FEEDBACK WANTED: Re: YAML metadata files' override order in a single command line

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

It is as you discovered: the first one wins, currently.
This is somewhat arbitrary and could be changed.

Using foldl1 instead of foldr1 in line 230 of Text.Pandoc.App
would give the other behavior.

The change allowing multiple metadata files is not yet in
any released version, so it would be easy to change this.
I'd welcome feedback from people.

consistency is good, so we should also ask:

- which takes precedence if you do
  --metadata foo=1 --metadata foo=2
  on the command line?

- which takes precedence if you have two YAML metadata blocks
  in a markdown file, and they set the same field?

K4zuki <k.yamamoto.08136891-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Hello,
>
> I have a question regarding multiple yaml input in one command line.
>
> I have two yaml metadata files: system/config.yaml and user/config.yaml. 
> They have some overlaps in entries.
> I tested the following command with expectation that user/config.yaml 
> overrides system/config.yaml:
>
> pandoc -s -t markdown system/config.yaml user/config.yaml
>
>
> but in fact system/config.yaml wins. What system/config.yaml does not have 
> is merged as expected (and vice versa).
>
> So the question is when multiple yaml with entry overlap given in a single 
> command line, what kind of override order is applied?
>
> Thanks && Regards,
> Kazuki