[tex4ht] split environment and exerquiz package

[Nasser M. Abbasi]

On 1/7/2021 3:34 PM, Tomas Davidek wrote:
> Hello,
> 
>      I made several tests with tex4ht. The tool nicely converts most of
> the objects/environments, but I noticed two problems:
> 
> 1. split environment
> 
> I use that for typesetting long formulas, for instance
> 
> This is my very long formula
> 
> \begin{displaymath}
>      \begin{split}
>         \tau(\eta^0) & = \frac{\hbar}{\Gamma(\eta^0)} =
>         \frac{\hbar c}{c \Gamma(\eta^0)} =
>         \frac{0{,}197~\gev\cdot\mathrm{fm}}{3\cdot
>           10^{8}~\mathrm{m}\cdot\mathrm{s}^{-1}\times 1{,}30~\mathrm{keV}}
>           = \\
>         & = \frac{0{,}197\cdot 10^{-15}~\gev\cdot\mathrm{m}}{3\cdot
>           10^{8}~\mathrm{m}\cdot\mathrm{s}^{-1}\times 1{,}30\cdot
>           10^{-6}~\mathrm{GeV} = % \nonumber\\
>         0{,}0505\cdot 10^{-17}~\mathrm{s} = 5{,}05\cdot
>         10^{-19}~\mathrm{s} % \nonumber
>       \end{split}
> \end{displaymath}
> 
> This works perfectly in pdflatex, but when running htlatex, I get the
> following error message:
> 

It would be better to show a complete self contained example, not math fragment.
And the complete commands you used to compile. This way no one have to guess.

It is also better to use make4ht not htlatex. make4ht is now
the standard way to compile latex to HTML.


> =======
> 
> ! Package amsmath Error: \begin{split} won't work here.
> 
> See the amsmath package documentation for explanation.
> Type  H <return>  for immediate help.
>    ...
> 
> l.79       \end{split}
> 
> ?
> ! Emergency stop.
>    ...
> 
> l.79       \end{split}
> 
> ============
> 
> Can someone please help me in figuring out what's wrong and how to avoid
> that?
> 
> 2. I am using exerquiz package of AcroTeX education bundle
> (https://ctan.org/pkg/acrotex) which easily allows to typeset individual
> exercises and display/hide solutions. Unfortunately, it does not seem to
> work with tex4ht, when running htlatex, there is a conflict with one of
> the include file (epdfmark.def, part of this CTAN package)
> 
> ====================
> 
> ) (/usr/share/texlive/texmf-dist/tex/latex/hyperref/htex4ht.def)
> (./insdljs.sty
> ) (./eforms.sty (./epdfmark.def))
> 
> exerquiz: * Using dvipsone/dvips option *
> 
> 
> ! LaTeX Error: Command \theHquizno undefined.
> 
> See the LaTeX manual or LaTeX Companion for explanation.
> Type  H <return>  for immediate help.
>    ...
> 
> l.297 \renewcommand\theHquizno
> {\curr at quiz.\theeqquestionnoi.\alph{quizno}}
> ?
> ! Emergency stop.
>    ...
> 
> l.297 \renewcommand\theHquizno
> {\curr at quiz.\theeqquestionnoi.\alph{quizno}}
> ==========
> 
> 
> I understand that processing some environments that are not part of
> standard TeXLive distribution might be problematic. Nevertheless, is
> there a way to tell htlatex to e.g. to deal with them as images? Or any
> other way?
> 
> 
> Thanks a lot for any hint
> 
> best regards,
> 
> Tomas
>