Beamer-Version

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diff --git a/exercisesheets-beamer.sty b/exercisesheets-beamer.sty
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+%% exercisesheets-beamer.sty
+%% Copyright 2008-2020 Sebastian Kuhnert, Frank Fuhlbrück
+%
+% This work may be distributed and/or modified under the conditions
+% of the LaTeX Project Public License, either version 1.3c of this
+% license or (at your option) any later version. The latest version
+% of this license is in https://www.latex-project.org/lppl.txt and
+% version 1.3c or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status `maintained'.
+%
+% The Current Maintainer of this work is Sebastian Kuhnert.
+%
+% This work consists of the files listed in README.
+
+
+%\NeedsTeXFormat{LaTeX2e}[1994/12/01]
+
+% don't forget to update the version and date in exercisesheets.tex
+\def\exsh@version{0.7-Beamer}
+\def\exsh@date{2020/10/14}
+
+\ProvidesPackage{exercisesheets-beamer}[\exsh@date\space\exsh@version\space Typesetting of exercise sheets]
+\message{`Typesetting of exercise sheets' \exsh@version\space <\exsh@date>}
+
+% TODO: fix "above hint skip"
+
+
+\RequirePackage{etoolbox}[2008/06/28]
+\RequirePackage{scrlfile}
+
+\RequirePackage{pgfkeys}
+\RequirePackage{keyval}
+\RequirePackage{kvoptions}
+
+\RequirePackage{ifthen}
+\RequirePackage{ifluatex}
+
+\RequirePackage{amsmath}
+
+\RequirePackage{currfile}
+\RequirePackage{catchfile}
+
+% configuration keys
+
+\newif\ifexsh@solutions
+\newif\ifexsh@oralsolutions
+\newif\ifexsh@nonoralsolutions
+\newif\ifexsh@samplesolutions
+\newif\ifexsh@forcesample %force printing sample sol. of wrong type
+\newif\ifexsh@beamersolution
+\newif\ifexsh@gradingguides
+\newif\ifexsh@inplace
+\newif\ifexsh@sample
+\newif\ifexsh@hide%currently only set via sample in exercise env.
+\newif\ifexsh@pointsfloatright
+\newif\ifexsh@bonus
+\newif\ifexsh@abbrev
+
+\pgfkeys{/exsh/.is family,/exsh,
+  solutions/.is choice,
+  solutions/true/.code=\exsh@solutionstrue\exsh@oralsolutionstrue\exsh@nonoralsolutionstrue,
+  solutions/oral/.code=\exsh@solutionstrue\exsh@oralsolutionstrue\exsh@nonoralsolutionsfalse,
+  solutions/nonoral/.code=\exsh@solutionstrue\exsh@oralsolutionsfalse\exsh@nonoralsolutionstrue,
+  solutions/sample nonoral/.code=\exsh@solutionstrue\exsh@oralsolutionsfalse\exsh@nonoralsolutionstrue\exsh@samplesolutionstrue,
+  solutions/sample oral/.code=\exsh@solutionstrue\exsh@oralsolutionstrue\exsh@nonoralsolutionsfalse\exsh@samplesolutionstrue,
+  solutions/sample all/.code=\exsh@solutionstrue\exsh@oralsolutionstrue\exsh@nonoralsolutionstrue\exsh@samplesolutionstrue,
+  solutions/false/.code=\exsh@solutionsfalse\exsh@oralsolutionsfalse\exsh@nonoralsolutionsfalse,
+  solutions/.default=true,
+  forcesample/.is if=exsh@forcesample,
+  forcesample/.default=true,
+  beamersolution/.is if=exsh@beamersolution,
+  beamersolution/.default=true,
+  gradingguides/.is if=exsh@gradingguides,
+  gradingguides/.default=true,
+  only/.initial={-},
+  all/.style={/exsh/only={-}},all/.value forbidden,
+  solutionsby/.code={\def\exsh@solutionsby{#1}},solutionsby/.value required,
+  bonus/.is if=exsh@bonus,
+  bonus/.default=true,
+  inplace/.is if=exsh@inplace,
+  inplace/.default=true,
+  sample/.is if=exsh@sample,
+  sample/.default=true,
+  pointsfloatright/.is if=exsh@pointsfloatright,
+  pointsfloatright/.default=true,
+  abbrev/.is if=exsh@abbrev,
+  abbrev/.default=true,
+}
+
+\providecommand{\@subject}{}
+% store title data for sheet headers
+\ifundef\subject{% \subject is only provided by KOMA classes
+  \newcommand{\subject}[1]{}%
+  \def\@subject{}%
+}{}
+\apptocmd{\subject}{\pgfkeys{/exsh/subject={#1}}}{}{}%
+\ifdefempty{\@subject}{
+  \pgfkeys{exsh,subject/.initial={\PackageWarning{exercisesheets-beamer}{No \string\subject\space given}}}
+}{
+  \pgfkeys{/exsh/subject/.initial/.expand once=\@subject}
+}
+\ifdefstring{\@date}{\today}{
+  \pgfkeys{/exsh/semester/.initial={\PackageWarning{exercisesheets-beamer}{No semester given in \string\date}}}
+}{
+  \pgfkeys{/exsh/semester/.initial/.expand once=\@date}
+}
+\let\@exsh@origdate\date
+\renewcommand{\date}[1]{\@exsh@origdate{#1}\pgfkeys{/exsh/semester={#1}}}
+% this breaks (likely because of detokenization):
+% -> missing \begin{document}
+% \apptocmd{\date}{\pgfkeys{/exsh/semester={#1}}}{}{}
+\pgfkeys{/exsh/author/.code={%
+    \def\exsh@author{#1}%
+    \def\exsh@repeat{1}%
+    \loop\ifnum\exsh@repeat>0
+      \def\exsh@repeat{0}%
+      \patchcmd{\exsh@author}{\and}{, }{\def\exsh@repeat{1}}{}%
+    \repeat
+  },
+  /exsh/author/.expand once=\@author}
+\let\exsh@oldauthor\author
+\def\author#1{\exsh@oldauthor{#1}\pgfkeys{/exsh/author={#1}}}
+
+% helper macro for automatic language selection
+\newif\ifexsh@provideonly
+\def\exsh@deforprovide#1#2{%
