Enable cross-OS compatible fat-jar builds with Gradle's shadowDist ta…

…sks.

build.gradle

@@ -17,6 +17,13 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     compile group: 'org.apache.pdfbox', name: 'pdfbox', version: '2.0.15'
     compile group: 'com.jfoenix', name: 'jfoenix', version: '9.0.8'
+
+    // cross-platform jar: https://github.com/openjfx/samples/blob/master/CommandLine/Non-modular/Gradle/hellofx/build.gradle
+    // enable these when doing Gradle's shadowDistZip
+    //   for cross-OS compatibility
+    compile "org.openjfx:javafx-graphics:12.0.1:win"
+    compile "org.openjfx:javafx-graphics:12.0.1:linux"
+    compile "org.openjfx:javafx-graphics:12.0.1:mac"
 }
 
 compileKotlin {
@@ -31,4 +38,7 @@ javafx {
     modules = [ 'javafx.controls', 'javafx.fxml' ]
 }
 
-mainClassName = 'org.idiosapps.MainApp'
+application {
+    mainClassName = 'org.idiosapps.Main'
+    applicationName = 'gradedReaderBuilder'
+}

src/main/kotlin/org/idiosapps/Main.kt

@@ -0,0 +1,14 @@
+package org.idiosapps
+
+// https://stackoverflow.com/a/34833438/4261132
+// To make a fat jar with JavaFX,
+//    we can't have the MainClass extend Application
+// So, unfortunately we have to hack 2 static methods to get to the app!
+class Main {
+    companion object{
+        @JvmStatic
+        fun main(args: Array<String>) {
+            MainApp.main(args)
+        }
+    }
+}

src/main/kotlin/org/idiosapps/MainApp.kt

@@ -20,4 +20,11 @@ class MainApp : Application() {
         stage.scene = scene
         stage.show()
     }
+
+    companion object{
+        @JvmStatic
+        fun main(args: Array<String>) {
+            launch(MainApp::class.java)
+        }
+    }
 }