1 files changed, 57 insertions, 0 deletions
diff --git a/src/main/scala/byspel/app/App.scala b/src/main/scala/byspel/app/App.scala
new file mode 100644
index 0000000..65b3c3f
--- /dev/null
+++ b/src/main/scala/byspel/app/App.scala
@@ -0,0 +1,57 @@
+package byspel
+package app
+
+import akka.actor.ActorSystem
+import akka.stream.{ActorMaterializer, Materializer}
+import java.nio.file.{Files, Paths}
+import scala.concurrent.ExecutionContext
+import toml.Toml
+
+trait App {
+
+  implicit lazy val system: ActorSystem = ActorSystem()
+
+  implicit lazy val materializer: Materializer = ActorMaterializer()
+
+  implicit lazy val executionContext: ExecutionContext = system.dispatcher
+
+  def start(): Unit = {}
+  def stop(): Unit = {}
+
+  def log(msg: String) = System.err.println(msg)
+
+  private var _args: List[String] = Nil
+  def args = _args
+
+  lazy val config = args match {
+    case Nil =>
+      log("fatal: no config file given as first argument")
+      sys.exit(1)
+    case head :: _ if Files.isReadable(Paths.get(head)) =>
+      log(s"loading config from '${args(0)}'")
+      import toml.Codecs._
+      Toml.parseAs[Config](Files.readString(Paths.get(head))) match {
+        case Left(err) =>
+          log(s"fatal: syntax error in config file: $err")
+          sys.exit(1)
+        case Right(value) => value
+      }
+    case head :: _ =>
+      log(s"fatal: config file '$head' is not readable or does not exist")
+      sys.exit(1)
+  }
+
+  def main(args: Array[String]): Unit = {
+    log("starting application")
+    _args = args.toList
+    config
+    sys.addShutdownHook {
+      log("stopping application")
+      stop()
+      log("bye")
+    }
+    start()
+    log("ready")
+  }
+
+}