Dynamically change caller of Groovy closure #groovy

changeCallerOfClosure.groovy

void withOptionalDocker(String dockerImageName, Closure body) {
    (dockerImageName
        ? { c -> withDockerContainer(image: dockerImageName) {c()} }
        : { c -> c() }
    )(body)
}

withOptionalDocker(shouldUseDocke() ? 'my-image' : null) { 
    sh 'doSomething' 
}