Hi Juan,

On Thu, Sep 21, 2023 at 5:33 PM Juan Manuel Macías <maciaschain@posteo.net>
wrote:

> Hi, Zenny,
>
> Zenny writes:
>
> > Where does this preamble goes to? Any example?
>
> As in your example, using latex_header keywords (replacing the
> polyglossia code with the babel code):
>
> #+LaTeX_Header: \usepackage[english]{babel}
> #+LaTeX_Header: \usepackage{fontspec}
> #+LaTeX_Header: \newfontscript{Devanagari}{deva}
> #+LaTeX_Header: \babelprovide[onchar=ids fonts]{sanskrit-devanagari}
> #+LaTeX_Header: \babelfont[sanskrit-devanagari]{rm}{Noto Sans Devanagari}
>
> > Yet I am a bit confused because the Sanskrit/Devanagari words are used
> > not in a whole block, but in between English sentences, eg.:
>
> With Polyglossia and babel it is necessary to enter a command that
> changes the language. In the case of polyglossia, if you don't
> explicitly switch to Sanskrit the font you declared for Sanskrit is not
> used, and LaTeX still thinks the text is English. Polyglossia uses some
> commands similar to those of babel (\selectlanguage, for long texts) and
> other native ones, such as \text<lang>{text}, where <lang> is the
> secondary language. In babel you have the command
> \foreignlanguage{<lang>}{text}. For example (using polyglossia):
>
> Old expression goes like \textsanskrit{स्वस्ति सत्यं वचति}
>
> Of course, in org you would have to use some trick, like defining some
> macro (since org does not have, at the moment[1], a native language
> switching method):
>
> #+macro: sanskrit @@latex:\textsanskrit{@@$1@@latex:}@@
>
> Old expression goes like {{{sanskrit(स्वस्ति सत्यं वचति)}}}
>
> With LuaLaTeX, babel can associate a non latin language to a font
> without requiring an explicit language switch:
>
> #+LaTeX_Header: \usepackage[english]{babel}
> #+LaTeX_Header: \usepackage{fontspec}
> #+LaTeX_Header: \newfontscript{Devanagari}{deva}
> #+LaTeX_Header: \babelprovide[onchar=ids fonts]{sanskrit-devanagari}
> #+LaTeX_Header: \babelfont[sanskrit-devanagari]{rm}{Noto Sans Devanagari}
>

With above code for LuaLaTeX, I have also appended:

#+LATEX_COMPILER: lualatex

even after specifying the LaTeX compiler to lualatex a report that says,
the compiler seems to use pdflatex:

! Fatal Package fontspec Error: The fontspec package requires either XeTeX
> or
> (fontspec)                      LuaTeX.
> (fontspec)
> (fontspec)                      You must change your typesetting engine to,
> (fontspec)                      e.g., "xelatex" or "lualatex" instead of
> (fontspec)                      "latex" or "pdflatex".
>
> Type <return> to continue.
>  ...
>
> l.45 \msg_fatal:nn {fontspec} {cannot-use-pdftex}
>

Entire texlive packages are installed and lualatex binary is at:

$ which lualatex
> /opt/texlive/2023/bin/x86_64-linux/lualatex
>

Thanks for your attention!
/z


> Old expression goes like स्वस्ति सत्यं वचति
>
> [1] You might be interested in this thread:
> https://list.orgmode.org/878r9t7x7y.fsf@posteo.net/
>


-- 
Cheers,
/z

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