Re: Error: attempt to index a nil value

["Hans Åberg via ntg-context" <ntg-context@ntg.nl>]

> On 13 Oct 2021, at 22:34, Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
> On 10/13/2021 6:54 PM, Hans Åberg wrote:
>>> On 13 Oct 2021, at 18:37, Hans Hagen <j.hagen@xs4all.nl> wrote:
>>> 
>>> On 10/13/2021 6:01 PM, Hans Åberg via ntg-context wrote:
>>>> I was suggested a long ago to hack the file
>>>>  /usr/local/texlive/2021/texmf-dist/tex/generic/context/luatex/luatex-math.tex
>>>> and use LuaTeX directly, now using Version 1.13.2 (TeX Live 2021), but I get this error:
>>>> (./luaotfload.sty
>>>> (/usr/local/texlive/2021/texmf-dist/tex/latex/base/ltluatex.tex))
>>>> (./luatex-math-modified.tex[\directlua]:1: attempt to index a nil value (global
>>>> 'arguments')
>>>> stack traceback:
>>>> 	[\directlua]:1: in main chunk.
>>>> l.132     }
>>>> ? …
>>>> It is from this segment in the modified luatex-math.tex:
>>>> \ifdefined\directlua
>>>>    \directlua {
>>>>        if arguments["mtx:lucidabright"] then
>>>>            tex.print("\string\\lucidabright")
>>>>        else
>>>>            tex.print("\string\\latinmodern")
>>>>        end
>>>>    }
>>>> \fi
>>>> Is there a workaround? —I may ditch this setup in favour of using 'context' directly, so it is not so important if there is no fix.
>>> I have no clue ..
>> Has not stuff been moved from LuaTeX to ConTeXt? —If so, I thought it might have something with that to do.
> 
> luatex is just a tex engine and context is a macro package where context mkiv is geared for luatex; the context fontloader has a generic core so it can be used in plain and for latex some write a wrapper around that font hndler for latex that evolved over years
> 
> i have no clue why you get "(./luaotfload.sty ..." but it is not context that you run there (and i can't imagine some plain format loading it either)

I think that LaTeX extracted some parts out of ConTeXt for use with LuaTeX only for font loading, and that is why I have it, not remembering the details. I think I saw that LuaTeX a few years had more font loading stuff, but that was moved to ConTeXt, but you show know better, as it would then would have been you did it. :-)

>>> it looks like you load a latex style so I suppose that 'arguments' is no longer defined there (as it worked for you in the past).
>> It does not contain it; it a copy in the same directory that has never changed.
> 
> hm, but i have no clue what this "mtx:..." does

It is line 97-105 in
/usr/local/texlive/2021/texmf-dist/tex/generic/context/luatex/luatex-math.tex

I have not done anything to that part, just adding some support for the STIX font.

>>> Maybe 'arguments' lives in some namespace?
>>> 
>>> \directlua {for k, v in pairs(_G) do print(k,v) end}
>>> 
>>> This will show you what is in the global namespace, maybe 'arg'?
>> If I put this code in right before the \ifdefined\directlua it prints a lot of "nil".
> 
> print(k,v) should print two values, key and value

I may have not used it right, just copying it in right above line 97.


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