Org html export does not recognize custom latex macros

Question

I have a org mode file which has some custom macros like

#+LATEX_HEADER: \newcommand{\opt}[1]{{#1}^{*}}

Sometimes I need to export the same document to html, where this appears as

undefined control sequence \opt

How should I define the same macro so that html exports can see them too?

Answer 1

There is incomplete solution:

#+LATEX_HEADER: \newcommand{\opt}[1]{{#1}^{*}}
#+BEGIN_HTML
\(
\newcommand{\opt}[1]{{#1}^{*}}
\)
#+END_HTML

\opt{2} - works for 'latex backend

\( \opt{2} \) - works for 'html backend

It needs a way to combine them. You have to escape macros with \( depending on backend, for example like in answer https://stackoverflow.com/a/12719168/1937596, but from that time org-mode changed API

Answer 2

If applicable to you, you could try using Org macros in such a way:

#+MACRO: opt @@latex:\opt{$1}@@@@html:$1@@

That is {{{opt(...)}}} gets converted to:

• \opt{...} in LaTeX
• ... only in HTML