Dear List,
I'm trying to have problem solutions automatically collected, each with
its corresponding problem number, e.g. 2.3, and then typeset at the end
of a document. Thus, I imagine something like
\startproblem{A problem title} % Problem 1.1
A question
\startsolution
An answer
\stopsolution
\stopproblem
And then the solution(s) would appear at the end (with the "1.1"
remembered from when the problem was typeset):
Solution to Problem 1.1.
An answer
It seems that buffers are the way to do this. But I cannot quite get
the automatic numbering to work. The delayed evaluation and information
passing between lua and ConTeXt has me confused and tangled in a knot.
Below is a minimal almost-working example. The issue is in the line
{\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
which ends up putting the verbatim string "\getnumber[problem]" into the
temp buffer, rather than the typeset result, which would be something
like 1.1 or 1.2.
I've read the cld-mkiv.pdf manual, but I must be missing a simple
solution to getting ConTeXt to send back the result of
\getnumber[problem]. I've also tried the analogous
context.getnumber({"problem"}), though without success.
Does anyone see what I am missing?
Many thanks!
-Sanjoy
\defineenumeration[problem]
[title=yes, text=Problem, way=bychapter, prefix=chapter]
\defineenumeration[solution][problem]
\setupenumeration [solution][text={Solution to problem}, number=no]
\def\test#1{[#1]}
% appendbuffer modified from Sietse Brouwer's on mailing list (Jan 15, 2013)
\startluacode
userdata = userdata or { }
function userdata.addTempToBuffer(buffername, problem)
buffers.append(
buffername,
'\\startsolution{' .. problem .. '}\n' ..
buffers.getcontent('APPENDTEMP') .. '\n\\stopsolution\n\n'
)
end
\stopluacode
\def\startappendbuffer[#1]%
{\def\stopappendbuffer%
{\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
\dostartbuffer[APPENDTEMP][startappendbuffer][stopappendbuffer]}
\starttext
\chapter{One}
\startproblem{Test}
Test problem
\startappendbuffer[soln]
Solution
\stopappendbuffer
\stopproblem
\startproblem{Test}
Test problem
\startappendbuffer[soln]
Solution
\stopappendbuffer
\stopproblem
\typebuffer[soln]
\stoptext
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