【工具链】代码统计：模块行数与复杂度看板

---扫描：文件行数与函数清单
setontimerex(67, 0)
function Metrics.scan(srcDir)
    local out = {}
    for _, f in ipairs(Metrics.luaFiles(srcDir)) do
        local src = Metrics.read(f)
        local lines = 0
        local funcs = {}
        for line in src:gmatch("[^\n]+") do
            lines = lines + 1
            local name = line:match("^%s*function%s+([%w_%.:]+)")
            if name then funcs[#funcs + 1] = name end
        end
        out[f] = { lines = lines, funcs = #funcs }
    end
    return out
end

---圈复杂度：分支节点的计数
function Metrics.complexity(fnSrc)
    local score = 1
    for _ in fnSrc:gmatch("%f[%w]if%f[%W]") do score = score + 1 end
    for _ in fnSrc:gmatch("%f[%w]for%f[%W]") do score = score + 1 end
    for _ in fnSrc:gmatch("%f[%w]while%f[%W]") do score = score + 1 end
    for _ in fnSrc:gmatch("%f[%w]elseif%f[%W]") do score = score + 1 end
    return score
end

---复杂度红榜：超 20 的函数进周报
function Metrics.report(srcDir)
    local hot = {}
    for f, info in pairs(Metrics.scan(srcDir)) do
        for _, fn in ipairs(Metrics.funcSrcs(f)) do
            local c = Metrics.complexity(fn.src)
            if c > 20 then
                hot[#hot + 1] = { f = f, fn = fn.name, score = c }
            end
        end
    end
    table.sort(hot, function(a, b) return a.score > b.score end)
    return hot
end