On 4/13/2015 1:53 PM, Kumar Appaiah wrote:
Hi.
I am trying to set up a system where I can use Lua to find a total
that I can display at the end. For example, if I set a question paper,
after each question, I do a \directlua{total = total + 4}, assuming
this question has 4 points. At the top of my document, I now want to
say "Total points:" and display the value of total.
Now, naturally, using \directlua gives me 0, since total is 0 at the
beginning. But \latelua didn't seem to be what I am looking for. Could
someone please guide me in the right direction?
forget about latelua ... by the time that kicks in typesetting is done
already .. you need to go multipass:
\starttext
\startluacode
local name = nil
local temp = 0
function document.startwhatever(s)
name = s
temp = 0
end
function document.addwhatever(n)
temp = temp + n
context(n)
end
function document.stopwhatever()
job.variables.save("document:temp:"..name,temp)
end
function document.getwhatever(s)
context(job.variables.collected["document:temp:"..s])
end
\stopluacode
\def\startwhatever[#1]{\ctxlua{document.startwhatever("#1")}}
\def\stopwhatever {\ctxlua{document.stopwhatever()}}
\def\addwhatever #1{\ctxlua{document.addwhatever(#1)}}
\def\getwhatever #1{\ctxlua{document.getwhatever("#1")}}
total: \getwhatever{foo}
\startwhatever[foo]
test 1: \addwhatever{10}\par
test 2: \addwhatever{20}\par
test 3: \addwhatever{30}\par
\stopwhatever
\stoptext
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