Multilingual bibliography and automatic indexing

Question

I use biblatex to build:

An automatic index of the cited author of the bibliography.
A bibliography in a single language with the punctuation rules taken from langid of each entry.

As discussed in the comments of this last answer, the solutions work very independently, but I get the following error when trying to mix both:

! Undefined control sequence.
\blx@nameparser@i ...pandafter {\mblx@currentname
}{\mblx@exemptfields } {\b...
l.142 \footcite{compagnon}

I tried to "exempt" the author field from the patch, without success. Is this achievable or would the patch become unreasonable?

Here's a test code, commenting the long patch allows to build the index:

\documentclass{article}
\usepackage[english,french]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{makeidx}
\usepackage[backend=biber,
    style=verbose-trad2,
    singletitle=true,
    indexing=cite,
]{biblatex}
\makeindex
\renewbibmacro*{citeindex}{
  \ifciteindex
    {\indexnames{labelname}}
    {}}
\makeatletter
\newcommand{\mblx@exemptfields}{}
\newrobustcmd{\ExemptFromLanguageSwitching}{%
  \forcsvlist{\listgadd\mblx@exemptfields}}
\def\blx@thefakelangenv{otherlanguage}%
\def\blx@beglang@fake{%
  \blx@clearlang
  \begingroup
  \ifdef\abx@field@langid
    {\def\blx@endlang@fake{%
       \end{otherlanguage}%
       \endgroup}%
     \begin{otherlanguage}{\abx@field@langid}}
    {}}
\let\blx@endlang@fake\relax
\renewrobustcmd*{\blx@imc@printfield}[2][]{%
  \blx@imc@iffieldundef{#2}
    {\blx@nounit}
    {\blx@getformat\blx@theformat{ffd}{#1}{#2}%
     \ifdefvoid\blx@theformat
       {\blx@nounit}
       {\blx@begunit
        \ifinlist{#2}{\mblx@exemptfields}
          {}
          {\let\blx@theformat@outer\blx@theformat
           \def\blx@theformat##1{\blx@theformat@outer{\blx@beglang@fake ##1\blx@endlang@fake}}}%
        \edef\currentfield{#2}%
        \expandafter\expandafter
        \expandafter\blx@theformat
        \expandafter\expandafter
        \expandafter{\csname abx@field@#2\endcsname}%
        \blx@endunit}}}
\catcode`&amp;=3
\def\blx@printnames#1#2#3#4{%
  \blx@imc@ifnameundef{#4}
    {\blx@nounit}
    {\def\mblx@currentname{#4}%
     \blx@getformat\blx@thewrapperformat{nwd}{#1}{#4}%
     \ifdefvoid\blx@thewrapperformat
       {\blx@nounit}
       {\blx@getformat\blx@theformat{nfd}{#1}{#4}%
        \ifdefvoid\blx@theformat
          {\blx@nounit}
          {\blx@begunit
           \blx@namesetup{#2}{#3}{#4}%
           \blx@thewrapperformat{\expandafter\blx@nameparser\blx@thedata{}&}%
           \blx@endunit}}}}
\long\def\blx@nameparser@i#1#2{%
  \begingroup
  \ifblank{#1}
    {}
    {\setkeys{blx@opt@name}{#1}}%
  \setkeys{blx@opt@namepart}{#2}%
  \expandafter\ifinlist\expandafter{\mblx@currentname}{\mblx@exemptfields}
    {\blx@theformat{#2}}
    {\blx@beglang@fake\blx@theformat{#2}\blx@endlang@fake}%
  \endgroup}
\def\blx@printlist#1#2#3#4{%
  \blx@imc@iflistundef{#4}
    {\blx@nounit}
    {\def\mblx@currentlist{#4}%
     \blx@getformat\blx@thewrapperformat{lwd}{#1}{#4}%
     \ifdefvoid\blx@thewrapperformat
       {\blx@nounit}
       {\blx@getformat\blx@theformat{lfd}{#1}{#4}%
        \ifdefvoid\blx@theformat
          {\blx@nounit}
          {\blx@begunit
           \blx@listsetup{#2}{#3}{#4}%
           \blx@thewrapperformat{\expandafter\blx@listparser\blx@thedata{}&}%
           \blx@endunit}}}}
\long\def\blx@listparser#1{%
  \ifblank{#1}
    {\blx@listbreak}
    {\ifnum\c@listcount<\c@liststart
     \else
       \expandafter\ifinlist\expandafter{\mblx@currentlist}{\mblx@exemptfields}
         {\blx@theformat{#1}}
         {\blx@beglang@fake\blx@theformat{#1}\blx@endlang@fake}%
     \fi
     \advance\c@listcount@ne
     \ifnum\c@listcount>\c@liststop
       \expandafter\blx@listbreak
     \fi
     \blx@listparser}}
\makeatother
\catcode`&amp;=4
\ExemptFromLanguageSwitching{url,doi,eprint,pages}
\begin{filecontents}[force]{\jobname.bib}
@book{compagnon,
  author     = {Compagnon, Antoine and Someone Else},
  translator = {Même, Moi},
  date       = {1998},
  title      = {Titre: aléatoire?},
  pages      = {306-723},
  langid     = {french},
  url        = {https://example.com/~stuff/more.pdf},
}
@book{glashow,
  author       = {Glashow, Sheldon and Someone Else},
  title        = {Random: title?},
  translator   = {Self, My},
  date         = {1961},
  pages        = {579-588},
  langid       = {english},
  url          = {https://example.com/~stuff/more.pdf},
}
\end{filecontents} 
\addbibresource{\jobname.bib}
\begin{document}
\footcite{compagnon}
\footcite{glashow}
\printindex
\printbibliography
\end{document}