+  \ifthenelse{\(\NOT\boolean{exsh@provideonly}\)
+    \OR \equal{}{\pgfkeysvalueof{#1}}}{%
+    \pgfkeys{#1=#2}%
+  }{}%
+}
+
+\pgfkeys{exsh,
+  % additional sheet info
+  title/.initial={},
+  date/.initial={},
+  note/.initial={},
+  exauthor/.initial={\exsh@author},
+  %
+  % additional exercise info
+  name/.initial={},
+  forcesample/.initial={false},
+  beamersolution/.initial={false},
+  firstline/.initial={},
+  points/.initial={},
+  oral/.style={/exsh/points=oral},oral/.value forbidden,
+  inplace/.initial={false},
+  sample/.initial={false},
+  pointsfloatright/.initial={false},
+  bonus/.initial={false},
+  nobonus/.style={/exsh/bonus=false},nobonus/.value forbidden,
+  abbrev/.initial={false},
+  noabbrev/.style={/exsh/abbrev=false},noabbrev/.value forbidden,
+  pointsinfo/.initial={},
+  optional/.style={/exsh/pointsinfo=\ifexsh@abbrev%
+       \pgfkeysvalueof{/exsh/strings/optional abbrev}%
+    \else%
+       \pgfkeysvalueof{/exsh/strings/optional}%
+    \fi},
+  optional/.value forbidden,
+  exercisemark/.initial={},
+  difficult/.style={/exsh/exercisemark=*},difficult/.value forbidden,
+  custom skip macro/.initial=\exsh@skipcustomstuff,
+  %
+  % translatable strings
+  strings/sheet/.initial={},
+  strings/sheets/.initial={},
+  strings/solutions/.initial={},
+  strings/solutionsby/.initial={},
+  strings/gradingguide/.initial={},
+  strings/exercise/.initial={},
+  strings/solution/.initial={},
+  strings/idea/.initial={},
+  strings/hint/.initial={},
+  strings/remark/.initial={},
+  strings/oral/.initial={},
+  strings/oral abbrev/.initial={},
+  strings/point/.initial={},
+  strings/points/.initial={},
+  strings/points abbrev/.initial={},
+  strings/bonus point/.initial={},
+  strings/bonus points/.initial={},
+  strings/bonus points abbrev/.initial={},
+  strings/optional/.initial={},
+  strings/optional abbrev/.initial={},
+  %
+  % languages: predifined string sets
+  language/.is choice,
+  language/german/.code={%
+    \exsh@deforprovide{/exsh/strings/sheet}       {\"Ubungsblatt}%
+    \exsh@deforprovide{/exsh/strings/sheets}      {\"Ubungsbl\"atter}%
+    \exsh@deforprovide{/exsh/strings/solutions}   {L\"osungsvorschl\"age}%
+    \exsh@deforprovide{/exsh/strings/solutionsby} {L\"osungen von}%
+    \exsh@deforprovide{/exsh/strings/gradingguide}{Bepunktung}%
+    \exsh@deforprovide{/exsh/strings/exercise}    {Aufgabe}%
+    \exsh@deforprovide{/exsh/strings/solution}    {L\"osung}%
+    \exsh@deforprovide{/exsh/strings/idea}        {L\"osungsidee}%
+    \exsh@deforprovide{/exsh/strings/hint}        {Hinweis}%
+    \exsh@deforprovide{/exsh/strings/remark}      {Bemerkung}%
+    \exsh@deforprovide{/exsh/strings/oral}        {m\"undlich}%
+    \exsh@deforprovide{/exsh/strings/oral abbrev} {mdl.}%
+    \exsh@deforprovide{/exsh/strings/point}       {Punkt}%
+    \exsh@deforprovide{/exsh/strings/points}      {Punkte}%
+    \exsh@deforprovide{/exsh/strings/points abbrev}{P.}%
+    \exsh@deforprovide{/exsh/strings/bonus point} {Zusatzpunkt}%
+    \exsh@deforprovide{/exsh/strings/bonus points}{Zusatzpunkte}%
+    \exsh@deforprovide{/exsh/strings/bonus points abbrev}{ZP.}%
+    \exsh@deforprovide{/exsh/strings/optional}    {optional}%
+    \exsh@deforprovide{/exsh/strings/optional abbrev} {opt.}%
+  },language/german/.value forbidden,
+  language/ngerman/.style={/exsh/language/german=#1},
+  language/english/.code={%
+    \exsh@deforprovide{/exsh/strings/sheet}       {Exercise Sheet}%
+    \exsh@deforprovide{/exsh/strings/sheets}      {Exercise Sheets}%
+    \exsh@deforprovide{/exsh/strings/solutions}   {Suggested Solutions}%
+    \exsh@deforprovide{/exsh/strings/solutionsby} {Solutions by}%
+    \exsh@deforprovide{/exsh/strings/gradingguide}{Grading guideline}%
+    \exsh@deforprovide{/exsh/strings/exercise}    {Exercise}%
+    \exsh@deforprovide{/exsh/strings/solution}    {Solution}%
+    \exsh@deforprovide{/exsh/strings/idea}        {Idea for solution}%
+    \exsh@deforprovide{/exsh/strings/hint}        {Hint}%
+    \exsh@deforprovide{/exsh/strings/remark}      {Remark}%
+    \exsh@deforprovide{/exsh/strings/oral}        {oral}%
+    \exsh@deforprovide{/exsh/strings/oral abbrev} {oral}%
+    \exsh@deforprovide{/exsh/strings/point}       {point}%
+    \exsh@deforprovide{/exsh/strings/points}      {points}%
+    \exsh@deforprovide{/exsh/strings/points abbrev}{p.}%
+    \exsh@deforprovide{/exsh/strings/bonus point} {bonus point}%
+    \exsh@deforprovide{/exsh/strings/bonus points}{bonus points}%
+    \exsh@deforprovide{/exsh/strings/bonus points abbrev}{b.p.}%
+    \exsh@deforprovide{/exsh/strings/optional}    {optional}%
+    \exsh@deforprovide{/exsh/strings/optional abbrev} {opt.}%
+  },language/english/.value forbidden,
+  language/.unknown/.code={%
+    \PackageWarning{exercisesheets-beamer}{Unknown language \pgfkeyscurrentname.
