Inconsistency between Xenops external command input and latex engine

[deshearth]

In tex file generated by Xenops (located at /var/folder/... and it can be found by click copy failing command), it uses a package called "fontspec". But the compiling engine is latex. So if I run failing command in terminal, the error is that lualatex or xelatex is required to use the package. I wonder how this tex file is generated and is there any way to customize the preamble. I know that variable org-format-latex-header can be set. But in the tex file generated by Xenops, there are a few other packages, such as "fontspec".

[mglnsk]

There exists a possible workaround -- using similar approach to configuring the default org-latex-preview for lualatex (relevant stackoverflow answer). As xenops exposes similar variables, it is possible to set:

(setq luasvgmpreview '(luasvgm :programs ("lualatex" "dvisvgm")
                :description "dvi > svg"
                :message "you need to install lualatex and dvisvgm."
                :image-input-type "dvi"
                :image-output-type "svg"
                :image-size-adjust (2.0 . 2.0)
                :latex-compiler
                ("lualatex --interaction=nonstopmode --shell-escape --output-format=dvi --output-directory=%o %f")
                :image-converter
                ("dvisvgm %f -n -b min -c %S -o %O")))
(add-to-list 'xenops-math-latex-process-alist luasvgmpreview)
(setq xenops-math-latex-process 'luasvgm)

This makes xenops use the lualatex compiler to generate previews.

[dandavison]

Hello, sorry about the very minimal level of support I provide for xenops!

I use lualatex personally when I use xenops. Here's the commit I use for this: ff0afa4

As you can see I literally just replace the :latex-compiler in xenops-math-latex-process-alist.