Re: Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

[Hans Hagen <j.hagen@xs4all.nl>]

On 6/18/2020 10:27 AM, Lukas/ConTeXt 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
as you updated, it's just:

   \startluacode
     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


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                                           Hans Hagen | PRAGMA ADE
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