Re: Markdown Fenced Div to LaTeX Environment

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

Pandoc's latex reader doesn't know about the algorithm
environment. What package defines it?

With the latest pandoc release, we get this output with
pandoc -f latex -t html --mathjax on your input:

<div class="algorithm">
<p><span class="math inline">\(x &gt; 0\)</span>. <span class="math inline">\(x \gets x^2\)</span> <span class="math inline">\(x\)</span></p>
</div>

Better, though we lose the line breaks and we lose \Require, etc.

If you want to handle this properly, one option would be to use
pandoc -f latex+raw_tex --lua-filter handle_algorithm.lua

You'd have to write handle_algorithm.lua, but what it would do
is find raw latex blocks with algorithm environments and convert
them to some form that works in your Jekyll blog.

You might also try this approach:

Add macro definitions to your latex:

\renewcommand{\Require}{1]{Require #1}

and so on for \State and \Procedure.

Then pandoc will parse them and you'll get better output. That
gets you almost all the way there, except for the newlines and
whitespace, if they're significant in this environment.

For the newlines, you could add a filter that intercepts
SoftBreak.



Bernie Roesler <bernard.roesler-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Hi all,
>
> Is there a *reverse* of this solution? I'm trying to go from LaTeX to 
> markdown/html for posting to a Jekyll blog, but pandoc parses out much of 
> the algorithm/algorithmic environments, and does not put the contents in a 
> div like it does for theorems/proofs.
>
> With the input:
>
> \begin{algorithm}
>     \Require $x > 0$.
>     \Procedure{SquareX}{$x$}
>       \State $x \gets x^2$
>       \State \Return $x$
>     \EndProcedure
> \end{algorithm}
>
> Currently the output is:
>
> $x > 0$. $x \gets x^2$ $x$
>
> I'd like to have to something like:
>
> <div class="algorithm">
>     <span class="Require">$x > 0$</span>
>     <span class="Procedure">SquareX</span>($x$)
>     <span class="State">$x \gets x^2$</span>
>     <span class="State" class="Return">$x$</span>
>     <span class="EndProcedure"></span>
> </div>
>
> or something to that effect to allow formatting of the individual elements.
>
> See also my StackOverflow question 
> <https://stackoverflow.com/questions/65930404/pandoc-latex-to-markdown-do-not-parse-environment>
>  and Jekyll Talk discussion 
> <https://talk.jekyllrb.com/t/kramdown-latex-usepackage-algorithm-pseudocode/2861/7?u=broesler>
> .
>
> I can do my own wrangling and add a verbatim environment before running it 
> through pandoc and then parse that chunk of the markdown file afterwards, 
> but I was curious if there was a more elegant solution to dealing with 
> unknown environments.
>
> Thanks,
> Bernie
>
> On Sunday, January 24, 2021 at 2:51:02 PM UTC-5 chris....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
>> Thanks! Exactly what i needed to know. 
>>
>> -Chris
>>
>> On Sun, Jan 24, 2021, 11:58 AM John MacFarlane <j...-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:
>>
>>>
>>> You need a filter, but it would be a simple one.
>>>
>>> Something like
>>>
>>> function latex(s)
>>>   return pandoc.RawBlock('latex', s) 
>>> end
>>>
>>> function Div(el)
>>>   if el.classes[1] == 'solution' then
>>>     return { latex('\begin{solution}'), el.content, 
>>> latex('\end{solution}') }
>>>   end
>>> end
>>>
>>> Chris Diaz <chris....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>>
>>> > Hello,
>>> >
>>> > I'm looking for advice on how to produce HTML and LaTeX from Markdown 
>>> using 
>>> > fenced divs (or something else) to apply custom styles to specific 
>>> portions 
>>> > of the document. 
>>> >
>>> > For example, I'm hoping to write something like this:
>>> >
>>> > ::: solution
>>> > Solution text here.
>>> > :::
>>> >
>>> > in order to produce this when HTML is the output (already works):
>>> >
>>> > <div class="solution">
>>> > Solution text here.
>>> > </div>
>>> >
>>> > and this when LaTeX/PDF is the output:
>>> >
>>> > \begin{solution}
>>> > Solution text here.
>>> > \end{solution}
>>> >
>>> > This idea comes from Bookdown's 
>>> > <https://bookdown.org/yihui/bookdown/custom-blocks.html> Custom Blocks 
>>> > feature, but I'm wondering if there's a way to do this with Pandoc, or 
>>> if 
>>> > this would require a Lua filter. 
>>> >
>>> > Thanks,
>>> > Chris
>>> >
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>>> .
>>>
>>
>
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