lua-widow-control module error in LMTX

lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

Hi,
I would like to know if anyone has experienced the same error with the 
lua-widow-control module when compiling the pdf:

modules > 'lua-widow-control' is loaded
open source > level 2, order 3, name 
'/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl'.
resolvers > lua > unknown file 'lua-widow-control.lua'
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.
On the other hand, I confess that I don't know what "resolvers" means 
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.

Could it be that this module is not yet mature for lmtx, or am I missing 
something? 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.

Kind regards,

Edu

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

El 21/4/22 a las 22:08, Eduardo Bohoyo escribió:
> Hi,
> I would like to know if anyone has experienced the same error with the 
> lua-widow-control module when compiling the pdf:
>
> modules > 'lua-widow-control' is loaded
> open source > level 2, order 3, name 
> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl'.
> resolvers > lua > unknown file 'lua-widow-control.lua'
> lua error > lua error on line 75 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.
> On the other hand, I confess that I don't know what "resolvers" means 
> 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.
>
> Could it be that this module is not yet mature for lmtx, or am I 
> missing something? 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.
>
> Kind regards,
>
> Edu
>
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Max Chernoff via ntg-context]

(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
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

[-- Attachment #1.1: Type: text/plain, Size: 6222 bytes --]

Hi, Max:

First things first.  I want to acknowledge and thank you for the tough 
mission that surely involves maintaining this module for the benefit of 
the TeX community and, most especially, for LMTX in particular, due to 
the very reasons you have just explained.

Regarding your remarks, you are right in your assumptions: I didn't have 
the required lua file installed in its corresponding folder. That's what 
I was missing, and, logically, what made my compilation crash.

To make my confusion even worse, I had done a strict search inside the 
mkxl code. It wouldn't take me to line 63 because I had added the 
extension (lua-widow-control.lua, not just lua-widow-control).

Anyway, a mess only due to my ignorance.

Now I finally get the pdf. But unfortunately, this "new" pdf is the same 
with the module uncommented as when I had it commented. There is no 
difference at all. And you're right: even context --make doesn't solve 
the problem. To give you an idea, although my dummy document has 78 
pages, only 55 can really be said to be dummy text that can benefit from 
the module. Well, only in those 55 pages I have 2 orphans, 5 widows and 
6 broken hyphens.

I have read several times all the options of the module in the 
/lua-widow-control.pdf/ document, but I don't even dare to mess with 
those options because it seems to me very radical that my output pdf is 
the same with the module uncommented in my code.

Of course, mtxrun --find-file lua-widow-control.lua yields what you 
would expect:

/opt/luametatex/texmf-modules/tex/luatex/lua-widow-control/lua-widow-control.lua

Thanks again for your work and yours observations.

Edu.

El 25/4/22 a las 22:00, Max Chernoff escribió:
> (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

[-- Attachment #1.2: Type: text/html, Size: 8057 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Max Chernoff via ntg-context]

On 2022-04-25 6:51 p.m., Eduardo Bohoyo wrote:
> First things first.  I want to acknowledge and thank you for the tough 
> mission that surely involves maintaining this module for the benefit of 
> the TeX community and, most especially, for LMTX in particular, due to 
> the very reasons you have just explained.

Well thanks :) These days I write most of my documents in LMTX, so the LMTX
support is pretty self-serving -- I'm admittedly surprised that there's
another lwc + LMTX user.

> Regarding your remarks, you are right in your assumptions: I didn't have 
> the required lua file installed in its corresponding folder. That's what 
> I was missing, and, logically, what made my compilation crash.

Yeah, it's a pretty easy mistake to make. For Knuth TeX, shared files go
in texmf/tex/generic and Plain-specific files go in texmf/tex/plain, but
with LuaTeX there's just texmf/tex/luatex so it gets a little confusing.

> Now I finally get the pdf. But unfortunately, this "new" pdf is the same 
> with the module uncommented as when I had it commented. There is no 
> difference at all. And you're right: even context --make doesn't solve 
> the problem. To give you an idea, although my dummy document has 78 
> pages, only 55 can really be said to be dummy text that can benefit from 
> the module. Well, only in those 55 pages I have 2 orphans, 5 widows and 
> 6 broken hyphens.

So the first step here is to check the log file. If you see lines like

     module          > lua-widow-control > Widow/orphan detected. Attempting to remove.
     module          > lua-widow-control > Widow/Orphan NOT removed on page X.

then that means that lwc found a widow/orphan, but gave up. This usually
only happens if the page has only really short paragraphs, but it can also
happen if there aren't any paragraphs that both start and finish on the page.
I've got some neat graphs for this (see the upcoming TUGboat issue), but with
default settings this should happen for much less than 10% of potential
widows/orphans, so it seems unlikely that this is happening for every page.

If this actually is the issue, then you can try raising the "emergencystretch"
value in "\setuplwc", but that's probably going to give terrible results. The real
solution is to rewrite something, but that should usually be pretty rare.

