pdflatex compiles, but log file "is not encoded in UTF-8"

[martinmodrak]

On Windows 10, even with latext tinytex + xfun I sometimes get a warning, that the log file could not be read (even though the PDF is created) This leads to minor annoyance in workflow as this seems to disrupt some downstream processes after latex. e.g. knitr will no longer open the built PDF.

The warning looks like:

Warning message: In xfun::read_utf8(log) :   
  The file my_tex_file.log is not encoded in UTF-8. These lines contain invalid UTF-8 characters: 321

I am not sure whether this is primarily an xfun issue (i.e. xfun should be able to handle the file) or an issue with tinytex (i.e. tinytex should be able to force the log file to be valid UTF-8).

Reproducible example:

tex_source <- r"(
\documentclass[
]{article}
\usepackage{amsmath,amssymb}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{textcomp} % provide euro and other symbols
\usepackage{lmodern}
\usepackage[left=4cm,right=4cm,top=2cm,bottom=2cm]{geometry}
\usepackage{longtable,booktabs,array}
\usepackage{graphicx}
\makeatletter
\def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\fi}
\def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\Gin@nat@height\fi}
\makeatother
\providecommand{\tightlist}{%
  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}

\title{Test}
\author{}

\begin{document}
\maketitle
\begin{itemize}
\tightlist
\item
\begin{itemize}
\tightlist
\item
soukromé financování také obvykle není dostupné ve všech oborech
rovnoměrně (např. soukromé finance je snažší získat na výzkum dětské
            leukemie než na léčbu rezistentní tuberkulózy) a soustředí se na
prestižní týmy/vědce/univerzity
\end{itemize}
\end{itemize}
\end{document}
)"

tmp <- tempfile(fileext = ".tex")
writeLines(tex_source, tmp)
tinytex::pdflatex(tmp, clean = FALSE)

Output of xfun::session_info('tinytex'):

R version 4.2.1 (2022-06-23 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19045), RStudio 2023.9.0.463

Locale: LC_COLLATE=Czech_Czechia.utf8  LC_CTYPE=Czech_Czechia.utf8    LC_MONETARY=Czech_Czechia.utf8 LC_NUMERIC=C                   LC_TIME=Czech_Czechia.utf8    

Package version:
  graphics_4.2.1  grDevices_4.2.1 stats_4.2.1     tinytex_0.47.2  tools_4.2.1     utils_4.2.1     xfun_0.40.1    

LaTeX version used: 
  TeX Live 2022 (TinyTeX) with tlmgr 2022-04-18

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[yihui]

Should be fixed now. Thanks for the report!

You can install the development version via

remotes::install_github('rstudio/tinytex')

[martinmodrak]

Confirmed fix. Thanks very much, that was lightning speed.

[yihui]

Lightning speed thanks to the high-quality reproducible example! :)

New version (0.48) is on CRAN now: https://cran.r-project.org/package=tinytex