configure ktlint with custom rules

build-plugins/build.gradle.kts

@@ -23,6 +23,8 @@ repositories {
 dependencies {
     implementation(gradleApi())
     implementation(kotlin("gradle-plugin", "1.8.22"))
+    // make our custom lint rules available to the buildscript classpath
+    runtimeOnly(project(":ktlint-rules"))
 }
 
 group = "aws.sdk.kotlin"

build-plugins/src/main/kotlin/aws/sdk/kotlin/gradle/dsl/CodeStyle.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package aws.sdk.kotlin.gradle.dsl
+
+import aws.sdk.kotlin.gradle.util.verifyRootProject
+import org.gradle.api.Project
+import org.gradle.api.attributes.Bundling
+import org.gradle.api.tasks.JavaExec
+import org.gradle.kotlin.dsl.dependencies
+import org.gradle.kotlin.dsl.named
+import org.gradle.kotlin.dsl.register
+
+/**
+ * Configure lint rules for the project
+ * @param lintPaths list of paths relative to the project root to lint (or not lint).
+ */
+fun Project.configureLinting(lintPaths: List<String>) {
+    verifyRootProject { "Kotlin SDK lint configuration is expected to be configured on the root project" }
+
+    val ktlint = configurations.create("ktlint") {
+        attributes {
+            attribute(Bundling.BUNDLING_ATTRIBUTE, objects.named(Bundling.EXTERNAL))
+        }
+    }
+
+    // TODO - is there anyway to align this with the version from libs.versions.toml in this project/repo
+    val ktlintVersion = "0.48.1"
+    dependencies {
+        ktlint("com.pinterest:ktlint:$ktlintVersion")
+    }
+
+    // add the buildscript classpath which should pickup our custom ktlint-rules (via runtimeOnly dep on this plugin)
+    // plus any custom rules added by consumer
+    val execKtlintClaspath = ktlint + buildscript.configurations.getByName("classpath")
+    tasks.register<JavaExec>("ktlint") {
+        description = "Check Kotlin code style."
+        group = "Verification"
+        classpath = execKtlintClaspath
+        mainClass.set("com.pinterest.ktlint.Main")
+        args = lintPaths
+        jvmArgs("--add-opens", "java.base/java.lang=ALL-UNNAMED")
+    }
+
+    tasks.register<JavaExec>("ktlintFormat") {
+        description = "Auto fix Kotlin code style violations"
+        group = "formatting"
+        classpath = execKtlintClaspath
+        mainClass.set("com.pinterest.ktlint.Main")
+        args = listOf("-F") + lintPaths
+        jvmArgs("--add-opens", "java.base/java.lang=ALL-UNNAMED")
+    }
+}

build-plugins/src/main/kotlin/aws/sdk/kotlin/gradle/kmp/KmpDefaultsPlugin.kt

@@ -4,6 +4,7 @@
  */
 package aws.sdk.kotlin.gradle.kmp
 
+import aws.sdk.kotlin.gradle.util.verifyRootProject
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 
@@ -15,7 +16,10 @@ import org.gradle.api.Project
  */
 class KmpDefaultsPlugin : Plugin<Project> {
     override fun apply(target: Project) {
-        target.logger.info("applying kmp defaults plugin to $target")
-        target.configureKmpTargets()
+        with(target) {
+            logger.info("applying kmp defaults plugin to $target")
+            verifyRootProject { "AWS SDK KmpDefaultsPlugin requires installation into root project" }
+            configureKmpTargets()
+        }
     }
 }

build-plugins/src/main/kotlin/aws/sdk/kotlin/gradle/kmp/KmpProjectExt.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package aws.sdk.kotlin.gradle.kmp
+
+import org.gradle.api.Project
+import org.gradle.kotlin.dsl.configure
+import org.gradle.kotlin.dsl.the
+import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
+
+/**
+ * Allows configuration from parent projects subprojects/allprojects block when they haven't configured the KMP
+ * plugin but the subproject has applied it. The extension is otherwise not visible.
+ */
+fun Project.kotlin(block: KotlinMultiplatformExtension.() -> Unit) {
+    configure(block)
+}
+val Project.kotlin: KotlinMultiplatformExtension get() = the()

build-plugins/src/main/kotlin/aws/sdk/kotlin/gradle/kmp/ProjectExt.kt → build-plugins/src/main/kotlin/aws/sdk/kotlin/gradle/util/ProjectExt.kt

@@ -2,26 +2,15 @@
  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0
  */
-package aws.sdk.kotlin.gradle.kmp
+package aws.sdk.kotlin.gradle.util
 
+import org.gradle.api.GradleException
 import org.gradle.api.Project
 import org.gradle.api.plugins.ExtraPropertiesExtension
-import org.gradle.kotlin.dsl.configure
 import org.gradle.kotlin.dsl.extra
-import org.gradle.kotlin.dsl.the
-import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
 import java.io.File
 import java.util.*
 
-/**
- * Allows configuration from parent projects subprojects/allprojects block when they haven't configured the KMP
- * plugin but the subproject has applied it. The extension is otherwise not visible.
- */
-fun Project.kotlin(block: KotlinMultiplatformExtension.() -> Unit) {
-    configure(block)
-}
-val Project.kotlin: KotlinMultiplatformExtension get() = the()
-
 public fun <T> ExtraPropertiesExtension.getOrNull(name: String): T? {
     if (!has(name)) return null
     @Suppress("UNCHECKED_CAST")
@@ -68,3 +57,12 @@ inline fun <reified T> Project.typedProp(name: String): T? {
         else -> error("unknown type ${T::class} for property $name")
     }
 }
+
+public inline fun Project.verifyRootProject(lazyMessage: () -> Any) {
+    if (rootProject != this) {
+        val message = lazyMessage()
+        throw AwsSdkGradleException(message.toString())
+    }
+}
+
+class AwsSdkGradleException(message: String) : GradleException(message)

build.gradle.kts

@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 allprojects {
+    group = "aws.sdk.kotlin"
+
     repositories {
         mavenCentral()
     }

ktlint-rules/build.gradle.kts

@@ -1,3 +1,9 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 /*
  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0
@@ -11,16 +17,27 @@ plugins {
 
 kotlin {
     sourceSets {
-        val main by getting {
+        main {
             dependencies {
                 implementation(libs.ktlint.core)
             }
         }
 
-        val test by getting {
+        test {
             dependencies {
                 implementation(libs.ktlint.test)
             }
         }
     }
 }
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+
+tasks.withType<JavaCompile> {
+    sourceCompatibility = JavaVersion.VERSION_1_8.toString()
+    targetCompatibility = JavaVersion.VERSION_1_8.toString()
+}