class Rails::Application::Configuration

def gem_extensions


TrustyCms.configuration.gem_extensions # => [:name, :name]

and returns a list of their names as symbols.
Scans the bundled gems for any whose name match the +radiant-something-extension+ format 
def gem_extensions
  Gem.loaded_specs.each_with_object([]) do |(gemname, gemspec), found|
    if gemname =~ /trusty-.*-extension$/
      ep = TrustyCms::ExtensionLoader.record_path(gemspec.full_gem_path, gemname)
      found << ep.name
    end
  end
end