dev: hot reloading

- add start/stop/restart/watch functions in 'user namespace (dev
profile)
- add lein alias `dev` that starts file watcher and REPL
- every time source code is changed, `lein dev` reloads modified
namespaces and restarts system
- add `lein dev` to Contributors' Guide

1 files changed, 27 insertions, 0 deletions

diff --git a/dev/user.clj b/dev/user.clj
new file mode 100644
index 0000000..2ebcdb0
--- /dev/null
+++ b/dev/user.clj
@@ -0,0 +1,27 @@
+(ns user
+  (:require [clj-reload.core :as reload]
+            [nextjournal.beholder :as beholder]
+            [weepinbell.core]))
+
+(reload/init
+  {:dirs ["src" "dev" "test"]})
+
+(defonce stop-fn (atom nil))
+
+(defn start []
+  {:pre [(nil? @stop-fn)]}
+  (reset! stop-fn (@(resolve 'weepinbell.core/start-system))))
+
+(defn stop []
+  {:pre [(fn? @stop-fn)]}
+  (@stop-fn)
+  (reset! stop-fn nil))
+
+(defn restart []
+  (stop)
+  (reload/reload)
+  (start))
+
+(defn watch []
+  (beholder/watch (fn [_] ((requiring-resolve 'user/restart))) "src"))
+