Merge pull request #2010 from samvera/adding-knapsack-handling-for-files

♻️ Add handling for Knapsack theme overrides

app/controllers/hyrax/admin/appearances_controller.rb

@@ -16,8 +16,8 @@ def show
         add_breadcrumbs
         @form = form_class.new
         @fonts = [@form.headline_font, @form.body_font]
-        @home_theme_information = YAML.load_file('config/home_themes.yml')
-        @show_theme_information = YAML.load_file('config/show_themes.yml')
+        @home_theme_information = YAML.load_file(Hyku::Application.path_for('config/home_themes.yml'))
+        @show_theme_information = YAML.load_file(Hyku::Application.path_for('config/show_themes.yml'))
         @home_theme_names = load_home_theme_names
         @show_theme_names = load_show_theme_names
         @search_themes = load_search_themes

config/application.rb

@@ -38,6 +38,22 @@ class Application < Rails::Application
     # IiifPrint::SplitPdfs::AdventistPagesToJpgsSplitter
     config.autoload_paths.unshift("#{Rails.root}/lib")
 
+    ##
+    # @api public
+    #
+    # @param relative_path [String] lookup the relative paths first in the Knapsack then in Hyku.
+    #
+    # @return [String] the path to the file, favoring those found in the knapsack but falling back
+    #         to those in the Rails.root.
+    def self.path_for(relative_path)
+      if defined?(HykuKnapsack)
+        engine_path = HykuKnapsack::Engine.root.join(relative_path)
+        return engine_path.to_s if engine_path.exist?
+      end
+
+      Rails.root.join(relative_path).to_s
+    end
+
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.