biblatex-certrand.sty

% Define a "Certified Random" citation option for biblatex
% Usage:
% Add this field to your bib entry:
% author+an = {=certrand},
% Then cite as normal!




% Code here: https://tex.stackexchange.com/a/489891

\newcommand*{\ifcertrand}{\iffieldannotation{certrand}}

\newcommand*{\certrandorelse}[1]{%
  \ifcertrand
    {\addspace\textcircled{r}\space}
    {#1}}

\DeclareDelimFormat{multinamedelim}{\certrandorelse{\addcomma\space}}
\DeclareDelimFormat{finalnamedelim}{%
  \certrandorelse{%
    \ifnumgreater{\value{liststop}}{2}{\finalandcomma}{}%
    \addspace\bibstring{and}\space}}

\NewBibliographyString{certrandothers}
\DefineBibliographyStrings{american}{%
  certrandothers = {\textcircled{r} al\adddot},
}
\renewbibmacro*{name:andothers}{%
  \ifboolexpr{
    test {\ifnumequal{\value{listcount}}{\value{liststop}}}
    and
    test \ifmorenames
  }
    {\ifcertrand
       {\printdelim{andothersdelim}\bibstring{certrandothers}}
       {\ifnumgreater{\value{liststop}}{1}
          {\finalandcomma}
          {}%
        \printdelim{andothersdelim}\bibstring{andothers}}}
    {}}