CSS helper that inserts small files as data URIs

sprockets_asset_uri.rb

# Monkey-patch another helper into Sprockets that expands small files
# into data URIs.
module Sprockets
  class Context
    def asset_uri(path)
      fullpath  = environment.find_asset(path)
      if fullpath && File.file?(fullpath) && File.size(fullpath) < 2048
        asset_data_uri(path)
      else
        path
      end
    end
  end
end