module Roda::RodaPlugins::AssetsPreloading::InstanceMethods

def _preload_assets_array(assets)

types and/or groups.
Return an array of paths/as pairs for the given asset 
def _preload_assets_array(assets)
  assets.map do |type|
    paths = assets_paths(type)
    type = type[0] if type.is_a?(Array)
    as = TYPE_AS[type]
    paths.map{|path| [path, as]}
  end.flatten(1)
end

def preload_assets_link_header(*args)

given asset types/groups.
Return a string suitable for a Link header for the 
def preload_assets_link_header(*args)
  _preload_assets_array(args).map{|path, as| "<#{path}>;rel=preload;as=#{as}"}.join(",")
end

def preload_assets_link_tags(*args)

types/groups.
Return a string of tags for the given asset 
def preload_assets_link_tags(*args)
  _preload_assets_array(args).map{|path, as| "<link href=\"#{h(path)}\" rel=\"preload\" as=\"#{as}\">"}.join("\n")
end