\ProvidesFile{ext-authoryear-terse.cbx}
  [2019/04/04 v0.7a extended biblatex authoryear-terse
   citation style (MW)]

\RequireCitationStyle{ext-authoryear}
\ExecuteBibliographyOptions{singletitle, uniquename, uniquelist,
  autocite=inline}

\renewbibmacro*{cite}{%
  \iffieldundef{shorthand}
    {\ifthenelse{\ifnameundef{labelname}\OR\iffieldundef{labelyear}}
       {\usebibmacro{cite:label}%
        \setunit{\printdelim{nonameyeardelim}}}
       {\ifsingletitle
          {\printtext[bibhyperref]{\printnames{labelname}}}
          {\printnames{labelname}%
           \setunit{\printdelim{nameyeardelim}}%
           \usebibmacro{cite:labeldate+extradate}}}}%
    {\usebibmacro{cite:shorthand}}}

\renewbibmacro*{textcite}{%
  \ifnameundef{labelname}
    {\iffieldundef{shorthand}
       {\usebibmacro{cite:label}%
        \setunit{%
          \global\booltrue{cbx:parens}%
          \printdelim{nonameyeardelim}%
          \csuse{extblx@citedelim@\blx@delimcontext @inner@open}}%
        \ifnumequal{\value{citecount}}{1}
          {\usebibmacro{prenote}}
          {}%
        \usebibmacro{cite:labeldate+extradate}}
       {\usebibmacro{cite:shorthand}}}
    {\ifthenelse{\ifsingletitle\AND
                 \(\iffieldundef{prenote}\OR\value{citecount}>1\)}
       {\printtext[bibhyperref]{\printnames{labelname}}}
       {\printnames{labelname}%
        \setunit{%
          \global\booltrue{cbx:parens}%
          \printdelim{nameyeardelim}%
          \csuse{extblx@citedelim@\blx@delimcontext @inner@open}}%
        \ifnumequal{\value{citecount}}{1}
          {\usebibmacro{prenote}}
          {}%
        \usebibmacro{citeyear}}}}

\endinput
%
% This file is part of the biblatex-ext bundle.
% biblatex-ext is released under the LaTeX Project Public License v1.3c
% or later.
%
% A complete list of files included in that package can be found in
% README.md or - failing that - in ext-standard.bbx.
%
% Official releases of this package are on CTAN
%   https://www.ctan.org/pkg/biblatex-ext
% development takes place on GitHub
%   https://github.com/moewew/biblatex-ext
%