Re: Inconsistent use of \ref and \eqref in ox-latex and ox-html

[Nicolas Goaziou <mail@nicolasgoaziou.fr>]

Hello,

Brian Powell <powellb@hawaii.edu> writes:

> The issue is that when exporting equation numbers with ox-html, it uses MathJax's \eqref that wraps the equation in parentheses, for example:
>
> "Refer to (3) for more."
>
> However, when exporting the same document with ox-latex, it uses Latex's \ref that does not wrap the equation in parentheses. Would it be possible to add an option or variable to ox-html for the user to select whether to use \ref or \eqref on export? 
>
> For those of us that publish to HTML and PDF, it is very difficult because you end up with either double or no parentheses.
>
> My proposed fix would be a change to ox-html from:
>
>                (format "\\eqref{%s}"
>                        (org-export-get-reference destination info))
>
> to
>
>                (format (if org-html-export-mathjax-ref "\\ref{%s}" "\\eqref{%s}")
>                        (org-export-get-reference destination info))
>
> The variable org-html-export-mathjax-ref is non-nil to use \ref vs.
> nil to be the default \eqref.

The variable could be more general, e.g.,
org-html-export-equation-reference-format, and default to "\\ref{%s}".
Note the export back-ends do not use variables directly. It would be

  (format (plist-get info :html-equation-reference-format)
          (org-export-get-reference destination info))

where the correspondence between :html-equation-reference-format is set
in back-end definition.

Also, it needs to be referenced in "HTML specific properties" section of
the manual.

Would you want to propose a patch ?

Regards,

-- 
Nicolas Goaziou