Thanks Bastien, 

Just to clarify: by "LaTeX always places on top of the page full-width 
figures in a multicolumn environment" you mean that the figure is floated 
and placed on top of a page, right? (as in the sample tex you give). Using 
neither the filter (i.e. removing the \end{multicols} and 
\begin{multicols}{2} that surround the figure) nor the \renenvironment 
crashes (floats not allowed in multicols). But otherwise I don't see any 
difference in output between (1) filter alone, (2) filter + 
renewenvironnment, (3) renewenvironment alone, except that the float may 
end up in a different page depending on details. I can see that using the 
renewenvironment alone may be simpler for Loïc's purposes than loading the 
filter and wrapping the whole doc in ::: columns div. But perhaps a more 
general solution would be:

- to have a filter that handles float placement in LaTeX (per doc, per 
figure basis). 
- to make sure the columns filter handles column markup when the doc is in 
two-columns mode, without the need for a wrapping div.
- possibly, to add float placement options in the columns filter?

I'll post the last two issues on the columns repo. 

All best,

Julien

On Friday, March 26, 2021 at 2:49:48 PM UTC Bastien Dumont wrote:

> Hi,
>
> Thank you for sharing your filter, which is really great. I noticed one 
> problem though: LaTeX always places on top of the page full-width figures 
> in a multicolumn environment. It means that the stream will be broken after 
> the figure, as this document will show:
>
> \documentclass{article}
> \usepackage{multicol}
> \usepackage{lipsum}
>
> \begin{document}
>
> \begin{multicols}{2}
> \lipsum[1-7]
> \end{multicols}
>
> \begin{figure}
> \begin{quote}
> \lipsum[8]
> \end{quote}
> \end{figure}
>
> \begin{multicols}{2}
> \lipsum[1-7]
> \end{multicols}
>
> \end{document}
>
> If you only want to make all figures span the entire width in a two-column 
> layout, you can simply add this in the metadata block of your document 
> (without changing anything in the command-line):
>
> header-includes: |
> \renewenvironment{figure}{\begin{figure*}}{\end{figure*}}
>
> However, the limitation regarding the figures' placement will still apply.
>
> Hoping that it helps,
>
> Bastien
>
> Le Friday 26 March 2021 à 06:34:51AM, Julien Dutant a écrit :
> > Hi,
> > 
> > The columns filter might help: https://github.com/jdutant/columns . It 
> will
> > typeset as full width anything wrap within a ::: columns-span DIV. It 
> doesn't
> > have an option to automatically do that for every figure / table, though 
> you
> > could write a small lua filter to add that. Notes:
> > 
> > - the column-span DIVs will only be processed if they are in a ::: 
> columns DIV.
> > Solution: put the entire document in such a DIV (or ::: {.two-columns}, 
> to be
> > on the safe side)
> > - the filter will add "\usepackage{multicols}" to your header.
> > 
> > A small Lua filter to put tables in fulll width would like:
> > 
> > ```lua
> > function Table (elem)
> > return pandoc.Div( elem, {class = 'column-span' } )
> > end
> > ```
> > 
> > Best,
> > J
> > 
> > On Friday, March 26, 2021 at 12:33:15 PM UTC houpe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> > 
> > Hi all,
> > I didn't find a way to easily display my figure in full width in a
> > two-column layout document.
> > 
> > I have a markdown document that I convert to pdf with the command below:
> > 
> > pandoc article.md \
> > --citeproc \
> > --from=markdown+tex_math_single_backslash+tex_math_dollars+raw_tex \
> > --to=latex \
> > --output=build/article-print-doublecols.pdf \
> > --pdf-engine=xelatex \
> > --include-in-header="layout/supertabular.tex" \
> > --filter="layout/twocolumns_table_fix.py" \
> > -M classoption=twocolumn
> > -M geometry="left=3cm,right=3cm,top=2cm,bottom=2cm"
> > 
> > 
> > Is there an "easy" way to do that so the figures in my pdf will be full
> > width while all the rest of the document stay in a twocolumns layout ?
> > (e,g. by adding a specific argument to this command ?)
> > 
> > I didn't find an easy solution to this problem....
> > 
> > Thank you,
> > 
> > Loïc
> > 
> > 
> > 
> > 
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