source: binary-improvements/CoppisAdditions/src/Commands/PlayerChatMaxLength.cs@ 288

using System;
using System.Collections.Generic;
using AllocsFixes.PersistentData;
using System.Threading;
using UnityEngine;

namespace CoppisAdditions.CustomCommands
{
        public class PlayerChatMaxLength : ConsoleCmdAbstract
        {
                public override string GetDescription ()
                {
                        return "set the maximum number of characters a player can write in a single message";
                }

                public override string GetHelp ()
                {
                        return "Set the maximum number of characters a player can write in a single message." +
                        "Usage:\n" +
                        "   pcml <steam id/player name/entity id> <chat length>\n";
                }

                public override string[] GetCommands ()
                {
                        return new string[] { "playerchatmaxlength", "pcml" };
                }

                public override void Execute (List<string> _params, CommandSenderInfo _senderInfo)
                {
                        try {
                                if (_params.Count != 2) {
                                        SdtdConsole.Instance.Output ("Wrong number of arguments, expected 2, found " + _params.Count + ".");
                                        SdtdConsole.Instance.Output (" ");
                                        SdtdConsole.Instance.Output (GetHelp ());
                                        return;
                                }

                                string steamid = PersistentContainer.Instance.Players.GetSteamID (_params [0], true);
                                if (steamid == null) {
                                        SdtdConsole.Instance.Output ("Playername or entity/steamid id not found.");
                                        return;
                                }

                                int maxLen = int.MinValue;
                                int.TryParse (_params [1], out maxLen);

                                if (maxLen == int.MinValue || maxLen < 1) {
                                        SdtdConsole.Instance.Output ("the parameter \"chat length\" must be an integer equal or greater than 1");
                                        return;
                                }


                                Player p = PersistentContainer.Instance.Players [steamid, false];
                                if (p != null) {
                                        p.MaxChatLength  = maxLen;
                                        SdtdConsole.Instance.Output (p.Name + ": max chat length changed to " + maxLen);
                                }

                        } catch (Exception e) {
                                Log.Out ("Error in PlayerChatMaxLength: " + e);
                        }
                }
        }
}