createJar(classGraph, classesDir, manifestFile, jarFile)

        return jarFile
    }

    private
    fun createJar(classGraph: ClassGraph, classesDir: File, manifestFile: File, jarFile: File) {
        try {
            JarOutputStream(BufferedOutputStream(FileOutputStream(jarFile))).use { jarOutputStream ->
                if (manifestFile.exists()) {

import java.io.IOException
import java.util.Properties
import java.util.jar.JarEntry
import java.util.jar.JarFile


data class PluginEntry(val pluginId: String, val implementationClass: String)


fun pluginEntriesFrom(jar: File): List<PluginEntry> = try {
    JarFile(jar, false).use { jarFile ->
        jarFile.entries().asSequence().filter {
            isGradlePluginPropertiesFile(it)
        }.map { pluginEntry ->

    private val unshadedPackages: Set<String>,
    private val ignorePackages: Set<String>
) {

    fun analyze(jarFile: File, classesDir: File, manifestFile: File, buildReceipt: File): ClassGraph {
        val classGraph = classGraph()

        val jarUri = URI.create("jar:${jarFile.toPath().toUri()}")
        FileSystems.newFileSystem(jarUri, emptyMap<String, Any>()).use { jarFileSystem ->

        }
    }

    private
    fun openJarFile(file: File) =
        openJars.computeIfAbsent(file, ::JarFile)

    override fun close() {
        openJars.values.forEach(JarFile::close)
    }
}


/**
 * See https://docs.oracle.com/javase/8/docs/technotes/tools/findingclasses.html#userclass
 */
private
val File.isClassPathArchive