Start working on multi world support

build.gradle.kts

@@ -21,6 +21,7 @@ repositories {
 dependencies {
     implementation(kotlin("stdlib-jdk8"))
     implementation(kotlin("reflect"))
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.7")
     implementation("commons-codec:commons-codec:1.14")
     compileOnly("com.comphenix.protocol", "ProtocolLib", "4.5.0")
     compileOnly("org.spigotmc", "spigot-api", "1.15.2-R0.1-SNAPSHOT")

src/main/kotlin/de/moritzruth/spigot_ttt/CommandManager.kt

@@ -5,6 +5,7 @@ import de.moritzruth.spigot_ttt.game.InfoCommand
 import de.moritzruth.spigot_ttt.game.ReviveCommand
 import de.moritzruth.spigot_ttt.game.StartCommand
 import de.moritzruth.spigot_ttt.game.items.AddItemSpawnCommand
+import de.moritzruth.spigot_ttt.worlds.WorldCommand
 
 object CommandManager {
     fun initializeCommands() {
@@ -15,5 +16,6 @@ object CommandManager {
         ResourcepackCommand()
         ReloadTTTConfigCommand()
         InfoCommand()
+        WorldCommand()
     }
 }

src/main/kotlin/de/moritzruth/spigot_ttt/TTTPlugin.kt

@@ -1,6 +1,7 @@
 package de.moritzruth.spigot_ttt
 
 import de.moritzruth.spigot_ttt.game.GameManager
+import de.moritzruth.spigot_ttt.worlds.WorldManager
 import org.bukkit.ChatColor
 import org.bukkit.plugin.java.JavaPlugin
 
@@ -12,6 +13,8 @@ class TTTPlugin: JavaPlugin() {
     override fun onEnable() {
         saveDefaultConfig()
 
+        WorldManager.removeNeglectedWorlds()
+
         CommandManager.initializeCommands()
         GameManager.initialize()
 

src/main/kotlin/de/moritzruth/spigot_ttt/utils/ConfigurationFile.kt

@@ -2,18 +2,18 @@ package de.moritzruth.spigot_ttt.utils
 
 import de.moritzruth.spigot_ttt.plugin
 import org.bukkit.configuration.file.YamlConfiguration
-import java.nio.file.Paths
+import java.io.File
 
-class ConfigurationFile(name: String): YamlConfiguration() {
+class ConfigurationFile(private val file: File): YamlConfiguration() {
-    private val filePath = Paths.get(plugin.dataFolder.absolutePath, "$name.yml").toAbsolutePath().toString()
+    constructor(name: String) : this(plugin.dataFolder.resolve("$name.yml"))
 
     init {
         try {
-            load(filePath)
+            load(file)
         } catch (e: Exception) {}
     }
 
     fun save() {
-        save(filePath)
+        save(file)
     }
 }

src/main/kotlin/de/moritzruth/spigot_ttt/utils/CreateTabCompleter.kt

@@ -4,12 +4,15 @@ import org.bukkit.command.CommandSender
 import org.bukkit.command.TabCompleter
 
 fun createTabCompleter(fn: (sender: CommandSender, index: Int) -> List<String>?) =
+    createTabCompleter { sender, index, _ -> fn(sender, index) }
+
+fun createTabCompleter(fn: (sender: CommandSender, index: Int, args: List<String>) -> List<String>?) =
     TabCompleter { sender, _, _, args ->
         val index = args.count()
 
         val completions =
             if (index == 0) emptyList()
-            else fn(sender, index) ?: emptyList()
+            else fn(sender, index, args.toList()) ?: emptyList()
 