---

If you see lines like

     module          > lua-widow-control > Widow/orphan detected. Attempting to remove.
     module          > lua-widow-control > Widow/orphan successfully removed at paragraph X on page Y.

but the widows/orphans weren't actually removed, then something really weird
is going on and definitely means that there's a bug in lwc. Rerun the document with

     \setuplwc[debug=true]

immediately after "\usemodule[lua-widow-control]" and either reply with the log
or post a new issue on the lwc GitHub.

---

If you only see

     modules         > 'lua-widow-control' is loaded

but not any other lines mentioning lwc, then something weird is going on, and
lwc is loaded but not enabled. If this is the case, same as last time: enable
debug mode and reply with the log.

---

If you don't see

     modules         > 'lua-widow-control' is loaded

at all, then you're not actually loading lwc. This probably means that ConTeXt
can't find the file, there should hopefully be clues somewhere in the log file.

> Thanks again for your work and yours observations.

No problem; glad to help.

-- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

Hi:

No line such as "Widow/orphan detected. Attempting to delete".

I see interleaved new groups with the same line always repeating a 
warning message throughout the whole file. In short, there are 613 new 
lines with the message "luatex warning > tex: left parfill skip is gone".
But I didn't give it any importance, because I interpreted that they 
could be inherent to the module.

I can see "modules         > 'lua-widow-control' is loaded".

But, luckily, I can also see this:

open source     > level 2, order 4, name 
'/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl'
resolvers       > lua > loading file 
'/opt/luametatex/texmf-modules/tex/luatex/lua-widow-control/lua-widow-control.lua' 
succeeded
close source    > level 2, order 4, name 
'/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl'
module          > lua-widow-control > Already enabled


On the other hand, the distribution and size of my paragraphs take great 
care that their "design" optimises the module's goodness, except, of 
course, for the first pages of each of the nine dummy text chapters 
(they start at a third of a page).
But it is very curious that, even so, only the two orphan lines I 
mentioned, and only two of the five widows relate to two or three of 
those "supposedly problematic" first chapter pages (as I said, nine in 
total). And the case of the broken scripts is even stranger: only two of 
the six breakages concern a couple of those early chapter pages.

I will go over the lua-widow-control.pdf document once more in case 
there is a tiny detail I am missing, but I think, if I keep going at 
this pace, I will end up learning it by heart.

Well, joking aside, thanks again for your advice, Max.

Edu.

El 26/4/22 a las 4:42, Max Chernoff escribió:
> On 2022-04-25 6:51 p.m., Eduardo Bohoyo wrote:
>> First things first.  I want to acknowledge and thank you for the 
>> tough mission that surely involves maintaining this module for the 
>> benefit of the TeX community and, most especially, for LMTX in 
>> particular, due to the very reasons you have just explained.
>
> Well thanks :) These days I write most of my documents in LMTX, so the 
> LMTX
> support is pretty self-serving -- I'm admittedly surprised that there's
> another lwc + LMTX user.
>
>> Regarding your remarks, you are right in your assumptions: I didn't 
>> have the required lua file installed in its corresponding folder. 
>> That's what I was missing, and, logically, what made my compilation 
>> crash.
>
> Yeah, it's a pretty easy mistake to make. For Knuth TeX, shared files go
> in texmf/tex/generic and Plain-specific files go in texmf/tex/plain, but
> with LuaTeX there's just texmf/tex/luatex so it gets a little confusing.
>
>> Now I finally get the pdf. But unfortunately, this "new" pdf is the 
>> same with the module uncommented as when I had it commented. There is 
>> no difference at all. And you're right: even context --make doesn't 
>> solve the problem. To give you an idea, although my dummy document 
>> has 78 pages, only 55 can really be said to be dummy text that can 
>> benefit from the module. Well, only in those 55 pages I have 2 
>> orphans, 5 widows and 6 broken hyphens.
>
> So the first step here is to check the log file. If you see lines like
>
>     module          > lua-widow-control > Widow/orphan detected. 
> Attempting to remove.
>     module          > lua-widow-control > Widow/Orphan NOT removed on 
> page X.
>
> then that means that lwc found a widow/orphan, but gave up. This usually
> only happens if the page has only really short paragraphs, but it can 
> also
> happen if there aren't any paragraphs that both start and finish on 
> the page.
> I've got some neat graphs for this (see the upcoming TUGboat issue), 
> but with
> default settings this should happen for much less than 10% of potential
> widows/orphans, so it seems unlikely that this is happening for every 
> page.
>
> If this actually is the issue, then you can try raising the 
> "emergencystretch"
> value in "\setuplwc", but that's probably going to give terrible 
> results. The real
> solution is to rewrite something, but that should usually be pretty rare.
>
> ---
>
> If you see lines like
>
>     module          > lua-widow-control > Widow/orphan detected. 
> Attempting to remove.
>     module          > lua-widow-control > Widow/orphan successfully 
> removed at paragraph X on page Y.
>
> but the widows/orphans weren't actually removed, then something really 
> weird
> is going on and definitely means that there's a bug in lwc. Rerun the 
> document with
>
>     \setuplwc[debug=true]
>
> immediately after "\usemodule[lua-widow-control]" and either reply 
> with the log
> or post a new issue on the lwc GitHub.
>
> ---
>
> If you only see
>
>     modules         > 'lua-widow-control' is loaded
>
> but not any other lines mentioning lwc, then something weird is going 
> on, and
> lwc is loaded but not enabled. If this is the case, same as last time: 
> enable
> debug mode and reply with the log.
>
> ---
>
> If you don't see
>
>     modules         > 'lua-widow-control' is loaded
>
> at all, then you're not actually loading lwc. This probably means that 
> ConTeXt
> can't find the file, there should hopefully be clues somewhere in the 
> log file.
>
>> Thanks again for your work and yours observations.
>
> No problem; glad to help.
>
> -- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

