帮会旗语：双旗组合的战场信号

local SIGNALS = {
    ["1_1"] = "集合", ["1_2"] = "攻左",
    ["2_2"] = "攻右", ["2_3"] = "防守",
    ["3_3"] = "撤退", ["1_3"] = "集火",
    ["4_4"] = "包抄", ["2_4"] = "待命",
}
local function flagSignal(actor, f1, f2)
    if f1 > f2 then f1, f2 = f2, f1 end
    local msg = SIGNALS[f1 .. "_" .. f2]
    if msg == nil then
        sendmsg(actor, 1, "无效旗语组合")
        return
    end
    sendcentermsg(0, "旗语指令：" .. msg)
end

local function signalLog(actor, guild)
    local n = getsysvar("flagN_" .. guild) or 0
    for i = math.max(n - 2, 1), n do
        sendmsg(actor,
            getsysvar("flagH_" .. i .. "_" .. guild))
    end
end