         completions.filter { it.startsWith(args.last(), true) }
     }

src/main/kotlin/de/moritzruth/spigot_ttt/worlds/TTTWorld.kt

@@ -0,0 +1,73 @@
+package de.moritzruth.spigot_ttt.worlds
+
+import de.moritzruth.spigot_ttt.plugin
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import org.bukkit.WorldCreator
+
+class TTTWorld(val sourceWorld: WorldManager.SourceWorld) {
+    var state: State = State.NOT_COPIED; private set
+    enum class State {
+        NOT_COPIED,
+        COPYING,
+        COPIED,
+        LOADED,
+        UNLOADING
+    }
+
+    val id = WorldManager.tttWorlds.count()
+    val actualWorldName = "${WORLD_PREFIX}${id}"
+    private val worldDir = plugin.server.worldContainer.resolve("./$actualWorldName")
+
+    init {
+        WorldManager.tttWorlds.add(this)
+    }
+
+    suspend fun copy() {
+        if (state != State.NOT_COPIED) throw IllegalStateException("The world was already copied")
+        state = State.COPYING
+
+        coroutineScope {
+            launch(Dispatchers.IO) {
+                sourceWorld.dir.copyRecursively(worldDir)
+            }
+        }
+    }
+
+    fun load() {
+        if (state != State.COPIED) throw IllegalStateException("The world was not copied yet or already loaded")
+        plugin.server.createWorld(WorldCreator.name(actualWorldName))
+    }
+
+    suspend fun save() {
+        if (state != State.LOADED) throw IllegalStateException("The world must be loaded")
+
+        coroutineScope {
+            launch(Dispatchers.IO) {
+                val tempWorldDir = WorldManager.worldsDir.resolve("./${sourceWorld.name}_$id")
+                worldDir.copyRecursively(tempWorldDir)
+                sourceWorld.dir.deleteRecursively()
+                tempWorldDir.renameTo(sourceWorld.dir)
+                state = State.NOT_COPIED
+            }
+        }
+    }
+
+    suspend fun unloadAndRemove() {
+        if  (state != State.LOADED) throw IllegalStateException("The world must be loaded")
+        state = State.UNLOADING
+        plugin.server.unloadWorld(actualWorldName, false)
+
+        coroutineScope {
+            launch(Dispatchers.IO) {
+                worldDir.deleteRecursively()
+                state = State.NOT_COPIED
+            }
+        }
+    }
+
+    companion object {
+        const val WORLD_PREFIX = "tempworld_"
+    }
+}

src/main/kotlin/de/moritzruth/spigot_ttt/worlds/WorldCommand.kt

@@ -0,0 +1,29 @@
+package de.moritzruth.spigot_ttt.worlds
+
+import de.moritzruth.spigot_ttt.plugin
+import de.moritzruth.spigot_ttt.utils.createTabCompleter
+import org.bukkit.command.Command
+import org.bukkit.command.CommandExecutor
+import org.bukkit.command.CommandSender
+
+class WorldCommand: CommandExecutor {
+    init {
+        val command = plugin.getCommand("world")!!
+        command.setExecutor(this)
+        command.tabCompleter = createTabCompleter { _, index, args ->
+            return@createTabCompleter when(index) {
+                0 -> listOf("load", "save", "join", "list")
+                1 -> when(args[0].toLowerCase()) {
+                    "load" -> WorldManager.sourceWorlds.map { it.name }
+                    "save", "join" -> WorldManager.tttWorlds.map { it.id.toString() }
+                    else -> null
+                }
+                else -> null
+            }
+        }
+    }
+
+    override fun onCommand(sender: CommandSender, command: Command, label: String, args: Array<out String>): Boolean {
+        TODO("Not yet implemented")
+    }
+}

src/main/kotlin/de/moritzruth/spigot_ttt/worlds/WorldManager.kt

@@ -0,0 +1,24 @@
+package de.moritzruth.spigot_ttt.worlds
+
+import de.moritzruth.spigot_ttt.plugin
+import de.moritzruth.spigot_ttt.utils.ConfigurationFile
+import java.io.File
+
+object WorldManager {
+    data class SourceWorld(val dir: File) {
+        val name: String = dir.name
+        val config = ConfigurationFile(dir.resolve("config.yml"))
+    }
+
+    val worldsDir = plugin.dataFolder.resolve("./worlds").also { it.mkdirs() }
+    val sourceWorlds = worldsDir.listFiles(File::isDirectory)!!.map { SourceWorld(it) }
+
+    val tttWorlds = mutableSetOf<TTTWorld>()
+
+    fun removeNeglectedWorlds() {
+        plugin.server.worldContainer.listFiles { file ->
+            file.isDirectory && file.name.startsWith(TTTWorld.WORLD_PREFIX) &&
+                    tttWorlds.find { it.actualWorldName == file.name } != null
+        }!!.forEach { it.deleteRecursively() }
+    }
+}

src/main/resources/plugin.yml

@@ -23,12 +23,12 @@ commands:
     description: Add an item spawn
 
   revive:
-    usage: /revive [player] ['here']
+    usage: /revive [Player] ['here']
     permission: ttt.revive
     description: Revive yourself or another player at the world spawn or at your location
 
   info:
-    usage: /info [player]
+    usage: /info [Player]
     permission: ttt.info
     description: Show information about all players or a specific player
 
@@ -45,3 +45,8 @@ commands:
     permission: ttt.reload
     aliases:
       - rt
+
+  world:
+    usage: /world load <Name> OR /world <'join'|'save'> <World ID> OR /world list
+    description: Perform world operations
+    permission: ttt.world