Data DSL

(ns darkleaf.di.tutorial.o-data-dsl-test
  (:require
   [clojure.test :as t]
   [darkleaf.di.core :as di]))

It is common to use data-DSLs in Clojure, such as reitit routing, and DI offers tools to handle them easily. Here they are: di/template and di/ref.

You can also use di/opt-ref for optional dependencies. If there is no defined key opt-ref resolves to nil.

(def route-data
  (di/template
   [["/"     {:get {:handler (di/ref `root-handler)}}]
    ["/news" {:get {:handler (di/ref `news-handler)}}]]))

(t/deftest template-test
  (letfn [(root-handler [req])
          (news-handler [req])]
    (with-open [root (di/start `route-data {`root-handler root-handler
                                            `news-handler news-handler})]
      (t/is (= [["/"     {:get {:handler root-handler}}]
                ["/news" {:get {:handler news-handler}}]]
               @root)))))