Hot reload clojure code in figwheel-main

web.core.clj

;; Based on https://figwheel.org/docs/your_own_server.html. Just add reload middleware and wrap (run-jetty) in a (future)
;; And run it:
;; clojure -i @web/core.clj -m figwheel.main -b dev -r

(ns web.core
  (:require [ring.adapter.jetty :refer [run-jetty]]
            [ring.middleware.defaults :refer [wrap-defaults site-defaults]]
            [ring.middleware.reload :refer [wrap-reload]]
            [ring.util.response :refer [resource-response content-type]]))

(defn handler [req]
  (or
   (when (= "/" (:uri req))
     (some-> (resource-response "index.html" {:root "public"})
             (content-type "text/html; charset=utf-8"))) 
   {:status 404
    :headers {"Content-Type" "text/html"}
    :body "Not found!"}))

(def app
  (-> handler
      wrap-reload
      (wrap-defaults site-defaults)))

(future
  (run-jetty
   app
   {:port 4000}))