Start electron dev env with one cmd

Thanks @borkdude for the gist :)

bb.edn

@@ -7,4 +7,16 @@
   logseq.tasks.lang/lang-missing
 
   lang:invalid
-  logseq.tasks.lang/lang-invalid}}
+  logseq.tasks.lang/lang-invalid
+
+  dev:watch
+  logseq.tasks.dev/watch
+
+  dev:open-dev-electron-app
+  logseq.tasks.dev/open-dev-electron-app
+
+  -dev:electron-dev
+  {:depends [dev:watch dev:open-dev-electron-app]}
+
+  dev:electron-dev
+  logseq.tasks.dev/electron-dev}}

scripts/src/logseq/tasks/dev.clj

@@ -0,0 +1,33 @@
+(ns logseq.tasks.dev
+  "Tasks for development"
+  (:require [babashka.fs :as fs]
+            [babashka.tasks :refer [shell]]))
+
+(defn watch
+  "Watches environment to reload cljs, css and other assets"
+  []
+  (shell "yarn watch"))
+
+(defn- file-modified-later-than?
+  [file comparison-instant]
+  (pos? (.compareTo (fs/file-time->instant (fs/last-modified-time file))
+                    comparison-instant)))
+
+;; Works whether yarn clean has been run before or not
+(defn open-dev-electron-app
+  "Opens dev-electron-app when watch process has built main.js"
+  []
+  (let [start-time (java.time.Instant/now)]
+    (dotimes [_n 1000]
+             (if (and (fs/exists? "static/js/main.js")
+                      (file-modified-later-than? "static/js/main.js" start-time))
+               (shell "yarn dev-electron-app")
+               (println "Waiting for app to build..."))
+             (Thread/sleep 1000))))
+
+;; Thanks to https://gist.github.com/borkdude/35bc0a20bd4c112dec2c5645f67250e3
+;; for this idea
+(defn electron-dev
+  "Start electron dev that includes watching assets and opening dev app"
+  []
+  (shell "bb run --parallel -dev:electron-dev"))