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+(ns bbbg.core
+  (:gen-class)
+  (:require
+   [bbbg.db :as db]
+   [bbbg.web :as web]
+   [clojure.spec.alpha :as s]
+   [clojure.spec.test.alpha :as stest]
+   [com.stuartsierra.component :as component]
+   [expound.alpha :as exp]))
+
+(s/def ::config
+  (s/merge
+   ::db/config
+   ::web/config))
+
+(defn make-system [config]
+  (component/system-map
+   :db (db/make-database config)
+   :web (web/make-server config)))
+
+(defn env->config []
+  (s/assert
+   ::config
+   (merge
+    (db/env->config)
+    (web/env->config))))
+
+(defn dev-config []
+  (s/assert
+   ::config
+   (merge
+    (db/dev-config)
+    (web/dev-config))))
+
+(defonce system nil)
+
+(defn init-dev []
+  (s/check-asserts true)
+  (set! s/*explain-out* exp/printer)
+  (stest/instrument))
+
+(defn run-dev []
+  (init-dev)
+  (alter-var-root
+   #'system
+   (fn [sys]
+     (when sys
+       (component/start sys))
+     (component/start (make-system (dev-config))))))
+
+(defn -main [& _args]
+  (alter-var-root
+   #'system
+   (constantly (component/start (make-system (env->config))))))
+
+(comment
+  ;; To run the application:
+  ;; 1. `M-x cider-jack-in`
+  ;; 2. `M-x cider-load-buffer` in this buffer
+  ;; 3. (optionally) configure the secrets backend in `bbbg.util.dev-secrets`
+  ;; 4. Put your cursor after the following form and run `M-x cider-eval-last-sexp`
+  ;;
+  ;; A web server will be listening on http://localhost:8888
+
+  (do
+    (run-dev)
+    (bbbg.db/migrate! (:db system)))
+
+  )