source: TFP-WebServer/CommandExtensions/src/Commands/Reply.cs@ 499

using System.Collections.Generic;
using JetBrains.Annotations;

namespace CommandExtensions.Commands {
        [UsedImplicitly]
        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[] {"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) {
                                ChatHelpers.SendMessage (receiver, _sender, message);
                        } else {
                                SdtdConsole.Instance.Output (
                                        "You have not received a PM so far or sender of last received PM is no longer online.");
                        }
                }

                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);
                        }
                }
        }
}