Templ and Formam handler creation function.

example.go

func FormHandler[T any](f func(T) templ.Component) http.Handler {
	return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		req.ParseForm()

		var data T
		d := formam.NewDecoder(nil)
		d.Decode(req.Form, &data)
		// TODO: Handle errors.

		templ.Handler(f(data)).ServeHTTP(rw, req)
	})
}