Erratum: When I wrote script, I meant hyphen.

El 26/4/22 a las 11:45, Eduardo Bohoyo escribió:
> Hi:
>
> No line such as "Widow/orphan detected. Attempting to delete".
>
> I see interleaved new groups with the same line always repeating a 
> warning message throughout the whole file. In short, there are 613 new 
> lines with the message "luatex warning > tex: left parfill skip is gone".
> But I didn't give it any importance, because I interpreted that they 
> could be inherent to the module.
>
> I can see "modules         > 'lua-widow-control' is loaded".
>
> But, luckily, I can also see this:
>
> open source     > level 2, order 4, name 
> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl'
> resolvers       > lua > loading file 
> '/opt/luametatex/texmf-modules/tex/luatex/lua-widow-control/lua-widow-control.lua' 
> succeeded
> close source    > level 2, order 4, name 
> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl'
> module          > lua-widow-control > Already enabled
>
>
> On the other hand, the distribution and size of my paragraphs take 
> great care that their "design" optimises the module's goodness, 
> except, of course, for the first pages of each of the nine dummy text 
> chapters (they start at a third of a page).
> But it is very curious that, even so, only the two orphan lines I 
> mentioned, and only two of the five widows relate to two or three of 
> those "supposedly problematic" first chapter pages (as I said, nine in 
> total). And the case of the broken scripts is even stranger: only two 
> of the six breakages concern a couple of those early chapter pages.
>
> I will go over the lua-widow-control.pdf document once more in case 
> there is a tiny detail I am missing, but I think, if I keep going at 
> this pace, I will end up learning it by heart.
>
> Well, joking aside, thanks again for your advice, Max.
>
> Edu.
>
> El 26/4/22 a las 4:42, Max Chernoff escribió:
>> On 2022-04-25 6:51 p.m., Eduardo Bohoyo wrote:
>>> First things first.  I want to acknowledge and thank you for the 
>>> tough mission that surely involves maintaining this module for the 
>>> benefit of the TeX community and, most especially, for LMTX in 
>>> particular, due to the very reasons you have just explained.
>>
>> Well thanks :) These days I write most of my documents in LMTX, so 
>> the LMTX
>> support is pretty self-serving -- I'm admittedly surprised that there's
>> another lwc + LMTX user.
>>
>>> Regarding your remarks, you are right in your assumptions: I didn't 
>>> have the required lua file installed in its corresponding folder. 
>>> That's what I was missing, and, logically, what made my compilation 
>>> crash.
>>
>> Yeah, it's a pretty easy mistake to make. For Knuth TeX, shared files go
>> in texmf/tex/generic and Plain-specific files go in texmf/tex/plain, but
>> with LuaTeX there's just texmf/tex/luatex so it gets a little confusing.
>>
>>> Now I finally get the pdf. But unfortunately, this "new" pdf is the 
>>> same with the module uncommented as when I had it commented. There 
>>> is no difference at all. And you're right: even context --make 
>>> doesn't solve the problem. To give you an idea, although my dummy 
>>> document has 78 pages, only 55 can really be said to be dummy text 
>>> that can benefit from the module. Well, only in those 55 pages I 
>>> have 2 orphans, 5 widows and 6 broken hyphens.
>>
>> So the first step here is to check the log file. If you see lines like
>>
>>     module          > lua-widow-control > Widow/orphan detected. 
>> Attempting to remove.
>>     module          > lua-widow-control > Widow/Orphan NOT removed on 
>> page X.
>>
>> then that means that lwc found a widow/orphan, but gave up. This usually
>> only happens if the page has only really short paragraphs, but it can 
>> also
>> happen if there aren't any paragraphs that both start and finish on 
>> the page.
>> I've got some neat graphs for this (see the upcoming TUGboat issue), 
>> but with
>> default settings this should happen for much less than 10% of potential
>> widows/orphans, so it seems unlikely that this is happening for every 
>> page.
>>
>> If this actually is the issue, then you can try raising the 
>> "emergencystretch"
>> value in "\setuplwc", but that's probably going to give terrible 
>> results. The real
>> solution is to rewrite something, but that should usually be pretty 
>> rare.
>>
>> ---
>>
>> If you see lines like
>>
>>     module          > lua-widow-control > Widow/orphan detected. 
>> Attempting to remove.
>>     module          > lua-widow-control > Widow/orphan successfully 
>> removed at paragraph X on page Y.
>>
>> but the widows/orphans weren't actually removed, then something 
>> really weird
>> is going on and definitely means that there's a bug in lwc. Rerun the 
>> document with
>>
>>     \setuplwc[debug=true]
>>
>> immediately after "\usemodule[lua-widow-control]" and either reply 
>> with the log
>> or post a new issue on the lwc GitHub.
>>
>> ---
>>
>> If you only see
>>
>>     modules         > 'lua-widow-control' is loaded
>>
>> but not any other lines mentioning lwc, then something weird is going 
>> on, and
>> lwc is loaded but not enabled. If this is the case, same as last 
>> time: enable
>> debug mode and reply with the log.
>>
>> ---
>>
>> If you don't see
>>
>>     modules         > 'lua-widow-control' is loaded
>>
>> at all, then you're not actually loading lwc. This probably means 
>> that ConTeXt
>> can't find the file, there should hopefully be clues somewhere in the 
>> log file.
>>
>>> Thanks again for your work and yours observations.
>>
>> No problem; glad to help.
>>
>> -- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Max Chernoff via ntg-context]

