Terra/buildSrc/src/main/kotlin/AddonConfig.kt

import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
import java.io.File
import java.util.function.Predicate
import org.gradle.api.Project
import org.gradle.api.Task
import org.gradle.kotlin.dsl.extra
import kotlin.streams.asStream


/**
 * Configures a directory where addons will be put.
 */
fun Project.addonDir(dir: File, task: Task) {
    val moveAddons = tasks.register("moveAddons" + task.name) {
        dependsOn("compileAddons")
        doLast {
            dir.parentFile.mkdirs()
            matchingAddons(dir) {
                it.name.startsWith("Terra-") // Assume everything that starts with Terra- is a core addon.
            }.forEach {
                logger.info("Deleting old addon: " + it.absolutePath)
                it.delete()
            }
            forSubProjects(":common:addons") {
                val jar = tasks.named("shadowJar").get() as ShadowJar
                
                val boot = if (extra.has("bootstrap") && extra.get("bootstrap") as Boolean) "bootstrap/" else ""
                val target = File(dir, boot + jar.archiveFileName.get())
                
                val base = "${jar.archiveBaseName.get()}-${version}"
                
                logger.info("Copying addon ${jar.archiveFileName.get()} to ${target.absolutePath}. Base name: $base")
                
                jar.archiveFile.orNull?.asFile?.copyTo(target)
            }
        }
        
    }
    
    task.dependsOn(moveAddons)
}

fun matchingAddons(dir: File, matcher: Predicate<File>): Set<File> {
    val matching = HashSet<File>()
    dir.walk().asStream().filter(matcher).forEach(matching::add)
    return matching
}