Add generic document header, section, and footer components to render content into documents.

app/components/blacklight/document_component.html.erb

@@ -8,14 +8,20 @@
   itemtype: document.itemtype,
   class: classes.flatten.join(' ') do %>
   <%= header %>
+  <% header_components.each do |component| %>
+    <%= render component.new(presenter: @presenter, counter: @counter, document_counter: @document_counter) %>
+  <% end %>
+
   <% if body.present? %>
     <%= body %>
   <% else %>
     <div class="document-main-section">
       <%= title %>
-      <%= embed %>
-      <%= content %>
-      <%= metadata %>
+
+      <% section_components.each do |section| %>
+        <%= section %>
+      <% end %>
+
       <% metadata_sections.each do |section| %>
         <%= section %>
       <% end %>
@@ -27,5 +33,10 @@
 
     <%= thumbnail %>
   <% end %>
+
+  <% footer_components.each do |component| %>
+    <%= render component.new(presenter: @presenter, counter: @counter, document_counter: @document_counter) %>
+  <% end %>
+
   <%= footer %>
 <% end %>

app/components/blacklight/document_component.rb

@@ -127,6 +127,27 @@ def before_render
       end
     end
 
+    def header_components
+      view_config.document_header_components
+    end
+
+    def section_components
+      return to_enum(:section_components) unless block_given?
+
+      view_config.document_section_components&.each do |component_or_key|
+        case component_or_key
+        when Symbol, String
+          yield public_send(component_or_key)
+        when Class
+          yield render component_or_key.new(presenter: @presenter, counter: @counter, document_counter: @document_counter)
+        end
+      end
+    end
+
+    def footer_components
+      view_config.document_footer_components
+    end
+
     private
 
     delegate :view_config, to: :@presenter

lib/blacklight/configuration.rb

@@ -156,6 +156,9 @@ def initialized_default_configuration?
         document_metadata_component: Blacklight::DocumentMetadataComponent,
         document_thumbnail_component: Blacklight::Document::ThumbnailComponent,
         document_title_component: Blacklight::DocumentTitleComponent,
+        document_header_components: [],
+        document_section_components: [:embed, :content, :metadata],
+        document_footer_components: [],
         sidebar_component: Blacklight::Search::SidebarComponent,
         dropdown_component: Blacklight::System::DropdownComponent,
         # solr field to use to render a document title

lib/blacklight/configuration/view_config.rb

@@ -8,6 +8,12 @@ class ViewConfig < Blacklight::OpenStructWithHashAccess
     #   @return [Class] document presenter class used by helpers and views
     # @!attribute document_component
     #   @return [Class] component class used to render a document; defaults to Blacklight::DocumentComponent
+    # @!attribute document_header_components
+    #   @return [Array<Class>] component classes that render above the main document section
+    # @!attribute document_section_components
+    #   @return [Array<Symbol, String, Class>] component classes (or slot names) that render the main document section below the title
+    # @!attribute document_footer_components
+    #   @return [Array<Class>] component classes that render below the main document section
     # @!attribute document_title_component
     #   @return [Class] component class used to render a document title
     # @!attribute document_metadata_component

spec/components/blacklight/document_component_spec.rb

@@ -269,4 +269,32 @@ def call
       expect(page).to have_content "Prefix!"
     end
   end
+
+  context 'with configured components' do
+    let(:static_component) do
+      lambda { |text|
+        inline = Class.new(ViewComponent::Base) do
+          class_attribute :text
+          def self.name = 'StaticComponent'
+          def initialize(**); end
+
+          def call
+            text
+          end
+        end
+
+        inline.tap { |klass| klass.text = text }
+      }
+    end
+
+    it 'renders header, section, and footer components' do
+      blacklight_config.index.document_header_components = [static_component.call('Header')]
+      blacklight_config.index.document_section_components = [static_component.call('Section')]
+      blacklight_config.index.document_footer_components = [static_component.call('Footer')]
+
+      render_inline component
+      puts page.native.inner_html
+      expect(page).to have_content('Header').and have_content('Section').and have_content('Footer')
+    end
+  end
 end