esx_core/server/main.lua

AddEventHandler('es:invalidCommandHandler', function(source, command_args, user)
	CancelEvent()
	TriggerClientEvent('chat:addMessage', source, {args = {'^1SYSTEM', _U('unknown_command', command_args[1])}})
end)

AddEventHandler('chatMessage', function(playerId, playerName, message)
	if string.sub(message, 1, string.len('/')) ~= '/' then
		CancelEvent()

		local xPlayer = ESX.GetPlayerFromId(playerId)
		if xPlayer then playerName = xPlayer.getName() end
		TriggerClientEvent('chat:addMessage', -1, {args = {_U('ooc_prefix', playerName), message}, color = {128, 128, 128}})
	end
end)

RegisterCommand('twt', function(playerId, args, rawCommand)
	if playerId == 0 then
		print('esx_rpchat: you can\'t use this command from console!')
	else
		args = table.concat(args, ' ')
		local playerName = GetRealPlayerName(playerId)

		TriggerClientEvent('chat:addMessage', -1, {args = {_U('twt_prefix', playerName), args}, color = {0, 153, 204}})
	end
end, false)

RegisterCommand('me', function(playerId, args, rawCommand)
	if source == 0 then
		print('esx_rpchat: you can\'t use this command from console!')
	else
		args = table.concat(args, ' ')
		local playerName = GetRealPlayerName(playerId)

		TriggerClientEvent('esx_rpchat:sendProximityMessage', -1, source, _U('me_prefix', playerName), args, {255, 0, 0})
	end
end, false)

RegisterCommand('do', function(playerId, args, rawCommand)
	if source == 0 then
		print('esx_rpchat: you can\'t use this command from console!')
	else
		args = table.concat(args, ' ')
		local playerName = GetRealPlayerName(playerId)

		TriggerClientEvent('esx_rpchat:sendProximityMessage', -1, source, _U('do_prefix', playerName), args, {0, 0, 255})
	end
end, false)

function GetRealPlayerName(playerId)
	local xPlayer = ESX.GetPlayerFromId(playerId)

	if xPlayer then
		if Config.EnableESXIdentity then
			if Config.OnlyFirstname then
				return xPlayer.get('firstName')
			else
				return xPlayer.getName()
			end
		else
			return xPlayer.getName()
		end
	else
		return GetPlayerName(playerId)
	end
end