Re: [NTG-context] cld questions

6 Sep 2021


      On 9/6/2021 6:20 PM, Henning Hraban Ramm via ntg-context wrote:
...
Another question:
I think I understood the need for function arguments.
My macro, defined with interfaces.implement, works while I call "Image" below,
but if I call "ClippedImage" (one level of indirection more), I get:
"""
tex error       > tex error on line 28 in file virtual://page.nopage.1: Missing { inserted
...(no helpful output here)...
A left brace was mandatory here, so I've put one in.
"""
I can’t imagine where to put that brace.
function Image(Width, Height, filename)
  context.externalfigure(
      { filename },
      {
      	width = todimen(Width),
      }
  )
end
function ClippedImage(Width, Height, filename)
  context.clip(
      {
      	width = todimen(Width),
      	height = todimen(Height),
      },
      Image(Width, Height, filename)
function() Image(Width, Height, filename) end
...
)
end
Am 05.09.2021 um 16:27 schrieb Henning Hraban Ramm via ntg-context :
...
...
TeX:
\def\Something{1cm}
Lua:
context.Something()
yes (assuming you're in scope)
Then I’m out of scope.
\def is in my environment, directly before I load the Lua functions with \loadluafile.
How can I access the macros from the environment there?
...
...
2) The original interface of \MyFun had two optional parameters. I couldn’t find how to do that with interfaces.implement.
   cld-mkiv, p.151 (12.7) shows how to do lists or key=value, but not single optional args.
there is "optional"
and ... cld is not yet updated to lmtx in this respect so some newer features are missing
Must I then declare "string optional" etc.?
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