【进阶实战】变更回放：历史变更的时间线查询封装

local changeLog = {}
local function logChange(target, author, summary)
    local entry = {
        ts = os.time(), target = target,
        author = author, summary = summary,
    }
    changeLog[#changeLog + 1] = entry
    print("变更登记：" .. target .. " by " .. author)
end
local function replay(fromTs, toTs, targetFilter)
    local out = {}
    for _, e in ipairs(changeLog) do
        if e.ts >= fromTs and e.ts <= toTs
            and (targetFilter == nil or e.target == targetFilter) then
            out[#out + 1] = e
        end
    end
    return out
end

logChange("drop_rate", "策划小李", "祖玛教主 1/5000 调至 1/4500")
logChange("rank_script", "程序老王", "排序键加入等级维度")
local suspect = replay(os.time() - 3 * 86400, os.time(), "drop_rate")
for _, e in ipairs(suspect) do
    print(os.date("%m-%d %H:%M", e.ts) .. " " .. e.author .. " " .. e.summary)
end