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+%% exercisesheets.sty
+%% Copyright 2008-2023 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 Frank Fuhlbrück.
+%
+% 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{0.17}
+\def\exsh@date{2024/04/23}
+
+\ProvidesPackage{exercisesheets}[\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{environ}
+
+\RequirePackage{pgfkeys}
+\RequirePackage{keyval}
+\RequirePackage{kvoptions}
+
+\RequirePackage{ifthen}
+\RequirePackage{ifluatex}
+
+\RequirePackage{amsmath}
+
+\RequirePackage{currfile}
+\RequirePackage{catchfile}
+
+%we need getrefnumber
+\RequirePackage{refcount}
+
+% configuration keys
+
+\newif\ifexsh@beamer
+\@ifclassloaded{beamer}{\exsh@beamertrue}{}
+\newif\ifexsh@html
+\@ifclassloaded{tex4ht}{\exsh@htmltrue}{}
+\ifdefined\HCode
+ \exsh@htmltrue
+\fi
+\ifexsh@html
+ \def\exsh@inshtml#1{\HCode{#1}}
+\else
+ \def\exsh@inshtml#1{}
+\fi
+
+\newif\ifexsh@patchenumerate\exsh@patchenumeratetrue
+\newif\ifexsh@settitle\exsh@settitletrue
+\newif\ifexsh@patchpagenumbers\exsh@patchpagenumberstrue
+\newif\ifexsh@patchheadandfoot\exsh@patchheadandfoottrue
+\newif\ifexsh@usestartsection\exsh@usestartsectiontrue
+\newif\ifexsh@firstexonsheet
+\def\exsh@firstexonsheettrue{\global\let\ifexsh@firstexonsheet\iftrue}
+\def\exsh@firstexonsheetfalse{\global\let\ifexsh@firstexonsheet\iffalse}
+\newif\ifexsh@savetasks
+\newif\ifexsh@solutions
+\newif\ifexsh@oralsolutions
+\newif\ifexsh@nonoralsolutions
+\newif\ifexsh@samplesolutions
+\newif\ifexsh@exnumsheet
+\newif\ifexsh@forcesample %force printing sample sol. of wrong type
+%For beamer only
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\ifexsh@beamer
+\newif\ifexsh@beamerwithheadline
+\newif\ifexsh@beamerwithfootline
+\newif\ifexsh@beameruseblocks
+\newif\ifexsh@defersolutiontitle
+\newif\ifexsh@headerrestate
+\newif\ifexsh@framed
+\newif\ifexsh@fragile
+\fi
+%Also only true for beamer, but we want to use it elsewhere
+\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
+\newif\ifexsh@sumuppoints
+\newif\ifexsh@filenameasexercisename
+\newif\ifexsh@showtodos
+\newif\ifexsh@beamercompatdone
+
+\def\exsh@beamercompatibility{
+\ifexsh@beamercompatdone
+ \PackageError{exercisesheets}{
+ beamercompatibility used twice}{}%
+\else
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+ %currently we do nothing if beamer is loaded,
+ %but this might change
+\else%--------- NON-BEAMER: ---------------------------------------
+ \let\pause\relax
+ \def\frame{}
+ \renewcommand{\frame}[1][]{}
+ \let\endframe\relax
+ \def\onslide<##1>{}
+ \def\only<##1>##2{##2}
+ \def\uncover<##1>##2{##2}
+ \def\visible<##1>##2{##2}
+ \def\invisible<##1>##2{##2}
+ \long\def\alt<##1>##2##3{##2}
+ \long\def\temporal<##1>##2##3##4{##3}
+ \let\exsh@origitem\item
+ \def\exsh@ovrlitem<##1>{\exsh@origitem}
+ \def\item{\@ifnextchar<\exsh@ovrlitem\exsh@origitem}
+ \let\exsh@origitemize\itemize
+ \def\exsh@ovrlitemize[##1]{\exsh@origitemize}
+ \def\itemize{\@ifnextchar[\exsh@ovrlitemize\exsh@origitemize}
+ \let\exsh@origenumerate\enumerate
+ \def\exsh@ovrlenumerate[##1]{\exsh@origenumerate}
+ \def\enumerate{\@ifnextchar[\exsh@ovrlenumerate\exsh@origenumerate}
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ \exsh@beamercompatdonetrue
+\fi
+}
+
+\pgfkeys{/exsh/.is family,/exsh,
+ patchenumerate/.is if=exsh@patchenumerate,
+ patchenumerate/.default=true,
+ settitle/.is if=exsh@settitle,
+ settitle/.default=true,
+ patchpagenumbers/.is if=exsh@patchpagenumbers,
+ patchpagenumbers/.default=true,
+ usestartsection/.is if=exsh@usestartsection,
+ usestartsection/.default=true,
+ embedded/.code={%
+ \exsh@patchenumeratefalse
+ \exsh@settitlefalse
+ \exsh@patchpagenumbersfalse
+ \exsh@patchheadandfootfalse
+ \exsh@usestartsectionfalse
+ \pgfkeysalso{secnumdepth=keep}%
+ \def\exhs@sheetnoheader[##1]##2{}%
+ \newcounter{exshsheet}
+ \newcounter{exshexercise}
+ \pgfkeysalso{
+ sheet sectioning cmd=\exhs@sheetnoheader,
+ sheet counter=exshsheet,
+ exercise counter=exshexercise,
+ sheet start page action=\relax,
+ sheet end page action=\relax,
+ }%
+ },
+ minskips/.code={%
+ \pgfkeysalso{
+ above sheet title skip=0pt,
+ below sheet header skip=0pt,
+ above first exercise skip=0pt,
+ below exercise title skip=0pt,
+ }%
+ },
+ savetasks/.is if=exsh@savetasks,
+ savetasks/.default=true,
+ 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,
+ number within sheet/.is if=exsh@exnumsheet,
+ number within sheet/.default=true,
+ forcesample/.is if=exsh@forcesample,
+ forcesample/.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,
+ exercisespath/.code={\def\exsh@exercisespath{#1}},
+ exercisespath/.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,
+ showtodos/.is if=exsh@showtodos,
