module HTTP::MimeType

def [](type)
  adapters[normalize type] || raise(Error, "Unknown MIME type: #{type}")
end

def adapters
  @adapters ||= {}
end

def aliases
  @aliases ||= {}
end

def normalize(type)
  aliases.fetch type, type.to_s
end

def register_adapter(type, adapter)
  adapters[type.to_s] = adapter
end

def register_alias(type, shortcut)
  aliases[shortcut.to_sym] = type.to_s
end