Add GraalVM native-image configuration

build.gradle.kts

@@ -1,7 +1,7 @@
-
 plugins {
     java
-    id("org.jetbrains.kotlin.jvm") version "1.6.0"
+    id("org.jetbrains.kotlin.jvm") version "1.6.10"
+    id("org.graalvm.buildtools.native") version "0.9.9"
     application
 }
 
@@ -11,9 +11,23 @@ repositories {
 
 dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0")
 }
 
 application {
     mainClass.set("lv.n3o.aoc2021.Main")
+}
+
+tasks.named("run").configure {
+    outputs.upToDateWhen { false }
+}
+
+graalvmNative {
+    binaries {
+        named("main") {
+            agent {
+                enabled.set(true)
+            }
+        }
+    }
 }

readme.md

@@ -4,4 +4,6 @@ See [AoC 2021](https://adventofcode.com/2021/) for puzzles.
 
 Inputs are usually defined in input files in `src/main/resources/` (`i{nn}.txt` wheren `{nn}` is 0-padded day number).
 
-To run all, use `./gradlew run` (or `gradlew.bat run` on Windows)
+To run all, use `./gradlew run` (or `gradlew.bat run` on Windows)
+
+To compile native image using GraalVM, run `nativeCompile` task. Result will be placed in `build/native/nativeCompile/`

settings.gradle.kts

@@ -0,0 +1,7 @@
+pluginManagement {
+    repositories {
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+rootProject.name = "aoc2021"

src/main/kotlin/lv/n3o/aoc2021/Task.kt

@@ -39,7 +39,7 @@ abstract class Input {
 
 class ClasspathInput(val name: String) : Input() {
     override fun readInput(): String {
-        with(this::class.java.classLoader.getResourceAsStream(name)!!) {
+        with(javaClass.getResourceAsStream(name) ?: ClassLoader.getSystemClassLoader().getResourceAsStream(name)) {
             return bufferedReader(Charsets.UTF_8).readText()
         }
     }

src/main/kotlin/lv/n3o/aoc2021/main.kt

@@ -17,7 +17,7 @@ private const val REPEAT_RUNS = 1
 private fun ci(number: Int, expectedA: String, expectedB: String): TestCase {
     val paddedNumber = "$number".padStart(2, '0')
     val className = "T$paddedNumber"
-    val inputFile = "i$paddedNumber.txt"
+    val inputFile = "/i$paddedNumber.txt"
     val taskClass = Class.forName("lv.n3o.aoc2021.tasks.$className")
     val constructor: (Input) -> Task =
         { input -> taskClass.getConstructor(Input::class.java).newInstance(input) as Task }