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

[BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I have written a README for my filter (both included in the attached zip
file) which should answer most questions about my approach.


Den fre 13 jan. 2023 01:14Howard Borchew <hborchew-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

>
>
> On Thursday, January 12, 2023 at 9:36:04 AM UTC-8 BPJ wrote:
>
>
> Den tors 12 jan. 2023 18:00Howard Borchew <hbor...-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>
>
> The document is under revision control and I want to change placeholders
> from the command line at the time of running pandoc.
>
>
> 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.
>
>
> I don't quite get your suggestion: I presume the list gets to get_vars
> through the argument meta and meta is iterated over in key(k)/value(v)
> pairs in the for-do loop.
> Only when passing the value(v) type=="Inlines" check does a placeholder
> %key% and value(v) get added to the vars table.
> While iterating over pairs(meta) would the for-do loop encounter the
> --metadata KEY[VALUE] items that were set by the command line switch?
> Is it then simply a matter to pass that type check and add it to vars
> (type is raw string keyword?).
>
>
>
> 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.
>
>
> If I can get the command line KEY[VALUE] table items into vars above, I
> don't think this replace function would need to change.
>
> Can you show some examples what you have in mind? Code or CodeBlock?
>
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