+      Defaulting to English.}{}%
+    \pgfkeys{/exsh/language=english}%
+  },
+  % 
+  % alternate strings
+  idea/.style={/exsh/strings/solution=\pgfkeysvalueof{/exsh/strings/idea}},
+  remark/.style={/exsh/strings/hint=\pgfkeysvalueof{/exsh/strings/remark}},
+  %
+  % hooks
+  every sheet/.code={},
+  every exercise/.code={},
+  every solution/.code={},
+  every hint/.code={},
+  %
+  % font specifications
+  sheet header font/.initial=\normalfont\normalsize,
+  subject font/.initial=\scshape,
+  author font/.initial=\scshape,
+  semester font/.initial={},
+  date font/.initial={},
+  solutionsby font/.initial=\itshape,
+  sheet note font/.initial=\itshape\bfseries,
+  sheet title font/.initial=\Large\bfseries,
+  exercise title font/.initial=\bfseries,
+  points font/.initial=\itshape,
+  hint font/.initial={},
+  hint title font/.initial=\itshape,
+  solution font/.initial={},
+  solution title font/.initial=\bfseries,
+  grading guide font/.initial=\itshape,
+  todo marker font/.initial=\ifdef{\color}{\color{red}}{}\bfseries,
+  %
+  % skip values
+  above sheet title skip/.initial={4ex},
+  above sheet note skip/.initial={.7ex},
+  above solutionsby skip/.initial={1ex},
+  below sheet header skip/.initial={4ex plus 1ex minus .5ex},
+  above exercise skip/.initial={3ex plus 1ex minus .5em},
+  below exercise title skip/.initial={\parskip},
+  above solution skip/.initial={1ex},
+  above hint skip/.initial={1ex},
+  %
+  % page handling
+  sheet start page action/.initial={\clearpage},
+  sheet end page action/.initial={\clearpage},
+  %
+  % conditionals
+  ifsolutions/.code 2 args={\ifsolutions{\pgfkeysalso{#1}}{\pgfkeysalso{#2}}},
+  iforalsolutions/.code 2 args={\iforalsolutions{\pgfkeysalso{#1}}{\pgfkeysalso{#2}}},
+  ifnonoralsolutions/.code 2 args={\ifnonoralsolutions{\pgfkeysalso{#1}}{\pgfkeysalso{#2}}},
+}
+
+% default values
+\pgfkeys{exsh,solutions=false,all}
+
+% process package options
+\@expandtwoargs\pgfqkeys{/exsh}{\csname opt@exercisesheets-beamer.sty\endcsname}
+
+% mark options as processed
+\expandafter\undef\csname opt@exercisesheets-beamer.sty\endcsname
+
+% allow further keys to be set
+\def\exshset#1{\pgfkeys{exsh,#1}}
+
+% automatic language selection
+\AfterEndPreamble{%
+  \exsh@provideonlytrue
+  \ifdef{\bbl@main@language}{%
+    \pgfkeys{/exsh/language=\bbl@main@language}%
+  }{%
+    \pgfkeys{/exsh/language=english}%
+  }%
+  \exsh@provideonlyfalse
+}%
+
+% range checks
+\newif\ifexsh@isinrange
+\newif\ifexsh@singularrange
+\def\exsh@checkrange#1{%
+  \edef\exsh@range@entry{#1}%
+  \def\exsh@range@curstart{}%
+  \exsh@isinrangefalse
+  \exsh@singularrangetrue
+  \pgfkeysgetvalue{/exsh/only}{\exsh@temp}%
+  \ifthenelse{\equal{-}{\exsh@temp}}{%
+    \exsh@isinrangetrue
+    \ifnumequal{\exsh@lastsheet}{1}{%
+      \exsh@singularrangetrue
+    }{%
+      \exsh@singularrangefalse
+    }%
+  }{%
+    \expandafter\exsh@range@parsestart\exsh@temp\exsh@range@end
+  }%
+}
+\def\exsh@range@parsestart#1{%
+  \ifstrequal{#1}{,}{%
+    \exsh@singularrangefalse
+    \ifdefstring{\exsh@range@curstart}{last}{%
+      \let\exsh@range@curstart\exsh@lastsheet
+    }{}%
+    \ifdefequal{\exsh@range@entry}{\exsh@range@curstart}{%
+      \exsh@isinrangetrue
+    }{}%
+    \def\exsh@range@curstart{}%
+    \exsh@range@parsestart
+  }{%
+    \ifstrequal{#1}{\exsh@range@end}{%
+      \ifdefstring{\exsh@range@curstart}{last}{%
+        \let\exsh@range@curstart\exsh@lastsheet
+      }{}%
+      \ifdefequal{\exsh@range@entry}{\exsh@range@curstart}{%
+        \exsh@isinrangetrue
+      }{}%
+    }{%
+      \ifdefequal{#1}{-}{%
+        \exsh@singularrangefalse
+        \ifdefstring{\exsh@range@curstart}{}{%
+          \def\exsh@range@curstart{0}%
+        }{}%
+        \ifdefstring{\exsh@range@curstart}{last}{%
+          \let\exsh@range@curstart\exsh@lastsheet
+        }{}%
+        \def\exsh@range@curend{}%
+        \exsh@range@parseend
+      }{%
