class_copier"
     autoload :BodyInserter, "slimmer/processors/body_inserter"
     autoload :ConditionalCommentMover, "slimmer/processors/conditional_comment_mover"
diff --git a/lib/slimmer/headers.rb b/lib/slimmer/headers.rb
index 118f05a5..91d7e152 100644
--- a/lib/slimmer/headers.rb
+++ b/lib/slimmer/headers.rb
@@ -19,6 +19,7 @@ module Headers
       section: "Section",
       skip: "Skip",
       template: "Template",
+      remove_blue_bar: "Remove-Blue-Bar",
       remove_search: "Remove-Search",
       show_accounts: "Show-Accounts",
     }.freeze
@@ -26,6 +27,9 @@ module Headers
     # @private
     APPLICATION_NAME_HEADER = "#{HEADER_PREFIX}-#{SLIMMER_HEADER_MAPPING[:application_name]}".freeze
 
+    # @private
+    REMOVE_BLUE_BAR_HEADER = "#{HEADER_PREFIX}-#{SLIMMER_HEADER_MAPPING[:remove_blue_bar]}".freeze
+
     # @private
     FORMAT_HEADER = "#{HEADER_PREFIX}-#{SLIMMER_HEADER_MAPPING[:format]}".freeze
 
@@ -66,6 +70,7 @@ module Headers
     # @option hash [String] format
     # @option hash [String] organisations
     # @option hash [String] page_owner
+    # @option hash [String] remove_blue_bar
     # @option hash [String] remove_search
     # @option hash [String] result_count
     # @option hash [String] search_parameters
diff --git a/lib/slimmer/processors/blue_bar_remover.rb b/lib/slimmer/processors/blue_bar_remover.rb
new file mode 100644
index 00000000..c9eb365f
--- /dev/null
+++ b/lib/slimmer/processors/blue_bar_remover.rb
@@ -0,0 +1,14 @@
+module Slimmer::Processors
+  class BlueBarRemover
+    def initialize(headers)
+      @headers = headers
+    end
+
+    def filter(_src, dest)
+      if @headers.include?(Slimmer::Headers::REMOVE_BLUE_BAR_HEADER)
+        blue_bar = dest.at_css(".gem-c-layout-for-public__blue-bar")
+        blue_bar.remove if blue_bar
+      end
+    end
+  end
+end
diff --git a/lib/slimmer/skin.rb b/lib/slimmer/skin.rb
index fd29522e..e50a3b59 100644
--- a/lib/slimmer/skin.rb
+++ b/lib/slimmer/skin.rb
@@ -118,6 +118,7 @@ def success(source_request, response, body)
         Processors::SearchPathSetter.new(response),
         Processors::SearchRemover.new(response.headers),
         Processors::AccountsShower.new(response.headers),
+        Processors::BlueBarRemover.new(response.headers),
       ]
 
       template_name = response.headers[Headers::TEMPLATE_HEADER] || "gem_layout"