Why can you not simply use one of the doifundefined macro's? Something for
example:
\doifundefined{ExitStatus}{\gdef\ExitStatus{0}} % default to ok as in UNIX
dr. Hans van der Meer
> On 18 Jun 2020, at 10:27, Lukas/ConTeXt <lpr.cont...@email.cz> wrote:
>
> Hello,
> I'm using Hans' macro suggested some time before.
> I've just updated Ctx MkIV and my sample code:
>
> ----
> \starttext
> \def\MyMacro{Ahoj}
>
> \def\MyMacWithPars#1#2{Something}
>
> \def\Undefined{}
> \let\Undefined\undefined
>
> \def\DoNothing{}
> \let\DoNothing\donothing
>
> \startluacode
> if CONTEXTLMTXMODE == 0 then
> local d = tokens.defined
> local c = tokens.create
>
> function tokens.defined(s,b)
> if b then
> return d(s)
> else
> return c(s).cmd_name == "undefined_cmd"
> end
> end
> end
>
> --
>
> local defined = tokens.defined
>
> for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing",
> "NonExisting" } do
> print(string.format("\letterpercent-12s", v), defined(v), defined(v,
> true), defined(v, false))
> end
> \stopluacode
>
> Aaa
> \stoptext
> ----
>
> gives:
> "
> MyMacro false false false
> MyMacWithPars false false false
> Undefined false false false
> DoNothing false false false
> NonExisting false false false
> "
>
> IOW, I'm not able to determine whether a control sequence has not been
> defined (or has \undefined value) or not.
>
> Am I doing a trivial mistake or has anything changed?
>
> Thank you for patience...
>
> Lukas<IsMacDef3.log><IsMacDef3.mkiv><IsMacDef3.log_>___________________________________________________________________________________
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