+ showtodos/.default=true,
+ filenameasexercisename/.is if=exsh@filenameasexercisename,
+ filenameasexercisename/.default=true,
+ pointsfloatright/.is if=exsh@pointsfloatright,
+ pointsfloatright/.default=true,
+ abbrev/.is if=exsh@abbrev,
+ abbrev/.default=true,
+ beamercompatibility/.default={ignore},
+ beamercompatibility/.initial={ignore},
+ beamercompatibility/.code={\exsh@beamercompatibility}
+}
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\pgfkeys{exsh,
+ beamerwithheadline/.is if=exsh@beamerwithheadline,
+ beamerwithheadline/.default=true,
+ beamerwithfootline/.is if=exsh@beamerwithfootline,
+ beamerwithfootline/.default=true,
+ beameruseblocks/.is if=exsh@beameruseblocks,
+ beameruseblocks/.default=true,
+ beamersolution/.is if=exsh@beamersolution,
+ beamersolution/.default=true,
+ defersolutiontitle/.is if=exsh@defersolutiontitle,
+ defersolutiontitle/.default=true,
+ headerrestate/.is if=exsh@headerrestate,
+ headerrestate/.default=true,
+ framed/.is if=exsh@framed,
+ framed/.default=true,
+ fragile/.is if=exsh@fragile,
+ fragile/.default=true,
+ beamersolution/.initial={false},
+ beamerwithheadline/.initial={false},
+ beamerwithfootline/.initial={false},
+ beameruseblocks/.initial={false},
+ defersolutiontitle/.initial={false},
+ headerrestate/.initial={false},
+ framed/.initial={false},
+}
+\else%--------- NON-BEAMER: ---------------------------------------
+\pgfkeys{exsh,
+ beamerwithheadline/.default={ignore},
+ beamerwithheadline/.initial={ignore},
+ beamerwithfootline/.default={ignore},
+ beamerwithfootline/.initial={ignore},
+ beamersolution/.default={ignore},
+ beamersolution/.initial={ignore},
+ defersolutiontitle/.default={ignore},
+ defersolutiontitle/.initial={ignore},
+ headerrestate/.default={ignore},
+ headerrestate/.initial={ignore},
+ framed/.default={ignore},
+ framed/.initial={ignore},
+ framed/.code={\let\newframe\relax},
+ fragile/.default={ignore},
+ fragile/.initial={ignore},
+}
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% store title data for sheet headers
+\ifundef\subject{% \subject is only provided by KOMA classes
+ \newcommand{\subject}[1]{}%
+ \def\@subject{}%
+}{}
+% beamer has subject, but not \@subject:
+\providecommand{\@subject}{}
+\apptocmd{\subject}{\pgfkeys{/exsh/subject={#1}}}{}{}%
+\ifdefempty{\@subject}{
+ \pgfkeys{exsh,subject/.initial={\PackageWarning{exercisesheets}{No \string\subject\space given}}}
+}{
+ \pgfkeys{/exsh/subject/.initial/.expand once=\@subject}
+}
+\ifdefstring{\@date}{\today}{
+ \pgfkeys{/exsh/semester/.initial={\PackageWarning{exercisesheets}{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,
+ %general package options
+ patchenumerate/.initial=true,
+ settitle/.initial=true,
+ patchpagenumbers/.initial=true,
+ custom skip macro/.initial=\exsh@skipcustomstuff,
+ showtodos/.initial={false},
+ hidetodos/.style={/exsh/showtodos=false},
+ hidetodos/.value forbidden,
+ % additional sheet info
+ title/.initial={},
+ date/.initial={},
+ note/.initial={},
+ exauthor/.initial={\exsh@author},
+ number within sheet/.initial={false},
+ %
+ % additional exercise info
+ name/.initial={},
+ forcesample/.initial={false},
+ firstline/.initial={},
+ points/.initial={},
+ oral/.style={/exsh/points=oral},oral/.value forbidden,
+ inplace/.initial={false},
+ sample/.initial={false},
+ filenameasexercisename/.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,
+ savetasks/.initial=false,
+}
+\pgfkeys{exsh,
+ %
+ % 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}{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={},
+ %
+ % sectioning cmds and counters for sheet and exercise
+ % sheet sectioning cmd must take an optional
+ % and a mandatory argument
+ sheet sectioning cmd/.initial={\part},
+ sheet counter/.initial={part},
+ secnumdepth/.initial={-1},
+ exercise counter/.initial={section},
+ %
+ % 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,
+ main task font/.initial={},
+ subtask font/.initial={},
+ task restate font/.initial=\itshape,
+ hint font/.initial={},
+ hint title font/.initial=\itshape,
+ solution font/.initial={},
+ solution title font/.initial=\bfseries,
+ solution title separator/.initial={:\par},
+ grading guide font/.initial=\itshape,
+ todo marker font/.initial=\ifdef{\color}{\color{red}}{}\bfseries,
+ %
+ % skip values
+ below slide headline skip/.initial={0mm},
+ 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},
+ above first 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.sty\endcsname}
+
+% mark options as processed
+\expandafter\undef\csname opt@exercisesheets.sty\endcsname
+
+% allow further keys to be set
+\def\exshset#1{\pgfkeys{exsh,#1}}
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-ONLY: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\define@key{beamerframe}{t}[true]{% top
