From 8d712f0899f689942f0ae7e37ff36bc0f64dca25 Mon Sep 17 00:00:00 2001
From: Frank Fuhlbrück
Date: Wed, 2 Feb 2022 17:42:43 +0100
Subject: skipping+fragile frames in Lua started

---
 exercisesheets.sty | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

(limited to 'exercisesheets.sty')

diff --git a/exercisesheets.sty b/exercisesheets.sty
index 572549a..d096e54 100644
--- a/exercisesheets.sty
+++ b/exercisesheets.sty
@@ -64,6 +64,7 @@
 \newif\ifexsh@beameruseblocks
 \newif\ifexsh@defersolutiontitle
 \newif\ifexsh@framed
+\newif\ifexsh@fragile
 \fi
 %Also only true for beamer, but we want to use it elsewhere
 \newif\ifexsh@beamersolution
@@ -174,6 +175,8 @@
   defersolutiontitle/.default=true,
   framed/.is if=exsh@framed,
   framed/.default=true,
+  fragile/.is if=exsh@fragile,
+  fragile/.default=true,
   beamersolution/.initial={false},
   beamerwithheadline/.initial={false},
   beameruseblocks/.initial={false},
@@ -648,6 +651,8 @@
 \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
@@ -1293,7 +1298,19 @@
     \ifhmode \linebreak\fi
     \exsh@solutiontitle{\linewidth}
   }%
-  \ifbool{exsh@framed}{\Collect@Body\exsh@collectedframe}{}%
+  \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
@@ -1561,10 +1578,15 @@
 >
 !global!long!def!exsh@start@skip@Lexercise#1\end{Lexercise}< %
   !exsh@dlua<exsh_cur_exercise=exercise({#1})> %
+  !ifluatex!else!refstepcounter<section>!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=[[#1]]> %
+  !endgroup!end<solution>%
+>
 !endgroup
 
 \def\exsh@lua@catcodesBG{
@@ -1590,11 +1612,13 @@
   \ifluatex
     \exsh@dlua{exsh_texprintlines(exsh_cur_exercise)}%
   \else
+    \refstepcounter{section}
     Lexercise needs Lua\LaTeX!
   \fi
 }
 
+%TODO:setcounter without luatex
 \def\exsh@skipstuff@Lexercise{\exsh@lua@catcodesBG\exsh@start@skip@Lexercise}%
-% \exsh@lua@catcodesBG\exsh@start@skip@Lexercise}
+\def\exsh@start@lframed@{\exsh@lua@catcodesBG\exsh@start@lframed}
 
 \exsh@dlua{dofile("exsh_lexercise.lua")}
-- 
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