That's great. This is exactly what I needed for now, though Max's magic may be useful in the future. On Sun, Mar 30, 2025 at 2:21 PM Wolfgang Schuster < wolfgang.schuster.lists@gmail.com> wrote:
Am 29.03.2025 um 16:06 schrieb Mohammad Hossein Bateni:
Hello,
I have some code like this:
--------------------------------- \def\MakeSomething{... some code that returns number 12}
\startluacode function WorkWithSomething(data) -- call MakeSomething to obtain 12 -- base on the value above make some decisions end
WorkWithSomething(some_data) \stopluacode ---------------------------------
If I use context.MakeSomething() inside the lua block, this is buffered till the end of the block, so I can't get the result and work with it.
If MakeSomething is a command already "edef-ed", I can use tokens.getters.macro.MakeSomething to find the value.
If MakeSomething has an argument which is determined within the lua block, then I can't use this hack.
The ugly partial solution I have found is to change the signature of WorkWithSomething to receive an argument and then I replicate the parameters of MakeSomething on the TeX side:
--------------------------------- \def\MakeSomething#1{...}
\startluacode function WorkWithSomething(data,MakeSomethingOutput) -- we wanted to use some computation on data to obtain input to MakeSomething -- then call MakeSomething to obtain its result end \stopluacode
\ctxlua{WorkWithSomething(some_data, "\MakeSomething{replicate processing on data to obtain input to this macro}")} ---------------------------------
Is there a more elegant solution? Ideally I want a way to start a TeX process under Lua, and process the macros there before I get to the next line of Lua code.
In my motivation, MakeSomething is \datasetvariable. I wanted to look up something in the dataset and use it for the rest of computation/typesetting.
ConTeXt provides the following function to access dataset values:
job.datasets.getdata(name,tag,key,default)
Wolfgang
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