+        \appto{\exsh@range@curstart}{#1}%
+        \exsh@range@parsestart
+      }%
+    }%
+  }%
+}
+\def\exsh@range@parseend#1{%
+  \ifstrequal{#1}{,}{%
+    \ifdefstring{\exsh@range@curend}{last}{%
+      \def\exsh@range@curend{10000}%
+    }{}%
+    \ifdefstring{\exsh@range@curend}{}{
+      \def\exsh@range@curend{10000}%
+    }{}%
+    \ifthenelse{\NOT \(\exsh@range@curstart > \exsh@range@entry
+      \OR \exsh@range@entry > \exsh@range@curend\)}{%
+      \exsh@isinrangetrue
+    }{}%
+    \def\exsh@range@curstart{}%
+    \exsh@range@parsestart
+  }{%
+    \ifstrequal{#1}{\exsh@range@end}{%
+      \ifdefstring{\exsh@range@curend}{last}{%
+        \def\exsh@range@curend{10000}%
+      }{}%
+      \ifdefstring{\exsh@range@curend}{}{
+        \def\exsh@range@curend{10000}%
+      }{}%
+      \ifthenelse{\NOT \(\exsh@range@curstart > \exsh@range@entry
+        \OR \exsh@range@entry > \exsh@range@curend\)}{%
+        \exsh@isinrangetrue
+      }{%
+      }%      
+    }{%
+      \appto{\exsh@range@curend}{#1}%
+      \exsh@range@parseend
+    }%
+  }%
+}
+
+% remember last sheet (for range checks)
+\def\exsh@lastsheet{0}% to be overridden in aux file
+\AtEndDocument{%
+  \immediate\write\@auxout{\string\gdef\string\exsh@lastsheet{\arabic{part}}}%
+}
+
+\numberwithin{page}{part}
+\renewcommand{\thepage}{\arabic{page}}%changed for every sheet
+\setcounter{secnumdepth}{-1}
+
+\AfterPackage*{hyperref}{%
+  % make PDF destinations unique:
+  \def\theHsection{\arabic{sheetid}.\arabic{section}}%
+  \def\theHpage{\arabic{sheetid}-\arabic{page}}%
+  %
+  % open bookmarks when typesetting a single sheet
+  \AtEndPreamble{%
+    \exsh@checkrange{0}%
+    \ifexsh@singularrange\hypersetup{bookmarksopen}\fi
+  }%
+}
+
+% automatic title selection
+\let\exsh@title\relax
+\let\exsh@title@new\relax
+\def\exsh@write@title#1{%
+  \xdef\exsh@title@new{\expandonce #1}%
+  \protected@write\@auxout{}{\string\gdef\string\exsh@title{\expandonce\exsh@title@new}}%
+}
+\AfterEndDocument{%
+  \ifthenelse{\equal{\exsh@title}{\exsh@title@new}}{}{%
+    \@latex@warning@no@line{Label(s) may have changed.
+      Rerun to get cross-references right}%
+  }%
+}
+\AfterEndPreamble{%
+  \exsh@checkrange{0}%
+  \ifexsh@singularrange\else
+    \pgfkeysgetvalue{/exsh/strings/sheets}{\exsh@tmp}%
+    \exsh@write@title{\exsh@tmp}%
+  \fi
+}
+
+\AtBeginDocument{%
+  \ifexsh@solutions
+    \title{\exsh@title: \pgfkeysvalueof{/exsh/strings/solutions}}%
+  \else
+    \title{\exsh@title}
+  \fi
+}
+\newcounter{sheetid}% only used to disambiguate hyperref labels
+\newenvironment{sheet}[1][]{%
+  \pgfkeys{exsh,every sheet,#1}%
+  \pgfkeysvalueof{/exsh/sheet start page action}%
+  \stepcounter{sheetid}%
+  \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/title}}}{%
+    \numdef\exsh@tmp{\value{part}+1}%
+    \edef\exsh@temp{\expandonce{\pgfkeysvalueof{/exsh/strings/sheet}}\noexpand~\exsh@tmp}%
+    \pgfkeys{/exsh/title/.expand once={\exsh@temp}}%
+    \def\thepage{\arabic{part}-\arabic{page}}%
+  }{%
+    \def\thepage{\arabic{page}}%
+    \setcounter{section}{0}%
+  }%
+  \numdef\exsh@tmp{\value{part}+1}%
+  \exsh@checkrange{\exsh@tmp}%
+  \ifexsh@isinrange
+    \ifexsh@singularrange
+      \pgfkeysgetvalue{/exsh/title}{\exsh@temp}%
+      \exsh@write@title{\exsh@temp}%
+    \fi
+    \exsh@sheethead
+  \else
+    \refstepcounter{part}%
+    \def\exsh@skipwhat{sheet}\expandafter\exsh@skipstuff
+  \fi
+}{%
+  \par
+  \begingroup
+  \ifnum\value{page}=1\thispagestyle{empty}\fi
+  \pgfkeysvalueof{/exsh/sheet end page action}%
+  \endgroup
+}
+\listadd{\exsh@enums}{enumerate}
+\listadd{\exsh@enums}{compactenum}
+\listadd{\exsh@enums}{asparaenum}
+\listadd{\exsh@enums}{inparaenum}
+\listadd{\exsh@nonenums}{itemize}
+\listadd{\exsh@nonenums}{compactitem}
+\listadd{\exsh@nonenums}{asparaitem}
+\listadd{\exsh@nonenums}{inparaitem}
+\listadd{\exsh@nonenums}{description}
+\listadd{\exsh@nonenums}{compactdesc}
