Re: Syntax for specifying a command in git config

Jeff King [off-list ref] writes:

quoted

Obviously this is not a *huge* deal, but it is a minor annoyance. I'm
wondering if it would be possible to add a new syntax to config options like
this. For example,

    [sendemail]
            smtpServer = !msmtp

The leading ! character says "the following value is a command that should
be looked up in PATH". This is congruent with alias definitions, where the
leading ! means to run the following value as a command directly instead of
as a git subcommand.

This also is unambiguous since server hostnames will never begin with a !
character.

IMHO this is a good path forward. There's a thread from a few months ago
which talks about this idea:

  https://lore.kernel.org/git/YCvotU6KVruFuf9%2F@coredump.intra.peff.net/ (local)

There's some back and forth, and I'm not sure if I convinced Junio in
the end. But certainly a patch would be a good way to restart the
conversation. :)

The argument is not just about configuration but applies equally to
its command line argument "--smtp-server=<what>", right?  I think it
makes sense in both of these places.  I further wonder if we should
allow not just a single token, but supplying an initial few arguments,
too, e.g.

	git send-email --smtp-server="/usr/bin/env msmtp"
	git send-email --smtp-server="!my-msa --emulate-sendmail"

Thanks.