// MapEncoder intercepts the request's URL, detects the requested format,
// and injects the correct encoder dependency for this request. It rewrites
// the URL to remove the format extension, so that routes can be defined
// without it.
func MapEncoder(c martini.Context, w http.ResponseWriter, r *http.Request, p *models.Page) {
// Get the format extension
matches := rxExt.FindStringSubmatch(r.URL.Path)
ft := ".html"
if len(matches) > 1 {
// Rewrite the URL without the format extension
l := len(r.URL.Path) - len(matches[1])
if strings.HasSuffix(r.URL.Path, "/") {
l--
}
r.URL.Path = r.URL.Path[:l]
ft = matches[1]
}
// Inject the requested encoder
switch ft {
case ".json":
p.SetEncoding("json")
default:
p.SetEncoding("html")
}
}