+ \beamer@frametopskip=-2pt\relax%
+ \beamer@framebottomskip=0pt plus 1fill\relax%
+ \beamer@frametopskipautobreak=\beamer@frametopskip\relax%
+ \beamer@framebottomskipautobreak=\beamer@framebottomskip\relax%
+}
+\fi
+%%%%%%%%%%%%%%% END BEAMER-ONLY %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% 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{\pgfkeysvalueof{/exsh/sheet counter}}}}%
+}
+
+\ifexsh@patchpagenumbers
+ \numberwithin{page}{\pgfkeysvalueof{/exsh/sheet counter}}
+ \renewcommand{\thepage}{\arabic{page}}%changed for every sheet
+\fi
+\ifthenelse{\equal{\pgfkeysvalueof{/exsh/secnumdepth}}{keep}}{}{
+ \setcounter{secnumdepth}{\pgfkeysvalueof{/exsh/secnumdepth}}
+}
+
+\AfterPackage*{hyperref}{%
+ % make PDF destinations unique:
+ \def\theHsection{\arabic{sheetid}.\arabic{\pgfkeysvalueof{/exsh/exercise counter}}}%
+ \ifexsh@patchpagenumbers
+ \def\theHpage{\arabic{sheetid}-\arabic{page}}%
+ \fi
+ %
+ % open bookmarks when typesetting a single sheet
+ \AtEndPreamble{%
+ \exsh@checkrange{0}%
+ \ifexsh@singularrange\hypersetup{bookmarksopen}\fi
+ }%
+}
+
+
+\ifexsh@settitle
+% 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
+}
+\else
+ \def\exsh@write@title#1{}
+\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{\pgfkeysvalueof{/exsh/sheet counter}}+1}%
+ \edef\exsh@temp{\expandonce{\pgfkeysvalueof{/exsh/strings/sheet}}\noexpand~\exsh@tmp}%
+ \pgfkeys{/exsh/title/.expand once={\exsh@temp}}%
+ \ifexsh@patchpagenumbers
+ \def\thepage{\arabic{\pgfkeysvalueof{/exsh/sheet counter}}-\arabic{page}}%
+ \fi
+ }{%
+ \ifexsh@patchpagenumbers
+ \def\thepage{\arabic{page}}%
+ \fi
+ }%
+ \ifexsh@exnumsheet
+ \edef\exsh@exnumstore{\arabic{\pgfkeysvalueof{/exsh/exercise counter}}}
+ \setcounter{\pgfkeysvalueof{/exsh/exercise counter}}{0}%
+ \fi
+ \numdef\exsh@tmp{\value{\pgfkeysvalueof{/exsh/sheet counter}}+1}%
+ \exsh@checkrange{\exsh@tmp}%
+ \ifexsh@isinrange
+ \ifexsh@singularrange
+ \pgfkeysgetvalue{/exsh/title}{\exsh@temp}%
+ \exsh@write@title{\exsh@temp}%
+ \fi
+ \exsh@sheethead
+ \else
+ \refstepcounter{\pgfkeysvalueof{/exsh/sheet counter}}%
+ \def\exsh@skipwhat{sheet}\expandafter\exsh@skipstuff
+ \fi
+}{%
+ \par
+ \begingroup
+ \ifnum\value{page}=1\thispagestyle{empty}\fi
+ \ifexsh@isinrange
+ \pgfkeysvalueof{/exsh/sheet end page action}%
+ \fi
+ \endgroup
+ \ifexsh@exnumsheet
+ \setcounter{\pgfkeysvalueof{/exsh/exercise counter}}{\exsh@exnumstore}%
+ \fi
+}
+\listadd{\exsh@enums}{enumerate}
+\listadd{\exsh@enums}{compactenum}
+\listadd{\exsh@enums}{asparaenum}
+\listadd{\exsh@enums}{inparaenum}
+\listadd{\exsh@enums}{subtasks}
+\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}
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+ \let\exsh@hyper@itemtrue\relax
+\else%--------- NON-BEAMER: ---------------------------------------
+ \ifexsh@html
+ \let\exsh@hyper@itemtrue\relax%
+ \else
+ \def\exsh@hyper@itemtrue{\@hyper@itemtrue}%
+ \fi
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%TODO: We need some proper switch-case here
+%evaluate csname/csdef+detokenize
+\ExplSyntaxOn
+\cs_new_eq:NN \exsh@ifsingletoken \tl_if_single_token:nTF
+\ExplSyntaxOff
+\long\def\exsh@skipstuff#1{%
+ \exsh@ifsingletoken{#1}{%
+ \ifstrequal{#1}{\begin}{\exsh@skipstuff@begin}{%
+ \ifstrequal{#1}{\end}{\exsh@skipstuff@end}{%
+ \ifstrequal{#1}{\includeexercise}{\exsh@skipstuff@incex}{%
+ \ifstrequal{#1}{\includeLexercise}{\exsh@skipstuff@incLex}{%
+ \ifstrequal{#1}{\label}{\exsh@skipstuff@label}{%
+ \ifstrequal{#1}{\subtask}{\exsh@skipstuff@subtask}{%
+ \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}{\exsh@hyper@itemtrue\refstepcounter{\@enumctr}}{}}{}%
+ \pgfkeysvalueof{/exsh/custom skip macro}{#1}}}}}}}}}}%
+ }{%
+ \exsh@skipstuff#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}{Lexercise}{\exsh@skipstuff@Lexercise}{%
+ \ifstrequal{#1}{exercise}{\refstepcounter{\pgfkeysvalueof{/exsh/exercise counter}}%
+ % automatic label for the first exercise in every included file
+ \ifthenelse{\equal{\jobname}{\currfilebase}}{}{%
+ \ifcsdef{exsh@autolabel@\currfilebase}{}{%
+ \csdef{exsh@autolabel@\currfilebase}{}%
+ \exsh@autolabel{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@subtask#1{%
+ \exsh@skipstuff \item #1
+}
+\def\exsh@skipstuff@input#1{%
+ \CatchFileDef{\exsh@inputfilecontent}{#1}{}%
+ \currfile@push
+ \currfile@set{#1}%
+ \expandafter\exsh@skipstuff\exsh@inputfilecontent\exsh@skipstuff@endfile
+}
+
+\def\exsh@skipstuff@incex{%
+ \@ifstar\exsh@skipstuff@incex@@\exsh@skipstuff@incex@%
+}
+
+\newcommand{\exsh@skipstuff@incex@}[2][]{%
+ \exsh@skipstuff\input{%
+ \ifdefvoid{\exsh@exercisespath}{}{\exsh@exercisespath/}#2}%
+}
+
+\newcommand{\exsh@skipstuff@incex@@}[2][]{%
