module Sinatra::ConfigFile

def config_file(*paths)

these +paths+ can actually be globs.
arguments, filtering the settings for the current environment. Note that
Loads the configuration from the YAML files whose +paths+ are passed as 
def config_file(*paths)
  Dir.chdir(root || '.') do
    paths.each do |pattern|
      Dir.glob(pattern) do |file|
        raise UnsupportedConfigType unless ['.yml', '.yaml', '.erb'].include?(File.extname(file))
        logger.info "loading config file '#{file}'" if logging? && respond_to?(:logger)
        document = ERB.new(File.read(file)).result
        yaml = YAML.respond_to?(:unsafe_load) ? YAML.unsafe_load(document) : YAML.load(document)
        config = config_for_env(yaml)
        config.each_pair { |key, value| set(key, value) }
      end
    end
  end
end