[NTG-context] LMTX: Command handling, Interface between TeX and Lua

[Gerion Entrup <gerion.entrup@flump.de>]

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Hi,

I'd like to understand more of the inner workings of LMTX.
When I understand it right, most of the code is now processed in Lua but
I was not able to find it.

For example, I tried to find out how setupitemgroup is handled (just as
an example of a more complex command). The wiki has a (kind of)
autogenerated description:
https://wiki.contextgarden.net/Command/setupitemgroup
I found the data for this (at least this is my guess) here:
tex/texmf-context/tex/context/interface/mkiv/i-itemgroup.xml

Are these xml files created by hand or somehow generated? Now, when I
use `\setupitemgroup[itemize:1][symbol=3,itemalign=middle]`: How are the
arguments handled and is this a generic process or specific to each
command?

Is there a simple way to define a new command/environment and handle
the keyword arguments in Lua? For example defining a frontend command
like this:

\startsomething[firstword={Some},secondword={Text}]
	Body
\stopsomething


which I can handle in some lua code like this:

function something(firstword, secondword, body)
	tex.print(firstword)
	tex.print(secondword)
	tex.print(body)
end

Are there any resources beside the context code itself where I can learn
that?

Gerion

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