+ \refstepcounter{\pgfkeysvalueof{/exsh/exercise counter}}
+ \exsh@autolabel{ex:#2}
+ \exsh@skipstuff
+}
+
+\def\exsh@skipstuff@incLex{%
+ \@ifstar\exsh@skipstuff@incLex@@\exsh@skipstuff@incLex@%
+}
+
+\newcommand{\exsh@skipstuff@incLex@}[2][]{%
+ \exsh@dlua{
+ local prefix =
+ "\ifdefvoid{\exsh@exercisespath}{}{\exsh@exercisespath/}"
+ exsh_cur_exercise=dofile(prefix .. "#2.lua")
+ }%
+ \expandafter\exsh@skipstuff%
+ \exsh@dlua{exsh_texprintlines(exsh_cur_exercise)}%
+}
+
+\let\exsh@skipstuff@incLex@@\exsh@skipstuff@incex@@
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\def\exsh@sheethead{%
+ \pgfkeysvalueof{/exsh/sheet start page action}%
+ \pgfkeysgetvalue{/exsh/title}{\exsh@tmp}%
+ \ifexsh@solutions
+ \expandafter\edef\expandafter\exsh@tmp{\expandonce\exsh@tmp:\noexpand~\pgfkeysvalueof{/exsh/strings/solutions}}%
+ \fi
+ \refstepcounter{\pgfkeysvalueof{/exsh/sheet counter}}%
+ \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}
+}
+\global\def\exsh@alignright#1{\hfill #1}%
+\else%--------- NON-BEAMER: ---------------------------------------
+\ifexsh@html
+% \global\def\exsh@part[#1]#2{#2}
+% \exshset{sheet sectioning cmd/.initial={\exsh@part}}
+ \global\def\exsh@alignright#1{%
+ \exsh@inshtml{<span style="float:right">}#1%
+ \exsh@inshtml{</span>}
+ }
+ \global\def\exsh@centering#1{%
+ \exsh@inshtml{<span style="display: block;text-align:center">}#1%
+ \exsh@inshtml{</span>}
+ }
+\else
+ \global\def\exsh@alignright#1{\hfill #1}%
+ \global\def\exsh@centering#1{\centering #1}
+\fi
+\def\exsh@sheethead{%
+ \pgfkeysvalueof{/exsh/sheet start page action}%
+ \pgfkeysgetvalue{/exsh/title}{\exsh@tmp}%
+ \ifexsh@solutions
+ \expandafter\edef\expandafter\exsh@tmp{\expandonce\exsh@tmp:\noexpand~\pgfkeysvalueof{/exsh/strings/solutions}}%
+ \fi
+ \refstepcounter{\pgfkeysvalueof{/exsh/sheet counter}}%
+ \pgfkeysvalueof{/exsh/sheet sectioning cmd}[\pgfkeysvalueof{/exsh/title}]{\normalsize
+ \pgfkeysvalueof{/exsh/sheet header font}%
+ \begingroup\raggedright%
+ {\pgfkeysvalueof{/exsh/subject font}\pgfkeysvalueof{/exsh/subject}}%
+ \exsh@alignright{\pgfkeysvalueof{/exsh/semester font}%
+ \pgfkeysvalueof{/exsh/semester}%
+ }\\
+ {\pgfkeysvalueof{/exsh/author font}\exsh@author}%
+ \exsh@alignright{
+ \pgfkeysvalueof{/exsh/date font}\pgfkeysvalueof{/exsh/date}%
+ }\\
+ \vskip\pgfkeysvalueof{/exsh/above sheet title skip}\relax%
+ \endgroup
+ \begingroup
+ \exsh@centering{\pgfkeysvalueof{/exsh/sheet title font}\exsh@tmp\\}\unskip
+ \endgroup
+ \begingroup
+ \pgfkeysvalueof{/exsh/sheet header font}%
+ \ifexsh@solutions%
+ \ifdefvoid{\exsh@solutionsby}{}{%
+ \begingroup
+ \pgfkeysvalueof{/exsh/solutionsby font}%
+ \vskip\pgfkeysvalueof{/exsh/above solutionsby skip}\relax
+ \exsh@centering{\pgfkeysvalueof{/exsh/strings/solutionsby}~\exsh@solutionsby\\}\unskip%
+ \endgroup
+ }%
+ \else
+ \fi
+ \ifthenelse{\equal{}{\pgfkeysvalueof{/exsh/note}}}{%
+ }{%
+ \ifbool{exsh@samplesolutions}{}{%
+ \begingroup
+ \pgfkeysvalueof{/exsh/sheet note font}%
+ \vskip\pgfkeysvalueof{/exsh/above sheet note skip}\relax
+ \exsh@centering{\pgfkeysvalueof{/exsh/note}\\}\unskip%
+ \endgroup
+ }%
+ }%
+ \endgroup
+ }%
+ \ifdim\z@=\pgfkeysvalueof{/exsh/below sheet header skip}\relax
+ \vskip-\parskip
+ \else
+ \unskip\vskip\pgfkeysvalueof{/exsh/below sheet header skip}\relax
+ \fi
+% \unskip
+% \vskip\pgfkeysvalueof{/exsh/below sheet header skip}\relax
+ \exsh@firstexonsheettrue
+ \ifexsh@patchpagenumbers%
+ \stepcounter{page}%
+ \fi
+}%
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\ifdef{\othersectionslevelsformat}{%
+ \renewcommand{\othersectionlevelsformat}[1]{%
+ \ifstrequal{#1}{section}%
+ {}%
+ {\csname the#1\endcsname\autodot\enskip}}%
+}{}
+
+%Do not use \let here as \label may change before its use
+\def\exsh@autolabel{\label}
+\def\inexlabel{\label}
+
+\newcounter{exsh@pts@cur}
+\newcounter{exsh@ptsbonus@cur}
+\newenvironment*{exercise}[1][]{%
+ % TODO: \edef is not safe with luatex and umlauts, only fixed for "oral" for now
+ % TODO: check whether the TODO above is still relevant
+ %\edef seams to work fine with lualatex from TeXLive 2020
+ \pgfkeys{exsh,every exercise,#1,includeoverride}%
+ \ifthenelse{\equal{sum}{\pgfkeysvalueof{/exsh/points}}}{%
+ \ifcsname exsh@sumpts@\the\numexpr\arabic{\pgfkeysvalueof{/exsh/exercise counter}}+1\endcsname
+ \edef\exsh@sumpts{%
+ \csname exsh@sumpts@\the\numexpr\arabic{\pgfkeysvalueof{/exsh/exercise counter}}+1%
+ \endcsname%
+ }%
+ \edef\exsh@sumptsbonus{%
+ \csname exsh@sumptsbonus@\the\numexpr\arabic{\pgfkeysvalueof{/exsh/exercise counter}}+1%
+ \endcsname%
+ }%
+ \ifnumequal{\exsh@sumpts}{0}{%
+ \ifnumequal{\exsh@sumptsbonus}{0}{}{%
+ \edef\exsh@sumpts{\exsh@sumptsbonus}%
+ \exshset{bonus}%
+ }%
+ }{%
+ \ifnumequal{\exsh@sumptsbonus}{0}{}{%
