Refactor Gradle config and move jvmTarget to properties

Author: ileasile

build.gradle.kts

@@ -13,11 +13,6 @@ plugins {
     id("com.github.johnrengelman.shadow")
 }
 
-val compileKotlin: KotlinCompile by tasks
-compileKotlin.kotlinOptions {
-    languageVersion = "1.4"
-}
-
 class TaskOptions: AllOptions {
     override val versionFileName = "VERSION"
     override val rootPath: Path = rootDir.toPath()
@@ -148,6 +143,16 @@ class TaskOptions: AllOptions {
 }
 
 allprojects {
+    val kotlinLanguageLevel: String by rootProject
+    val jvmTarget: String by rootProject
+
+    tasks.withType(KotlinCompile::class.java).all {
+        kotlinOptions {
+            languageVersion = kotlinLanguageLevel
+            this.jvmTarget = jvmTarget
+        }
+    }
+
     repositories {
         jcenter()
         mavenLocal()

buildSrc/build.gradle.kts

@@ -7,8 +7,3 @@ plugins {
 repositories {
     jcenter()
 }
-
-val compileKotlin: KotlinCompile by tasks
-compileKotlin.kotlinOptions {
-    languageVersion = "1.4"
-}

gradle.properties

@@ -1,5 +1,7 @@
 # kotlinVersion=1.4-SNAPSHOT
 kotlinVersion=1.4.0-dev-7446
+kotlinLanguageLevel=1.4
+jvmTarget=1.8
 
 shadowJarVersion=5.2.0
 baseVersion=0.7.41

jupyter-lib/build.gradle.kts

@@ -9,8 +9,3 @@ dependencies {
     testImplementation("junit:junit:4.12")
     testImplementation(kotlinDep("kotlin-test"))
 }
-
-val compileKotlin: org.jetbrains.kotlin.gradle.tasks.KotlinCompile by tasks
-compileKotlin.kotlinOptions {
-    languageVersion = "1.4"
-}