Add /status command

src/main/java/emu/lunarcore/LunarCore.java

@@ -226,7 +226,7 @@ public class LunarCore {
         return "";
     }
 
-    private static String getGitHash() {
+    public static String getGitHash() {
         // Use a string builder in case one of the build config fields are missing
         StringBuilder builder = new StringBuilder();
         
@@ -246,7 +246,7 @@ public class LunarCore {
         }
         
         if (builder.isEmpty()) {
-            return "";
+            return "UNKNOWN";
         } else {
             return builder.toString();
         }
@@ -274,6 +274,14 @@ public class LunarCore {
             timeOffset = 0;
         }
     }
+    
+    /**
+     * Returns the memory usage of the server, in megabytes.
+     */
+    public static long getMemoryUsage() {
+        Runtime runtime = Runtime.getRuntime();
+        return (runtime.totalMemory() - runtime.freeMemory()) / 1_048_576L;
+    }
 
     // Server console
 

src/main/java/emu/lunarcore/command/commands/StatusCommand.java

@@ -0,0 +1,28 @@
+package emu.lunarcore.command.commands;
+
+import emu.lunarcore.LunarCore;
+import emu.lunarcore.command.Command;
+import emu.lunarcore.command.CommandArgs;
+import emu.lunarcore.command.CommandHandler;
+
+@Command(label = "status", aliases = {"st", "stats"}, permission = "admin.status", desc = "/status. Displays the status of the server.")
+public class StatusCommand implements CommandHandler {
+
+    @Override
+    public void execute(CommandArgs args) {
+        // Run garbage collector
+        if (!args.hasFlag("-nogc")) {
+            System.gc();
+        }
+        
+        // Show status
+        args.sendMessage("Showing server status");
+        
+        args.sendMessage("Git hash: " + LunarCore.getGitHash());
+        args.sendMessage("Memory usage: " + LunarCore.getMemoryUsage() + " MB");
+        
+        if (LunarCore.getGameServer() != null) {
+            args.sendMessage("Player count: " + LunarCore.getGameServer().getPlayerCount());
+        }
+    }
+}

src/main/java/emu/lunarcore/server/game/GameServer.java

@@ -70,6 +70,12 @@ public class GameServer extends KcpServer {
     public GameServerConfig getServerConfig() {
         return this.serverConfig;
     }
+    
+    public int getPlayerCount() {
+        synchronized (this.players) {
+            return this.players.size();
+        }
+    }
 
     public void registerPlayer(Player player) {
         synchronized (this.players) {