Re: issue embedding from Lua code

[Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>]

Pablo Rodriguez schrieb am 01.11.2019 um 08:20:
> Dear list,
>
> I have the following sample:
>
>      \setupinteraction[state=start]
>      \starttext
>      \startluacode
>      function document.special_attachment(reference)
>          year = reference:sub(7, 10)
>          attachment_url = "https://www.boe.es/buscar/pdf/" ..
>          year .. "/" .. reference .. "-consolidado.pdf"
>          return attachment_url
>      end
>      \stopluacode
>
>      \unexpanded\def\giveattachment#1{%
>          \cldcontext{document.special_attachment("#1")}}
>
>      \def\cE{BOE-A-1978-31229}
>
>      \attachment[file={\giveattachment{\cE}}, color=red]
>
>
> \attachment[file={https://www.boe.es/buscar/pdf/1978/BOE-A-1978-31229-consolidado.pdf},
>       color=blue]
>
>      \giveattachment{\cE}
>
>      \stoptext
>
> I don’t know why I do get the second attachment, but not the first one.
> Lua code seems to be fine (given the last command in the sample).
>
> Could anyone explain me what I’m doing wrong?
You try to pass a protected (\expanded\def) command to a argument of 
another command
which doesn't work: Remove \unexpanded and your output is as expected.

\def\giveattachment#1%
   {\cldcontext{document.special_attachment("#1")}}

or

\def\giveattachment
   {\cldcontext{document.special_attachment(tokens.scanners.string())}}

Wolfgang

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