Re: Markdown Fenced Div to LaTeX Environment

[Bernie Roesler <bernard.roesler-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Edit: Reference for algorithm environments <https://tex.stackexchange.com/a/230789>.


> On Jan 28, 2021, at 14:24, Bernie Roesler <bernard.roesler-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> Ah, excellent. The additional div makes a big difference in processing.
> 
> I realized I over-simplified my example. It's actually:
> 
> \begin{algorithm}
> 	\caption{...}
> 	\label{alg:my_alg}
> 	\begin{algorithmic}
> 	...statements...
> 	\end{algorithmic}
> \end{algorithm}
> 
> "algorithm" is just a float like "figure" or "table", and "algorithmic" actually defines the commands "\Require", etc. pandoc now makes divs for both algorithm and algorithmic, but still loses the commands, as you've mentioned.
> 
> I've just been using a bash/sed script to pre-process the latex document before processing with pandoc which seems to work well for now.
> 
> Thanks for the update!
> 
> -Bernie
> 
> 
> ------------------
> for reference, I'm now using:
> ------------------
> $ pandoc --version
> pandoc 2.11.4
> Compiled with pandoc-types 1.22, texmath 0.12.1, skylighting 0.10.2,
> citeproc 0.3.0.5, ipynb 0.1.0.1
> User data directory: /Users/bernardroesler/.local/share/pandoc or /Users/bernardroesler/.pandoc
> Copyright (C) 2006-2021 John MacFarlane. Web:  https://pandoc.org <https://pandoc.org/>
> This is free software; see the source for copying conditions. There is no
> warranty, not even for merchantability or fitness for a particular purpose.
> 
> 
>> On Jan 28, 2021, at 12:10, John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org <mailto:jgm@berkeley.edu>> wrote:
>> 
>> 
>> 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 <mailto:bernard.roesler@gmail.com>> 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 <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 <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 <http://gmail.com/> 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 <http://berkeley.edu/>> 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 <http://gmail.com/>> 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 <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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