Make page title logic (mostly) match production

app/helpers/um_arclight_helper.rb

@@ -11,6 +11,70 @@
     date.strftime("%F")
   end
 
+
+  # Render an html <title> appropriate string for a set of search parameters, based on local requirements
+  #
+  # @param search_state_or_params [Blacklight::SearchState, ActionController::Parameters]
+  # @return [String]
+  # Adapted from https://github.com/projectblacklight/blacklight/blob/main/app/helpers/blacklight/catalog_helper_behavior.rb#L151
+  def render_search_as_breadcrumbs_to_page_title(search_state_or_params)
+    search_state = if search_state_or_params.is_a? Blacklight::SearchState
+      search_state_or_params
+    else
+      controller.search_state_class.new(params, blacklight_config, self)
+    end
+
+    constraints = []
+    suffixes = []
+    prefix = t("blacklight.search.page_title.prefix")
+    add_prefix = true
+
+    if search_state.query_param.present?
+      unless search_state.search_field&.key.blank? || default_search_field?(search_state.search_field.key)
+        q_label = label_for_search_field(search_state.search_field.key)
+      end
+
+      constraints += if q_label.present?
+        [ t("blacklight.search.page_title.constraint", label: q_label, value: search_state.query_param) ]
+      else
+        [ search_state.query_param ]
+      end
+    end
+
+    if search_state.filters.any?
+      repository = collection = nil
+      has_level_collection = false
+
+      search_state.filters.each do |filter|
+        if filter.key == "repository"
+          repository = filter.values.first
+        elsif filter.key == "collection"
+          collection = filter.values.first
+        elsif filter.key == "level"
+          has_level_collection = filter.values.first == "Collection"
+        else
+          constraints << render_search_to_page_title_filter(filter.key, filter.values)
+        end
+      end
+      suffixes << repository unless repository.nil?
+      if collection.nil?
+        suffixes.unshift "Collections" if has_level_collection && suffixes.present?
+      else
+        suffixes.unshift collection
+        add_prefix = constraints.present?
+      end
+    end
+
+    title = []
+    title += [ constraints.join(t('blacklight.search.page_title.joiner')) ] unless constraints.empty?
+    unless suffixes.empty?
+      title << "-" unless title.empty?
+      title << suffixes.join(" - ")
+    end
+    title.unshift prefix if add_prefix
+    title.join(" ")
+  end
+
   # Keys are the display keys registered in the Blacklight config.
   # Fields are the Solr document keys associated with the display keys.
   SKIPPABLE_KEYS = [

app/views/catalog/_search_results.html.erb

@@ -2,7 +2,9 @@
 <%# Last checked for updates: ArcLight v1.6.2. %>
 <%# https://github.com/projectblacklight/arclight/blob/master/app/views/catalog/_search_results.html.erb %>
 
-<% @page_title = t('blacklight.search.page_title.title', constraints: render_search_to_page_title(search_state), application_name: application_name) %>
+<% @page_title = t('blacklight.search.page_title.title',
+                   constraints: render_search_as_breadcrumbs_to_page_title(search_state),
+                   application_name: application_name) %>
 
 <% content_for(:head) do -%>
   <%= render 'catalog/opensearch_response_metadata', response: @response %>

config/locales/arclight.en.yml

@@ -15,6 +15,8 @@ en:
         download:
           pdf: Download PDF Finding Aid
           html: Download HTML Finding Aid
+      repositories:
+        title: Repositories - University of Michigan Finding Aids
     truncation:
       view_less: show less
       view_more: show more

config/locales/blacklight.en.yml

@@ -1,3 +1,8 @@
 en:
   blacklight:
-    application_name: 'Arclight'
+    application_name: 'University of Michigan Finding Aids'
+    search:
+      page_title:
+        title: '%{constraints} - %{application_name}'
+        prefix: 'Results for'
+        joiner: " / "