Lawrence Bottorff <borg...@gmail.com> writes:
> ... I use
>
> # this makes MathJax work
> #+OPTIONS: tex:t
>
> I just now found this caption weirdness because I started a new .org
> file with no latex symbol markup besides in the caption. Quite
> bizarre that when my file sees other latex symbols, the caption
> symbols then render correctly.
>
> On Wed, Sep 13, 2017 at 6:55 PM, Nick Dokos <ndo...@gmail.com> wrote:
>
> Nicolas Goaziou <m...@nicolasgoaziou.fr> writes:
>
> > Hello,
> >
> > Lawrence Bottorff <borg...@gmail.com> writes:
> >
> >> Consider this markup:
> >>
> >> ------------
> >> * MATHEMATICS AUXILIARY
> >>
> >> ** deriving sines and cosines
> >>
> >> #+caption: Right triangle with two $\pi\big/4$ angles.
> >> [[file:images/45-45-triangle.png]]
> >>
> >> $\big/$
> >> ------------
> >>
> >> If I remove the second $\big/$, the first latex, $\pi\big/4$, in the
> >> caption will not properly render on export to html. Include it and both
> >> render just fine. Without the second, the first looks like this:
> >>
> >> Figure 1: Right triangle with two \(\pi\big/4\) angles.
> >>
> >> Is this a bug?
> >
> > If you use
> >
> > #+options: tex:dvipng
> >
> > the symbol in the caption is correctly rendered. It may be a bug in
> Mathjax.
> >
>
> I looked at the diff between html files produced with and without the
> $\big/$ addition.
> The one without does not include any of the mathjax configuration code at
> all. Is that
> code included conditionally perhaps when a latex construct is seen? Maybe
> the latex construct
> in the caption does not trigger the inclusion?
>
> --
> Nick
>
org-html--build-mathjax-config includes the mathjax code only if
(and (memq (plist-get info :with-latex) '(mathjax t))
(org-element-map (plist-get info :parse-tree)
'(latex-fragment latex-environment) 'identity info t))
is true. So if there is latex markup in the file (other than the caption) the
org-element-map
call finds it and returns non-nil, but it apparently does not look inside the
caption.
--
Nick
