Re: [PATCH] git-contacts: Add recognition of Reported-by

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On Mon, Jul 24, 2017 at 12:29:04PM -0700, Junio C Hamano wrote:

> > There's already some prior art around trailers in the trailer.* config.
> > I wonder if it would make sense to claim a new key there, like:
> >
> >   git config trailer.Reported-by.autocc true
> >
> > If "Reported-by" is a trailer that your project uses, then there may be
> > some benefit to setting up other config related to it, and this would
> > mesh nicely. And then potentially other programs besides git-contacts
> > would want to respect that flag (perhaps send-email would even want to
> > do it itself; I think it already respects cc and s-o-b headers).
> 
> Sounds like a good suggestion.  But...
> 
> If I understand your proposal, the trailer stuff would still not
> care what value .autocc is set to while doing its own thing, but the
> programs that read the text file that the trailer can work on would
> pay attention to it, and they individually have to do so?  Perhaps
> there is a need for another mode "interpret-trailers" is told to run
> in, where it is given a text file with trailers in it and is told to
> show only the value that has .autocc bit on?  Alternatively, yield
> <key, value> pairs so that the user of the tool can further process
> the value differently depending on the key, or something?

Yeah, I don't think interpret-trailers is currently a useful tool for
looking at an extra config key like that. I'd expect it would need to be
extended, or a new tool added, or perhaps existing tools would need to
learn more about how trailers work (e.g., it would be nice if git-log
could do matching or even print them via %(trailer:reported-by)
placeholders or something). I think there's a lot of potential work in
that area.

Of course git-contacts (or send-email) _can_ just look look at all of
the trailer.*.autocc config and try to match those manually. But the
point of having trailer config, I think, is that we should stop doing
ad-hoc parsing and have a tool for manipulating and querying trailers.
If interpret-trailers isn't up to the task yet, I'd rather see work go
there.

But that (manual parsing) is basically how the current cc and s-o-b
trailers implemented inside of git-send-email, so I don't think it would
be the end of the world as a quick hack that could later be expanded to
use the trailer infrastructure.

-Peff



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