is it possible to make setmainfont read environment variable to specify the font path in one place

Question

I am using this command in latex to specify the font path:

\setmainfont[Color=primary, Path = fonts/source-han-serif/,BoldItalicFont=SourceHanSerifSC-Bold,BoldFont=SourceHanSerifSC-Bold,ItalicFont=SourceHanSerifSC-Bold]{SourceHanSerifSC-Regular}

now I have a issue that, I have many cls files that contains the font path, if I want to change the file path, I have to open each cls file and edit one by one. is it possible to make setmainfont to read the environment that I can specify the font path in one place? my possible operation system is Ubuntu and macOS.

Why don't you install the fonts in one of the default font paths? — cabohah, Jun 17 '23 at 12:29
If you don't know the paths searched for fonts, ask kpathsea, e.g. kpsewhich -progname=lualatex -show-path=.otf — cabohah, Jun 17 '23 at 12:33

score 1 · Accepted Answer · answered Jun 17 '23 at 16:40

Yes, you can use my code at https://tex.stackexchange.com/a/62032/4427

Here I use a variant of a previous answer to your question about HOME, just by way of example.

\documentclass{article}
\usepackage{fontspec}
\ExplSyntaxOn
\NewDocumentCommand{\getenv}{om}
 {
  \sys_get_shell:nnN { kpsewhich ~ --var-value ~ #2 } { } \l_tmpa_tl
  \tl_trim_spaces:N \l_tmpa_tl
  \IfNoValueTF { #1 }
   {
    \tl_use:N \l_tmpa_tl
   }
   {
    \tl_set_eq:NN #1 \l_tmpa_tl
   }
 }
\ExplSyntaxOff
\getenv[\HOME]{HOME}
\getenv[\TEST]{TEST}
\newfontface{\fell}{IMFePIit29C}[
  Path=\HOME/provaccia/conf-1.7b/fell/,
  Extension=.otf,
]
\begin{document}
\texttt{TEST is \TEST}
\texttt{TEST is \getenv{TEST}}
{\fell Hello}
\end{document}

I run this on bash as

TEST=foo xelatex dolphin

and the output is

Of course you're responsible for correctly defining and exporting the environment variable you need on each system.

is it possible to make setmainfont read environment variable to specify the font path in one place

1 Answers1