Garry's Mod SAM advert command.

announce.lua

if SAM_LOADED then return end

local sam, command, language = sam, sam.command, sam.language

command.set_category("Advert")

sam.command.new("tsay")
    :SetPermission("tsay", "trialstaff")
    :Help("This will put a message in chat everyone will be able to see.")
    :GetRestArgs(true)
    :AddArg("text")
    :OnExecute(function(calling_ply, targets)
    	net.Start("Announce")
        net.WriteString(targets)
        net.Broadcast()
    end)
    :End()
    
if SERVER then 
    util.AddNetworkString("Announce")
else
    net.Receive("Announce", function()
        chat.AddText(Color(255, 0, 0), "[All]: ", Color(255, 255, 255), net.ReadString())
    end)
end