From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Evaluating a Lua expression at the end
Date: Mon, 13 Apr 2015 15:32:04 +0200 [thread overview]
Message-ID: <552BC554.6040009@wxs.nl> (raw)
In-Reply-To: <CAGO+Kuzh_9ew6DxvF3HZWGff3qQWNwhgC-72etqDyrqq7cAq=Q@mail.gmail.com>
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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next prev parent reply other threads:[~2015-04-13 13:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-13 11:53 Kumar Appaiah
2015-04-13 12:05 ` Norbert Melzer
2015-04-13 12:06 ` Norbert Melzer
2015-04-13 12:26 ` Procházka Lukáš Ing. - Pontex s. r. o.
2015-04-13 13:48 ` Kumar Appaiah
2015-04-13 14:48 ` Procházka Lukáš Ing. - Pontex s. r. o.
2015-04-13 13:32 ` Hans Hagen [this message]
2015-04-13 13:50 ` Kumar Appaiah
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