I'm writing a module to typeset problems/tests. Depending on a flag,
solutions are either displayed or not. If the solutions are not displayed,
I want to give a certain amount of empty vertical space for the student's
work. This is where my difficulty begins.
The typesetting works with the solutions displayed (\def\examshowsolutions}
{yes}) but not with the empty vertical space (\def\examshowsolutions{no}).
I get an "Emergency stop" that I cannot figure out. Here's the code for a
minimal example of my difficulty..
\def\setupsolutions{
\doifelse{\examshowsolutions}{yes}
{\defineenumeration[SOLUTION] % display the solutions
[text=\Word{solution},number=no,
after={\vskip1ex}]}
{\definebuffer[SOLUTION] % hide solutions,
\setupbuffer[SOLUTION][local=yes]}
}
\def\startsolution{\dosingleempty\dostartsolution}
\def\dostartsolution[#1]{
\getparameters[solution][height=1em,] % set defaults (needed in case
parameters missing)
\iffirstargument
\writestatus{DEBUG}{--First argument: |#1|}
\getparameters[solution][#1,]
\fi
\writestatus{DEBUG}{--\solutionheight--}
\startSOLUTION
\writestatus{DEBUG}{--dostartsolution...finished}
}
\def\stopsolution{
\stopSOLUTION
\writestatus{DEBUG}{--dostopsolution...1}
\doif{\examshowsolutions}{no}{\godown[\solutionheight]}
\writestatus{DEBUG}{--dostopsolution...finished}
}
\starttext
\def\examshowsolutions{no} % control whether solutions are displayed
\setupsolutions
\startsolution % test without vertical height specified
Here is a solution.
\stopsolution
\startsolution[height=5em] % test with vertical height specified
Here is another solution.
\stopsolution
\stoptext
The error occurs with the \startSOLUTION command.
Here's the log file:
(/home/kenny/texlive/2013/texmf-dist/tex/context/base/cont-yes.mkiv
ConTeXt ver: 2013.05.28 00:36 MKIV current fmt: 2013.8.6 int:
english/english
system > 'cont-new.mkiv' loaded
(/home/kenny/texlive/2013/texmf-dist/tex/context/base/cont-new.mkiv)
system > files > jobname 'check', input './check', result 'check'
fonts > latin modern fonts are not preloaded
languages > language 'en' is active
(/home/kenny/courses/Fall2014/phys1310/exam/check.tex{/home/kenny/texlive/2
013/texmf-dist/fonts/map/pdftex/context/mkiv-base.map}
fonts > preloading latin modern fonts (second stage)
fonts > typescripts > unknown library 'loc'
{/home/kenny/texlive/2013/texmf-dist/fonts/map/dvips/lm/lm-math.map}
{/home/kenny/texlive/2013/texmf-dist/fonts/map/dvips/lm/lm-rm.map}
fonts > 'fallback modern rm 12pt' is loaded
DEBUG > --1em--
))
! Emergency stop.
system > tex > error on line 0 in file : Emergency stop ...
<empty file>
<*> cont-yes.mkiv
*** (job aborted, no legal \end found)
! ==> Fatal error occurred, no output PDF file produced!
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