Re: Pandoc #4317 side effect

[Thomas Chevrier <tchevri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Thank you again John for taking the time again and again to respond - 
totally appreciated, it's amazing.

As a consequence, I took the entire day to try your solution, google 
frantically, but I failed miserably.
I will spare you the details of everything I tried, but here is what i 
think is my best attempt:

.1.  
Read carefully: https://bookdown.org/yihui/rmarkdown/template-pandoc.html

.2. 
Download default.latex from your website: 
https://github.com/jgm/pandoc-templates

.3. 
Rename the file to my-template.tex and, as per your email, line 460 just 
before $body$, add:
$if(dayone)$
\mode<presentation>
   {
     \title[\CourseName{} Lecture $lecture-number$]{\CourseName{} \newline 
\, Lecture $lecture-number$}
     \date{\DayOne{}\Yr{}}
   }
   ###
   \titlepage
$endif$

.4. 
In my bookdown,  add the $dayone$ custom Pandoc variable
# Notations {#notations}
## Mathematics
$dayone$
```{r Lecture1Outline, eval = (out_type=="beamer"), echo=FALSE, 
results='asis'}
```
```{r Lecture1Slide1, eval = (out_type=="beamer"), echo=FALSE, 
results='asis'}
```
`r if (out_type=="beamer") "- "` $h = \left(h_{1}, h_{2}, \ldots, 
h_{n}\right)$ denotes a vector (lowercase)

etc. etc...

.5.
add "template: my-template.tex" to my YAML so that "--template 
my-template.tex" is being correctly added as an option to Pandoc.

OUTCOME:

I still get the undesired slide...
"...
Mathematics
𝑑𝑎𝑦𝑜𝑛𝑒
..."

I check the .rmd file.
It has 
<!--chapter:end:index.Rmd-->
# Notations {#notations}
## Mathematics
$dayone$
etc. etc...

the .tex file has:

\hypertarget{mathematics}{%
\subsection{Mathematics}\label{mathematics}}
\begin{frame}{Mathematics}
\(dayone\)
\end{frame}

I am so sorry - I feel crummy I could not figure this one out after so many 
hours and I Thank you in advance for any further help on this issue that 
has drawn me for nearly 18 months.
Many thanks
thomas

PS: note that I have 
before_body: beamer_prefix.tex
and that works well for setting the initial cover page (syllabus) - the 
issue is really after, as I used this mode<presentation> to redefine the 
elements of the title slide on the fly (day 1, 2, etc of the course)

On Tuesday, August 25, 2020 at 12:22:26 PM UTC+8 John MacFarlane wrote:

