Le mercredi 28 novembre 2018 à 00:40 +0100, Nicolas Goaziou a écrit :

> emanuel.charpentier@gmail.com writes:
>

> > Le mardi 27 novembre 2018 à 21:26 +0100, Nicolas Goaziou a écrit :
> >
> > [ Snip... ]
> >

> > > What happens if you remove "org-ref.el" reference?

> >
> > Same thing.
> >
> > Even after uninstalling org-ref and its dependencies.
> >
> > Sorry...

>
> OK. I got it. This has nothing to do with LANGUAGE keyword.
>
> Babel is not a default package, per `org-latex-default-packages-
> alist.
> You need to add it to `org-latex-packages-alist'.


Close, but no cigar :

I used the `customize' interface to add it to `org-latex-default-
packages-alist' (because the package to load is compiler-dependent),
which becomes:

(("AUTO" "inputenc" t
  ("pdflatex"))
 ("T1" "fontenc" t
  ("pdflatex"))
 (#1="" "graphicx" t nil)
 (#1# "grffile" t nil)
 (#1# "longtable" nil nil)
 (#1# "wrapfig" nil nil)
 (#1# "rotating" nil nil)
 ("normalem" "ulem" t nil)
 (#1# "amsmath" t nil)
 (#1# "textcomp" t nil)
 (#1# "amssymb" t nil)
 (#1# "capt-of" nil nil)
 (#1# "hyperref" nil nil)
 (#1# "babel" t
      ("pdflatex"))
 (#1# "polyglossia" t
      ("xelatex" "lualatex")))

I then retried an example (similar to the first one, but another
machine...) (see enclosed files).

  * The latex file does indeed contain "\usepackage{babel}" at the end
    of preamble

  * But the language is never set.

  * Therefore, no "frenchizing" happens...

This is due to the fact that, in order to get what I mean, the babel
loading should be "\usepackage[frenchb]{babel}", i. e. take the value
corresponding to whatever #+language: implies ("frenchb" for "fr",
etc...). I do not know how to do that.

Is there a documented way to do that, or should I dive in ox-latex
source ?

A couple of remarks :
  * If this setup is necessary to get #+langiage: honored fot LaTeX
    export, this should be done by default (i. e. in org's source
    code).

  * One might wish to allow to fully use babel's (and polyglossia's)
    abilities by specifying a set of possible #+language:s (first
    call) or switch to another language (further calls down the
    file...).

  * concerning french: I understand that "frenchb" is obsolete and
    that one should use "french" instead (better compatibility with
    ispell and flyspell-babel, among others)...

  * I suggest a '(#1# "fontspec" t '(xelatex lualatex)), and possibly
    an '(#1# "mathspec" t '(xetex luatex)) or '(#1# "unicode-math" t
                                                '(xetex luatex))
    entry(ies) to be added to the default : xetex is more and more
    used, and luatex is officially the successor to pdftex...

HTH,

--
Emmanuel Charpentier


Le mer. 28 nov. 2018 à 00:40, Nicolas Goaziou <mail@nicolasgoaziou.fr> a
écrit :

> emanuel.charpentier@gmail.com writes:
>
> > Le mardi 27 novembre 2018 à 21:26 +0100, Nicolas Goaziou a écrit :
> >
> > [ Snip... ]
> >
> >> What happens if you remove "org-ref.el" reference?
> >
> > Same thing.
> >
> > Even after uninstalling org-ref and its dependencies.
> >
> > Sorry...
>
> OK. I got it. This has nothing to do with LANGUAGE keyword.
>
> Babel is not a default package, per `org-latex-default-packages-alist.
> You need to add it to `org-latex-packages-alist'.
>
>