Laura Kassovic <******@****.***> 1711088091 -0700

        def runGreetWith = { String greeting ->
            inDirectory('root')
            switch (systemPropertySource) {
                case SystemPropertySource.COMMAND_LINE:
                    return configurationCacheRun('greet', "-Dgreeting=$greeting")
                case SystemPropertySource.GRADLE_PROPERTIES:
                    file('root/gradle.properties').text = "systemProp.greeting=$greeting"

        buildFile << """
            task greeting(type: CustomTask) {
                greeting = 'yo configuration cache'
            }
        """
        def configurationCache = newConfigurationCacheFixture()

        when:
        configurationCacheRun("greeting")

        then:
        result.assertTaskExecuted(":buildSrc:jar")
        result.assertTaskExecuted(":greeting")

        when:

        def producer = file('producer')
        def consumer = file('consumer')
        def pluginModule = mavenRepo.module('com.example', 'producer', '1.0')
        def pluginMarker = mavenRepo.module('com.example.greeting', 'com.example.greeting.gradle.plugin', '1.0')

        producer.file('settings.gradle') << ''
        producer.file('build.gradle') << """
            plugins {
                id('java-gradle-plugin')

        def producer = file('producer')
        def consumer = file('consumer')
        def pluginModule = mavenRepo.module('com.example', 'producer', '1.0')
        def pluginMarker = mavenRepo.module('com.example.greeting', 'com.example.greeting.gradle.plugin', '1.0')

        producer.file('settings.gradle').createFile()
        producer.file('build.gradle') << """
            plugins {
                id('java-gradle-plugin')

            doLast {
                println("Hello from plugin 'com.tutorial.greeting'")
            }
        }
    }
}
----
=====

As we can see, the `license` plugin, when applied, exposes a `greeting` task with a simple print statement.

== Step 5. View Plugin Tasks

When the `license` plugin is applied to the `app` project, the `greeting` task becomes available:

        then:
        subprojectDir.file("src/main/cpp").assertHasDescendants(SAMPLE_LIB_CLASS)
        subprojectDir.file("src/main/public").assertHasDescendants("greeting.h")
        subprojectDir.file("src/test/cpp").assertHasDescendants(SAMPLE_LIB_TEST_CLASS)

        and:
        subprojectDir.file("src/main/public/greeting.h").text.contains("namespace greeting {")

interface GreetingPluginExtension {
    Property<String> getMessage()
}

class GreetingPlugin implements Plugin<Project> {
    void apply(Project project) {
        // Add the 'greeting' extension object
        def extension = project.extensions.create('greeting', GreetingPluginExtension)
        // Add a task that uses configuration from the extension object
        project.task('hello') {
            doLast {

interface GreetingPluginExtension {
    val message: Property<String>
}

class GreetingPlugin : Plugin<Project> {
    override fun apply(project: Project) {
        // Add the 'greeting' extension object
        val extension = project.extensions.create<GreetingPluginExtension>("greeting")
        extension.message.convention("Hello from GreetingPlugin")
        // Add a task that uses configuration from the extension object
        project.task("hello") {

interface GreetingPluginExtension {
    val message: Property<String>
}

class GreetingPlugin : Plugin<Project> {
    override fun apply(project: Project) {
        // Add the 'greeting' extension object
        val extension = project.extensions.create<GreetingPluginExtension>("greeting")
        // Add a task that uses configuration from the extension object
        project.task("hello") {
            doLast {
                println(extension.message.get())