Add command register for ChatBot

ChatBot can register their own command for interacting with user

MinecraftClient/ChatBot.cs

@@ -1089,5 +1089,54 @@ namespace MinecraftClient
         {
             return Handler.UpdateSign(location, line1, line2, line3, line4);
         }
+
+        /// <summary>
+        /// Register a command in command prompt
+        /// </summary>
+        /// <param name="CMDName">Name of the command</param>
+        /// <param name="CMDDesc">Description/usage of the command</param>
+        /// <param name="Run">Method for handling the command</param>
+        /// <returns>True if successfully registered</returns>
+        protected bool RegisterChatBotCommand(string CMDName, string CMDDesc, CommandRunner Run)
+        {
+            return Handler.RegisterCommand(CMDName, CMDDesc, Run);
+        }
+    }
+
+    /// <summary>
+    /// Command runner definition.
+    /// Returned string will be the output of the command
+    /// </summary>
+    /// <param name="command">Full command</param>
+    /// <param name="args">Arguments in the command</param>
+    /// <returns></returns>
+    public delegate string CommandRunner(string command, string[] args);
+
+    /// <summary>
+    /// Command class with constructor for creating command for ChatBots.
+    /// </summary>
+    public class ChatBotCommand : Command
+    {
+        public CommandRunner Runner;
+
+        public override string CMDName { get; }
+        public override string CMDDesc { get; }
+        public override string Run(McClient handler, string command, Dictionary<string, object> localVars)
+        {
+            return this.Runner(command, getArgs(command));
+        }
+
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        /// <param name="CMDName">Name of the command</param>
+        /// <param name="CMDDesc">Description/usage of the command</param>
+        /// <param name="runner">Method for handling the command</param>
+        public ChatBotCommand(string CMDName, string CMDDesc, CommandRunner runner)
+        {
+            this.CMDName = CMDName;
+            this.CMDDesc = CMDDesc;
+            this.Runner = runner;
+        }
     }
 }

MinecraftClient/McClient.cs

@@ -25,6 +25,7 @@ namespace MinecraftClient
         private static readonly List<string> cmd_names = new List<string>();
         private static readonly Dictionary<string, Command> cmds = new Dictionary<string, Command>();
         private readonly Dictionary<Guid, string> onlinePlayers = new Dictionary<Guid, string>();
+        private static bool CommandLoaded = false;
 
         private readonly List<ChatBot> bots = new List<ChatBot>();
         private static readonly List<ChatBot> botsOnHold = new List<ChatBot>();
@@ -338,7 +339,7 @@ namespace MinecraftClient
         {
             /* Load commands from the 'Commands' namespace */
 
-            if (cmds.Count == 0)
+            if (!CommandLoaded)
             {
                 Type[] cmds_classes = Program.GetTypesInNamespace("MinecraftClient.Commands");
                 foreach (Type type in cmds_classes)
@@ -359,6 +360,7 @@ namespace MinecraftClient
                         }
                     }
                 }
+                CommandLoaded = true;
             }
 
             /* Process the provided command */
@@ -572,6 +574,30 @@ namespace MinecraftClient
             }
         }
 
+        /// <summary>
+        /// Register a command prompt command
+        /// </summary>
+        /// <param name="CMDName">Name of the command</param>
+        /// <param name="CMDDesc">Description/usage of the command</param>
+        /// <param name="runner">Method for handling the command</param>
+        /// <returns>True if successfully registered</returns>
+        public bool RegisterCommand(string CMDName, string CMDDesc, CommandRunner runner)
+        {
+            if (cmds.ContainsKey(CMDName.ToLower()))
+            {
+                return false;
+            }
+            else
+            {
+                Command cmd = new ChatBotCommand(CMDName, CMDDesc, runner);
+                cmds.Add(CMDName.ToLower(), cmd);
+                cmd_names.Add(CMDName.ToLower());
+                return true;
+            }
+        }
+
+        
+
         #region Management: Load/Unload ChatBots and Enable/Disable settings
 
         /// <summary>