Asset and AssetNames render.Options fields

[errashe]

package main

import . "fmt"
import "io"

import "github.com/labstack/echo"
import "github.com/gobuffalo/packr"
import "github.com/unrolled/render"

var box packr.Box

type RenderWrapper struct { // We need to wrap the renderer because we need a different signature for echo.
	rnd *render.Render
}

func NewRender(ro render.Options) *RenderWrapper {
	return &RenderWrapper{render.New(ro)}
}

func (r *RenderWrapper) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
	return r.rnd.HTML(w, 0, name, data) // The zero status code is overwritten by echo.
}

var ro render.Options = render.Options{
	Asset: func(name string) ([]byte, error) {
		Println("A")
		return box.MustBytes(Sprintf("%s.tmpl", name))
	},
	AssetNames: func() []string {
		return box.List()
	},
}

func main() {
	box = packr.NewBox("./html")
	r := NewRender(ro)
	e := echo.New()

	e.Renderer = r

	e.GET("/", func(c echo.Context) error {
		return c.Render(200, "main", nil)
	})

	Println(e.Start(":1323"))
}

Won't work: html/template: "main" is undefined.
But box.MustBytes("main.tmpl") returns bytes from file. No additional docs found (or i can't). What i doing wrong?

[errashe]

Actually, i found solution. In function, which one should check existing those templates there is a mistake: empty Templates directory fills with templates string. And when parsing templates - just skiping them all, cuz they don't have substring with this templates string. So, i need to add substring to my AssetNames function to make sure, what everything works properly.

AssetNames: func() []string {
	var ret []string
	for _, el := range box.List() {
		ret = append(ret, Sprintf("/%s", el))
	}
	return ret
},
Directory:  "/",

And everything works as expected.