Hi,

I may have found a similar bug, but find it *very hard* to understand its 
exact causes.

In a rather long document, I have the following options in my YAML:

---
documentclass: scrbook
mainfont: texgyretermes
mainfontoptions:
- Path=fonts/
- Extension=.otf
- UprightFont=*-regular
- BoldFont=*-bold
- ItalicFont=*-italic
- BoldItalicFont=*-BoldItalic
fontsize: 12pt
---

Now, some combination of LaTeX packages (or something else?) that I load 
makes pandoc output, in the .tex document

\ifLuaTeX
\usepackage[bidi=basic]{babel}
\else
\usepackage[bidi=default]{babel}
\fi
\babelprovide[main,import]{english}
\ifPDFTeX
\else
\babelfont[english]{rm}{texgyretermes}
\fi

When I compile said document with XeLaTeX, I get

kpathsea: Running mktextfm TeXGyreTermes/OT


but that font is not found, and hence I get the error


Package fontspec Error: The font "TeXGyreTermes" cannot be found. 
\babel@aux{english}{}


If I replace 


\babelfont[english]{rm}{texgyretermes}


with


\babelfont[english]{rm}{fonts/texgyretermes-regular.otf}

then the document can be compiled.

Is this a bug?

I am using the latest version,
pandoc 3.0.1
Features: +server +lua
Scripting engine: Lua 5.4
User data directory: /home/caubert/.local/share/pandoc
Copyright (C) 2006-2023 John MacFarlane. Web:  https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.

Best,
And thanks,
Clément.
Le mardi 8 février 2022 à 16:35:00 UTC-5, John MacFarlane a écrit :

>
> Let us know what version of pandoc you're using.
> There have been extensive changes recently that might be
> relevant (we no longer use polyglossia, but of course
> it's possible that something relating to our old polyglossia
> support was left in the template...).
>
> "R (Chandra) Chandrasekhar" <chya...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > I am writing a bilingual test file for English and Tamil in the same 
> > markdown document to yield a PDF via lualatex and babel. The file, which 
> > correctly gives HTML and epub outputs, is:
> >
> > ```
> > ---
> > title: "Bilingual Test for LuaLaTeX and Babel: English and Tamil"
> > lang: en-GB
> > ---
> >
> > This is English.
> >
> > {\sffamily This is also English.}
> >
> > இது தமிழ்.
> >
> > {\sffamily இதுவும் தமிழ்.}
> >
> > :::{lang=ta}
> > இது கூட தமிழ் தான்.
> > :::
> >
> > Back to English and EOF.
> > ```
> >
> > The included `babel-in-header.tex` file is:
> >
> > ```
> > % babel-in-header.textsf
> > \babelfont{rm}[Scale=1.0,Language=Default,BoldFont={* SemiBold}]{Noto 
> Serif}
> > \babelfont{sf}[Language=Default,BoldFont={* SemiBold}]{Noto Sans}
> > \babelfont[tamil]{rm}[Language=Default]{Noto Serif Tamil}
> > \babelfont[tamil]{sf}[Language=Default]{Noto Sans Tamil}
> > \babelprovide[import,onchar=ids fonts]{tamil}
> > 
> \defaultfontfeatures{Scale=MatchLowercase,Ligatures=TeX,Renderer=HarfBuzz}
> > \thispagestyle{empty}
> > ```
> >
> > The compilation command is:
> >
> > pandoc --from markdown --to latex --include-in-header 
> > babel-in-header.tex --standalone --output en-ta-test.tex en-ta-test.md
> >
> > I find that the generated .tex file cannot be compiled to PDF because 
> > there appear to be two errors, which might be bugs:
> >
> > 1. The \babelfont commands appear _before_ the \usepackage{babel} 
> > invocation in the .tex file because of a commented requirement for 
> > polyglossia, which I am not using. As a result, I get an
> >
> > ```
> > ! Undefined control sequence.
> > l.59 \babelfont
> > {rm}[Scale=1.0,Language=Default,BoldFont={* 
> > SemiBold}]{Noto Serif}
> > ```
> >
> > error with lualatex.
> >
> > 2. If I manually transpose the \babelfont commands inserted by the 
> > `babel-in-header.tex` file to appear _after_ the babel invocation but 
> > before \title in the .tex file, I get this error:
> >
> > ```
> > ! Package babel Error: Unknown option 'tamil'. Either you misspelled it
> > (babel) or the language definition file tamil.ldf was not 
> > found.
> >
> >
> > See the babel package documentation for explanation.
> > ```
> >
> > 3. If I remove `tamil,` from the babel invocation,
> >
> > ```
> > \usepackage[tamil,main=british]{babel}
> > ```
> >
> > I am able to compile with lualatex, using the same command as before, 
> > and get the expected PDF, as shown in the attached screenshot.
> >
> > I realize that both pandoc and the babel package are under development, 
> > and are therefore moving targets.
> >
> > Nevertheless, I believe these are bugs in the markdown to latex 
> > conversion process and point them out so that they may be corrected or 
> > circumvented, automatically rather than manually, from the pandoc end.
> >
> > Thanks.
> >
> > Chandra
> >
> > -- 
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> .
>

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