}

class GreetingPlugin : Plugin<Project> {
    override fun apply(project: Project) {
        val extension = project.extensions.create<GreetingPluginExtension>("greeting")
        project.task("hello") {
            doLast {
                println("${extension.message.get()} from ${extension.greeter.get()}")
            }
        }
    }
}

apply<GreetingPlugin>()

                    implementationClass = 'example.plugin.GreetingPlugin'
                }
            }
            publishing {
                repositories {
                    maven { url = '${mavenRepo.uri}' }
                }
            }
        """
        producer.file('src/main/java/example/plugin/GreetingPlugin.java') << pluginImplementation()

        consumer.file('settings.gradle') << """

// setting convention when registering a task from plugin
class GreetingPlugin implements Plugin<Project> {
    void apply(Project project) {
        project.getTasks().register("hello", GreetingTask) {
            greeter.convention("Greeter")
        }
    }
}
// end::convention-callsites-from-plugin[]

apply plugin: GreetingPlugin

// tag::convention-callsites-from-buildscript[]

include::sample[dir="snippets/plugins/greetingPlugin/groovy",files="buildSrc/src/main/groovy/GreetingPlugin.gradle[]"]
====

The `GreetingPlugin` can now be applied in other subprojects' builds by using its ID:

====
include::sample[dir="snippets/plugins/greetingPlugin/kotlin",files="app/build.gradle.kts[tag=use-plugin]"]
include::sample[dir="snippets/plugins/greetingPlugin/groovy",files="app/build.gradle[tag=use-plugin]"]
====

----

    id 'idea'
}

group = 'org.sample'
version = '1.0-SNAPSHOT'

gradlePlugin {
    plugins {
        customPlugin {
            id = 'org.sample.greeting'
            implementationClass = 'org.sample.GreetingPlugin'
        }
    }

Hello from the GreetingPlugin...

rootProject.name = "greetingPlugin"

Hello from the convention GreetingPlugin...

// tag::use-plugin[]
plugins {
    id 'application'
    id('GreetingPlugin')
}

// tag::use-plugin[]
plugins {
    application
    id("GreetingPlugin")
}