From 20784c9fe1abdd205ecbadc0151bcc53e52482f4 Mon Sep 17 00:00:00 2001
From: Jendrik Johannes <jendrik.johannes@gmail.com>
Date: Wed, 6 Nov 2024 09:28:05 +0100
Subject: [PATCH] Add Convention Plugins for Kotlin

---
 app/build.gradle.kts                          |  5 +++--
 bespin/build.gradle.kts                       |  1 +
 corellia/build.gradle.kts                     |  1 +
 coruscant/build.gradle.kts                    |  1 +
 gradle.properties                             |  3 +++
 gradle/libs.versions.toml                     |  2 ++
 gradle/plugins/build.gradle.kts               |  1 +
 ...rg.example.gradle.base.identity.gradle.kts |  2 +-
 ...mple.gradle.check.format-kotlin.gradle.kts |  6 ++++++
 ...le.gradle.component.application.gradle.kts |  2 ++
 ...xample.gradle.component.library.gradle.kts |  2 ++
 ...e.gradle.feature.compile-kotlin.gradle.kts | 19 +++++++++++++++++++
 kamino/build.gradle.kts                       |  1 +
 kashyyyk/build.gradle.kts                     |  1 +
 naboo/build.gradle.kts                        |  1 +
 tatooine/build.gradle.kts                     |  1 +
 16 files changed, 46 insertions(+), 3 deletions(-)
 create mode 100644 gradle/plugins/src/main/kotlin/org.example.gradle.check.format-kotlin.gradle.kts
 create mode 100644 gradle/plugins/src/main/kotlin/org.example.gradle.feature.compile-kotlin.gradle.kts

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 30c90727..88ec3f5f 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -11,16 +11,17 @@ dependencies {
     implementation(projects.tatooine)
     implementation(libs.guice)
     implementation(libs.guice.servlet)
+    implementation(libs.kotlin.stdlib)
     implementation(libs.slf4j.api)
     runtimeOnly(libs.slf4j.simple)
     providedCompile(libs.jakarta.servlet.api)
 
+    mockApiApi(libs.guava)
     mockApiImplementation(projects.app)
-    mockApiImplementation(libs.guava)
 
     testImplementation(libs.junit.jupiter.api)
 
+    testEndToEndApi(libs.junit.jupiter.api)
     testEndToEndImplementation(projects.app) { capabilities { requireFeature("mock-api") } }
     testEndToEndImplementation(libs.guava)
-    testEndToEndImplementation(libs.junit.jupiter.api)
 }
diff --git a/bespin/build.gradle.kts b/bespin/build.gradle.kts
index e5c62a61..d70173c4 100644
--- a/bespin/build.gradle.kts
+++ b/bespin/build.gradle.kts
@@ -2,6 +2,7 @@ plugins { id("org.example.gradle.component.library") }
 
 dependencies {
     api(projects.corellia)
+    api(libs.kotlin.stdlib)
     implementation(projects.coruscant)
     implementation(libs.velocity.engine.core)
 
diff --git a/corellia/build.gradle.kts b/corellia/build.gradle.kts
index a3875d4c..a36f9702 100644
--- a/corellia/build.gradle.kts
+++ b/corellia/build.gradle.kts
@@ -4,6 +4,7 @@ plugins {
 }
 
 dependencies {
+    api(libs.kotlin.stdlib)
     api(libs.poi)
     implementation(libs.commons.io)
     implementation(libs.poi.ooxml)
diff --git a/coruscant/build.gradle.kts b/coruscant/build.gradle.kts
index 71bb66bd..2aa5bc63 100644
--- a/coruscant/build.gradle.kts
+++ b/coruscant/build.gradle.kts
@@ -8,6 +8,7 @@ dependencies {
     api(libs.jackson.annotations)
     api(libs.jackson.databind)
     api(libs.jakarta.inject.api)
+    api(libs.kotlin.stdlib)
     api(libs.opensaml)
     api(libs.org.json)
     implementation(libs.httpcomponents.fluent.hc)
diff --git a/gradle.properties b/gradle.properties
index 2d9e02e4..2f8c55cc 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,3 +8,6 @@ org.gradle.configuration-cache=true
 
 # activate Gradle build cache - switch between branches/commits without rebuilding every time
 org.gradle.caching=true
+
+# control Kotlin standard library dependencies (and their scope) ourselves
+kotlin.stdlib.default.dependency=false
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index bf943923..d05d4636 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -39,6 +39,8 @@ jakarta-mail-impl = { module = "com.sun.mail:jakarta.mail", version.ref = "jakar
 jakarta-servlet-api = { module = "jakarta.servlet:jakarta.servlet-api", version.ref = "jakarta-servlet" }
 jsr305 = { module = "com.google.code.findbugs:jsr305", version.ref = "jsr305" }
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit5" }
+kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib" }
+kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test" }
 opensaml = { module = "org.opensaml:opensaml", version.ref = "opensaml" }
 org-json = { module = "org.json:json", version.ref = "org-json" }
 org-reflections = { module = "org.reflections:reflections", version.ref = "org-reflections" }
diff --git a/gradle/plugins/build.gradle.kts b/gradle/plugins/build.gradle.kts
index e9e5aff8..d7aa1d4a 100644
--- a/gradle/plugins/build.gradle.kts
+++ b/gradle/plugins/build.gradle.kts
@@ -9,6 +9,7 @@ dependencies {
     implementation("io.fuchs.gradle.classpath-collision-detector:classpath-collision-detector:1.0.0")
     implementation("org.cyclonedx:cyclonedx-gradle-plugin:1.10.0")
     implementation("org.gradlex:jvm-dependency-conflict-resolution:2.1.2")
+    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20")
 }
 
 testing.suites.named<JvmTestSuite>("test") {
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.base.identity.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.base.identity.gradle.kts
index be33eaaf..6f5800c5 100644
--- a/gradle/plugins/src/main/kotlin/org.example.gradle.base.identity.gradle.kts
+++ b/gradle/plugins/src/main/kotlin/org.example.gradle.base.identity.gradle.kts
@@ -2,7 +2,7 @@ plugins { id("org.gradle.base") }
 
