I saw no answer to this one. Hopefully it just got lost.
Apologies to anyone who already got it.

Den fre 24 juni 2022 16:09BPJ <> skrev:

> I have a not-so-old "pseudo-writer" implemented as a filter which mostly
> injects  tons of raw markup into the document tree so that the output of
> the plain writer looks like my target format, returning a table of filters
> at the end like this
>
> ``````lua
> return {
>   {
>     Meta = get_config
>   },
>   {
>     SmallCaps = SmallCaps,
>     Str = Str
>   },
>   note_filter,
>   main_filter
> }
> ``````
>
> where `get_config` just extracts some info from the metadata and populates
> a table declared at the top of the script which the functions in the other
> filters refer to.
>
> Am I right that I in principle could convert this into a new style custom
> writer by removing the Meta filter, replacing `return {<filters>}` above
> with `local filters = {<filters>}` and adding the following at the bottom
> of the script?
>
> ``````lua
> function Writer (doc, opts)
>   get_config(doc.meta)
>   for _,filter in ipairs(filters) do
>     doc = doc:walk(filter)
>   end
>   doc.blocks = blocks
>   return pandoc.write(doc, 'plain', opts)
> ``````
>
> (This got me thinking: what if `walk` accepted one more argument which
> will be passed as an extra argument to the functions in the filters, which
> could be used to pass config and/or maintain state? It somehow feels more
> intuitive than defining a table outside the metadata handler which all
> handlers close around.)
>
> (BTW the main reason that the `note_filter` is separate is that it needs
> to be topdown because it counts and collects the notes, while `main_filter`
> needs to be bottomup because it sometimes relies on the content of elements
> already having been processed. I was very happy when I realized that this
> would work!)
>
>

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