custom middleware for martini

main.go

func Vermut() *martini.ClassicMartini {
	r := martini.NewRouter()
	m := martini.New()
	m.Use(martini.Logger())
	m.Use(martini.Recovery())
	
	// pass cached images to thumbnailer
	m.Use(NewThumbnailer("public"))
    cache := martini.NewRouter()
    cache.Group("/cache", cacheHandler)
    cache.NotFound(func() {})
    m.Use(cache.Handle)

  // then serve generated (and not) thumbs by static
	m.Use(martini.Static("public"))
	m.MapTo(r, (*martini.Routes)(nil))
	m.Action(r.Handle)
	return &martini.ClassicMartini{m, r}
}