Use spotless to format remaining Kotlin files

Also: fix issue where some commented out Kotlin files are invalid.

build.gradle.kts

@@ -40,7 +40,7 @@ idea {
   }
 }
 
-val clean by tasks.registering(Delete::class) {
+val clean by tasks.existing {
   delete(layout.buildDirectory)
 }
 

buildSrc/build.gradle.kts

@@ -1,5 +1,18 @@
-import org.jetbrains.kotlin.config.JvmTarget
-
+/**
+ * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ *
+ * 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
+ *
+ *     https://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.
+ */
 plugins {
   `kotlin-dsl`
 }
@@ -7,9 +20,7 @@ plugins {
 dependencies {
   implementation(libs.downloadTaskPlugin)
   implementation(libs.spotlessPlugin)
-  implementation(libs.kotlinPlugin) {
-    exclude(module = "kotlin-android-extensions")
-  }
+  implementation(libs.kotlinPlugin) { exclude(module = "kotlin-android-extensions") }
   implementation(libs.shadowPlugin)
 
   // fix from the Gradle team: makes version catalog symbols available in build scripts
@@ -22,12 +33,4 @@ java {
   targetCompatibility = JavaVersion.VERSION_17
 }
 
-kotlin {
-  target {
-    compilations.configureEach {
-      kotlinOptions {
-        jvmTarget = "17"
-      }
-    }
-  }
-}
+kotlin { target { compilations.configureEach { kotlinOptions { jvmTarget = "17" } } } }

buildSrc/src/main/kotlin/pklAllProjects.gradle.kts

@@ -1,10 +1,27 @@
+/**
+ * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ *
+ * 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
+ *
+ *     https://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.
+ */
+import com.diffplug.gradle.spotless.KotlinGradleExtension
+import org.gradle.accessors.dm.LibrariesForLibs
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
+plugins { id("com.diffplug.spotless") }
+
 val buildInfo = extensions.create<BuildInfo>("buildInfo", project)
 
-dependencyLocking {
-  lockAllConfigurations()
-}
+dependencyLocking { lockAllConfigurations() }
 
 configurations {
   val rejectedVersionSuffix = Regex("-alpha|-beta|-eap|-m|-rc|-snapshot", RegexOption.IGNORE_CASE)
@@ -13,8 +30,10 @@ configurations {
       componentSelection {
         all {
           if (rejectedVersionSuffix.containsMatchIn(candidate.version)) {
-            reject("Rejected dependency $candidate " +
-                "because it has a prelease version suffix matching `$rejectedVersionSuffix`.")
+            reject(
+              "Rejected dependency $candidate " +
+                "because it has a prelease version suffix matching `$rejectedVersionSuffix`."
+            )
           }
         }
       }
@@ -36,24 +55,13 @@ tasks.withType<KotlinCompile>().configureEach {
 }
 
 plugins.withType(IdeaPlugin::class).configureEach {
-  val errorMessage = "Use IntelliJ Gradle import instead of running the `idea` task. See README for more information."
+  val errorMessage =
+    "Use IntelliJ Gradle import instead of running the `idea` task. See README for more information."
 
-  tasks.named("idea") {
-    doFirst {
-      throw GradleException(errorMessage)
-    }
-  }
-  tasks.named("ideaModule") {
-    doFirst {
-      throw GradleException(errorMessage)
-    }
-  }
+  tasks.named("idea") { doFirst { throw GradleException(errorMessage) } }
+  tasks.named("ideaModule") { doFirst { throw GradleException(errorMessage) } }
   if (project == rootProject) {
-    tasks.named("ideaProject") {
-      doFirst {
-        throw GradleException(errorMessage)
-      }
-    }
+    tasks.named("ideaProject") { doFirst { throw GradleException(errorMessage) } }
   }
 }
 
@@ -72,11 +80,7 @@ plugins.withType(MavenPublishPlugin::class).configureEach {
     // dependency versions in generated POMs
     publications {
       withType(MavenPublication::class.java) {
-        versionMapping {
-          allVariants {
-            fromResolutionResult()
-          }
-        }
+        versionMapping { allVariants { fromResolutionResult() } }
       }
     }
   }
@@ -84,12 +88,9 @@ plugins.withType(MavenPublishPlugin::class).configureEach {
 
