Re: cld questions

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

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 <ntg-context@ntg.nl>:
> 
>>> 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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