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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