+\listadd{\exsh@nonenums}{asparadesc}
+\listadd{\exsh@nonenums}{inparadesc}
+\listadd{\exsh@nonenums}{asparablank}
+\listadd{\exsh@nonenums}{inparablank}
+\listadd{\exsh@nonenums}{list}
+\long\def\exsh@skipstuff#1{%
+  \ifstrequal{#1}{\begin}{\exsh@skipstuff@begin}{%
+    \ifstrequal{#1}{\end}{\exsh@skipstuff@end}{%
+      \ifstrequal{#1}{\label}{\exsh@skipstuff@label}{%
+        \ifstrequal{#1}{\input}{\exsh@skipstuff@input}{%
+          \ifstrequal{#1}{\exsh@skipstuff@endfile}{\currfile@pop\exsh@skipstuff}{%
+            \ifstrequal{#1}{\setcounter}{\expandafter\exsh@skipstuff\setcounter}{%
+              \ifstrequal{#1}{\item}{\ifdef{\@enumctr}{%\@hyper@itemtrue%
+              \refstepcounter{\@enumctr}}{}}{}%
+              \pgfkeysvalueof{/exsh/custom skip macro}{#1}}}}}}}%
+}
+\let\exshskipcontinue\exsh@skipstuff
+\long\def\exsh@skipcustomstuff#1{\exshskipcontinue}
+\def\exsh@skipstuff@end#1{%
+  \expandafter\ifstrequal\expandafter{\exsh@skipwhat}{#1}{%
+    \expandafter\end\expandafter{\exsh@skipwhat}%
+    \let\exsh@skipwhat\relax%
+  }{
+    \endgroup\exsh@skipstuff%
+  }%
+}
+\def\exsh@skipstuff@begin#1{%
+  \begingroup
+  \ifstrequal{#1}{exercise}{\refstepcounter{section}%
+    % automatic label for the first exercise in every included file
+    \ifthenelse{\equal{\jobname}{\currfilebase}}{}{%
+      \ifcsdef{exsh@autolabel@\currfilebase}{}{%
+        \csdef{exsh@autolabel@\currfilebase}{}%
+        \label{ex:\currfilebase}}}%
+  }{}%
+  \ifinlist{#1}{\exsh@enums}{%
+    \exsh@skipstuff@beginenum
+  }{%
+    \ifinlist{#1}{\exsh@nonenums}{%
+      \undef\@enumctr
+    }{}%
+    \exsh@skipstuff
+  }%
+}
+\def\exsh@skipstuff@beginenum{%
+  \ifnum\@enumdepth>\thr@@
+    \@toodeep
+  \else
+    \advance\@enumdepth\@ne
+    \edef\@enumctr{enum\romannumeral\the\@enumdepth}%
+    \setcounter{\@enumctr}{0}%
+  \fi
+  \@ifundefined{@enumlabel@}{%
+    \exsh@skipstuff
+  }{%
+    \@ifnextchar[{\@enumlabel@{\exsh@skipstuff}[}{\exsh@skipstuff}%
+  }%
+}
+\def\exsh@skipstuff@label#1{%
+  % Locally modify \protected@write to use \immediate\write instead.
+  % This is needed to include labels after the last shipout in the aux file.
+  \begingroup
+  \def\protected@write##1##2##3{%
+    \begingroup
+    \let\protect\@unexpandable@protect
+    \immediate\write##1{##3}%
+    \endgroup
+  }%
+  \label{#1}%
+  \endgroup
+  \exsh@skipstuff
+}
+\def\exsh@skipstuff@input#1{%
+  \CatchFileDef{\exsh@inputfilecontent}{#1}{}%
+  \currfile@push
+  \currfile@set{#1}%
+  \expandafter\exsh@skipstuff\exsh@inputfilecontent\exsh@skipstuff@endfile
+}
+
+\long\def\exsh@sheethead{%
+  \pgfkeysgetvalue{/exsh/title}{\exsh@tmp}%
+  \ifexsh@solutions
+    \expandafter\edef\expandafter\exsh@tmp{\expandonce\exsh@tmp:\noexpand~\pgfkeysvalueof{/exsh/strings/solutions}}%
+  \fi
+  \refstepcounter{part}%
+  \begin{frame}
+  \begin{block}{}
+    \centering\Large\exsh@tmp
+  \end{block}
+    \begingroup
+      \pgfkeysvalueof{/exsh/sheet header font}%
+      \ifexsh@solutions%
+        \ifdefvoid{\exsh@solutionsby}{}{%
+          \begingroup
+            \begin{block}{}
+              \pgfkeysvalueof{/exsh/solutionsby font}%
+              \vskip\pgfkeysvalueof{/exsh/above solutionsby skip}%
+              \relax%
+              \pgfkeysvalueof{/exsh/strings/solutionsby}%
+              ~\exsh@solutionsby\\\unskip%
+            \end{block}%
+          \endgroup
+        }%
+      \else
+      \fi
+      \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/note}}}{%
+      }{%
+        \ifbool{exsh@samplesolutions}{}{%
+          \begingroup
+            \begin{block}{}
+              \pgfkeysvalueof{/exsh/sheet note font}%
+              \vskip\pgfkeysvalueof{/exsh/above sheet note skip}\relax
+              \pgfkeysvalueof{/exsh/note}\\\unskip%
+            \end{block}%
+          \endgroup
+        }%
+      }%
+    \endgroup
+%   \stepcounter{page}%
+  \end{frame}
+}
+
