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, 24 insertions, 1 deletions

diff --git a/layouts/global_nav.html b/layouts/global_nav.html
index 1bf3795a..f5b587a1 100644
--- a/layouts/global_nav.html
+++ b/layouts/global_nav.html
@@ -12,7 +12,7 @@
       </span>
 
       <!-- nav categories -->
-      <% if sec.has_children?  %>
+      <% if sec.has_children? && sec.enabled  %>
       <div class="collapse <%= navigation.show_element?(sec) ? 'show' : '' %>" id="<%= navigation.id_for(sec) %>">
         <% sec.children.each do |cat| %>
         <span class="global-nav-cat nav-link">
diff --git a/lib/gitlab/navigation.rb b/lib/gitlab/navigation.rb
index 022654e0..a3114931 100644
--- a/lib/gitlab/navigation.rb
+++ b/lib/gitlab/navigation.rb
@@ -3,6 +3,8 @@ module Gitlab
     def initialize(items, item)
       @items = items
       @item = item
+
+      disable_inactive_sections!
     end
 
     def nav_items
@@ -35,6 +37,20 @@ 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