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

18 Jun 2020


      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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