module Roda::RodaPlugins::Assets::InstanceMethods

def render_asset(file, type)

this will return a 304 response.
In both cases, if the file has not been modified since the last request,
this will render the asset using the render plugin.
When assets are not compiled and the file is not already in the same format,
this returns the contents of the compiled file.
or when the file is already of the given type (no rendering necessary),
Render the asset with the given filename. When assets are compiled, 
def render_asset(file, type)
  o = self.class.assets_opts
  if o[:compiled]
    file = "#{o[:"compiled_#{type}_path"]}#{file}"
    if o[:gzip] && env['HTTP_ACCEPT_ENCODING'] =~ /\bgzip\b/
      @_response['Content-Encoding'] = 'gzip'
      file += '.gz'
    end
    check_asset_request(file, type, ::File.stat(file).mtime)
    ::File.read(file)
  else
    file = "#{o[:"#{type}_path"]}#{file}"
    check_asset_request(file, type, asset_last_modified(file))
    read_asset_file(file, type)
  end
end