score 1 · Accepted Answer · answered Mar 09 '22 at 16:52

The code in Punctuations rules in multilingual bilbiography should have probably not only patched \printnames and \printlist, but also \indexnames and \indexlist. (This is now fixed there as well.)

The following code should compile.

\documentclass{article}
\usepackage[english,french]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{makeidx}
\usepackage[backend=biber,
    style=verbose-trad2,
    singletitle=true,
    indexing=cite,
]{biblatex}
\makeindex
\renewbibmacro*{citeindex}{
  \ifciteindex
    {\indexnames{labelname}}
    {}}
\makeatletter
\newcommand{\mblx@exemptfields}{}
\newrobustcmd{\ExemptFromLanguageSwitching}{%
  \forcsvlist{\listgadd\mblx@exemptfields}}
\def\blx@thefakelangenv{otherlanguage}%
\def\blx@beglang@fake{%
  \blx@clearlang
  \begingroup
  \ifdef\abx@field@langid
    {\def\blx@endlang@fake{%
       \end{otherlanguage}%
       \endgroup}%
     \begin{otherlanguage}{\abx@field@langid}}
    {}}
\let\blx@endlang@fake\relax
\renewrobustcmd*{\blx@imc@printfield}[2][]{%
  \blx@imc@iffieldundef{#2}
    {\blx@nounit}
    {\blx@getformat\blx@theformat{ffd}{#1}{#2}%
     \ifdefvoid\blx@theformat
       {\blx@nounit}
       {\blx@begunit
        \ifinlist{#2}{\mblx@exemptfields}
          {}
          {\let\blx@theformat@outer\blx@theformat
           \def\blx@theformat##1{\blx@theformat@outer{\blx@beglang@fake ##1\blx@endlang@fake}}}%
        \edef\currentfield{#2}%
        \expandafter\expandafter
        \expandafter\blx@theformat
        \expandafter\expandafter
        \expandafter{\csname abx@field@#2\endcsname}%
        \blx@endunit}}}
\catcode`&amp;=3
\def\blx@printnames#1#2#3#4{%
  \blx@imc@ifnameundef{#4}
    {\blx@nounit}
    {\def\mblx@currentname{#4}%
     \blx@getformat\blx@thewrapperformat{nwd}{#1}{#4}%
     \ifdefvoid\blx@thewrapperformat
       {\blx@nounit}
       {\blx@getformat\blx@theformat{nfd}{#1}{#4}%
        \ifdefvoid\blx@theformat
          {\blx@nounit}
          {\blx@begunit
           \blx@namesetup{#2}{#3}{#4}%
           \blx@thewrapperformat{\expandafter\blx@nameparser\blx@thedata{}&}%
           \blx@endunit}}}}
\def\blx@indexnames#1#2#3#4{%
  \blx@imc@ifnameundef{#4}
    {}
    {\def\mblx@currentname{#4}%
     \blx@getformat\blx@theformat{nid}{#1}{#4}%
     \ifdefvoid\blx@theformat
       {}
       {\begingroup
        \blx@namesetup{#2}{#3}{#4}%
        \blx@indexnamesetup
        \expandafter\blx@nameparser\blx@thedata{}&%
        \endgroup}}}
\long\def\blx@nameparser@i#1#2{%
  \begingroup
  \ifblank{#1}
    {}
    {\setkeys{blx@opt@name}{#1}}%
  \setkeys{blx@opt@namepart}{#2}%
  \expandafter\ifinlist\expandafter{\mblx@currentname}{\mblx@exemptfields}
    {\blx@theformat{#2}}
