(Please keep me CC'd as I'm not subscribed to the list)
Hi, I'm the lua-widow-control author.
> lua error > lua error on line 74 in file
>
/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl
>
> The odd thing is that line 75 of the t-lua-widow-control file is empty.
The \setuplwc command ends on line 74, which then triggers
\everysetuplwc which then calls \ctxlua{lwc.enable_callbacks()}. This
fails since lwc is undefined because the Lua file isn't loaded because
ConTeXt can't seem to find the file.
In Plain LuaTeX and LuaLaTeX, a missing Lua file is a fatal error:
$ luatex "\nonstopmode\directlua{require 'not-a-real-file'}\bye"
This is LuaTeX, Version 1.13.2 (TeX Live 2021/W32TeX)
restricted system commands enabled.
[\directlua]:1: module 'not-a-real-file' not found:
no field package.preload['not-a-real-file']
[kpse lua searcher] file not found: 'not-a-real-file'
stack traceback:
[C]: in function 'require'
[\directlua]:1: in main chunk.
<*> \nonstopmode\directlua{require 'not-a-real-file'}
\bye
(see the transcript file for additional information)
warning (pdf backend): no pages of output.
Transcript written on texput.log.
so I'm a little surprised that ConTeXt just issues a warning here when
it can't find the file:
resolvers > lua > unknown file 'lua-widow-control.lua'
> when it says it doesn't know the lua-widow-control.lua file. I don't see
> any mention of this file within the t-lua-widow-control module.
lua-widow-control.lua is loaded at line 63 of the .mkxl:
\ctxloadluafile{lua-widow-control}
> Could it be that this module is not yet mature for lmtx
Lua-widow-control is certainly more stable with Plain/LaTeX, but it
usually runs fine with LMTX. The entire lwc manual is written in
ConTeXt/LMTX so I (usually) notice pretty quickly when things break.
The only real "issue" with LMTX is that the engine changes pretty
quickly, so lwc may sometimes be broken for a few days between an engine
update and whenever I push out a fix. This doesn't happen with
Plain/LaTeX since the LuaTeX engine is mostly frozen.
Interestingly, the MkXL version of lwc actually predates the MkIV
version, although only by a few months.
> I have \usemodule[lua-widow-control] in my tex document, and
> I haven't forgotten to do the prescribed mtxrun --generate after
> including the module in my third-party folder of my luametatex
> installation on Arch.
Hmm, that's odd then. I'm not entirely sure why this is happening, so
I'm going to take a random guess:
Maybe you installed lwc using a zipfile from either GitHub or the
ConTeXt Garden modules site, then you copied the files into your
texmf-modules/ folder, *but* you only copied the "tex/context/" folder
and not all of the folders in the "tex" folder. The
"lua-widow-control.lua" file is in the "tex/luatex/" folder, so if you
didn't also copy that across you're going to have problems.
Again, just a random guess. If that doesn't work, you could maybe try
running
context --make
but I doubt that that would fix anything here. You could also try
deleting the filename cache files at:
{CONTEXT}/texmf-cache/luametatex-cache/context/*/trees/*.lu?
then rerunning
mtxrun --generate
I've never deleted those files before, but it's in a folder called
"cache" so it's _probably_ safe to delete (make a backup just in case
though).
If none of that works, then the issue could be something else on your
end, or I could have screwed something up in lwc. In that case, try running
find /opt/luametatex/texmf-modules/ -path '*widow*' -print
and
mtxrun --find-file lua-widow-control.lua
and reply with the output.
Oh, and one more note. ConTeXt version "2022-04-11 19:20" renamed some
of the engine Lua functions, so make sure to update to lwc v2.0.6 (if
you're using a recent ConTeXt version). Otherwise after you fix the
"unknown file" error, you would get an "attempt to call a nil value"
error which isn't any better.
Let me know if you have any other issues.
-- Max
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