 // Set the group required to refer to a Module "from outside".
 // I.e., when it is published or used in Included Builds.
-group = "org.example.product.java"
+group = "org.example.product.kotlin"
 
 // Set the version from 'version.txt'
 version = providers.fileContents(isolated.rootProject.projectDirectory.file("gradle/version.txt")).asText.getOrElse("")
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.check.format-kotlin.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.check.format-kotlin.gradle.kts
new file mode 100644
index 00000000..dc5bc9ba
--- /dev/null
+++ b/gradle/plugins/src/main/kotlin/org.example.gradle.check.format-kotlin.gradle.kts
@@ -0,0 +1,6 @@
+plugins {
+    id("com.diffplug.spotless")
+    id("org.example.gradle.base.lifecycle")
+}
+
+spotless { kotlin { ktfmt().kotlinlangStyle() } }
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.component.application.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.component.application.gradle.kts
index 6cd73278..b09e7a18 100644
--- a/gradle/plugins/src/main/kotlin/org.example.gradle.component.application.gradle.kts
+++ b/gradle/plugins/src/main/kotlin/org.example.gradle.component.application.gradle.kts
@@ -6,8 +6,10 @@ plugins {
     id("org.example.gradle.check.dependencies")
     id("org.example.gradle.check.format-gradle")
     id("org.example.gradle.check.format-java")
+    id("org.example.gradle.check.format-kotlin")
     id("org.example.gradle.feature.checksum")
     id("org.example.gradle.feature.compile-java")
+    id("org.example.gradle.feature.compile-kotlin")
     id("org.example.gradle.feature.javadoc")
     id("org.example.gradle.feature.test")
     id("org.example.gradle.feature.test-end-to-end")
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.component.library.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.component.library.gradle.kts
index 265f96df..66c89f8d 100644
--- a/gradle/plugins/src/main/kotlin/org.example.gradle.component.library.gradle.kts
+++ b/gradle/plugins/src/main/kotlin/org.example.gradle.component.library.gradle.kts
@@ -6,7 +6,9 @@ plugins {
     id("org.example.gradle.check.dependencies")
     id("org.example.gradle.check.format-gradle")
     id("org.example.gradle.check.format-java")
+    id("org.example.gradle.check.format-kotlin")
     id("org.example.gradle.feature.compile-java")
+    id("org.example.gradle.feature.compile-kotlin")
     id("org.example.gradle.feature.javadoc")
     id("org.example.gradle.feature.test")
 }
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.feature.compile-kotlin.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.feature.compile-kotlin.gradle.kts
new file mode 100644
index 00000000..1c5e9d3f
--- /dev/null
+++ b/gradle/plugins/src/main/kotlin/org.example.gradle.feature.compile-kotlin.gradle.kts
@@ -0,0 +1,19 @@
+import org.gradle.jvm.toolchain.JavaLanguageVersion
+
+plugins {
+    id("org.jetbrains.kotlin.jvm")
+    id("org.example.gradle.base.lifecycle")
+}
+
+kotlin {
+    jvmToolchain {
+        languageVersion =
+            JavaLanguageVersion.of(
+                providers
+                    .fileContents(isolated.rootProject.projectDirectory.file("gradle/jdk-version.txt"))
+                    .asText
+                    .get()
+                    .trim()
+            )
+    }
+}
diff --git a/kamino/build.gradle.kts b/kamino/build.gradle.kts
index dbc6bab8..7bf82aae 100644
--- a/kamino/build.gradle.kts
+++ b/kamino/build.gradle.kts
@@ -5,6 +5,7 @@ plugins {
 
 dependencies {
     api(projects.coruscant)
+    api(libs.kotlin.stdlib)
     api(libs.resteasy.core)
     implementation(libs.resteasy.guice)
     implementation(libs.resteasy.jackson2.provider)
diff --git a/kashyyyk/build.gradle.kts b/kashyyyk/build.gradle.kts
index 63630d2f..995b9753 100644
--- a/kashyyyk/build.gradle.kts
+++ b/kashyyyk/build.gradle.kts
@@ -3,6 +3,7 @@ plugins { id("org.example.gradle.component.library") }
 dependencies {
     api(projects.naboo)
     api(projects.tatooine)
+    api(libs.kotlin.stdlib)
     implementation(projects.bespin)
     implementation(projects.kamino)
 
diff --git a/naboo/build.gradle.kts b/naboo/build.gradle.kts
index bc93807e..4c391dd4 100644
--- a/naboo/build.gradle.kts
+++ b/naboo/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins { id("org.example.gradle.component.library") }
 
 dependencies {
+    api(libs.kotlin.stdlib)
     implementation(libs.solr.solrj)
     implementation(libs.zookeeper.jute)
 
diff --git a/tatooine/build.gradle.kts b/tatooine/build.gradle.kts
index 0a382204..75391a0c 100644
--- a/tatooine/build.gradle.kts
+++ b/tatooine/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins { id("org.example.gradle.component.library") }
 
 dependencies {
+    api(libs.kotlin.stdlib)
     api(libs.typesafeconfig.guice)
     implementation(libs.zookeeper)