Do not render inactive navigation sidebar sections

Contributes to https://gitlab.com/gitlab-org/gitlab-docs/-/issues/879

It saves up to 50% of the compiled files size

3 files changed, 31 insertions, 0 deletions

diff --git a/lib/gitlab/navigation.rb b/lib/gitlab/navigation.rb
index 052cdad5..ae5dbe9c 100644
--- a/lib/gitlab/navigation.rb
+++ b/lib/gitlab/navigation.rb
@@ -1,8 +1,14 @@
+require_relative '../helpers/generic'
+
 module Gitlab
   class Navigation
+    include Nanoc::Helpers::Generic
+
     def initialize(items, item)
       @items = items
       @item = item
+
+      disable_inactive_sections!
     end
 
     def nav_items
@@ -35,6 +41,20 @@ module Gitlab
 
     attr_reader :items, :item
 
+    def disable_inactive_sections!
+      return unless is_omnibus?
+
+      children.each do |section|
+        section.disable! unless has_active_element?([section])
+      end
+    end
+
+    def has_active_element?(collection)
+      return false unless collection
+
+      collection.any? { |element| show_element?(element) || has_active_element?(element.children) }
+    end
+
     def dir
       @dir ||= item.identifier.to_s[%r{(?<=/)[^/]+}]
     end
diff --git a/lib/gitlab/navigation/section.rb b/lib/gitlab/navigation/section.rb
index 8b761fb8..82b19d3e 100644
--- a/lib/gitlab/navigation/section.rb
+++ b/lib/gitlab/navigation/section.rb
@@ -3,6 +3,13 @@ module Gitlab
     class Section
       def initialize(section)
         @section = section
+        @enabled = true
+      end
+
+      attr_reader :enabled
+
+      def disable!
+        @enabled = false
       end
 
       def title
diff --git a/lib/helpers/generic.rb b/lib/helpers/generic.rb
index 2bc27ea8..5e5ea01b 100644
--- a/lib/helpers/generic.rb
+++ b/lib/helpers/generic.rb
@@ -8,5 +8,9 @@ module Nanoc::Helpers
     def is_production?
       ENV['NANOC_ENV'] == 'production'
     end
+
+    def is_omnibus?
+      ENV['NANOC_ENV'] == 'omnibus'
+    end
   end
 end