How to change part name in TOC only (with babel)? Or How to patch a bug in babel french with amsart

Question

When I use babel with french option and amsart, I get the word "partie" in the TOC and not "Partie" which is the correct typographic rule in french (in the main document I get "Première partie" which is ok because "partie" is not the first word so not cap needed).

Here is my MWE

\documentclass{amsart}
\usepackage[french]{babel}

\begin{document}
\tableofcontents
\part{Essai}

\end{document}

I just want to correct this mistake without using titletoc package. Does anybody have a solution?

Answer 1

As already pointed out, babel-french's option PartNameFull=false provides a fix: then you get "Partie I", "Partie II" (Roman numerals) both in the document and in the TOC.

In order to get "Première partie" both in the document and in the TOC, you could try something like this:

\documentclass[french]{amsart}
\usepackage{babel}
\usepackage{blindtext}
% Patch amsart.cls:
\usepackage{etoolbox}
\makeatletter
\patchcmd{\@sect}{\@seccntformat{#1}}%
                 {\ifx0#2\unskip.\quad\else\@seccntformat{#1}\fi}{}{}
% To get "Première partie." in the TOC:
\renewcommand{\tocpart}[3]{\indentlabel\ignorespaces
   \ifcase#2\or{Première}\or{Deuxième}\or{Troisième}\else{?}\fi
   \space\partnameord.\quad#3}
% To get "Partie 1." in the TOC only, uncomment these two lines:
%\renewcommand{\tocpart}[3]{\indentlabel\ignorespaces
%   Partie\space#2.\quad#3}
\makeatother
\begin{document}
\tableofcontents
\part{Un essai}
\blindtext
\section{test test test}
\blindtext
\part{Second essai}
\end{document}

This works for up to three parts, extending the \tocpart command is obvious in case you need more.

With amsbook.cls, you could use etoolbox this way:

\documentclass[french]{amsbook}
\usepackage{babel}
\usepackage{etoolbox}
\makeatletter
\patchcmd{\@part}{\ \thepart}{}{}{}
\makeatother

Each class would require a specific treatment, so I just provide the PartNameFull=false option in babel-french to work around this issue.

Answer 2

Add in your preamble the code

\addto\captionsfrench{% <===============================================
  \renewcommand\partname{Partie}%
}

A complete MWE with two parts

\documentclass{amsart}

\usepackage[french]{babel}
\usepackage{blindtext}

\addto\captionsfrench{% <===============================================
  \renewcommand\partname{Partie}%
}


\begin{document}
\tableofcontents
\part{Essai}
\blindtext
\section{test test test}
\blindtext
\part{test part 2}

\end{document}

gives you the following result:

BTW: in the manual of babel-french you can find in chapter 1.2.1 \frenchsetup:

and please see the red marked text there. The resulting pdf is the same I showed above.

With option PartNameFull=true in the mwe above you get the following pdf:

Please see the wrong TOC entries for the parts: It should be Partie 1 instead partie 1 or it should be Première partie without number.

This bug should be reported to the author of babel-french, e-mail address see the documentation (texdoc babel-french).