Change some production stuff on the window

- check automatically if on dev or prod (jar) environement
- choose local port automatically.

src/main/kotlin/org/levi/coffee/Window.kt

@@ -2,6 +2,7 @@ package org.levi.coffee
 
 
 import dev.webview.Webview
+import io.ktor.network.sockets.*
 import io.ktor.server.engine.*
 import io.ktor.server.http.content.*
 import io.ktor.server.netty.*
@@ -11,14 +12,18 @@ import org.levi.coffee.internal.MethodBinder
 import org.levi.coffee.internal.util.FileUtil
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
+import java.net.ServerSocket
 import java.util.*
 import java.util.function.Consumer
-import kotlin.collections.ArrayList
 import kotlin.system.exitProcess
 
-class Window(val dev: Boolean = true, val args: Array<String>) {
+class Window(val args: Array<String>) {
     private val log: Logger = LoggerFactory.getLogger(this::class.java)
-
+    private val dev = run {
+        val className: String = Window::class.java.getName().replace('.', '/')
+        val classJar: String = Window::class.java.getResource("/$className.class")?.toString() ?: ""
+        classJar.startsWith("jar:")
+    }
     private val _beforeStartCallbacks: MutableList<Runnable> = ArrayList()
     private val _onCloseCallbacks: MutableList<Runnable> = ArrayList()
     private val _bindObjects = ArrayList<Any>()
@@ -112,7 +117,9 @@ class Window(val dev: Boolean = true, val args: Array<String>) {
 
         var server: NettyApplicationEngine? = null
         if (!dev) {
-            val prodPort = 4567
+            val s = ServerSocket(0);
+            val prodPort = s.localPort
+            s.close()
             server = embeddedServer(Netty, port = prodPort, host = "localhost") {
                 routing {
                     staticResources("/", "dist") {