 // settings.gradle.kts sets `--write-locks`
 // if Gradle command line contains this task name
-val updateDependencyLocks by tasks.registering {
-  doLast {
-    configurations
-      .filter { it.isCanBeResolved }
-      .forEach { it.resolve() }
-  }
+val updateDependencyLocks by
+  tasks.registering {
+    doLast { configurations.filter { it.isCanBeResolved }.forEach { it.resolve() } }
   }
 
 val allDependencies by tasks.registering(DependencyReportTask::class)
@@ -118,3 +119,36 @@ tasks.withType(JavaExec::class).configureEach {
     server = true
   }
 }
+
+// Version Catalog library symbols.
+private val libs = the<LibrariesForLibs>()
+
+private val licenseHeaderFile by lazy {
+  rootProject.file("buildSrc/src/main/resources/license-header.star-block.txt")
+}
+
+private fun KotlinGradleExtension.configureFormatter() {
+  ktfmt(libs.versions.ktfmt.get()).googleStyle()
+  targetExclude("**/generated/**", "**/build/**")
+  licenseHeaderFile(licenseHeaderFile, "([a-zA-Z]|@file|//)")
+}
+
+spotless {
+  // When building root project, format buildSrc files too.
+  // We need this because buildSrc is not a subproject of the root project, so a top-level
+  // `spotlessApply` will not trigger `buildSrc:spotlessApply`.
+  if (project === rootProject) {
+    kotlinGradle {
+      configureFormatter()
+      target("*.kts", "buildSrc/**/*.kts")
+    }
+    kotlin {
+      ktfmt(libs.versions.ktfmt.get()).googleStyle()
+      targetExclude("**/generated/**", "**/build/**")
+      target("buildSrc/**/*.kt")
+      licenseHeaderFile(licenseHeaderFile)
+    }
+  } else {
+    kotlinGradle { configureFormatter() }
+  }
+}

buildSrc/src/main/kotlin/pklJavaLibrary.gradle.kts

@@ -1,3 +1,18 @@
+/**
+ * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ *
+ * 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
+ *
+ *     https://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.
+ */
 @file:Suppress("HttpUrlsUsage")
 
 import org.gradle.accessors.dm.LibrariesForLibs
@@ -30,11 +45,14 @@ spotless {
     targetExclude("**/generated/**", "**/build/**")
     licenseHeaderFile(rootProject.file("buildSrc/src/main/resources/license-header.star-block.txt"))
   }
+  kotlin {
+    ktfmt(libs.versions.ktfmt.get()).googleStyle()
+    targetExclude("**/generated/**", "**/build/**")
+    licenseHeaderFile(rootProject.file("buildSrc/src/main/resources/license-header.star-block.txt"))
+  }
 }
 
-tasks.compileKotlin {
-  enabled = false
-}
+tasks.compileKotlin { enabled = false }
 
 tasks.jar {
   manifest {
@@ -49,10 +67,13 @@ tasks.javadoc {
   (options as StandardJavadocDocletOptions).addStringOption("Xdoclint:none", "-quiet")
 }
 
-val workAroundKotlinGradlePluginBug by tasks.registering {
+val workAroundKotlinGradlePluginBug by
+  tasks.registering {
     doLast {
-    // Works around this problem, which sporadically appears and disappears in different subprojects:
-    // A problem was found with the configuration of task ':pkl-executor:compileJava' (type 'JavaCompile').
+      // Works around this problem, which sporadically appears and disappears in different
+      // subprojects:
+      // A problem was found with the configuration of task ':pkl-executor:compileJava' (type
+      // 'JavaCompile').
       // > Directory '[...]/pkl/pkl-executor/build/classes/kotlin/main'
       // specified for property 'compileKotlinOutputClasses' does not exist.
       layout.buildDirectory.dir("classes/kotlin/main").get().asFile.mkdirs()

buildSrc/src/main/kotlin/pklKotlinLibrary.gradle.kts

@@ -23,11 +23,3 @@ dependencies {
 tasks.compileKotlin {
   enabled = true // disabled by pklJavaLibrary
 }
-
-spotless {
-  kotlin {
-    ktfmt(libs.versions.ktfmt.get()).googleStyle()
-    targetExclude("**/generated/**", "**/build/**")
-    licenseHeaderFile(rootProject.file("buildSrc/src/main/resources/license-header.star-block.txt"))
-  }
-}

pkl-core/src/test/kotlin/org/pkl/core/runtime/DefaultModuleResolverTest.kt

@@ -1,4 +1,4 @@
-//package org.pkl.core.runtime;
+package org.pkl.core.runtime;
 //
 //import java.io.IOException;
 //import java.net.URI;

pkl-core/src/test/kotlin/org/pkl/core/runtime/ModuleKeyTest.kt

@@ -1,4 +1,4 @@
-//package org.pkl.core.runtime;
+package org.pkl.core.runtime;
 //
 //import java.io.File;
 //import java.io.IOException;