Quick question before I begin: are you using any especially "interesting"
ConTeXt features? By "interesting" I mean things like grid typesetting,
pagecolumns, bidirectional text, etc. I haven't tested lwc with every
possible ConTeXt feature, so there may be some adverse interaction. If
you are using something like this, try disabling it and see if that solves
anything (then let me know so that I can fix it!)

On 2022-04-26 3:45 a.m., Eduardo Bohoyo wrote:

> I can see "modules         > 'lua-widow-control' is loaded".
> 
> But, luckily, I can also see this:
> 
> open source     > level 2, order 4, name 
> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl' 
> 
> resolvers       > lua > loading file 
> '/opt/luametatex/texmf-modules/tex/luatex/lua-widow-control/lua-widow-control.lua' 
> succeeded
> close source    > level 2, order 4, name 
> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl' 
> 
> module          > lua-widow-control > Already enabled

Ok, so this is good; lwc is for sure being loaded successfully.

> No line such as "Widow/orphan detected. Attempting to delete".
> 
> I see interleaved new groups with the same line always repeating a 
> warning message throughout the whole file. In short, there are 613 new 
> lines with the message "luatex warning > tex: left parfill skip is gone".
> But I didn't give it any importance, because I interpreted that they 
> could be inherent to the module.

Well this at least narrows the issue down quite a bit. Lwc runs in pretty
much two stages: when a paragraph has finished being broken by TeX, lwc
saves the paragraph. The second stage is ran just before each time the
output routine is triggered so that lwc can remove the widows and orphans.

Due to an lwc bug, the first stage results in the "left parfill skip"
warning being printed twice for each paragraph. Normally this is quite
annoying, but here it is good -- we know for sure that the first stage
is running just fine.

It is the second stage where you should get the "Widow/orphan detected"
message, but this isn't happening. The code here is at lwc.lua:362-388.

Here is a list of all possible reasons, in order of likelihood, why
"Widow/orphan detected" wouldn't be printed when there is actually
a widow or orphan:

(Just listing all of these to make sure that *I* don't forget anything. I'd
  say that 1 and 2 are the only ones that are actually likely -- you can
  probably ignore all of the others)

  1. "\clubpenalty" and/or "\widowpenalty" are either zero or infinite

     In these cases, lwc can't distinguish a widow or orphan from other
     penalties, so it doesn't do anything. You can check for this with

         \showthe\widowpenalty
         \showthe\clubpenalty

     some time after "\starttext". This will print the values to the log
     file. The values should probably be "1", but things like "150" and
     "5000" are fine too. If you see negative values, "0", or values
     greater than ten thousand, then something is wrong here.

  2. Something is "hiding" the widow/orphan penalties from lwc.

     Something like "\vadjust{\penalty X}" or the e-TeX "\-penalties"
     commands could potentially do this.

     One potential solution for (a subset of) this problem would be to
     modify lwc.mkxl to insert "\directsetup{*reset}" at line 52, to
     get:

         \startsetups[*default]
             \directsetup{*reset}
             \clubpenalty=\lwcparameter{orphanpenalty}
             \widowpenalty=\lwcparameter{widowpenalty}
             \displaywidowpenalty=\lwcparameter{widowpenalty}
             \brokenpenalty=\lwcparameter{brokenpenalty}
         \stopsetups

     If that doesn't do anything, keep the above modifications but also insert

         \setups[*default]

     after "\starttext" in your test document.

  3. Lwc hasn't saved any paragraphs since the last output routine.

     Since we know that the first stage is running, this shouldn't be
     possible unless there is a weird bug somewhere else.

