Re: help with lua filter "Replacing placeholders with their metadata value"

[BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

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Den tors 12 jan. 2023 18:00Howard Borchew <hborchew-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> Hello,
>
> There is an example lua filter in pandoc.org called:
> "Replacing placeholders with their metadata value"
>
> This does exactly what I need but for one exception:
> If I set a metadata value on the pandoc command line
> with --metadata=KEY[:VALUE]
> then the placeholder is not replaced with anything and not the command
> line VALUE
> using this example lua filter.
>

Probably because if you set the metadata value on the command line it is
just a raw string, not a list of inlines as the filter and pandoc.Span
expect.



> Is there an easy fix for this?
>

Set the variables in a metadata block in the document or in a metadata file.

<https://pandoc.org/MANUAL.html#option--metadata-file>



> I am pasting the example from https://pandoc.org/lua-filters.html below.
>
> Thanks,
> Howard
> ----
> local vars = {}
>
> function get_vars (meta)
>   for k, v in pairs(meta) do
>     if pandoc.utils.type(v) == 'Inlines' then
>       vars["%" .. k .. "%"] = {table.unpack(v)}
>     end
>   end
> end
>

It could be expanded to wrap a raw string value in a Str and an Inlines,
and to convert a Blocks value to an Inlines with
pandoc.utils.blocks_to_inlines.



> function replace (el)
>   if vars[el.text] then
>     return pandoc.Span(vars[el.text])
>   else
>     return el
>   end
> end
>
> return {{Meta = get_vars}, {Str = replace}}
>

My take is to use a Code or CodeBlock with class .var and the variable name
as text. More to type but more robust.

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