Initial working slash commands on 0.16. TODO: new API

src/pocketmine/Player.php

@@ -102,6 +102,7 @@ use pocketmine\nbt\tag\ShortTag;
 use pocketmine\nbt\tag\StringTag;
 use pocketmine\network\protocol\AdventureSettingsPacket;
 use pocketmine\network\protocol\AnimatePacket;
+use pocketmine\network\protocol\AvailableCommandsPacket;
 use pocketmine\network\protocol\BatchPacket;
 use pocketmine\network\protocol\ChunkRadiusUpdatedPacket;
 use pocketmine\network\protocol\ContainerClosePacket;
@@ -1686,7 +1687,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 		$pk->eduMode = 0;
 		$pk->rainLevel = 0; //TODO: implement these properly
 		$pk->lightningLevel = 0;
-		$pk->commandsEnabled = 0;
+		$pk->commandsEnabled = 1;
 		$pk->unknown = "UNKNOWN";
 		$pk->worldName = $this->server->getMotd();
 		$this->dataPacket($pk);
@@ -1712,6 +1713,14 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 		if($this->isOp()){
 			$this->setRemoveFormat(false);
 		}
+		
+		$pk = new AvailableCommandsPacket();
+		$data = [];
+		foreach($this->server->getCommandMap()->getCommands() as $command){
+			$data[$command->getName()] = $command->generateJsonData($this);
+		}
+		$pk->commands = json_encode($data);
+		$this->dataPacket($pk);
 
 		if($this->isCreative()){
 			$this->inventory->sendCreativeContents();
@@ -2483,6 +2492,21 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 
 				$this->setDataFlag(self::DATA_FLAGS, self::DATA_FLAG_ACTION, false);
 				break;
+			case ProtocolInfo::COMMAND_STEP_PACKET:
+				if($this->spawned === false or !$this->isAlive()){
+					break;
+				}
+				$this->craftingType = 0;
+				Timings::$playerCommandTimer->startTiming();
+				$commandText = $packet->command;
+				if($packet->args !== null){
+					foreach($packet->args as $arg){ //command ordering will be an issue
+						$commandText .= " " . $arg;
+					}
+				}
+				$this->server->dispatchCommand($this, $commandText);
+				Timings::$playerCommandTimer->stopTiming();
+				break;
 			case ProtocolInfo::TEXT_PACKET:
 				if($this->spawned === false or !$this->isAlive()){
 					break;

src/pocketmine/command/Command.php

@@ -27,6 +27,7 @@ namespace pocketmine\command;
 use pocketmine\event\TextContainer;
 use pocketmine\event\TimingsHandler;
 use pocketmine\event\TranslationContainer;
+use pocketmine\Player;
 use pocketmine\Server;
 use pocketmine\utils\TextFormat;
 
@@ -85,6 +86,25 @@ abstract class Command{
 		$this->timings = new TimingsHandler("** Command: " . $name);
 	}
 
+	public function generateJsonData(Player $player) : array{
+		/*if(!$this->testPermissionSilent($player)){
+			return [];
+		}*/
+		$data = [
+			"versions" => [
+				[
+					"description" => $this->getDescription(),
+					"overloads" => $this->getOverloadData(),
+					"permission" => "any", //TODO: implement vanilla op API
+				]
+			]
+		];
+		if(count($aliases = $this->getAliases()) > 0){
+			$data["versions"][0]["aliases"] = $aliases;
+		}
+		return $data;
+	}
+
 	/**
 	 * @param CommandSender $sender
 	 * @param string        $commandLabel
@@ -101,6 +121,34 @@ abstract class Command{
 		return $this->name;
 	}
 
+	/**
+	 * Returns an array of overload data for generating JSON data for AvailableCommandsPacket
+	 * To show custom usages and command parameters, you MUST override this method and define
+	 * your own parameters and overloads. Omitting this method will cause the generic default
+	 * [args: string] message to be shown.
+	 *
+	 * @return array
+	 */
+	public function getOverloadData() : array{
+		$data = [
+			"default" => [
+				"input" => [
+					"parameters" => [
+						0 => [ //Default rawtext parameter for old plugins
+							"name" => "args",
+							"type" => "rawtext",
+							"optional" => true
+						]
+					]
+				],
+				"output" => [
+					"format_strings" => []
+				]
+			]
+		];
+		return $data;
+	}
+
 	/**
 	 * @return string
 	 */

src/pocketmine/network/protocol/CommandStepPacket.php

@@ -38,8 +38,27 @@ class CommandStepPacket extends DataPacket{
 	 * https://gist.github.com/dktapps/8285b93af4ca38e0104bfeb9a6c87afd
 	 */
 
+	public $command;
+	public $overload;
+	public $uvarint1;
+	public $uvarint2;
+	public $bool;
+	public $uvarint64;
+	public $args; //JSON formatted command arguments
+	public $string4;
+
 	public function decode(){
-		//TODO
+		$this->command = $this->getString();
+		$this->overload = $this->getString();
+		$this->uvarint1 = $this->getUnsignedVarInt();
+		$this->uvarint2 = $this->getUnsignedVarInt();
+		$this->bool = (bool) $this->getByte();
+		$this->uvarint64 = $this->getUnsignedVarInt(); //TODO: varint64
+		$this->args = json_decode($this->getString());
+		$this->string4 = $this->getString();
+		while(!$this->feof()){
+			$this->getByte(); //prevent assertion errors. TODO: find out why there are always 3 extra bytes at the end of this packet.
+		}
 	}
 
 	public function encode(){