+ \edef\exsh@sumpts{\exsh@sumpts+\exsh@sumptsbonus}%
+ }%
+ }%
+ \else%
+ \def\exsh@sumpts{??}%
+ \fi%
+ \exshset{points/.expanded={\exsh@sumpts}}
+ \setcounter{exsh@pts@cur}{0}
+ \setcounter{exsh@ptsbonus@cur}{0}
+ \exsh@sumuppointstrue%
+ }{%
+ \exsh@sumuppointsfalse%
+ }%
+ \ifthenelse{\equal{off}{\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{
+% \exsh@inshtml{<span style="float:right">}\hfill
+% \enskip\exsh@alignright\bgroup%
+% \pgfkeysvalueof{/exsh/points font}}%
+% \appto\exsh@points{\egroup\exsh@inshtml{</span>}}%
+ \edef\exsh@points{\exsh@alignright{%
+ \pgfkeysvalueof{/exsh/points font}\expandonce\exsh@points
+ }}
+ }%
+ \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{\pgfkeysvalueof{/exsh/exercise counter}}%
+ \edef\exsh@tmp{[\pgfkeysvalueof{/exsh/strings/exercise} \arabic{\pgfkeysvalueof{/exsh/exercise counter}}\exsh@shortexname\expandonce\exsh@shortpoints]}%
+ \ifbool{exsh@samplesolutions}{\ifbool{exsh@sample}{\exsh@hidefalse}{\exsh@hidetrue}}{\exsh@hidefalse}%
+ \ifbool{exsh@hide}{%
+ \def\exsh@skipwhat{exercise}\exsh@skipstuff%
+ }{%
+ \expandafter\exsh@startheader\exsh@tmp{\noindent%
+ \hbox to 0pt{\hss\pgfkeysvalueof{/exsh/exercisemark}}%
+ \pgfkeysvalueof{/exsh/strings/exercise}~\arabic{\pgfkeysvalueof{/exsh/exercise counter}}\exsh@exname\exsh@firstline\expandonce\exsh@points}%
+ \ifdim\z@=\pgfkeysvalueof{/exsh/below exercise title skip}\relax
+ \vskip-\parskip
+ \else
+ \unskip\vskip\pgfkeysvalueof{/exsh/below exercise title skip}\relax
+ \fi
+ \@afterindentfalse
+ % automatic label for the first exercise in every included file
+ \ifthenelse{\equal{\jobname}{\currfilebase}}{}{%
+ \ifcsdef{exsh@autolabel@\currfilebase}{}{%
+ \csdef{exsh@autolabel@\currfilebase}{}%
+ \exsh@autolabel{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}%
+ }%
+}{%
+ %before writing point sums check that we actually computed them
+ \ifexsh@sumuppoints%
+ \immediate\write\@auxout{
+ \string\expandafter\gdef%
+ \detokenize{\csname} exsh@sumpts@\arabic{\pgfkeysvalueof{/exsh/exercise counter}}\endcsname{%
+ \arabic{exsh@pts@cur}%
+ }%
+ \string\expandafter\gdef%
+ \detokenize{\csname} exsh@sumptsbonus@\arabic{\pgfkeysvalueof{/exsh/exercise counter}}\endcsname{%
+ \arabic{exsh@ptsbonus@cur}%
+ }%
+ }%
+ \fi
+ \ifexsh@beamer\clearpage\fi%%%% <<<<<BEAMER ONLY%%%%%%%%%%%%%%%%%
+}
+\newcommand{\exsh@label}[2]{#1{#2}\leavevmode\ignorespaces}
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\newcommand{\exsh@startheader}[2][]{%
+ \newpage
+ \stepcounter{framenumber}
+% \begin{block}{}
+% \pgfkeysvalueof{/exsh/exercise title font}{#2}%
+% \end{block}
+ \ifbool{exsh@beameruseblocks}{%
+ \begingroup
+ \usebeamercolor{block title}
+ \setbeamercolor{block body}{bg=bg,fg=fg}
+ \block{}{\pgfkeysvalueof{/exsh/exercise title font}{#2}}%
+ \endblock
+ \endgroup
+ }{
+ \begin{beamercolorbox}[rounded=true,wd={\textwidth}]%
+ {block title}
+ \pgfkeysvalueof{/exsh/exercise title font}{#2}
+ \end{beamercolorbox}
+ }
+ \ifexsh@patchenumerate
+ \setbeamertemplate{enumerate items}{\insertenumlabel}
+ \renewcommand{\insertenumlabel}{
+ \ifnum\@enumdepth=1
+ \alph{enumi})
+ \else\ifnum\@enumdepth=2
+ \arabic{enumii}.
+ \else
+ \roman{enumiii}
+ \fi\fi
+ }
+ \fi
+}%
+\else%--------- NON-BEAMER: ---------------------------------------
+\ifexsh@usestartsection
+ \newcommand{\exsh@startheader}[2][]{%
+ \@startsection{section}{1}{\z@}{%
+ \ifexsh@firstexonsheet
+ \pgfkeysvalueof{/exsh/above first exercise skip}%
+ \else
+ \pgfkeysvalueof{/exsh/above exercise skip}
+ \fi
+ }{1em}% afterskip corrected below
+ {\pgfkeysvalueof{/exsh/exercise title font}}%
+ [#1]{#2}%
+ \exsh@firstexonsheetfalse
+ }%
+\else
+ \newcommand{\exsh@startheader}[2][]{%
+ \ifexsh@firstexonsheet
+ \ifdim\z@=\pgfkeysvalueof{/exsh/above first exercise skip}\relax
+ \vskip-\parskip
+ \else
+ \unskip%
+ \vskip\pgfkeysvalueof{/exsh/above first exercise skip}\relax
+ \fi
+ \else
+ \ifdim\z@=\pgfkeysvalueof{/exsh/above exercise skip}\relax
+ \vskip-\parskip
+ \else
+ \unskip%
+ \vskip\pgfkeysvalueof{/exsh/above exercise skip}\relax
+ \fi
+ \fi
+ {\pgfkeysvalueof{/exsh/exercise title font} #2}%
+ \exsh@firstexonsheetfalse
+ }
+\fi
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%includeoverride is not part of the public interface
+\exshset{includeoverride/.style={}}
+\def\includeexercise{%
+ \@ifstar\exsh@includeexercise@\exsh@includeexercise%
+}
+
+\newcommand{\exsh@includeexercise}[2][]{%
+ \ifbool{exsh@filenameasexercisename}{%
+ \exshset{includeoverride/.style={name={\detokenize{#2}},#1}}%
+ }{%
+ \exshset{includeoverride/.style={#1}}%
+ }%
+ \input{\ifdefvoid{\exsh@exercisespath}{}{\exsh@exercisespath/}#2}
+ \exshset{includeoverride/.style={}}
+}
+
+\newcommand{\exsh@includeexercise@}[2][]{%
