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% Update the ConTeXt filename cache if the system ls-R files are modified
\startluacode
    local addsuffix = file.addsuffix
    local attributes = lfs.attributes
    local difftime = os.difftime
    local file_join = file.join
    local getfirstreadablefile = caches.getfirstreadablefile
    local gethashes = resolvers.gethashes
    local hashed = caches.hashed
    local ipairs = ipairs
    local pcall = pcall
    local resolve = resolvers.resolve
    local time = os.time
    local totime = utilities.parsers.totime

    local stale = false
    for _, tree in ipairs(gethashes()) do
        local lsR_path = file_join(resolve(tree.name), "ls-R")
        local lsR_time = attributes(lsR_path, "modification")

        local hash = hashed(tree.name)
        local path = getfirstreadablefile(addsuffix(hash, "lua"), "trees")

        local state, blob = pcall(loadfile, path)
        local hash_time

        if blob then
            local data = blob()
            if data then
                hash_time = time(totime(data.date .. " " .. data.time))
            end
        end

        if lsR_time and hash_time and difftime(lsR_time, hash_time) > 0 then
            stale = true
        end
    end

    if stale then
        resolvers.renewcache()
        resolvers.load()
    end
\stopluacode

% Set the default paper size
\readsysfile{context-papersize.tex}{}{}