Gradle First Level Dependency Subgraph Size

build.gradle

task firstLevelSubgraphSize << {
    def cardinality = { ResolvedDependency d, Set<ModuleVersionIdentifier> alreadySeen ->
       alreadySeen.add(d.module.id) ? d.children.sum(0) { owner.call(it, alreadySeen) } + 1 : 0
    }
    configurations.compile.resolvedConfiguration.firstLevelModuleDependencies.each {
        println it.module.id.toString() + ' -> ' + cardinality(it, [] as Set)
    }
}