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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{mkessler-faktor}[2021/10/25 - Faktor package that also handles cofaktors]



% Extension the faktor package for 
% - cofaktor command that provides A \ B notation
% - scaling the / in the middle
% - fine positioning of enumerator / denominator

% This is essentially taken from the stackexchange question found at
% https://tex.stackexchange.com/questions/27591/extending-the-faktor-package
% and answered by 'Werner' (https://tex.stackexchange.com/users/5764/werner)
%
% This package only packages the corresponding answer and provides an analoguous way of a \cofactor command

%Dependencies
\RequirePackage{xparse}
\RequirePackage{amssymb} % provides \diagup and \diagdown
\RequirePackage{ifthen} % ifthenelse syntax
\RequirePackage{mathtools}


\DeclareDocumentCommand{\faktor}{s O{0.5} m O{-0.5} m}{% \newfaktor[*][#2]{#3}[#4]{#5} -> #3/#5
  \setbox0=\hbox{\ensuremath{#3}}% Store numerator
  \setbox1=\hbox{\ensuremath{\diagup}}% Store slash /
  \setbox2=\hbox{\ensuremath{#5}}% Store denominator
  \raisebox{#2\ht1}{\usebox0}% Numerator
  \mkern-5mu\ifthenelse{\equal{#1}{\BooleanTrue}}% Slash /
    {\diagup}% regular \faktor slash
    {\rotatebox{-44}{\rule[#4\ht2]{0.4pt}{-#4\ht2+#2\ht0+\ht0}}}% tilted rule as a slash
  \mkern-4mu%
  \raisebox{#4\ht2}{\usebox2}% Denominator
}

\DeclareDocumentCommand{\cofaktor}{s m O{-0.5} m O{0.5}}{% \newfaktor[*][#2]{#3}[#4]{#5} -> #2\#4
  \setbox0=\hbox{\ensuremath{#3}}% Store numerator
  \setbox1=\hbox{\ensuremath{\diagdown}}% Store slash /
  \setbox2=\hbox{\ensuremath{#5}}% Store denominator
  \raisebox{#2\ht1}{\usebox0}% Numerator
  \mkern-5mu\ifthenelse{\equal{#1}{\BooleanTrue}}% Slash /
    {\diagdown}% regular \faktor slash
    {\rotatebox{44}{\rule[-#4\ht2]{0.4pt}{#4\ht2-#2\ht0+\ht0}}}% tilted rule as a slash
  \mkern-4mu%
  \raisebox{#4\ht2}{\usebox2}% Denominator
}