+\ifdef{\othersectionslevelsformat}{%
+  \renewcommand{\othersectionlevelsformat}[1]{%
+    \ifstrequal{#1}{section}%
+    {}%
+    {\csname the#1\endcsname\autodot\enskip}}%
+}{}
+
+\newenvironment*{exercise}[1][]{%
+  % TODO: \edef is not safe with luatex and umlauts, only fixed for "oral" for now
+  \pgfkeys{exsh,every exercise,#1}%
+  \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/points}}}{%
+    \def\exsh@points{}%
+    \def\exsh@shortpoints{}%
+  }{%
+    \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/points}}}{%
+      \edef\exsh@points{\pgfkeysvalueof{/exsh/pointsinfo}}%
+    }{%
+      \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+        \ifexsh@abbrev%
+          \pgfkeysgetvalue{/exsh/strings/oral abbrev}{\exsh@points}%
+        \else%
+          \pgfkeysgetvalue{/exsh/strings/oral}{\exsh@points}%
+        \fi%
+      }{%
+         \ifexsh@abbrev%
+            \ifexsh@bonus%
+              \edef\exsh@points{\pgfkeysvalueof{/exsh/points} \pgfkeysvalueof{/exsh/strings/bonus points abbrev}}%
+            \else%
+              \edef\exsh@points{\pgfkeysvalueof{/exsh/points} \pgfkeysvalueof{/exsh/strings/points abbrev}}%
+            \fi%
+         \else%
+          \ifthenelse{\equal{1}{\pgfkeysvalueof{/exsh/points}}}{%
+            \ifexsh@bonus%
+              \edef\exsh@points{1 \pgfkeysvalueof{/exsh/strings/bonus point}}%
+            \else%
+              \edef\exsh@points{1 \pgfkeysvalueof{/exsh/strings/point}}%
+            \fi%
+          }{%
+            \ifexsh@bonus%
+              \edef\exsh@points{\pgfkeysvalueof{/exsh/points} \pgfkeysvalueof{/exsh/strings/bonus points}}%
+            \else%
+              \edef\exsh@points{\pgfkeysvalueof{/exsh/points} \pgfkeysvalueof{/exsh/strings/points}}%
+            \fi%
+           }%
+         \fi%
+       }%
+      \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/pointsinfo}}}{}{%
+        \edef\exsh@points{\expandonce\exsh@points, \pgfkeysvalueof{/exsh/pointsinfo}}%
+      }%
+    }%
+    \ifthenelse{\equal{}{\exsh@points}}{%
+      \def\exsh@shortpoints{}%
+    }{%
+      \edef\exsh@shortpoints{ (\expandonce\exsh@points)}%
+    }%
+    \preto\exsh@points{\enskip\hfill\bgroup%
+      \pgfkeysvalueof{/exsh/points font}}%
+    \appto\exsh@points{\egroup}%
+  }%
+  \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/firstline}}}{%
+    \def\exsh@firstline{}%
+  }{%
+    \def\exsh@firstline{\pgfkeysvalueof{/exsh/firstline}}%
+    \preto\exsh@firstline{\quad\bgroup\normalfont\normalsize}%
+    \appto\exsh@firstline{\egroup}%
+  }%
+  \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/name}}}{%
+    \def\exsh@exname{}%
+    \def\exsh@shortexname{}%
+  }{%
+    \edef\exsh@exname{\space(\pgfkeysvalueof{/exsh/name})}%
+    \edef\exsh@shortexname{:\space\pgfkeysvalueof{/exsh/name}}%
+  }%
+  \refstepcounter{section}%
+  \edef\exsh@tmp{[\pgfkeysvalueof{/exsh/strings/exercise} \arabic{section}\exsh@shortexname\expandonce\exsh@shortpoints]}%
+  \ifbool{exsh@samplesolutions}{\ifbool{exsh@sample}{\exsh@hidefalse}{\exsh@hidetrue}}{\exsh@hidefalse}%
+  \ifbool{exsh@hide}{%
+    \def\exsh@skipwhat{exercise}\expandafter\exsh@skipstuff%
+  }{%
+    \expandafter\exsh@startsection\exsh@tmp{\noindent%
+      \hbox to 0pt{\hss\pgfkeysvalueof{/exsh/exercisemark}}%
+      \pgfkeysvalueof{/exsh/strings/exercise}~\arabic{section}\exsh@exname\exsh@firstline\expandonce\exsh@points}%
+    \unskip\vskip\pgfkeysvalueof{/exsh/below exercise title skip}\relax
+    \@afterindentfalse
+    % automatic label for the first exercise in every included file
+    \ifthenelse{\equal{\jobname}{\currfilebase}}{}{%
+      \ifcsdef{exsh@autolabel@\currfilebase}{}{%
+        \csdef{exsh@autolabel@\currfilebase}{}%
+        \label{ex:\currfilebase}}}%
+    % Use \leavevmode to ensure proper distances above environments that start
+    % with a new \par. Make sure that a \label does not mess up the layout.