+ \ifbool{exsh@filenameasexercisename}{%
+ \exshset{includeoverride/.style={name={\detokenize{#2}},#1}}%
+ }{%
+ \exshset{includeoverride/.style={#1}}%
+ }%
+ \begingroup
+ %auto labelling is still allowed, but other labels are forbidden
+ %here we may use \let as the definition is close to its use
+ \let\exsh@autolabel\label
+ \let\inexlabel\label
+ \def\label##1{%
+ \PackageError{exercisesheets}{\string\label{##1}\space
+ inside \string\includeexercise*}{}%
+ }
+ \input{\ifdefvoid{\exsh@exercisespath}{}{\exsh@exercisespath/}#2}
+ \endgroup
+ \exshset{includeoverride/.style={}}
+}
+
+
+\def\includeLexercise{%
+ \@ifstar\exsh@includeLexercise@\exsh@includeLexercise%
+}
+
+\ifluatex
+\newcommand{\exsh@includeLexercise}[2][]{%
+ \ifbool{exsh@filenameasexercisename}{%
+ \exshset{includeoverride/.style={name={#2},#1}}%
+ }{%
+ \exshset{includeoverride/.style={#1}}%
+ }%
+ \directlua{
+ local prefix =
+ "\ifdefvoid{\exsh@exercisespath}{}{\exsh@exercisespath/}"
+ exsh_cur_exercise=dofile(prefix .. "#2.lua")
+ exsh_texprintlines(exsh_cur_exercise)
+ }%
+ \exshset{includeoverride/.style={}}%
+}
+
+\newcommand{\exsh@includeLexercise@}[2][]{%
+ \ifbool{exsh@filenameasexercisename}{%
+ \exshset{includeoverride/.style={name={#2},#1}}%
+ }{%
+ \exshset{includeoverride/.style={#1}}%
+ }%
+ \begingroup
+ %auto labelling is still allowed, but other labels are forbidden
+ %here we may use \let as the definition is close to its use
+ \let\exsh@autolabel\label
+ \def\label##1{%
+ \PackageError{exercisesheets}{\string\label{##1}\space
+ inside \string\includeLexercise*}{}%
+ }
+ \directlua{
+ local prefix =
+ "\ifdefvoid{\exsh@exercisespath}{}{\exsh@exercisespath/}"
+ exsh_cur_exercise=dofile(prefix .. "#2.lua")
+ exsh_texprintlines(exsh_cur_exercise)
+ }%
+ \endgroup
+ \exshset{includeoverride/.style={}}
+}
+\else
+ \newcommand{\exsh@includeLexercise}[2][]{
+ \refstepcounter{\pgfkeysvalueof{/exsh/exercise counter}}
+ Lexercise needs Lua\LaTeX!
+ }
+ \let\exsh@includeLexercise@\exsh@includeLexercise
+\fi
+
+\AfterPackage*{varioref}{
+ \labelformat{section}{\pgfkeysvalueof{/exsh/strings/exercise}~\arabic{section}}
+}
+
+
+\let\exsh@subexn\getrefnumber
+
+\ifexsh@patchenumerate
+ \AfterPackage*{varioref}{
+ \labelformat{enumi}{\arabic{\pgfkeysvalueof{/exsh/exercise counter}}.\alph{enumi}}
+ \def\exsh@afterdot#1.#2{#2}%x.y -> y
+ \def\exsh@subexn#1{%
+ \if\getrefnumber{#1}0%
+ 0%
+ \else%x.y->y, then inverse \@alph
+ \the\numexpr(\expandafter\expandafter\expandafter%
+ \expandafter\expandafter\expandafter%
+ \expandafter`\expandafter\expandafter\expandafter%
+ \exsh@afterdot\getrefnumber{#1}-`a+1)\relax%
+ \fi%
+ }
+ }
+ \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.}
+ }
+ \def\theHenumi{enumi.\arabic{\pgfkeysvalueof{/exsh/sheet counter}}.\arabic{\pgfkeysvalueof{/exsh/exercise counter}}.\arabic{enumi}}
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+ % code below breaks [] argument after \begin{enumerate}
+ % when beamer is used
+ % in beamer we set item labels separately
+ % see beamer specific def. of \exsh@startheader
+\else%--------- NON-BEAMER: ---------------------------------------
+ \AtEndPreamble{%
+ \@ifpackageloaded{paralist}{}{%
+ \@ifpackageloaded{enumitem}{}{%
+ \apptocmd{\enumerate}{
+ \ifnum\@enumdepth=1%
+ \def\labelenumi{(\alph{enumi})}
+ \def\labelenumii{\arabic{enumii}.}
+ \def\labelenumiii{\roman{enumiii}.}
+ \fi
+ }{}{}%
+ }%
+ }%
+ }%
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\fi
+
+\newcommand{\subexnref}[1]{\exsh@subexn{#1}}
+\newcommand{\subexlref}[1]{(\@alph{\exsh@subexn{#1}})}
+
+%for now this is not part of the public interface
+\exshset{subtask counter/.initial={enumi}}
+\exshset{subtask environment/.initial={enumerate}}
+\exshset{subtask item/.initial={item}}
+\edef\exsh@subtaskctr{\pgfkeysvalueof{/exsh/subtask counter}}
+\def\exsh@subtaskenv{\pgfkeysvalueof{/exsh/subtask environment}}
+\def\exsh@subtaskitm{\pgfkeysvalueof{/exsh/subtask item}}
+
+%define subex as an alias for enumi
+\expandafter\let\expandafter\c@subex%
+ \csname c@\exsh@subtaskctr\endcsname
+\expandafter\let\expandafter\p@subex%
+ \csname p@\exsh@subtaskctr\endcsname
+\expandafter\let\expandafter\thesubex%
+ \csname the\exsh@subtaskctr\endcsname
+\expandafter\let\expandafter\theHsubex%
+ \csname theH\exsh@subtaskctr\endcsname
+\expandafter\let\expandafter\cl@subex%
+ \csname cl@\exsh@subtaskctr\endcsname
+
+% reset equation numbering for each exercise
+\@addtoreset{equation}{\pgfkeysvalueof{/exsh/exercise counter}}
+
+\long\def\exsh@savemaintask#1{%
+ \global\def\exsh@restatetaskmain{#1}%
+ #1%
+}
+
+\newenvironment{maintask}[1][]{%
+ \pgfkeys{exsh,#1}%
+ \pgfkeysvalueof{/exsh/main task font}%
+ \ifbool{exsh@savetasks}{\Collect@Body\exsh@savemaintask}{}%
