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

13 Dec 2023

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On 13 Dec 2023, at 17:13, Gerion Entrup  wrote:
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:
I don't have the answer to your other questions but I do have an example for this one.
It's not mine - I'm fairly sure it came from this list but I can't find who that was any more.

\startluacode
userdata = userdata or { }

function userdata.mycommand(keywords, keyvals, str) 
    keyword_options = utilities.parsers.settings_to_array(keywords)
    named_values = utilities.parsers.settings_to_hash(keyvals)

    context('First option = ' .. keyword_options[1])
    context('\\par')
    context('Color chosen = ' .. named_values['color'])
    context('\\par')
    context('Curly braces = ' .. str)
    context('\\par')
end
\stopluacode

\def\mycommand[#1][#2]#3{\ctxlua{
    userdata.mycommand('#1', '#2', [==[#3]==])}} 

\starttext
\mycommand[top, inmargin, now][color=green, roof=gabled]{Anne of Green Gables?}
\stoptext

—
Bruce Horrocks
Hampshire, UK