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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{mkessler-exsheet}[2022/01/30 - Include exercise sheets into lecture notes easily.]



\RequirePackage{xkeyval}
\newif\ifmkessler@exsheet@english\mkessler@exsheet@englishtrue
\DeclareOptionX{german}{\mkessler@exsheet@englishfalse}
\DeclareOptionX{ngerman}{\mkessler@exsheet@englishfalse}
\DeclareOptionX{english}{\mkessler@exsheet@englishtrue}

\DeclareOptionX*{\PackageWarning{mkessler-exsheet}{Unknown '\CurrentOption'}}
\ProcessOptionsX*\relax


\RequirePackage{mkessler-fancythm}


\def\mkessler@exsheet@sheet{
    \ifmkessler@exsheet@english Exercise Sheet\else Übungsblatt\fi
}

\newcounter{mkessler@exsheet@sheet}

\declaretheorem[style=thmgreenmargin, numberwithin=mkessler@exsheet@sheet, name=\ifmkessler@exsheet@english Exercise\else Aufgabe\fi]{mkessler@exsheet@sheetexercise}

\usepackage{xkeyval}

\NewDocumentEnvironment{sheetexercise}{O{}}{
\begin{mkessler@exsheet@sheetexercise\expandafter}\if\relax\detokenize{#1}\relax\else[#1]\fi\label{exercise-\themkessler@exsheet@sheetexercise}
}{
    \end{mkessler@exsheet@sheetexercise\expandafter}\relax
}

\newcommand\exercisesheet{
    \refstepcounter{mkessler@exsheet@sheet}
    \subsection*{\themkessler@exsheet@sheet. \mkessler@exsheet@sheet}
    \addcontentsline{toc}{subsection}{\themkessler@exsheet@sheet. \mkessler@exsheet@sheet}
}