  4. A weird engine/format bug.

     The LMTX test file was successful on Debian x86_64 three days ago

         https://github.com/gucci-on-fleek/lua-widow-control/runs/6144354147?check_suite_focus=true

     so something quite weird would have to be going on here.

  5. Something is overwriting the "pre_output_filter" callback.

     Now this is an interesting one. ConTeXt has frozen most of the core
     engine callbacks, but "pre_output_filter" is unfrozen and unassigned.
     There is a ConTeXt interface for most of the other callbacks, but here
     I need to fallback to the low-level interface. With this interface,
     you can only register a single callback, so it is possible that some
     other package is overwriting the callback. To test this, the very
     beginning of your document should look like:
     
         \usemodule[lua-widow-control]
         \startluacode
             lwc.callbacks.disable_box_warnings.enable = function () end
             lwc.callbacks.disable_box_warnings.disable = function () end
             callback = nil
         \stopluacode

     If you get a really strange error from some other package/module (not
     lwc), then this may be the issue. Fairly unlikely.

  6. The values of "\club/widowpenalty" change between the paragraph
     being typeset and the output routine being triggered.

     I can't imagine this happening for *every* page in a document
     except unless you are specifically trying to do this. Fairly
     unlikely.

  7. You have the exact Lua code
     
         lwc.callbacks.remove_widows.disable()
     
     written in your document. Exceedingly unlikely.

> On the other hand, the distribution and size of my paragraphs take great 
> care that their "design" optimises the module's goodness, except, of 
> course, for the first pages of each of the nine dummy text chapters 
> (they start at a third of a page).

Well as long as you aren't seeing

     Widow/Orphan NOT removed

in your log file then your text should be fine.

> I will go over the lua-widow-control.pdf document once more in case 
> there is a tiny detail I am missing, but I think, if I keep going at 
> this pace, I will end up learning it by heart.

There's probably not too much else in there -- and the documentation
is a bit of a mess right now anyways.

---

If none of the above solutions solved anything, then what I'll need to
debug further will be for you to insert

     \setuplwc[debug=true]

into your document right after you load lwc. Then, send me the full
log file -- probably as a link since it will be quite large.

Thanks.

-- Max

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Fwd: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

Hello, Max:

As I promised you this morning, I had time this evening to read more 
carefully all your remarks in the last mail. And now I can answer you 
with more basis.

In my particular case, it is not necessary to consider any of the seven 
possible problems you describe from highest to lowest probability. The 
question you asked me in the first paragraph about "interesting" 
features in my ConTeXt code is the key.

When I uncomment grid=yes in my \setuplayout, lwc makes its real 
appearance on the scene. I suppose that in other documents than mine, 
i.e. less complex, this performance would be a success. But in my file 
it is, considering my current aesthetic requirements, a failure. This is 
because for me grid=yes is a non-negotiable part of my code.

As I told you this morning when I sent you my pdf without the module 
activated, but with the layout my way, I understand that lwc can have 
problems with a text whose chapters have capital letters and small caps 
on the first page with less text than on the following pages; with long 
quotations that involve paragraphs of different layout and separated 
from the main text; with more than one footnote in a row, with a 
bibliography at the end with French indentation; with vertical spaces 
separating two lines within the same chapter when in the dummy text 
there is a supposed change of scene within the narrative; with etc. 
etc., etc., etc...

Anyway, after uncommenting grid=yes again, I will send you the log file, 
as you asked me. By the way, I do get some "Widow/Orphan NOT removed on 
page..." in spite of the rest of "successes" that move the final lines 
of my pages away from the result I would like, and that you have seen in 
the pdf I sent you this morning.

Do you want the new pdf with lwc actually acting on my file? Then you 
can get a better idea of what I mean by the end of some pages when I 
comment grid=yes (apart from the mischief that happens with the 
horizontal spaces in some paragraphs of the bibliographic section).

Or, if you prefer, and you need more feedback, I can send you my current 
code to use it as a test bench for " daring " texts.

