Add setting for Kotlin package to codegen (#194)

pkl-gradle/src/main/java/org/pkl/gradle/PklPlugin.java

@@ -196,12 +196,15 @@ public class PklPlugin implements Plugin<Project> {
           configureCodeGenSpec(spec);
 
           spec.getGenerateKdoc().convention(false);
+          spec.getKotlinPackage().convention("");
 
           createModulesTask(KotlinCodeGenTask.class, spec)
               .configure(
                   task -> {
                     configureCodeGenTask(task, spec);
                     task.getGenerateKdoc().set(spec.getGenerateKdoc());
+                    task.getIndent().set(spec.getIndent());
+                    task.getKotlinPackage().set(spec.getKotlinPackage());
                   });
         });
 

pkl-gradle/src/main/java/org/pkl/gradle/spec/KotlinCodeGenSpec.java

@@ -19,5 +19,9 @@ import org.gradle.api.provider.Property;
 
 /** Configuration options for Kotlin code generators. Documented in user manual. */
 public interface KotlinCodeGenSpec extends CodeGenSpec {
+  Property<String> getIndent();
+
+  Property<String> getKotlinPackage();
+
   Property<Boolean> getGenerateKdoc();
 }

pkl-gradle/src/main/java/org/pkl/gradle/task/KotlinCodeGenTask.java

@@ -25,6 +25,9 @@ public abstract class KotlinCodeGenTask extends CodeGenTask {
   @Input
   public abstract Property<Boolean> getGenerateKdoc();
 
+  @Input
+  public abstract Property<String> getKotlinPackage();
+
   @Override
   protected void doRunTask() {
     //noinspection ResultOfMethodCallIgnored
@@ -35,6 +38,7 @@ public abstract class KotlinCodeGenTask extends CodeGenTask {
                 getCliBaseOptions(),
                 getProject().file(getOutputDir()).toPath(),
                 getIndent().get(),
+                getKotlinPackage().get(),
                 getGenerateKdoc().get(),
                 getGenerateSpringBootConfig().get(),
                 getImplementSerializable().get()))

pkl-gradle/src/test/kotlin/org/pkl/gradle/KotlinCodeGeneratorsTest.kt

@@ -65,7 +65,22 @@ class KotlinCodeGeneratorsTest : AbstractTest() {
     assertThat(personClassFile).exists()
     assertThat(addressClassFile).exists()
   }
-  
+
+  @Test
+  fun `compile generated code with custom kotlin package`() {
+    writeBuildFile(kotlinPackage = "my.cool.pkl.pkg")
+    writePklFile()
+    runTask("compileKotlin")
+
+    val classesDir = testProjectDir.resolve("build/classes/kotlin/main")
+    val moduleClassFile = classesDir.resolve("my/cool/pkl/pkg/org/Mod.class")
+    val personClassFile = classesDir.resolve("my/cool/pkl/pkg/org/Mod\$Person.class")
+    val addressClassFile = classesDir.resolve("my/cool/pkl/pkg/org/Mod\$Address.class")
+    assertThat(moduleClassFile).exists()
+    assertThat(personClassFile).exists()
+    assertThat(addressClassFile).exists()
+  }
+
   @Test
   fun `no source modules`() {
     writeFile(
@@ -88,7 +103,7 @@ class KotlinCodeGeneratorsTest : AbstractTest() {
     assertThat(result.output).contains("No source modules specified.")
   }
 
-  private fun writeBuildFile() {
+  private fun writeBuildFile(kotlinPackage: String? = null) {
     val kotlinVersion = "1.6.0"
 
     writeFile(
@@ -125,6 +140,7 @@ class KotlinCodeGeneratorsTest : AbstractTest() {
             sourceModules = ["mod.pkl"]
             outputDir = file("build/generated")
             settingsModule = "pkl:settings"
+            ${kotlinPackage?.let { "kotlinPackage = \"$it\"" } ?: ""}
           }
         }
       }