custom_aliases/init.lua

aliases = {}

function alias(short, orig, param)
    aliases[short] = {
        orig = orig,
        param = param or ""
    }
end

alias("gim", "giveme")
alias("grm", "grantme")
-- needs to be in minetest game?
-- alias("h", "home")
alias("sd", "shutdown")
alias("t", "teleport")
alias("t0", "teleport", "0 0 0")

minetest.register_on_sending_chat_message(function(message)
	if message:sub(1,1) ~= "/" then
		return
	end

	local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
	if not cmd then
        minetest.display_chat_message("-!- Empty command")
		return true
	end
    param = param or ""

	if (not minetest.registered_chatcommands[cmd]) and (aliases[cmd]) then
        if aliases[cmd].param ~= "" then
            param = aliases[cmd].param
        end
        -- minetest.display_chat_message("Param = " .. param)
        minetest.display_chat_message("alias for: /" .. aliases[cmd].orig .. " " .. param)
        minetest.run_server_chatcommand(aliases[cmd].orig, param)
        return true
	end
end)