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

[Taco Hoekwater <taco@bittext.nl>]

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 <gerion.entrup@flump.de> 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
> <test.tex>___________________________________________________________________________________
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— 
Taco Hoekwater              E: taco@bittext.nl
genderfluid (all pronouns)


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