>
> If that's what you need, then a custom template could provide it.
> Just add this stuff to a custom template, with variables in the
> varying parts:
>
> \mode<presentation>
> {
> \title[\CourseName{} Lecture $lecture-number$]{\CourseName{} \newline \, 
> Lecture $lecture-number$}
> \date{\DayOne{}\Yr{}}
> }
> ###
> \titlepage
>
> $body$
>
> "Chevrier, Thomas" <t...-ACPurvaskuAAcGGWjIcM5Q@public.gmane.org> writes:
>
> > First of all, thank you so much for taking the time to reply - really 
> much
> > appreciated, all the more given how busy I see you are, with so many
> > awesome improvements.
> > I love this "raw beamer" attribute, might make my document a lot more
> > readable, yet to try it for other purposes.
> > Unfortunately, this suggested solution does not help the issue at stake.
> >
> > The issue is for the content not to get forced slapped onto a slide.
> > To create a new title page, I need the following piece of code:
> > \mode<presentation>
> > {
> > \title[\CourseName{} Lecture 1]{\CourseName{} \newline \, Lecture 1}
> > \date{\DayOne{}\Yr{}}
> > }
> > ###
> > \titlepage
> >
> > And this {...} code cannot sit inside a frame or a latex error is thrown 
> (!
> > Illegal parameter number in definition of \iterate.).
> > After 2.7 - there is no more option for me to write content outside a 
> frame
> > - everything is forced into a frame.
> > "raw beamer" attribute does not escape this behavior unfortunately.
> >
> > Hence my suggestion last night - i don't know if that would be acceptable
> > or even useful?
> > But i have been thinking that I am perfectly fine with level -2 content 
> not
> > being forced onto slides.
> > From what I read, it looks like reveal.js users only need level -1 
> content
> > slapped onto slides?
> > Of course, I'd be happy with any other solution you think is best.
> >
> > Many thank
> > thomas
> >
> >
> > On Tue, Aug 25, 2020 at 4:00 AM John MacFarlane <j...-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> 
> wrote:
> >
> >>
> >> If you use the raw attribute to mark up content as "raw beamer,"
> >> as suggested earlier in this thread, it will not appear in
> >> reveal.js output. Demo here:
> >>
> >>
> >> 
> https://pandoc.org/try/?text=%23+Introduction%0A%0A%60%60%60%7B%3Dbeamer%7D%0AHey+this+is+raw+beamer!%0A%60%60%60%0A%0A%23%23+Slide+one%0A%0Acontent%0A%0A%23%23%23+Vertical+slide%0A%0Acontent+vertical%0A&from=markdown&to=revealjs&standalone=0
> >>
> >>
> >> Thomas Chevrier <tch...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
> >>
> >> > Hi folks,
> >> >
> >> > it's been exactly a year now and I am still not able to upgrade my
> >> version
> >> > of Pandoc - stuck pre 2.7, because of the adverse change.
> >> > Indeed, the "upgrade" for reveal.js users caused my latex beamer code 
> to
> >> > break down.
> >> > I have tried multiple things without luck - I also tried a lua filter,
> >> but
> >> > that did not work - no matter what, the content gets "slapped" onto a
> >> slide.
> >> > As JGM suggests (was great watching him talk about Pandoc at TUG 2020
> >> > keynote address), I'd love to be able to simply be able to have 
> content
> >> > escape being slapped onto a slide - I believe that's precisely the
> >> spirit
> >> > of Beamer, which uses <mode> heavily for that purpose.
> >> > I also thought that was the spirit of pandoc - as you were setting in
> >> the
> >> > yaml header your level for displaying on slides, but i have been 
> clearly
> >> > proven wrong. :-(
> >> > One option would be to recompile pandoc without that change, but 
> because
> >> of
> >> > the bloomberg API, I am forced to be on windows, which would make this
> >> > solution cumbersome at best (would be straightforward on linux 
> though).
> >> >
> >> > FYI, I posted back then on SO, got only 2 upvotes and 2 bookmarks, but
> >> no
> >> > answer, not even a comment :-(
> >> >
> >> 
> https://stackoverflow.com/questions/57614387/pandoc-4317-forces-content-under-title-slides-to-be-included-in-a-frame-in-pand
> >> >
> >> >
> >> > Could anyone *please* help me?
> >> > many thanks in advance
> >> > thomas
> >> >
> >> >
> >> > On Wednesday, August 28, 2019 at 12:23:15 AM UTC+8 John MacFarlane 
> wrote:
> >> >
> >> >>
> >> >> To summarize the issue here, which concerns a change to slide
> >> >> show formats:
> >> >>
> >> >> Prior to 2.7, versions of pandoc only put material under the "slide
> >> >> level" headings on slides. If you set slide level to 2, then
> >> >> only material under level-2 headings would appear on slides,
> >> >> and text under level-1 headings would not appear at all
> >> >> (though level-1 headings would create "title slides" with
> >> >> just the section title).
> >> >>
> >> >> Reveal.js users consistently complained (#4317, #5237) that
> >> >> this made it hard to structure reveal.js 2D slide shows, in
> >> >> which it is common to have the "top" slide on each column
> >> >> contain both a title and some text.
> >> >>
> >> >> In response, I changed pandoc in 2.7 -- as the changelog says,
> >> >>
> >> >> > Slide show formats behavior change: content under headers less
> >> >> > than slide level is no longer ignored, but included in the title
> >> >> > slide (for HTML slide shows) or in a slide after the title slide
> >> >> > (for beamer). This change makes possible 2D reveal.js slideshows
> >> >> > with content in the top slide on each stack (#4317, #5237).
> >> >>
> >> >> The change to reveal.js has been welcomed by reveal.js users,
> >> >> but the change to beamer is apparently not welcome by everyone.
> >> >> The reason I made the change to both formats is because I want
> >> >> slide shows to work the same no matter what output format you
> >> >> use. (So you can switch from beamer to reveal.js, for example,
> >> >> and the slides will look more or less the same.)
> >> >>
> >> >> I had thought the beamer change was innocuous, since it could
> >> >> be worked around by people who wanted to include content under
> >> >> top-level section headings but not in the slides, e.g. by using
> >> >> a filter to strip out this content.
> >> >>
> >> >> Unfortunately, Thomas Chevrier's use case can't be handled that
> >> >> way. He wants to insert raw tex commands that (a) can't be
> >> >> stripped out but (b) only work if they're outside the
> >> >> 'frame' environment created for a slide. I can't think of any
> >> >> workaround for this.
> >> >>
> >> >> One possible course of action would be to revert the beamer
> >> >> change while keeping the reveal.js change. This would potentially
> >> >> have two bad consequences:
> >> >>
> >> >> 1) slide shows would render differently (in content, not just
> >> >> form) in reveal.js and beamer.
> >> >>
> >> >> 2) this may break slide shows that were constructed using the
> >> >> new behavior since 2.7 was released.
> >> >>
> >> >> A less radical change might be to introduce special Div whose
> >> >> contents get moved outside the slide itself. Anyway, comments
> >> >> welcome.
> >> >>
> >> >>
> >> >>
> >> >
> >> > --
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> >> 
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> >> .
> >>
>

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