Re: latex macros expansion as a Lua filter?

[John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Well, you could use the Lua ‘read’ function to read in a snippet consisting of the macro definitions + the math.
e.g.

pandoc -f latex -t native
\newcommand{\pie}{\pi}
$\pie^2$
^D
[ Para [ Math InlineMath "\\pi^2" ] ]

> On Jan 17, 2023, at 11:17 AM, bapt a <auguieba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> Hi,
> 
> I've found it useful in some situations to expand all custom LaTeX macros (such as `\newcommand{\Curl}{\nabla\times}`, for example) in a document before rendering it. 
> For example, with Quarto being used to produce a book in both pdf and html formats, the macros stored in a file `_macros.tex` are processed differently in the LaTeX path (simply including `_macros.tex` in the preamble) and in the Html version (where Mathjax needs to be given such macros for every page that it renders; it doesn't work to provide it once for the whole book/website). 
> 
> An alternative that sounds quite robust would be to run something like de-macro (https://www.ctan.org/tex-archive/support/de-macro) on the source document before it is rendered: the macros are still used for convenience of writing in the input file, but they get expanded explicitly before LaTeX or Mathjax is asked to render.
> 
> Unfortunately, de-macro is a Python script, and might be a little fragile as it processes whole documents with regex. I wonder if achieving the same thing would be easier with a Lua filter in pandoc? Presumably, having already all the equations isolated in the AST makes life a bit easier, and I believe there is already a mechanism in pandoc to process and expand `\newcommand` directives for non-latex output. Is this mechanism available to a Lua filter that could be used in a Quarto workflow?
> 
> Many thanks,
> 
> baptiste
> 
> 
> 
> 
> 
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