【入门夯实】值日表轮换：值班排班的轮转写法

local DUTY = "老张"
local function whoOnDuty()
    return DUTY
end

local ROSTER = { "老张", "小李", "王五", "赵六", "钱七" }
local ANCHOR = os.time({ year = 2026, month = 9, day = 1 })
local function whoOnDuty()
    local days = math.floor((os.time() - ANCHOR) / 86400)
    local idx = days % #ROSTER + 1
    return ROSTER[idx]
end
local function whoBackup()
    local days = math.floor((os.time() - ANCHOR) / 86400)
    local idx = (days + 1) % #ROSTER + 1
    return ROSTER[idx]
end

sendmsg(nil, 1, "今日值班：" .. whoOnDuty() .. "，明日：" .. whoBackup())

local SKIP = { ["钱七"] = true }
local function whoOnDutySkip()
    local days = math.floor((os.time() - ANCHOR) / 86400)
    for i = 0, #ROSTER do
        local name = ROSTER[(days + i) % #ROSTER + 1]
        if not SKIP[name] then
            return name
        end
    end
    return ROSTER[1]
end