+ \ignorespaces
+}{}
+
+\newenvironment{subtasks}[1][]{%
+ \pgfkeys{exsh,#1}%
+ \begin{\exsh@subtaskenv}
+ \def\exsh@ifwithinsubt##1##2{##1}
+ \ignorespaces\begingroup
+}{
+ \endgroup
+ \end{\exsh@subtaskenv}%
+}
+
+\def\exsh@ifwithinsubt#1#2{#2}
+
+\def\exsh@ensuressubtasks{%
+ \exsh@ifwithinsubt{
+ \endgroup\begingroup
+ }{%
+ \PackageWarning{exercisesheets}{%
+ Using \subtask\space without a subtasks environment
+ is unsupported
+ }{}%
+ }%
+}
+
+\newcommand{\subtask}[2][]{%
+ \exsh@ensuressubtasks
+ \pgfkeys{exsh,#1}%
+ \csname\exsh@subtaskitm\endcsname%
+ {\pgfkeysvalueof{/exsh/subtask font} #2}%
+ \ifbool{exsh@savetasks}{%
+ \csgdef{exsh@restatetask\arabic{\exsh@subtaskctr}}{#2}%
+ \csdef{exsh@restatetaskcur}{#2}%
+ }{}%
+}
+
+\def\exsh@ensuresavetasks{%
+ \ifbool{exsh@savetasks}{}{%
+ \PackageError{exercisesheets}{%
+ If you want to restate something, you have to %
+ use the option savetasks.%
+ }{}%
+ }%
+}
+
+\def\restatetask{%
+ \exsh@ensuresavetasks%
+ \@ifstar\exsh@restatetask@\exsh@restatetask%
+}
+
+\newcommand{\exsh@restatetask}[1][main]{%
+ {\pgfkeysvalueof{/exsh/task restate font}%
+ \csname exsh@restatetask#1\endcsname}%
+}
+
+\newcommand{\exsh@restatetask@}[1][main]{%
+ {\pgfkeysvalueof{/exsh/task restate font}%
+ \csname exsh@restatetask#1\endcsname}\\%
+}
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+ \let\restatetaskbeamer\restatetask
+\else%--------- NON-BEAMER: ---------------------------------------
+ \def\restatetaskbeamer{%
+ \@ifstar\exsh@restatetaskbeamer\exsh@restatetaskbeamer%
+ }
+ \newcommand{\exsh@restatetaskbeamer}[1][main]{}
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\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)%
+}
+
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+ \let\exsh@postsolutionclear\clearpage
+\else%--------- NON-BEAMER: ---------------------------------------
+ \let\exsh@postsolutionclear\par
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\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
+}{%
+ \ifbool{exsh@beamersolution}{}{%
+ \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+ \ifbool{exsh@oralsolutions}{\exsh@postsolutionclear}{}%
+ }{%
+ \ifbool{exsh@nonoralsolutions}{\exsh@postsolutionclear}{}%
+ }%
+ }%
+}
+
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\def\exsh@solutiontitle#1{
+ \ifbool{exsh@beameruseblocks}{%
+ \begin{alertblock}{}%
+ {\pgfkeysvalueof{/exsh/solution title font}%
+ \pgfkeysvalueof{/exsh/strings/solution} %
+ (\pgfkeysvalueof{/exsh/strings/exercise} \arabic{\pgfkeysvalueof{/exsh/exercise counter}}%
+ \ifnum\@enumdepth>0\alph{subex}\fi)} %
+ \ifbool{exsh@headerrestate}{
+ \exsh@ensuresavetasks
+ \csname exsh@restatetask%
+ \ifnum\@enumdepth>0cur\else main\fi%
+ \endcsname%
+ }{}%
+ \end{alertblock}
+ }{
+ \begin{beamercolorbox}[rounded=true,wd={#1}]%
+ {block title alerted}
+ {\pgfkeysvalueof{/exsh/solution title font}%
+ \pgfkeysvalueof{/exsh/strings/solution} %
+ (\pgfkeysvalueof{/exsh/strings/exercise} \arabic{\pgfkeysvalueof{/exsh/exercise counter}}%
+ \ifnum\@enumdepth>0\alph{subex}\fi)} %
+ \ifbool{exsh@headerrestate}{
+ \exsh@ensuresavetasks
+ \csname exsh@restatetask%
+ \ifnum\@enumdepth>0cur\else main\fi%
+ \endcsname%
+ }{}%
+ \end{beamercolorbox}
+ }
+}
+\newcommand{\solutiontitle}[1][\linewidth]{
+ \ifhmode \linebreak\fi\exsh@solutiontitle{#1}
+}
+
+\newcommand{\deferredsolutiontitle}[1][\linewidth]{
+ \ifbool{exsh@defersolutiontitle}{%
+ \ifhmode \linebreak\fi\exsh@solutiontitle{#1}
+ }{}%
+}
+
+
+\long\def\exsh@processframes#1\newframe{%
+\ifstrequal{#1}{}{}{%
+\clearpage
+\begin{frame}[t]{}
+` \unskip\vskip1pt\vskip-\parskip
+ \solutiontitle[\textwidth]
+ #1
+\end{frame}%
+\exsh@processframes%
+}%no whitespace here is crucial for end detecttion
+}
+
+
+\long\def\exsh@collectedframe#1{
+\exsh@processframes#1\newframe\newframe
+}
+
+\else%--------- NON-BEAMER: ---------------------------------------
+%this command is only usefule for exercisesheets-beamer to place
+%the deferred title within a new frame
+\newcommand{\solutiontitle}[1][]{}
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\def\exsh@startsolution{%
+ \ifnum\@enumdepth=0
+ \ifbool{exsh@framed}{}{\clearpage\stepcounter{framenumber}}
+ \fi
+% \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{\pgfkeysvalueof{/exsh/exercise counter}}%
+% \alph{subex})%
+% \endblock
+ \ifbool{exsh@framed}{\exsh@defersolutiontitletrue}{}
+ \ifbool{exsh@defersolutiontitle}{}{%
+ \ifhmode \linebreak\fi
+ \exsh@solutiontitle{\linewidth}
+ }%
+ \let\next\relax
+ \ifbool{exsh@framed}{%
+ \def\next{\Collect@Body\exsh@collectedframe}%
+ \ifbool{exsh@fragile}{%
+ \ifluatex%
+ \def\next{\exsh@start@lframed@}
+ \else
+ \PackageError{exercisesheets}{Fragile frames require
