module Roda::RodaPlugins::ViewOptions::InstanceMethods

def template_name(opts)

contain a slash.
there is a view subdirectory and the template name does not
Override the template name to use the view subdirectory if the
def template_name(opts)
  name = super
  if (v = @_view_subdir) && name !~ /\//
    "#{v}/#{name}"
  else
    name
  end
end