[NTG-context] Re: Own command definition breaks with interaction: Use of \do_my_command doesn't match its definition

29 Jan 2024

      Hi,

You can try:
...
\unexpanded\def\do_my_command[#1]#2{%
But there is probably a cleaner way to implement optional arguments with lua?

Best wishes,
Taco
...
On 25 Jan 2024, at 09:18, Gerion Entrup  wrote:
Hi,
I want to make a proper definition of a new command to be able to
process it in Lua. I found something on StackOverflow [1] but that
breaks in enumeration _and_ when interaction is enabled and I do not
understand why? Can you give me some help here?
I want to make commands like \foo{bla} and \foo[b]{bla} possible at the
same time. Here is a minimal example (also attached):
```
\startluacode
function userdata.my_command(keywords, text)
commands.writestatus("test", string.format("text: %s, config: %s", text, keywords))
   local cfg = utilities.parsers.settings_to_hash(keywords)
if cfg['emph'] ~= nil then
context("\\emph{" .. text .. "}")
elseif cfg['bold'] ~= nil then
context("\\bold{" .. text .. "}")
else
context(text)
end
end
\stopluacode
% without that line there is no problem
\setupinteraction[state=start]
\defineenumeration[enu][text=Enu]
\unprotect
\def\mc{\dosingleempty\do_my_command}
\def\do_my_command[#1]#2{%
\iffirstargument{%
\ctxlua{userdata.my_command('#1', [==[#2]==])}%
}\else {%
\ctxlua{userdata.my_command('', [==[#2]==])}%
}\fi
}
\protect
\starttext
% all the following works
\mc{foo} \mc[bold]{foo} \mc[emph]{foo}
\startenu[title=Some]
\stopenu
% this breaks
\startenu[title=Some \mc{foo}]
\stopenu
\stoptext
```
The compilation fails with:
```
tex error       > tex error on line 41 in file ./test.tex: Use of \do_my_command doesn't match its definition
```
Best,
Gerion
[1] https://tex.stackexchange.com/a/55778
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