+ LuaLaTeX!}{}
+ \fi%
+ }{}%
+ }{}%
+ \next%
+}%
+\else%--------- NON-BEAMER: ---------------------------------------
+\def\exsh@startsolution{\@afterindentfalse
+ \vskip\pgfkeysvalueof{/exsh/above solution skip}\relax%
+ {\parindent \z@
+ \pgfkeysvalueof{/exsh/solution title font}%
+ \pgfkeysvalueof{/exsh/strings/solution}%
+ \pgfkeysvalueof{/exsh/solution title separator}%
+ }\nobreak%
+ \@afterheading
+}%
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\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}%
+ }%
+}
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-SPECIFIC: %%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\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
+}{%
+% \ifbool{exsh@framed}{\end{frame}}{}
+ \ifthenelse{\equal{oral}{\pgfkeysvalueof{/exsh/points}}}{%
+ \ifbool{exsh@oralsolutions}{\clearpage}{}%
+ }{%
+ \ifbool{exsh@nonoralsolutions}{\clearpage}{}%
+ }%
+}
+\else%--------- NON-BEAMER: ---------------------------------------
+%the regular version of exercisesheets.sty skips all beamer solutions
+\newenvironment{beamersolution}[1][]{\exsh@skipsolution}{}%
+\fi
+%%%%%%%%%%%%%%% END BEAMER-SPECIFIC %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\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%
+ \ifexsh@sumuppoints%
+ \ifexsh@bonus%
+ \addtocounter{exsh@ptsbonus@cur}{#2}
+ \else%
+ \addtocounter{exsh@pts@cur}{#2}
+ \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}[1][]{%
+ \ifexsh@showtodos
+ \ifmmode
+ \text{\pgfkeysvalueof{/exsh/todo marker font}TODO #1}%
+ \else
+ {\pgfkeysvalueof{/exsh/todo marker font}TODO #1}%
+ \fi
+ \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}%
+}
+
+
+%%%%%%%%%%%%%%% BEGIN BEAMER-ONLY: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\ifexsh@beamer
+\ifexsh@patchheadandfoot
+ \setbeamertemplate{headline}{}%
+ \setbeamertemplate{footline}{}%
+\fi
+\ifbool{exsh@beamerwithheadline}{%
+ \setbeamertemplate{headline}{%
+% \leavevmode%
+ \begin{beamercolorbox}[wd=\paperwidth,vmode]{frametitle}
+ \vspace{0.4em}
+ \leavevmode
+ \begingroup
+ \footnotesize%
+ \hspace*{2ex}{\pgfkeysvalueof{/exsh/subject font}%
+ \pgfkeysvalueof{/exsh/subject}} \hfill%
+ {\pgfkeysvalueof{/exsh/semester font}%
+ \pgfkeysvalueof{/exsh/semester}}\hspace{2ex}\hfil%
+ \vspace{1mm}\linebreak%
+ \hspace*{2ex}{\pgfkeysvalueof{/exsh/author font}\exsh@author}%
+ \hfill{\pgfkeysvalueof{/exsh/date font}%
+ \pgfkeysvalueof{/exsh/date}}%
+ \hspace{2ex}\hfil%\vspace{-1em}
+ \endgroup
+ \vspace{0.4em}
+ \end{beamercolorbox}%
+ \vspace*{3mm}
+ \vskip\pgfkeysvalueof{/exsh/below slide headline skip}\relax%
+ }
+ \addtobeamertemplate{frametitle}{\vspace{-3mm}}{}
+}{}%
+
+
+\ifbool{exsh@beamerwithfootline}{%
+ \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%
+ }
+}{}%
+\fi
+%%%%%%%%%%%%%%% END BEAMER-ONLY %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\ifluatex
+ \let\exsh@dlua\directlua
+\else
+ \def\exsh@dlua#1{}
+\fi
+
+%change only some catcodes to
+\begingroup
+\catcode`!=0
+\catcode`\@=11
+\catcode`\_=12
+\catcode`\{=12 %set those to the same value (11/12) as below!
+\catcode`\}=12 %
+\catcode`<=1
+\catcode`>=2
+\catcode`\~=11
+\catcode`\\=11
+%% Expanded, when \catcode`\^^M=12 holds
+!global!long!def!exsh@start@Lexercise#1\end{Lexercise}< %
+ !exsh@dlua<exsh_cur_exercise=exercise({#1})> %
+ !endgroup!end<Lexercise>%
+>
+!global!long!def!exsh@start@skip@Lexercise#1\end{Lexercise}< %
+ !exsh@dlua<exsh_cur_exercise=exercise({#1})> %
+ !ifluatex!else%
+ !refstepcounter<!pgfkeysvalueof</exsh/exercise counter>>%
+ !fi
+ !endgroup!endgroup%
+ !expandafter!exsh@skipstuff%
+ !exsh@dlua<exsh_texprintlines(exsh_cur_exercise)>%
+>
+!global!long!def!exsh@start@lframed#1\end{solution}< %
+ !exsh@dlua<exsh_cur_solution=fragileframed([[#1]])> %
+ !endgroup!end<solution>%
+ !exsh@dlua<exsh_texprintlines(exsh_cur_solution)>%
+>
+!endgroup
+
+\def\exsh@lua@catcodesBG{
+\begingroup
+\catcode`!=12
+\catcode`\$=12
+\catcode`\#=12
+\catcode`\_=12
+\catcode`\^=12
+\catcode`\&=12
+\catcode`\|=12
+\catcode`\{=12 %set those to the same value (11/12) as above!
+\catcode`\}=12 %
+\catcode`\~=12
+\catcode`\@=11
+\catcode`\%=12
+\catcode`\ =12
+\catcode9=12
+\catcode`\^^I=12
+\catcode`\^^J=12\catcode`\^^M=12\catcode`\\=11\endlinechar-1}
+
+\newenvironment{Lexercise}{%
+ \exsh@lua@catcodesBG\exsh@start@Lexercise%
+}{%
+ \ifluatex
+ \exsh@dlua{exsh_texprintlines(exsh_cur_exercise)}%
+ \else
+ \refstepcounter{\pgfkeysvalueof{/exsh/exercise counter}}
+ Lexercise needs Lua\LaTeX!
+ \fi
+}
+
+\def\exsh@skipstuff@Lexercise{\exsh@lua@catcodesBG\exsh@start@skip@Lexercise}%
+\def\exsh@start@lframed@{\exsh@lua@catcodesBG\exsh@start@lframed}
+
+\exsh@dlua{dofile(kpse.find_file("exsh_lexercise.lua"))}