帮会树：成长树节点的逐层点亮

local function lightNode(actor, guild, nodeId)
    local parent = math.floor(nodeId / 2)
    if nodeId > 1 and
        getsysvar("tree_" .. parent .. "_" .. guild) ~= 1 then
        sendmsg(actor, 1, "父节点尚未点亮")
        return
    end
    local cost = 200 * nodeId
    local fund = getsysvar("gFund_" .. guild) or 0
    if fund < cost then
        sendmsg(actor, 1, "帮会基金不足 " .. cost)
        return
    end
    setsysvarex("gFund_" .. guild, fund - cost)
    setsysvarex("tree_" .. nodeId .. "_" .. guild, 1)
    sendcentermsg(0, guild .. " 帮会树第 "
        .. nodeId .. " 节点点亮")
end

local function treePerk(actor, guild, nodeId)
    if getsysvar("tree_" .. nodeId .. "_" .. guild) == 1 then
        sendmsg(actor, 1, "节点 " .. nodeId
            .. " 福利已生效")
    else
        sendmsg(actor, 1, "节点 " .. nodeId .. " 未点亮")
    end
end