+    \@ifnextchar\label{\exsh@label}{\leavevmode\ignorespaces}%
+  }%
+}{
+  \clearpage%
+}
+\newcommand{\exsh@label}[2]{#1{#2}\leavevmode\ignorespaces}
+\newcommand{\exsh@startsection}[2][]{%
+   \newpage
+%   \begin{block}{}
+%   \pgfkeysvalueof{/exsh/exercise title font}{#2}%
+%   \end{block}
+  \begingroup
+  \usebeamercolor{block title}
+  \setbeamercolor{block body}{bg=bg,fg=fg}
+  \block{}{\pgfkeysvalueof{/exsh/exercise title font}{#2}}\endblock
+  \endgroup
+}%
+
+\AfterPackage*{varioref}{
+  \labelformat{section}{\pgfkeysvalueof{/exsh/strings/exercise}~\arabic{section}}
+  \labelformat{enumi}{\arabic{section}.\alph{enumi}}
+}
+\AfterPackage*{paralist}{
+  \setdefaultenum{(a)}{(1)}{i.}{A.}
+}
+\AfterPackage*{enumitem}{
+  \setenumerate[1]{label=(\alph*)}
+  \setenumerate[2]{label=(\arabic*)}
+  \setenumerate[3]{label=\roman*.}
+  \setenumerate[4]{label=\Alph.}
+  \setlist[enumerate,1]{label=(\alph*),after*=\setcounter{enumi}{0}}
+}
+\def\theHenumi{enumi.\arabic{part}.\arabic{section}.\arabic{enumi}}
+
+% reset equation numbering for each exercise
+\@addtoreset{equation}{section}
+
+\newenvironment{hint}[1][]{%
+  \par
+  \pgfkeys{exsh,every hint,#1,hint font}%
+  \vskip\pgfkeysvalueof{/exsh/above hint skip}\relax\noindent
+  {\pgfkeysvalueof{/exsh/hint title font}\pgfkeysvalueof{/exsh/strings/hint}:}~\ignorespaces
+}{%
+  \par
+}
+\newenvironment{hint*}[1][]{%
+  \pgfkeys{exsh,every hint,#1,hint font}%
+  ({\pgfkeysvalueof{/exsh/hint title font}\pgfkeysvalueof{/exsh/strings/hint}:}\space%
+}{%
+  \unskip)%
+}
+\providecommand{\solution}{}
+\renewenvironment{solution}[1][]{%
+  \pgfkeys{exsh,every solution,#1,solution font}%
+  \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+    \ifbool{exsh@oralsolutions}{%
+      \let\next\exsh@startsolution
+    }{%
+      \let\next\exsh@skipsolution
+    }%
+  }{%
+    \ifbool{exsh@nonoralsolutions}{%
+      \let\next\exsh@startsolution
+    }{%
+      \let\next\exsh@skipsolution
+    }%
+  }%
+  \ifbool{exsh@forcesample}{%
+    \ifbool{exsh@samplesolutions}{%
+      \let\next\exsh@startsolution
+    }{}%
+  }{}%
+  \ifbool{exsh@beamersolution}{%
+    \let\next\exsh@skipsolution
+  }{}%
+  \next
+}{%
+%   \ifnum\value{enumi}=0
+  \ifbool{exsh@beamersolution}{}{%
+    \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+      \ifbool{exsh@oralsolutions}{\clearpage}{}%
+    }{%
+      \ifbool{exsh@nonoralsolutions}{\clearpage}{}%
+    }%
+  }%
+%   \fi
+}
+
+\def\exsh@startsolution{%
+  \ifnum\value{enumi}=0%
+  \clearpage
+  \fi
+  \begingroup
+  \usebeamercolor{block title alerted}
+  \setbeamercolor{block body}{bg=bg,fg=fg}
+  \block{}
+    \pgfkeysvalueof{/exsh/solution title font}%
+    \pgfkeysvalueof{/exsh/strings/solution} %
+    (\pgfkeysvalueof{/exsh/strings/exercise} \arabic{section}%
+    \alph{enumi})%
+  \endblock
+  \endgroup
+  \@afterheading
+}%
+
+\long\def\exsh@skipsolution#1{%
+  \ifstrequal{#1}{\end}{\exsh@endsolution}{\exsh@skipsolution}%
+}
+\def\exsh@endsolution#1{%
+  \ifstrequal{#1}{solution}{
+    \end{solution}
+  }{%
+    \ifstrequal{#1}{beamersolution}{
+      \end{beamersolution}
+    }{%
+      \exsh@skipsolution}%
+  }%
+}
+
+\newenvironment<>{beamersolution}[1][]{%
+  \pgfkeys{exsh,every solution,#1,solution font}%
+  \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+    \ifbool{exsh@oralsolutions}{%
+      \let\next\exsh@startsolution
+    }{%
+      \let\next\exsh@skipsolution
+    }%
+  }{%
+    \ifbool{exsh@nonoralsolutions}{%
+      \let\next\exsh@startsolution
+    }{%
+      \let\next\exsh@skipsolution
+    }%
+  }%
+  \ifbool{exsh@forcesample}{%
+    \ifbool{exsh@samplesolutions}{%
+      \let\next\exsh@startsolution
+    }{}%
+  }{}%
+  \next
+}{%
+  \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+    \ifbool{exsh@oralsolutions}{\clearpage}{}%
+  }{%
+    \ifbool{exsh@nonoralsolutions}{\clearpage}{}%
+  }%
+}
+
+
+\newcommand{\pun}[1][]{%
+  \PackageWarning{exercisesheets}{Obsolete \string\pun[] macro used. Please use
+    something\MessageBreak like \string\points{10} or \string\points{oral} instead.}{}%
+  \exsh@subexpoints{#1}%
+}
+\newcommand{\points}[2][]{%
+  \ifthenelse{\equal{}{#2}}{}{\exshset{points=#2}}%
+  \bgroup%
+  \exshset{#1}%
+  \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/pointsinfo}}}{%
+    \def\exsh@tmp{}%
+  }{%
+    \def\exsh@tmp{, \pgfkeysvalueof{/exsh/pointsinfo}}%