Greetings,

edu


El 27/4/22 a las 9:14, Max Chernoff escribió:
> Quick question before I begin: are you using any especially "interesting"
> ConTeXt features? By "interesting" I mean things like grid typesetting,
> pagecolumns, bidirectional text, etc. I haven't tested lwc with every
> possible ConTeXt feature, so there may be some adverse interaction. If
> you are using something like this, try disabling it and see if that solves
> anything (then let me know so that I can fix it!)
>
> On 2022-04-26 3:45 a.m., Eduardo Bohoyo wrote:
>
>> I can see "modules         > 'lua-widow-control' is loaded".
>>
>> But, luckily, I can also see this:
>>
>> open source     > level 2, order 4, name 
>> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl' 
>>
>> resolvers       > lua > loading file 
>> '/opt/luametatex/texmf-modules/tex/luatex/lua-widow-control/lua-widow-control.lua' 
>> succeeded
>> close source    > level 2, order 4, name 
>> '/opt/luametatex/texmf-modules/tex/context/third/lua-widow-control/t-lua-widow-control.mkxl' 
>>
>> module          > lua-widow-control > Already enabled
>
> Ok, so this is good; lwc is for sure being loaded successfully.
>
>> No line such as "Widow/orphan detected. Attempting to delete".
>>
>> I see interleaved new groups with the same line always repeating a 
>> warning message throughout the whole file. In short, there are 613 
>> new lines with the message "luatex warning > tex: left parfill skip 
>> is gone".
>> But I didn't give it any importance, because I interpreted that they 
>> could be inherent to the module.
>
> Well this at least narrows the issue down quite a bit. Lwc runs in pretty
> much two stages: when a paragraph has finished being broken by TeX, lwc
> saves the paragraph. The second stage is ran just before each time the
> output routine is triggered so that lwc can remove the widows and orphans.
>
> Due to an lwc bug, the first stage results in the "left parfill skip"
> warning being printed twice for each paragraph. Normally this is quite
> annoying, but here it is good -- we know for sure that the first stage
> is running just fine.
>
> It is the second stage where you should get the "Widow/orphan detected"
> message, but this isn't happening. The code here is at lwc.lua:362-388.
>
> Here is a list of all possible reasons, in order of likelihood, why
> "Widow/orphan detected" wouldn't be printed when there is actually
> a widow or orphan:
>
> (Just listing all of these to make sure that *I* don't forget 
> anything. I'd
>  say that 1 and 2 are the only ones that are actually likely -- you can
>  probably ignore all of the others)
>
>  1. "\clubpenalty" and/or "\widowpenalty" are either zero or infinite
>
>     In these cases, lwc can't distinguish a widow or orphan from other
>     penalties, so it doesn't do anything. You can check for this with
>
>         \showthe\widowpenalty
>         \showthe\clubpenalty
>
>     some time after "\starttext". This will print the values to the log
>     file. The values should probably be "1", but things like "150" and
>     "5000" are fine too. If you see negative values, "0", or values
>     greater than ten thousand, then something is wrong here.
>
>  2. Something is "hiding" the widow/orphan penalties from lwc.
>
>     Something like "\vadjust{\penalty X}" or the e-TeX "\-penalties"
>     commands could potentially do this.
>
>     One potential solution for (a subset of) this problem would be to
>     modify lwc.mkxl to insert "\directsetup{*reset}" at line 52, to
>     get:
>
>         \startsetups[*default]
>             \directsetup{*reset}
>             \clubpenalty=\lwcparameter{orphanpenalty}
>             \widowpenalty=\lwcparameter{widowpenalty}
>             \displaywidowpenalty=\lwcparameter{widowpenalty}
>             \brokenpenalty=\lwcparameter{brokenpenalty}
>         \stopsetups
>
>     If that doesn't do anything, keep the above modifications but also 
> insert
>
>         \setups[*default]
>
>     after "\starttext" in your test document.
>
>  3. Lwc hasn't saved any paragraphs since the last output routine.
>
>     Since we know that the first stage is running, this shouldn't be
>     possible unless there is a weird bug somewhere else.
>
>  4. A weird engine/format bug.
>
>     The LMTX test file was successful on Debian x86_64 three days ago
>
> https://github.com/gucci-on-fleek/lua-widow-control/runs/6144354147?check_suite_focus=true
>
>     so something quite weird would have to be going on here.
>
>  5. Something is overwriting the "pre_output_filter" callback.
>
>     Now this is an interesting one. ConTeXt has frozen most of the core
>     engine callbacks, but "pre_output_filter" is unfrozen and unassigned.
>     There is a ConTeXt interface for most of the other callbacks, but here
>     I need to fallback to the low-level interface. With this interface,
>     you can only register a single callback, so it is possible that some
>     other package is overwriting the callback. To test this, the very
>     beginning of your document should look like:
>             \usemodule[lua-widow-control]
>         \startluacode
>             lwc.callbacks.disable_box_warnings.enable = function () end
>             lwc.callbacks.disable_box_warnings.disable = function () end
>             callback = nil
>         \stopluacode
>
>     If you get a really strange error from some other package/module (not
>     lwc), then this may be the issue. Fairly unlikely.
>
>  6. The values of "\club/widowpenalty" change between the paragraph
>     being typeset and the output routine being triggered.
>
>     I can't imagine this happening for *every* page in a document
>     except unless you are specifically trying to do this. Fairly
>     unlikely.
>
>  7. You have the exact Lua code
>             lwc.callbacks.remove_widows.disable()
>         written in your document. Exceedingly unlikely.
>
>> On the other hand, the distribution and size of my paragraphs take 
>> great care that their "design" optimises the module's goodness, 
>> except, of course, for the first pages of each of the nine dummy text 
>> chapters (they start at a third of a page).
>
> Well as long as you aren't seeing
>
>     Widow/Orphan NOT removed
>
> in your log file then your text should be fine.
>
>> I will go over the lua-widow-control.pdf document once more in case 
>> there is a tiny detail I am missing, but I think, if I keep going at 
>> this pace, I will end up learning it by heart.
>
> There's probably not too much else in there -- and the documentation
> is a bit of a mess right now anyways.
>
> ---
>
> If none of the above solutions solved anything, then what I'll need to
> debug further will be for you to insert
>
>     \setuplwc[debug=true]
>
> into your document right after you load lwc. Then, send me the full
> log file -- probably as a link since it will be quite large.
>
> Thanks.
>
> -- Max
>
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Max Chernoff via ntg-context]

