# How to make \autocites work as \supercite with square brackets and grouped

I found how to make \supercite with square brackets and grouped at Biblatex supercite with square brackets and grouped

So I add the option autocite=superscript for biblatex package, and get this MWE:

\documentclass{article}

\usepackage[autocite=superscript,citestyle=numeric-comp]{biblatex}

\DeclareCiteCommand{\supercite}[\mkbibsuperscript]
{\usebibmacro{cite:init}%
\let\multicitedelim=\supercitedelim
\iffieldundef{prenote}
{}
{\BibliographyWarning{Ignoring prenote argument}}%
\iffieldundef{postnote}
{}
{\BibliographyWarning{Ignoring postnote argument}}%
\bibopenbracket}%
{\usebibmacro{citeindex}%
\usebibmacro{cite:comp}}
{}
{\usebibmacro{cite:dump}\bibclosebracket}

\usepackage{filecontents}

\begin{filecontents}{test.bib}
@book{A01,
author = {Author, A.},
year = {2001},
title = {Alpha},
}
@book{B02,
author = {Buthor, B.},
year = {2002},
title = {Bravo},
}
@article{C03,
author = {Cuthor, C.},
year = {2003},
title = {Charlie},
}
\end{filecontents}

\begin{document}

We are citing \autocites{A01}{B02}{C03} and \autocites{A01}{C03} and \autocites*{A01}{B02}.

\printbibliography

\end{document}


But the number is not grouped. I get [1],[2],[3] instead of [1-3].

The issue here is twofold.

1. You can get better results by moving the brackets into the wrapper command instead of the pre- and post-code and doing the same thing for the multicite command.

2. The multicite commands do not sort or compress citations across different groups. See also https://github.com/plk/biblatex/issues/817 (there are inelegant workarounds available as the last post in the linked discussion shows).

For now, all I can offer is

\documentclass{article}

\usepackage[style=numeric-comp, autocite=superscript]{biblatex}

\newrobustcmd*{\mkbibbracketedsuperscript}[1]{%
\mkbibsuperscript{\mkbibbrackets{#1}}}

\DeclareCiteCommand{\supercite}[\mkbibbracketedsuperscript]
{\usebibmacro{cite:init}%
\let\multicitedelim=\supercitedelim
\iffieldundef{prenote}
{}
{\BibliographyWarning{Ignoring prenote argument}}%
\iffieldundef{postnote}
{}
{\BibliographyWarning{Ignoring postnote argument}}}%
{\usebibmacro{citeindex}%
\usebibmacro{cite:comp}}
{}
{\usebibmacro{cite:dump}}

\DeclareMultiCiteCommand{\supercites}[\mkbibbracketedsuperscript]
{\supercite}{\supercitedelim}