@TaskAction
    fun summarize() {
        outputFile.get().asFile.run {
            parentFile.mkdirs()
            writeText(summaryString())
        }
    }

    private
    fun summaryString() = inputSummaries.files.joinToString(separator = "\\n") { it.readText() }
}

tasks.register<CombineSummaries>("summarize") {
    inputSummaries.from(summarizedFiles)