source: binary-improvements/AllocsCommands/Commands/Reply.cs@ 267

using System;
using System.Collections.Generic;

namespace AllocsFixes.CustomCommands
{
        public class Reply : ConsoleCmdAbstract
        {
                public override string GetDescription ()
                {
                        return "send a message to  the player who last sent you a PM";
                }

                public override string GetHelp () {
                        return "Usage:\n" +
                                   "   reply <message>\n" +
                                   "Send the given message to the user you last received a PM from.";
                }

                public override string[] GetCommands ()
                {
                        return new string[] { "reply", "re" };
                }

                private void RunInternal (ClientInfo _sender, List<string> _params)
                {
                        if (_params.Count < 1) {
                                SdtdConsole.Instance.Output ("Usage: reply <message>");
                                return;
                        }

                        string message = _params [0];

                        ClientInfo receiver = PrivateMessageConnections.GetLastPMSenderForPlayer (_sender);
                        if (receiver != null) {
                                Chat.SendMessage (receiver, _sender, message);
                        } else {
                                if (receiver != null) {
                                        SdtdConsole.Instance.Output ("The sender of the PM you last received is currently not online.");
                                } else {
                                        SdtdConsole.Instance.Output ("You have not received a PM so far.");
                                }
                        }
                }

                public override void Execute (List<string> _params, CommandSenderInfo _senderInfo) {
                        if (_senderInfo.RemoteClientInfo == null) {
                                Log.Out ("Command \"reply\" can only be used on clients!");
                        } else {
                                RunInternal (_senderInfo.RemoteClientInfo, _params);
                        }
                }
        }
}