extractor

type Context interface {
	File() *stingray.File
	Runner() *exec.Runner
	Config() map[string]string
	GetResource(name, typ stingray.Hash) (file *stingray.File, exists bool)
	// Call WriteCloser.Close() when done.
	CreateFile(suffix string) (io.WriteCloser, error)
	// Call WriteCloser.Close() when done.
	CreateFileDir(dirSuffix, filename string) (io.WriteCloser, error)
	OutPath() (string, error)
}

type ExtractFunc func(ctx Context) error