I'm trying to write a gradle plugin, I put it in /...

# gradle

[ursus]

I'm trying to write a gradle plugin, I put it in /buildSrc, I define the META-INF/gradle-plugins/foo.bar.properties with fully qualified name, I apply it at the target project with apply plugin: foo.bar . Everyting works


Then I change the plugin source from groovy to kotlin, and it doesn't work

class BrowserStackPlugin :Plugin<Project> {
    override fun apply(project: Project) {
       ...
    }
}

A problem occurred evaluating project ':app'.
> No implementation class specified for plugin 'foo.bar' in jar:file:/C:/Users/ursus/.gradle/caches/jars-8/d86af8da5bcd5c16642c4dc40605c5b9/buildSrc.jar!/META-INF/gradle-plugins/foo.bar.properties.

Are kotlin plugins not supported in buildSrc??

[ephemient]

they are supported, but buildSrc/build.gradle(.kts) needs to apply a kotlin (or embedded-kotlin or kotlin-dsl) plugin

[ursus]

Hmm but I don't want the dsl so far, I only use kotlin to write the plugin with autocomplete; but I'm not familiar with the embedded one

Trying putting this in build.gradle

plugins {
    id "kotlin"
}

is probably not supposed to work right

[ursus]

Btw would you say a separate module for the plugin is better, if its only going to be consumed within the project, never shared outside? I see the composite build way of doing this, of which im not sure why would I need that, can't I just include a local module for the build classpath?

[ephemient]

the usual org.jetbrains.kotlin.jvm plugin, or the org.gradle.embedded-kotlin one (which will be sure to match the version that's embedded in Gradle)

[ephemient]

buildSrc ends up in the root buildscript classpath, while if you use a separate build, it will only be loaded in the projects that need it

[ursus]

Hm, so then my snippet should make it work, no?

[mbonnin]

Try to add a syntax error to your Kotlin code to make sure it's compiled.

[mbonnin]

If not, you need to add this in buildSrc/build.gradle[.kts] :

plugins {
    id("org.jetbrains.kotlin.jvm").version("1.5.30")
}

[mbonnin]

Also, if your plugin is in buildSrc already, you can apply it by class too:

apply<BrowserStackPlugin>()

[edrd]

Also, if you are using Gradle >= 6, you can use precompiled script plugins so you don't need to write META-INF files and stuff

[ephemient]

you don't have to write META-INF with java-gradle-plugin either, it will write it for you

gradlePlugin {
    plugins {
       fooBar {
            id = "foo.bar"
            implementationClass = "..."
        }
    }
}