(html/deftemplate base (str template-path "signup.html")
                    [{:keys [content]}]
                    [:#title] (html/content "title one")
                    [:#content] (util/maybe-substitute content)
                    )
(html/deftemplate base-two (str template-path "signup.html")
                    [{:keys [content]}]
                    [:#title] (html/content "title two")
                    [:#content] (util/maybe-substitute content)
                    )

(def base-template (base {:title "title"}))

;does not work, how to do it right?
(alter-var-root #'base-template #((base-two) {:content "base two"}))