Extract components for document behaviors

app/components/blacklight/document/more_like_this_component.html.erb

@@ -0,0 +1,12 @@
+<div class="card">
+  <div class="card-header">More Like This</div>
+  <div class="card-body">
+    <ul>
+      <%= @document.more_like_this.each do |document| %>
+        <li class="more_like_this_document">
+          <span class="mlt_title"><%= link_to_document document %></span>
+        </li>
+      <% end %>
+    </ul>
+  </div>
+</div>

app/components/blacklight/document/more_like_this_component.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Blacklight
+  module Document
+    class MoreLikeThisComponent < ::ViewComponent::Base
+      with_collection_parameter :document
+
+      def initialize(document:)
+        @document = document
+      end
+
+      def render?
+        @document.more_like_this.present?
+      end
+
+      def link_to_document(*args)
+        @view_context.link_to_document(*args)
+      end
+    end
+  end
+end

app/components/blacklight/search_context_component.html.erb

@@ -0,0 +1,10 @@
+<div class='pagination-search-widgets'>
+
+  <div class="page-links">
+    <%= link_to_previous_document @search_context[:prev] %> |
+
+    <%= item_page_entry_info %> |
+
+    <%= link_to_next_document @search_context[:next] %>
+  </div>
+</div>

app/components/blacklight/search_context_component.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module Blacklight
+  class SearchContextComponent < ::ViewComponent::Base
+    with_collection_parameter :search_context
+
+    def initialize(search_context:, search_session:)
+      @search_context = search_context
+      @search_session = search_session
+    end
+
+    def render?
+      @search_context.present? && (@search_context[:prev] || @search_context[:next])
+    end
+
+    def item_page_entry_info
+      Deprecation.silence(Blacklight::CatalogHelperBehavior) do
+        @view_context.item_page_entry_info
+      end
+    end
+
+    def link_to_previous_document(*args)
+      @view_context.link_to_previous_document(*args)
+    end
+
+    def link_to_next_document(*args)
+      @view_context.link_to_next_document(*args)
+    end
+  end
+end

app/helpers/blacklight/catalog_helper_behavior.rb

@@ -103,6 +103,7 @@ def item_page_entry_info
                                                        total: number_with_delimiter(search_session['total']),
                                                        count: search_session['total'].to_i).html_safe
   end
+  deprecation_deprecate item_page_entry_info: 'Use Blacklight::SearchContextComponent methods instead'
 
   ##
   # Look up search field user-displayable label

app/views/catalog/_previous_next_doc.html.erb

@@ -1,12 +1 @@
-<% if @search_context[:prev] || @search_context[:next] %>
-  <div class='pagination-search-widgets'>
-
-    <div class="page-links">
-      <%= link_to_previous_document @search_context[:prev] %> |
-
-      <%= item_page_entry_info %> |
-
-      <%= link_to_next_document @search_context[:next] %>
-    </div>
-  </div>
-<% end %>
+<%= render(Blacklight::SearchContextComponent.new(search_context: @search_context, search_session: search_session)) %>

app/views/catalog/_show_sidebar.html.erb

@@ -1,12 +1,2 @@
 <%= render 'show_tools' %>
-
-<% unless document.more_like_this.empty? %>
-  <div class="card">
-    <div class="card-header">More Like This</div>
-    <div class="card-body">
-      <%= render collection: document.more_like_this,
-                 partial: 'show_more_like_this',
-                 as: :document %>
-    </div>
-  </div>
-<% end %>
+<%= render(Blacklight::Document::MoreLikeThisComponent.new(document: document)) %>

spec/views/catalog/_previous_next_doc.html.erb_spec.rb

@@ -1,6 +1,10 @@
 # frozen_string_literal: true
 
 RSpec.describe "catalog/_previous_next_doc.html.erb" do
+  before do
+    allow(view).to receive(:search_session).and_return({})
+  end
+
   it "without next or previous does not render content" do
     assign(:search_context, {})
     render