Fix image input/output Groovy syntax

by introducing a container extension.

Authored-by: Leonhardt Koepsell <hello@lnhrdt.com>

Author: lnhrdt

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Chore
 
 - Improve image input/output API.
+- Groovy syntax accesses image input/output features on container extension. 
 
 ## [0.2.1] - 2025-04-23
 

src/main/kotlin/dev/codebandits/container/gradle/image/extensions.kt

@@ -6,6 +6,24 @@ import org.gradle.api.provider.Provider
 import java.net.URLEncoder
 import java.nio.charset.StandardCharsets
 
+public abstract class ContainerTaskExtension(private val task: Task) {
+  public fun inputLocalImage(imageReference: String) {
+    task.inputLocalImage(imageReference)
+  }
+
+  public fun outputLocalImage(imageReference: String) {
+    task.outputLocalImage(imageReference)
+  }
+
+  public fun inputRegistryImage(imageReference: String, autoRefresh: Boolean = false) {
+    task.inputRegistryImage(imageReference, autoRefresh)
+  }
+
+  public fun outputRegistryImage(imageReference: String, autoRefresh: Boolean = false) {
+    task.outputRegistryImage(imageReference, autoRefresh)
+  }
+}
+
 public fun Task.inputLocalImage(
   imageReference: String,
 ) {

src/main/kotlin/dev/codebandits/container/gradle/plugin/ContainerPlugin.kt

@@ -1,8 +1,13 @@
 package dev.codebandits.container.gradle.plugin
 
+import dev.codebandits.container.gradle.image.ContainerTaskExtension
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 
 public class ContainerPlugin : Plugin<Project> {
-  override fun apply(target: Project) {}
+  override fun apply(target: Project) {
+    target.tasks.all { task ->
+      task.extensions.create("container", ContainerTaskExtension::class.java, task)
+    }
+  }
 }

src/testFeatures/kotlin/dev/codebandits/container/gradle/GroovySyntaxTest.kt

@@ -26,14 +26,13 @@ class GroovySyntaxTest : GradleProjectTest() {
     buildGradleFile.appendLine(
       """
       import dev.codebandits.container.gradle.tasks.ContainerTask
-      import dev.codebandits.container.gradle.image.outputLocalImage
       
       plugins {
         id("dev.codebandits.container")
       }
       
       tasks.register("buildImage", ContainerTask) {
-        outputLocalImage("$imageReference")
+        container.      outputLocalImage("$imageReference")
         dockerPull { it.image.set("docker:dind") }
         dockerRun {
           it.image.set("docker:dind")