Draft: Introduce basic Kotlin MPP project layout

build.gradle.kts

@@ -16,33 +16,27 @@
 
 */
 
+import com.charleskorn.kaml.build.Versions
 import com.charleskorn.kaml.build.configureAssemble
 import com.charleskorn.kaml.build.configureJacoco
 import com.charleskorn.kaml.build.configurePublishing
 import com.charleskorn.kaml.build.configureSpotless
 import com.charleskorn.kaml.build.configureTesting
 import com.charleskorn.kaml.build.configureVersioning
 import com.charleskorn.kaml.build.configureWrapper
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 buildscript {
     repositories {
         jcenter()
     }
-
-    dependencies {
-        classpath(kotlin("serialization", version = "1.4.10"))
-    }
 }
 
 plugins {
-    kotlin("jvm") version "1.4.10"
-
-    apply { id("com.github.ben-manes.versions") version "0.36.0" }
+    kotlin("multiplatform") version "1.4.10"
+    id("org.jetbrains.kotlin.plugin.serialization") version "1.4.10"
+    id("com.github.ben-manes.versions") version "0.36.0"
 }
 
-apply(plugin = "kotlinx-serialization")
-
 group = "com.charleskorn.kaml"
 
 repositories {
@@ -51,28 +45,49 @@ repositories {
     maven(url = "https://kotlin.bintray.com/kotlinx")
 }
 
-dependencies {
-    implementation(platform("org.jetbrains.kotlin:kotlin-bom"))
-
-    implementation(kotlin("stdlib-jdk8"))
-    implementation(group = "org.snakeyaml", name = "snakeyaml-engine", version = "2.2.1")
-    implementation(group = "org.jetbrains.kotlinx", name = "kotlinx-serialization-core", version = "1.0.1")
-
-    val spekVersion = "2.0.15"
-
-    testImplementation(group = "org.spekframework.spek2", name = "spek-dsl-jvm", version = spekVersion)
-    testImplementation(group = "ch.tutteli.atrium", name = "atrium-fluent-en_GB", version = "0.15.0")
-
-    testRuntimeOnly(group = "org.spekframework.spek2", name = "spek-runner-junit5", version = spekVersion)
-}
-
-tasks.withType<KotlinCompile> {
-    kotlinOptions.jvmTarget = "1.8"
-    kotlinOptions.freeCompilerArgs = listOf("-Xuse-experimental=kotlin.RequiresOptIn")
-}
-
 kotlin {
     explicitApi()
+
+    jvm {
+        withJava()
+        compilations.all {
+            kotlinOptions {
+                jvmTarget = "1.8"
+            }
+        }
+    }
+
+    sourceSets {
+        all {
+            languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
+        }
+        val commonMain by getting {
+            dependencies {
+                implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:${Versions.serialization}")
+            }
+        }
+        val commonTest by getting {
+            dependencies {
+                implementation("org.spekframework.spek2:spek-dsl-metadata:${Versions.spek}")
+                implementation("ch.tutteli.atrium:atrium-fluent-en_GB-common:${Versions.atrium}")
+            }
+        }
+        val jvmMain by getting {
+            dependencies {
+                implementation(project.dependencies.platform("org.jetbrains.kotlin:kotlin-bom"))
+                implementation(kotlin("stdlib-jdk8"))
+                implementation("org.snakeyaml:snakeyaml-engine:${Versions.snakeYaml}")
+                implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:${Versions.serialization}")
+            }
+        }
+        val jvmTest by getting {
+            dependencies {
+                implementation("org.spekframework.spek2:spek-dsl-jvm:${Versions.spek}")
+                implementation("ch.tutteli.atrium:atrium-fluent-en_GB:${Versions.atrium}")
+                runtimeOnly("org.spekframework.spek2:spek-runner-junit5:${Versions.spek}")
+            }
+        }
+    }
 }
 
 configureAssemble()

buildSrc/src/main/kotlin/com/charleskorn/kaml/build/Versions.kt

@@ -0,0 +1,26 @@
+/*
+
+   Copyright 2018-2020 Charles Korn.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+*/
+
+package com.charleskorn.kaml.build
+
+object Versions {
+    const val atrium = "0.15.0"
+    const val serialization = "1.0.1"
+    const val snakeYaml = "2.2.1"
+    const val spek = "2.0.15"
+}

src/test/kotlin/com/charleskorn/kaml/Assertions.kt → src/commonTest/kotlin/com/charleskorn/kaml/Assertions.kt

@@ -20,6 +20,7 @@ package com.charleskorn.kaml
 
 import ch.tutteli.atrium.api.fluent.en_GB.feature
 import ch.tutteli.atrium.creating.Expect
+import kotlin.jvm.JvmName
 
 fun <T : YamlException> Expect<T>.path(assertionCreator: Expect<YamlPath>.() -> Unit) {
     feature(YamlException::path).addAssertionsCreatedBy(assertionCreator)