if not modules then modules = { } end modules ['luat-cnf'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkxl",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local type = type
local format, concat = string.format, table.concat

local report = logs.reporter("system")

luatex       = luatex or { }
local luatex = luatex

texconfig.functionsize   = 32768
texconfig.propertiessize = 10000

-- These lists need updating! If we decide to keep them at all.

local stub = [[

-- checking

storage = storage or { }
luatex  = luatex  or { }

-- as soon as possible

texconfig.functionsize   = 32768
texconfig.propertiessize = 10000

luatex.starttime = os.gettimeofday()

-- this will happen after the format is loaded

function texconfig.init()

    -- development

    local builtin, globals = { }, { }

    libraries = { -- we set it here as we want libraries also 'indexed'
        basiclua = {
            "string", "table", "coroutine", "debug", "file", "io", "lpeg", "math", "os", "package",
            "utf8",
        },
        basictex = {
            "callback", "font", "lua", "node", "status", "tex", "texconfig", "texio", "token",
            "font", "language",
        },
        extralua = {
            "library", "luac",
            "xzip", "xmath", "xcomplex", "xdecimal", "basexx", "posit", "sparse",
            "md5", "sha2", "aes", "fio", "sio",
            "lfs","socket",
        },
        extratex = {
            "pdfe", "mplib", "potrace",
            "pdfdecode", "pngdecode",
        },
        optional = {
            "cerf", "curl", "foreign", "ghostscript", "graphicsmagick", "hb", "imagemagick",
            "kpse", "lzma", "lzo", "lz4", "mujs", "mysql", "optional", "postgress", "sqlite",
            "zint", "zstd",
        },
        obsolete = {
        },
        functions = {
            "assert", "pcall", "xpcall", "error", "collectgarbage",
            "dofile", "load","loadfile", "require", "module",
            "getmetatable", "setmetatable",
            "ipairs", "pairs", "rawequal", "rawget", "rawset", "next",
            "tonumber", "tostring",
            "type", "unpack", "select", "print",
        },
        builtin = builtin, -- to be filled
        globals = globals, -- to be filled
    }

    for k, v in next, _G do
        globals[k] = tostring(v)
    end

    local function collect(t,fnc)
        local lib = { }
        for k, v in next, t do
            if fnc then
                lib[v] = _G[v]
            else
                local keys = { }
                local gv = _G[v]
                local tv = type(gv)
                if tv == "table" then
                    for k, v in next, gv do
                        keys[k] = tostring(v) -- true -- by tostring we cannot call overloads functions (security)
                    end
                end
                lib[v] = keys
                builtin[v] = keys
            end
        end
        return lib
    end

    libraries.basiclua  = collect(libraries.basiclua)
    libraries.basictex  = collect(libraries.basictex)
    libraries.extralua  = collect(libraries.extralua)
    libraries.extratex  = collect(libraries.extratex)
    libraries.functions = collect(libraries.functions,true)
    libraries.obsolete  = collect(libraries.obsolete)
    libraries.optional  = collect(libraries.optional)

    -- shortcut and helper

    local setbytecode  = lua.setbytecode
    local getbytecode  = lua.getbytecode
    local callbytecode = lua.callbytecode or function(i)
        local b = getbytecode(i)
        if type(b) == "function" then
            b()
            return true
        else
            return false
        end
    end

    local function init(start)
        local i = start
        local t = os.clock()
        while true do
         -- local b = callbytecode(i)
            local e, b = pcall(callbytecode,i)
            if not e then
                print(string.format("fatal error : unable to load bytecode register %%i, maybe wipe the cache first\n",i))
                os.exit()
            end
            if b then
                setbytecode(i,nil) ;
                i = i + 1
            else
                break
            end
        end
        return i - start, os.clock() - t
    end

    -- the stored tables and modules

    storage.noftables , storage.toftables  = init(0)
    storage.nofmodules, storage.tofmodules = init(%s)

    if modules then
        local loaded = package.loaded
        for module, _ in next, modules do
            loaded[module] = true
        end
    end

    texconfig.init = function() end

end

CONTEXTLMTXMODE = 1

-- we provide a qualified path

callback.register('find_format_file',function(name)
    texconfig.formatname = name
    return name
end)

-- done, from now on input and callbacks are internal
]]

local keys = {
    "buffersize", "expandsize", "filesize", "fontsize", "hashsize", "inputsize",
    "languagesize", "marksize", "insertsize", "nestsize", "nodesize", "parametersize", "poolsize",
    "savesize", "stringsize", "tokensize", "errorlinesize", "halferrorlinesize",
}

local function makestub()
    local name = environment.jobname .. ".lui"
    report("creating stub file %a using directives:",name)
    report()
    firsttable = firsttable or lua.firstbytecode
    local t = {
        "-- This file is generated, don't change it!\n"
    }
    for i=1,#keys do
        local target = keys[i]
        local key = "luametatex." .. target
        local val = directives.value(key)
        if type(val) == "number" then
            val = { size = val }
        end
        if type(val) == "table" then
            local s = { }
            local v = val.size if v then s[#s+1] = format("size = %10i",v) end
            local v = val.plus if v then s[#s+1] = format("plus = %10i",v) end
            local v = val.step if v then s[#s+1] = format("step = %10i",v) end
            if #s > 0 then
                s = format("%-17s = { %s }",target,concat(s,", "))
                report("  %s",s)
                t[#t+1] = "texconfig." .. s
            end
        end
    end
    t[#t+1] = ""
    t[#t+1] = format(stub,firsttable)
    io.savedata(name,concat(t,"\n"))
    report()
end

lua.registerinitexfinalizer(makestub,"create stub file")