    {\blx@beglang@fake\blx@theformat{#2}\blx@endlang@fake}%
  \endgroup}
\def\blx@printlist#1#2#3#4{%
  \blx@imc@iflistundef{#4}
    {\blx@nounit}
    {\def\mblx@currentlist{#4}%
     \blx@getformat\blx@thewrapperformat{lwd}{#1}{#4}%
     \ifdefvoid\blx@thewrapperformat
       {\blx@nounit}
       {\blx@getformat\blx@theformat{lfd}{#1}{#4}%
        \ifdefvoid\blx@theformat
          {\blx@nounit}
          {\blx@begunit
           \blx@listsetup{#2}{#3}{#4}%
           \blx@thewrapperformat{\expandafter\blx@listparser\blx@thedata{}&}%
           \blx@endunit}}}}
\def\blx@indexlist#1#2#3#4{%
  \blx@imc@iflistundef{#4}
    {}
    {\def\mblx@currentlist{#4}%
     \blx@getformat\blx@theformat{lid}{#1}{#4}%
     \ifdefvoid\blx@theformat
       {}
       {\begingroup
        \blx@listsetup{#2}{#3}{#4}%
        \expandafter\blx@listparser\blx@thedata{}&%
        \endgroup}}}
\long\def\blx@listparser#1{%
  \ifblank{#1}
    {\blx@listbreak}
    {\ifnum\c@listcount<\c@liststart
     \else
       \expandafter\ifinlist\expandafter{\mblx@currentlist}{\mblx@exemptfields}
         {\blx@theformat{#1}}
         {\blx@beglang@fake\blx@theformat{#1}\blx@endlang@fake}%
     \fi
     \advance\c@listcount@ne
     \ifnum\c@listcount>\c@liststop
       \expandafter\blx@listbreak
     \fi
     \blx@listparser}}
\makeatother
\catcode`&amp;=4
\ExemptFromLanguageSwitching{url,doi,eprint,pages}
\begin{filecontents}{\jobname.bib}
@book{compagnon,
  author     = {Compagnon, Antoine and Someone Else},
  translator = {Même, Moi},
  date       = {1998},
  title      = {Titre: aléatoire?},
  pages      = {306-723},
  langid     = {french},
  url        = {https://example.com/~stuff/more.pdf},
}
@book{glashow,
  author       = {Glashow, Sheldon and Someone Else},
  title        = {Random: title?},
  translator   = {Self, My},
  date         = {1961},
  pages        = {579-588},
  langid       = {english},
  url          = {https://example.com/~stuff/more.pdf},
}
\end{filecontents} 
\addbibresource{\jobname.bib}
\begin{document}
\footcite{compagnon}
\footcite{glashow}
\printindex
\printbibliography
\end{document}

As always, you post answers faster than I can post questions! I'm checking for side effects. Thanks again. — letax, Mar 09 '22 at 17:00
An unwanted side effect was finally spotted: the "p." for the page range appears when needed in the bibliography, but never in the footnote where the reference is called. This can be seen in the example calling eg. \footcite[36]{compagnon} — letax, Mar 15 '22 at 17:45
@letax You need to also exempt the postnote field from the language switching. — moewe, Mar 15 '22 at 19:29

Multilingual bibliography and automatic indexing

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