Try removing the '--':

filters:
  -  pandoc-include

But you should have got an error, so I'm wondering whether you were
successfully including the defaults file (note that, unless you've set your
data directory to $HOME, it won't be searched for in $HOME/defaults). For
testing, I suggest putting it in the current directory.

On Fri, 11 Aug 2023 at 09:51, Guido Milanese <guido.milanese-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:

> I have successfully installed pandoc-include (
> https://pypi.org/project/pandoc-include/) and I run it calling the filter
> as usual:
>
> pandoc —filter=pandoc-include test.md -o test.pdf
>
> The filter is a python—panflute filter.
>
> The pandoc-include documentation suggests to add this item to the document
> header:
>
> pandoc-options:
>   - --filter=pandoc-include
>
> but it seems ineffective, since an explicit call of the filter in the
> command line is necessary.
>
> I also added to ${HOME}/defaults/defaults file this line:
>
> filters:
>   -  --pandoc-include
>
> but again nothing happens.
> I’m sure I’m missing some basic step, and I am grateful in advance for
> your kind help.
>
> guido (northern Italy)
> Disclaimer: I have already asked the same question in the pandoc-include
> discussione group.
>
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