type AliasNode struct {
	Permalink string
	Page      interface{}
}

type AliasPublisher interface {
	Translator
	Publish(path string, permalink string, page interface{}) error
}

type Filesystem struct {
	PublishDir string
}

type HTMLRedirectAlias struct {
	PublishDir string
	Templates  *template.Template
	AllowRoot  bool // for the language redirects
}

type InMemoryTarget struct {
	Files map[string][]byte
}

type OptionalTranslator interface {
	TranslateRelative(string) (string, error)
}

type Output interface {
	Publisher
	Translator
}

type PagePub struct {
	UglyURLs         bool
	DefaultExtension string
	PublishDir       string

	// LangDir will contain the subdir for the language, i.e. "en", "de" etc.
	// It will be empty if the site is rendered in root.
	LangDir string
}

type PagePublisher interface {
	Translator
	Publish(string, template.HTML) error
}

type Publisher interface {
	Publish(string, io.Reader) error
}

type Translator interface {
	Translate(string) (string, error)
}