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From: raingloom <raingloom@riseup.net>
Subject: bug#38529: Make --pure the default for `guix environment'?
Date: Mon, 30 Dec 2019 18:27:17 +0100
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>, "Thompson,
 David" <dthompson2@worcester.edu>
Cc: Pierre Neidhardt <mail@ambrevar.xyz>, 38529@debbugs.gnu.org

On Tue, 2019-12-10 at 18:16 +0100, Ludovic Courtès wrote:
> As for ‘--ad-hoc’: making it the default is technically easy.  The
> difficulty is to come up with a nice transition/deprecation mechanism
> so
> that we don’t break everyone’s script overnight.
> 
> Ideas on how to achieve it are welcome!
> 
> Thanks,
> Ludo’.
> 
> 

Why not make it fully explicit, without either being the default?
It would make script more readable too.

Then the deprecation is as easy as printing a warning when the
invocation relies on the default.

For example `guix environment hello` would become `guix environment --
inputs-of hello`. Not using `--inputs-of` would print something like
"warning: implicit --inputs-of is deprecated".