Pandoc doesn't preserve any info about the number of blank lines in the
input, i.e. two newlines, three newlines or more are equivalent and just
register as a paragraph/other block break.

I suppose you know that you simply can type `\medskip` in a paragraph on
its own? It will be passed through unchanged to LaTeX output and ignored in
other ourput formats. If you want similar behavior in HTML output you can
have a filter intercept RawBlock elements with format `latex` and text
`\medakip` and insert e.g. a span with suitable CSS styling. I do something
similar with `\newpage` even in DOCX output.

If you don't like the raw LaTeX but don't otherwise use horizontal rules
you could put a horizontal rule where you want a medskip and use a filter
to replace HorizontalRule elements with latex RawBlock elements with
content `\medakip` for LaTeX output, or to remove them in HTML output.

tis 13 nov. 2018 kl. 22:20 skrev Jeremy Theler <jeremy-24em0bpozeFWk0Htik3J/w@public.gmane.org>:

> Hello all
>
> Is there anyone out there who can tell me how to write a Lua filter such
> that if two markdown paragraphs are separated by two (three) blank lines in
> the input then a LaTeX \medskip (\bigskip) command is inserted into the
> output?
>
> Thanks
> --
> jeremy theler
> www.seamplex.com
>
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