biblatex-mnras.cbx

%% ---------------------------------------------------------------
%% biblatex-mnras --- A biblatex implementation of the MNRAS
%%   citation style
%% Maintained by Fabian Scheuermann
%% E-mail: f.scheuermann@uni-heidelberg.de
%% Released under the LaTeX Project Public License v1.3c or later
%% See http://www.latex-project.org/lppl.txt
%% ---------------------------------------------------------------
%% 

\ProvidesFile{biblatex-mnras.cbx}[2022/06/10 v1.0 biblatex citation style]

% Load the standard style to avoid copy-pasting unnecessary material
\RequireCitationStyle{authoryear-comp}

\ExecuteBibliographyOptions{
citetracker=true,   % we need this to change to et al. the second time
mincitenames=1,
maxcitenames=2,
sorting=ynt,
uniquename=false,
uniquelist=false
}

% use ampercent between authors
% https://tex.stackexchange.com/questions/455828/biblatex-multiple-authors-and-should-become-dot-between-title-and-pu
\DeclareDelimFormat{finalnamedelim}{\addspace\&\space}
% remove a comma between name and year if natbib=true ist used
\DeclareDelimFormat{nameyeardelim}{\addspace}

% up to theree authors are written out but second time et al. is used
% https://tex.stackexchange.com/questions/48846/biblatex-et-al-beginning-from-second-citation
\AtEveryCitekey{\ifciteseen{}{\defcounter{maxnames}{3}}}


% the citealias commands (from natbib=true) do not contain hyperlinks
\DeclareCiteCommand{\citetalias}
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \printtext[bibhyperref]{\@citealias{\thefield{entrykey}}}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\citepalias}[\mkbibparens]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \printtext[bibhyperref]{\@citealias{\thefield{entrykey}}}}
  {\multicitedelim}
  {\usebibmacro{postnote}}