From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Subject: Re: Should mode commands be idempotent?
Date: Wed, 20 Sep 2017 21:11:59 -0400 [thread overview]
Message-ID: <jwvk20syi83.fsf-monnier+gmane.emacs.devel@gnu.org> (raw)
In-Reply-To: c849aeb9-2826-44b2-ad23-9a7c089c4bae@default
>> I'll return the question: when/why would a major-mode or a minor-mode
>> not want to be idempotent? Can you cite at least one example?
> I don't need to. There should be some reasons given for making
> a change, especially a change that attempt to restrict users,
> whether by tooling or convention.
Philip gave the reason in the first email: "it's generally expected that
mode commands (both major and minor) are reasonably idempotent".
Of course, we wouldn't decide on such a rule without weighing the pros
and cons. But given that he mentioned one pro, we'd need at the very
least one cons before deciding it's a bad idea (no matter how weak the
pro).
Hence my question again (which is already implicitly contained in
Philip's original message):
When/why would a major-mode or a minor-mode not want to be idempotent?
Can you cite at least one example?
And of course, no restriction of the sort discussed here would limit
what the end user can do (we can't technically impose such
a restriction, we can only declare it's bad style). In practice, such
a restriction would probably allow the user to do more things (because
he can now rely on the idempotency in his code): what you take on one
side, allows to give on the other.
Stefan
next prev parent reply other threads:[~2017-09-21 1:11 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 19:58 Should mode commands be idempotent? Philipp Stephani
2017-09-19 22:10 ` Clément Pit-Claudel
2017-09-19 22:29 ` Stefan Monnier
2017-09-20 7:24 ` Clément Pit-Claudel
2017-09-20 14:52 ` John Wiegley
2017-09-20 22:30 ` Stefan Monnier
2017-09-20 23:05 ` Drew Adams
2017-10-08 15:09 ` Philipp Stephani
2017-09-20 22:25 ` Stefan Monnier
2017-09-23 8:16 ` Clément Pit-Claudel
2017-09-23 14:17 ` Stefan Monnier
2017-09-23 20:37 ` Stefan Monnier
2017-09-19 22:58 ` Drew Adams
2017-09-20 3:10 ` Stefan Monnier
2017-09-20 17:52 ` Drew Adams
2017-09-21 1:11 ` Stefan Monnier [this message]
2017-09-21 5:22 ` Drew Adams
2017-09-21 18:28 ` Richard Stallman
[not found] ` <<9f11a3c6-b113-4bf6-9dab-f894b2ad77b5@default>
[not found] ` <<E1dv6D1-0006Jr-Fl@fencepost.gnu.org>
2017-09-22 15:54 ` Drew Adams
2017-09-23 0:39 ` Richard Stallman
2017-09-23 8:05 ` Clément Pit-Claudel
2017-09-24 17:26 ` Drew Adams
2017-09-25 7:03 ` Clément Pit-Claudel
2017-09-25 13:57 ` Drew Adams
2017-09-26 0:36 ` Stefan Monnier
2017-09-26 3:30 ` John Wiegley
2017-09-26 17:55 ` Drew Adams
2017-09-26 18:01 ` John Wiegley
2017-09-26 18:50 ` Drew Adams
2017-09-26 18:54 ` John Wiegley
2017-10-08 15:28 ` Philipp Stephani
2017-10-08 19:04 ` Stefan Monnier
2017-10-10 2:10 ` John Wiegley
2017-12-21 20:49 ` Philipp Stephani
2017-12-22 2:20 ` Stefan Monnier
2017-10-10 23:15 ` Herring, Davis
[not found] ` <<E1dvYUB-0007na-Mx@fencepost.gnu.org>
2017-09-24 17:26 ` Drew Adams
2017-09-25 22:06 ` Richard Stallman
2017-09-19 23:50 ` John Wiegley
2017-09-20 3:09 ` Stefan Monnier
2017-09-20 13:01 ` Richard Stallman
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