+  }%
+  \ifthenelse{\equal{#2}{oral}}{%
+    \ifexsh@abbrev%
+      \exsh@subexpoints{\pgfkeysvalueof{/exsh/strings/oral abbrev}\exsh@tmp}%
+    \else%
+      \exsh@subexpoints{\pgfkeysvalueof{/exsh/strings/oral}\exsh@tmp}%
+    \fi%
+  }{%
+    \ifthenelse{\equal{#2}{}}{%
+      \exsh@subexpoints{\pgfkeysvalueof{/exsh/pointsinfo}}%
+    }{%
+      \ifexsh@abbrev%
+          \ifexsh@bonus%
+            \exsh@subexpoints{#2~\pgfkeysvalueof{/exsh/strings/bonus points abbrev}\exsh@tmp}%
+          \else%
+            \exsh@subexpoints{#2~\pgfkeysvalueof{/exsh/strings/points abbrev}\exsh@tmp}%
+          \fi%
+      \else%
+        \ifthenelse{\equal{#2}{1}}{%
+          \ifexsh@bonus%
+            \exsh@subexpoints{1~\pgfkeysvalueof{/exsh/strings/bonus point}\exsh@tmp}%
+          \else%
+            \exsh@subexpoints{1~\pgfkeysvalueof{/exsh/strings/point}\exsh@tmp}%
+          \fi%
+        }{%
+          \ifexsh@bonus%
+            \exsh@subexpoints{#2~\pgfkeysvalueof{/exsh/strings/bonus points}\exsh@tmp}%
+          \else%
+            \exsh@subexpoints{#2~\pgfkeysvalueof{/exsh/strings/points}\exsh@tmp}%
+          \fi%
+        }%
+      \fi
+    }%
+  }%
+  \egroup
+  \ignorespaces
+}
+
+\newenvironment{gradingguide}[1][]{%
+  \pgfkeys{exsh,#1,grading guide font}%
+  \ifbool{exsh@gradingguides}{%
+    \let\next\exsh@startguide
+  }{%
+    \let\next\exsh@skipguide
+  }%
+  \next
+}{}
+
+\def\exsh@startguide{\@afterindentfalse%
+  \par
+  {\parindent \z@
+    \pgfkeysvalueof{/exsh/strings/gradingguide}: }\nobreak%
+  \@afterheading
+}%
+
+\long\def\exsh@skipguide#1{%
+  \ifstrequal{#1}{\end}{\exsh@endguide}{\exsh@skipguide}%
+}
+\def\exsh@endguide#1{%
+  \ifstrequal{#1}{gradingguide}{\end{gradingguide}}{\exsh@skipguide}%
+}
+
+
+\ifluatex%
+  \ifdefined\luatextextdir
+    \def\exsh@putatend#1{%
+      \leavevmode\luatextextdir TRT\unskip{\luatextextdir TLT{\hfill~~#1}}\luatextextdir TLT}%
+  \else
+    \def\exsh@putatend#1{%
+      \leavevmode\textdir TRT\unskip{\textdir TLT{\hfill~~#1}}\textdir TLT}%
+  \fi
+\else%
+  \def\exsh@putatend#1{%
+    \TeXXeTstate=1%
+    \beginR\unskip{\beginL~~#1\endL}\hfill\beginL\TeXXeTstate=0}%
+\fi
+
+\def\exsh@leaveinplace#1{\unskip~{#1} }
+\def\exsh@insertFill#1{\unskip\nobreak\space\nobreak\hspace*{\fill}\allowbreak\hspace*{\fill}{#1}\unskip}
+
+\newcommand{\exsh@subexpoints}[1]{%
+   \ifexsh@inplace%
+     \exsh@leaveinplace{\pgfkeysvalueof{/exsh/points font}\mbox{(#1)}}%
+   \else%
+     \ifexsh@pointsfloatright% can be used directly after \item etc.
+       \exsh@putatend{\pgfkeysvalueof{/exsh/points font}\mbox{(#1)}}%
+     \else% original points macro with fill
+       \exsh@insertFill{\pgfkeysvalueof{/exsh/points font}\mbox{(#1)}}%
+     \fi%
+   \fi%
+}
+
+\newcommand{\TODO}{%
+  \ifmmode
+    ${\pgfkeysvalueof{/exsh/todo marker font}TODO}$%
+  \else
+    {\pgfkeysvalueof{/exsh/todo marker font}TODO}%
+  \fi
+  \PackageWarning{exercisesheets}{TODO marker found}%
+}
+
+\newcommand{\ifsolutions}[2]{%
+  \ifbool{exsh@solutions}{#1}{#2}%
+}
+
+\newcommand{\iforalsolutions}[2]{%
+  \ifbool{exsh@oralsolutions}{#1}{#2}%
+}
+\newcommand{\ifnonoralsolutions}[2]{%
+  \ifbool{exsh@nonoralsolutions}{#1}{#2}%
+}
+\newcommand{\ifsamplesolutions}[2]{%
+  \ifbool{exsh@samplesolutions}{#1}{#2}%
+}
+\newcommand{\samplehide}[1]{%
+  \ifbool{exsh@samplesolutions}{}{#1}%
+}
+
+
+
+\setbeamertemplate{headline}{%
+\leavevmode%
+  \begin{beamercolorbox}[wd=\paperwidth,ht=3.5em,dp=1.375ex]%
+  {frametitle}\footnotesize
+      \hspace*{2ex}{\pgfkeysvalueof{/exsh/subject font}\pgfkeysvalueof{/exsh/subject}} \hfill
+    {\pgfkeysvalueof{/exsh/semester font}\pgfkeysvalueof{/exsh/semester}}\hspace{2ex}\hfil\linebreak
+    \hspace*{2ex}{\pgfkeysvalueof{/exsh/author font}\exsh@author}\hfill
+    {\pgfkeysvalueof{/exsh/date font}\pgfkeysvalueof{/exsh/date}}%
+    \hspace{2ex}\hfil\linebreak\vspace{-1em}
+  \end{beamercolorbox}%
+  \vspace{3mm}
+}
+
+\setbeamertemplate{footline}
+{%
+  \leavevmode%
+  \hbox{\begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm]{frametitle}%
+  {\pgfkeysvalueof{/exsh/author font}\pgfkeysvalueof{/exsh/exauthor}}
+  \end{beamercolorbox}%
+  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm plus1fil]{author in head/foot}%
+    \usebeamerfont{author in head/foot}
+    \inserttitle
+    \hfill\insertpagenumber
+  \end{beamercolorbox}}%
+  \vskip0pt%
+}