Work on commands. Implemented helper functions, among others to handle asynchronous commands

src/main/kotlin/io/dico/parcels2/command/ParcelCommands.kt

@@ -0,0 +1,51 @@
+package io.dico.parcels2.command
+
+import io.dico.dicore.command.CommandException
+import io.dico.dicore.command.ExecutionContext
+import io.dico.dicore.command.annotation.Cmd
+import io.dico.dicore.command.annotation.Desc
+import io.dico.parcels2.ParcelOwner
+import io.dico.parcels2.ParcelsPlugin
+import io.dico.parcels2.util.parcelLimit
+import io.dico.parcels2.util.uuid
+import org.bukkit.entity.Player
+
+class ParcelCommands(override val plugin: ParcelsPlugin) : HasWorlds, HasPlugin {
+    override val worlds = plugin.worlds
+
+    private fun error(message: String): Nothing {
+        throw CommandException(message)
+    }
+
+    @Cmd("auto")
+    @Desc("Finds the unclaimed parcel nearest to origin,",
+        "and gives it to you",
+        shortVersion = "sets you up with a fresh, unclaimed parcel")
+    fun cmdAuto(player: Player, context: ExecutionContext) = requireInWorld(player) {
+        delegateCommandAsync(context) {
+            val numOwnedParcels = plugin.storage.getNumParcels(ParcelOwner(uuid = player.uuid)).await()
+
+            awaitSynchronousTask {
+                val limit = player.parcelLimit
+
+                if (numOwnedParcels >= limit) {
+                    error("You have enough plots for now")
+                }
+
+                val parcel = world.nextEmptyParcel()
+                    ?: error("This world is full, please ask an admin to upsize it")
+                parcel.owner = ParcelOwner(uuid = player.uuid)
+                player.teleport(world.generator.getHomeLocation(parcel))
+                "Enjoy your new parcel!"
+            }
+        }
+    }
+
+    @Cmd("info", aliases = ["i"])
+    @Desc("Displays general information",
+        "about the parcel you're on",
+        shortVersion = "displays information about this parcel")
+    fun cmdInfo(player: Player) = requireInParcel(player) { parcel.infoString }
+
+
+}