feat: implement PlayerChat hook and dispatch logic

CommandHook/CommandHookModSystem.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using Vintagestory.API.Common;
+using Vintagestory.API.Datastructures;
 using Vintagestory.API.Server;
 
 namespace CommandHook;
@@ -13,6 +14,7 @@ public class CommandHookModSystem : ModSystem
     public override void StartServerSide(ICoreServerAPI api)
     {
         Mod.Logger.Notification("[CommandHook] Loaded");
+        api.Event.PlayerChat += OnPlayerChat;
     }
 
     public void Register(string modId, CommandRegistration registration)
@@ -24,4 +26,31 @@ public class CommandHookModSystem : ModSystem
         }
         list.Add(registration);
     }
+
+    private void OnPlayerChat(
+        IServerPlayer player,
+        int channelId,
+        ref string message,
+        ref string data,
+        BoolRef consumed
+    )
+    {
+        if (!message.StartsWith('/'))
+            return;
+
+        var cmdData = new CommandData(player, message);
+
+        foreach (var (_, list) in registrations)
+        foreach (var reg in list)
+            if (reg.CommandFilter == "*" || reg.CommandFilter == cmdData.CommandName)
+                reg.Before?.Invoke(ref cmdData);
+
+        if (cmdData.Cancel)
+            consumed.value = true;
+
+        foreach (var (_, list) in registrations)
+        foreach (var reg in list)
+            if (reg.CommandFilter == "*" || reg.CommandFilter == cmdData.CommandName)
+                reg.After?.Invoke(ref cmdData);
+    }
 }