On 2022-04-27 3:59 p.m., Eduardo Bohoyo wrote:
> When I uncomment grid=yes in my \setuplayout, lwc makes its real 
> appearance on the scene.
So it looks like lwc was broken with grid snapping. This surprised me --
I originally wrote lwc *specifically* to use with grid snapping -- but it
looks like I quickly forgot about that goal and never actually tested it
with grids.

> I suppose that in other documents than mine, 
> i.e. less complex, this performance would be a success. But in my file 
> it is, considering my current aesthetic requirements, a failure. This is 
> because for me grid=yes is a non-negotiable part of my code.

I _think_ that I've fixed it now. Can you try the beta version at

     https://github.com/gucci-on-fleek/lua-widow-control/releases/tag/release-47ff19d9804f6ecea64dda59426664680d9756e0

please? Hopefully this solves the issue.
  
> Do you want the new pdf with lwc actually acting on my file? Then you 
> can get a better idea of what I mean by the end of some pages when I 
> comment grid=yes (apart from the mischief that happens with the 
> horizontal spaces in some paragraphs of the bibliographic section).
> 
> Or, if you prefer, and you need more feedback, I can send you my current 
> code to use it as a test bench for " daring " texts.

I was able to reproduce the issue just by adding

     \setuplayout[grid=yes]

to my "standard" test files, so I shouldn't need anything else, provided
that the above beta actually fixes anything. If there are still lingering
issues, then having the TeX source would likely simplify things on my end.

-- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Henning Hraban Ramm via ntg-context]

Am 28.04.22 um 09:25 schrieb Max Chernoff via ntg-context:
> I _think_ that I've fixed it now. Can you try the beta version at
>      
> https://github.com/gucci-on-fleek/lua-widow-control/releases/tag/release-47ff19d9804f6ecea64dda59426664680d9756e0 
> 
> please? Hopefully this solves the issue.

Hi Max,
thank you for this module that I didn’t know.

I’m afraid the above release introduced a bug; while the offical release 
ran through, I now get:

module          > lua-widow-control > Widow/orphan detected. Attempting 
to remove.
lua error       > lua error on line 112 in file de/c_intro.tex:

callback error: 
...local/tex/luatex/lua-widow-control/lua-widow-control.lua:510: attempt 
to perform arithmetic on a nil value (field 'height')
stack traceback:
	...local/tex/luatex/lua-widow-control/lua-widow-control.lua:510: in 
function <...local/tex/luatex/lua-widow-control/lua-widow-control.lua:360>

My book is not in grid mode.


Hraban
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

Hi Max:

Here testing that beta version.

As you know, my book is in grid mode, but I get the same error message 
as Hraban when the compilation crashes.

However, when I comment grid again in my document, it does compile the pdf.

Thanks,

Edu

El 28/4/22 a las 9:25, Max Chernoff escribió:
> On 2022-04-27 3:59 p.m., Eduardo Bohoyo wrote:
>> When I uncomment grid=yes in my \setuplayout, lwc makes its real 
>> appearance on the scene.
> So it looks like lwc was broken with grid snapping. This surprised me --
> I originally wrote lwc *specifically* to use with grid snapping -- but it
> looks like I quickly forgot about that goal and never actually tested it
> with grids.
>
>> I suppose that in other documents than mine, i.e. less complex, this 
>> performance would be a success. But in my file it is, considering my 
>> current aesthetic requirements, a failure. This is because for me 
>> grid=yes is a non-negotiable part of my code.
>
> I _think_ that I've fixed it now. Can you try the beta version at
>
> https://github.com/gucci-on-fleek/lua-widow-control/releases/tag/release-47ff19d9804f6ecea64dda59426664680d9756e0
>
> please? Hopefully this solves the issue.
>
>> Do you want the new pdf with lwc actually acting on my file? Then you 
>> can get a better idea of what I mean by the end of some pages when I 
>> comment grid=yes (apart from the mischief that happens with the 
>> horizontal spaces in some paragraphs of the bibliographic section).
>>
>> Or, if you prefer, and you need more feedback, I can send you my 
>> current code to use it as a test bench for " daring " texts.
>
> I was able to reproduce the issue just by adding
>
>     \setuplayout[grid=yes]
>
> to my "standard" test files, so I shouldn't need anything else, provided
> that the above beta actually fixes anything. If there are still lingering
> issues, then having the TeX source would likely simplify things on my 
> end.
>
> -- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Henning Hraban Ramm via ntg-context]

Am 28.04.22 um 12:54 schrieb Eduardo Bohoyo via ntg-context:
> Hi Max:
> 
> Here testing that beta version.
> 
> As you know, my book is in grid mode, but I get the same error message 
> as Hraban when the compilation crashes.
> 
> However, when I comment grid again in my document, it does compile the pdf.

