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It is not a serious issue, but I would like to know why this happens.

If I compile

\documentclass[ngerman]{scrartcl}
\usepackage[ngerman]{babel}
\title{Title}
\date{\today}
\usepackage{igo}
\begin{document}
\maketitle
\end{document}

the output looks like an English version, i.e. the format of the date is English. Without using the igo-package, everything is working properly. I looked into the sty-file and also in the used repeat.tex file but I can't find the reason for this.

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  • The igo package does not appear to be included in the TeXLive distrubution. Is it available online? If so, where?
    – Mico
    Jul 25, 2022 at 13:21
  • 2
    @Mico Its license is deemed “nonfree”, so it cannot be in TeX Live. But it's on CTAN and included in MiKTeX.
    – egreg
    Jul 25, 2022 at 13:21
  • here the link to the package: ctan.org/pkg/igo
    – Ulrich
    Jul 25, 2022 at 13:27
  • 2
    the package loads repeat.tex which redefines \repeat and breaks so various loops including the babel loop. It also redefines font size commands. I would avoid to use it.
    – Ulrike Fischer
    Jul 25, 2022 at 14:11
  • 1
    you can avoid to use the igo package. Or you can change it to use \Repeat instead of \repeat and reinstate the original \repeat along this line tex.stackexchange.com/a/62381/2388. In any case I would not use igo as it is.
    – Ulrike Fischer
    Jul 25, 2022 at 15:35

1 Answer 1

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Because repeat.tex redefines \repeat which the LaTeX kernel uses in the \loop...\repeat construction and, in order to work as described in plain.tex, it is mandatory that the meaning of \repeat is the same as \fi.

You can modify igo.sty to avoid the problem.

After \input{repeat.tex} add

\let\REPEAT\repeat
\let\repeat\fi

and change all occurrences of \repeat in the code of igo.sty with \REPEAT.

It is also better if you change all the code in the Define size of stones section with

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Define size of stones in text (Nikolai Nemov, from size10.clo)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\AddToHook{cmd/normalsize/after}{\def\stonesize{\igo@fonts{9}}}
\AddToHook{cmd/small/after}{\def\stonesize{\igo@fonts{8}}}
\AddToHook{cmd/footnotesize/after}{\def\stonesize{\igo@fonts{7}}}
\AddToHook{cmd/scriptsize/after}{\def\stonesize{\igo@fonts{6}}}
\AddToHook{cmd/tiny/after}{\def\stonesize{\igo@fonts{5}}}
\AddToHook{cmd/large/after}{\def\stonesize{\igo@fonts{10}}}
\AddToHook{cmd/Large/after}{\def\stonesize{\igo@fonts{11}}}
\AddToHook{cmd/LARGE/after}{\def\stonesize{\igo@fonts{12}}}
\AddToHook{cmd/huge/after}{\def\stonesize{\igo@fonts{15}}}
\AddToHook{cmd/Huge/after}{\def\stonesize{\igo@fonts{20}}}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

It's good igo.sty is not in TeX Live…

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