Re: [PATCH v3 1/2] difftool: add a skeleton for the upcoming builtin

Johannes Schindelin [off-list ref] writes:

So the suggestion by both you and Peff, to use an environment variable,
which is either global, or requires the user to set it manually per
session, is simply not a good idea at all.

As I already said, I do not have a strong preference between config
and env.  I raised the env as a possible alternative that you can
think about its pros and cons, and as I already said, if you thought
and your concluded that config would work better for your needs,
that is fine by me.