Oops, my book *was* accidentally in grid mode. It made no sense. No 
wonder I had troubles with spacing.

But I get the error with your beta release also without grid mode.

Hraban
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Max Chernoff via ntg-context]

On 2022-04-28 3:30 a.m., Henning Hraban Ramm wrote:
> I’m afraid the above release introduced a bug; while the offical release 
> ran through, I now get:
> 
> module          > lua-widow-control > Widow/orphan detected. Attempting 
> to remove.
> lua error       > lua error on line 112 in file de/c_intro.tex:
> 
> callback error: 
> ...local/tex/luatex/lua-widow-control/lua-widow-control.lua:510: attempt 
> to perform arithmetic on a nil value (field 'height')
> stack traceback:
>      ...local/tex/luatex/lua-widow-control/lua-widow-control.lua:510: in 
> function <...local/tex/luatex/lua-widow-control/lua-widow-control.lua:360>

On 2022-04-28 4:54 a.m., Eduardo Bohoyo wrote:
> Here testing that beta version.
> 
> As you know, my book is in grid mode, but I get the same error message 
> as Hraban when the compilation crashes.
> 
> However, when I comment grid again in my document, it does compile the pdf.

Well that's why it was a beta :) Looks like I made some questionable assumptions
about the order of the hlist/baselineskip nodes, so the module completely broke
with things as simple as section headings.

Hopefully this new beta should fix things:

     https://github.com/gucci-on-fleek/lua-widow-control/releases/tag/release-5e240b2ebb76f33c32ecbc673af09a1c64773033

Grid snapping is a little peculiar, so let me know if you find any more bugs.

And thanks for the bug reports.
-- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Eduardo Bohoyo via ntg-context]

Now, I don't have any widows in my document, and I only count 2 broken 
hyphens.

However, I think this is at the expense of the shenanigans the module 
has "perpetrated" elsewhere, because, apart from the crazy horizontal 
spacing of some paragraph in the bibliography, the module lies to me in 
the log.

Yes, the log output fools me. There is no "Widow/Orphan NOT removed". 
But this is not true:

To the 2 broken hyphens must be added 4 orphan lines that the log claims 
to have resolved. But what worries me the most is that it counts as 
successful one occasion with an empty line, another occasion with two 
empty lines in a row, and 4 occasions with no less than 7 empty lines in 
a row at the beginning of a chapter.

I don't know if this information can provide any more clues to adjust 
the module for the grid mode, but I hope it helps.

Greetings,

Edu.

El 29/4/22 a las 2:38, Max Chernoff escribió:
> On 2022-04-28 3:30 a.m., Henning Hraban Ramm wrote:
>> I’m afraid the above release introduced a bug; while the offical 
>> release ran through, I now get:
>>
>> module          > lua-widow-control > Widow/orphan detected. 
>> Attempting to remove.
>> lua error       > lua error on line 112 in file de/c_intro.tex:
>>
>> callback error: 
>> ...local/tex/luatex/lua-widow-control/lua-widow-control.lua:510: 
>> attempt to perform arithmetic on a nil value (field 'height')
>> stack traceback:
>>      ...local/tex/luatex/lua-widow-control/lua-widow-control.lua:510: 
>> in function 
>> <...local/tex/luatex/lua-widow-control/lua-widow-control.lua:360>
>
> On 2022-04-28 4:54 a.m., Eduardo Bohoyo wrote:
>> Here testing that beta version.
>>
>> As you know, my book is in grid mode, but I get the same error 
>> message as Hraban when the compilation crashes.
>>
>> However, when I comment grid again in my document, it does compile 
>> the pdf.
>
> Well that's why it was a beta :) Looks like I made some questionable 
> assumptions
> about the order of the hlist/baselineskip nodes, so the module 
> completely broke
> with things as simple as section headings.
>
> Hopefully this new beta should fix things:
>
> https://github.com/gucci-on-fleek/lua-widow-control/releases/tag/release-5e240b2ebb76f33c32ecbc673af09a1c64773033
>
> Grid snapping is a little peculiar, so let me know if you find any 
> more bugs.
>
> And thanks for the bug reports.
> -- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua-widow-control module error in LMTX

[Max Chernoff via ntg-context]

Hi all,

I've pushed lwc v2.1.0 to CTAN and the Garden Modules site. This new 
version fully supports the ConTeXt grid snapping (MkIV/MkXL), and it 
also adds some improved logging. You can download this directly at

     https://modules.contextgarden.net/dl/lua-widow-control-v2.1.0.zip

I believe that this resolves all of the issues in this thread, but as 
always, feel free to let me know if something doesn't work.

Thanks,
-- Max
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________