Howto specify the width for columns in slides when using rST to beamer flow (instead of markdown)

Howto specify the width for columns in slides when using rST to beamer flow (instead of markdown)

[gokce.aydos-Re5JQEeQqe8AvxtiuMwx3w]

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Pandoc allows creation of columns for slides. The widths for the slides can 
be specified by using the 'width' attribute. See the example from the 
Pandoc user's guide [1]: 


:::::::::::::: {.columns}
::: {.column width="40%"}
contents...
:::
::: {.column width="60%"}
contents...
:::
::::::::::::::

is transformed to the following LaTeX output:

\begin{columns}[T]
\begin{column}{0.40\textwidth}
contents\ldots{}
\end{column}

\begin{column}{0.60\textwidth}
contents\ldots{}
\end{column}
\end{columns}

When using rST instead of Markdown, class directive [2] can be used to assign a block to a class: 

.. class:: columns

    .. class:: column

       contents...

    .. class:: column

       contents...

Unfortunately, there are no directive options available for the class directive. In practice, this means that it is not possible to assign the 'width' attribute to a class. The reason is probably that stylesheets are used for styling the classes, e.g., CSS in HTML.

Although Pandoc accepts CSS for HTML/CSS-to-pdf output, it does not support CSS input along with rST.

My workaround was to use directive options for the class directive even they are not allowed according to the rST spec. Fortunately, rST reader parses every directive option passed to a class [3]. The following block:
.. class:: columns

    .. class:: column
       :width: 40%

       contents...

    .. class:: column
       :width: 60%

       contents...

creates the same LaTeX output as above (with the exception of '...' instead of \ldots{} ).

Do you know a more standard way to format the columns when using rST to beamer flow?

Gökçe


[1] https://pandoc.org/MANUAL.html#columns
[2] http://docutils.sourceforge.net/docs/ref/rst/directives.html#class
[3] https://github.com/jgm/pandoc/blob/5d3573e780d5056c87bb64858ea0890a27bc1686/src/Text/Pandoc/Readers/RST.hs#L756



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