Best,<= /div>

Lukas

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

=0A=
=0A=

On 18 Jun 2020, at 10:27, Luka= s/ConTeXt <lpr.context@em= ail.cz> wrote:

Hello,
I'm using Hans' macro suggested some ti= me 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\donoth= ing

\startluacode
   if= CONTEXTLMTXMODE =3D=3D 0 then
     &nb= sp; local d =3D tokens.defined
    &nbs= p;  local c =3D tokens.create

  &n= bsp;    function tokens.defined(s,b)
&= nbsp;         if b then
           &nb= sp;   return d(s)
     &= nbsp;     else
    =            return c= (s).cmd_name =3D=3D "undefined_cmd"
    &nbs= p;      end
   &nbs= p;   end
   end

   --

   local defined= =3D tokens.defined

   for _, v in ipai= rs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing", "NonExisting" } = do
     print(string.format("\letterper= cent-12s", v), defined(v), defined(v, true), defined(v, false))
=    end
\stopluacode

&nb= sp;Aaa
\stoptext
----

gives:
"
MyMacro         false =   false   false
MyMacWithPars   fal= se   false   false
Undefined   &nbs= p;   false   false   false
DoN= othing       false   false &= nbsp;false
NonExisting     false   = false   false
"

IOW, I'm not able to= determine whether a control sequence has not been defined (or has \undefi= ned 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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