Or rather in a LaTeX block in the `header-includes` list in the YAML
metadata:

---
header-includes:
  - |
    ```{=latex}
    % LaTeX code here!
    ```
---


--
Better --help|less than helpless

Den lör 9 maj 2020 21:44John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:

>
> Try putting it in
>
> header-includes
>
> in your YAML metadata.
>
> Germano Gabbianelli <tyrion.mx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > Hello, I have the following markdown source, containing some latex
> macros
> > and I would like to convert it both to html and pdf.
> >
> >
> > ---
> > title: Hello
> > ---
> >
> > \DeclareMathOperator*{\E}{\mathbb E}
> >
> > This is some math: $\E x$
> >
> >
> > I can convert it to html, using `pandoc hello.md  --mathml -s -o
> out.html`,
> > but conversion to pdf fails (complaining that \DeclareMathOperator can
> only
> > be used in the preamble):
> >
> > $ pandoc hello.md  -f markdown-latex_macros -s -o out.pdf
> > Error producing PDF.
> > ! LaTeX Error: Can be used only in preamble.
> >
> >
> > I can successfully convert the markdown to pdf, by moving the macros to
> a
> > separate `macros.tex` file and including it with `-H`, however I would
> like
> > to keep a single input markdown file, which should be converted to both
> > html and pdf.
> > Having the macros in a separate file would be ideal, so I could avoid
> > duplicating them in each source file.
> >
> >
> > I also tried to make a lua filter to dynamically include `macros.tex`
> when
> > converting to html, but it does not seem to work.
> >
> >
> > mt, contents = pandoc.mediabag.fetch("etc/macros.tex", ".")
> > macros = pandoc.read(contents).blocks
> >
> > function Pandoc(doc)
> >     return pandoc.Pandoc(macros .. doc.blocks, doc.meta)
> > end
> >
> >
> > Could anyone give me any hints?
> >
> > Thank you,
> > Germano
> >
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