From: Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: [External] : Re: Appending lists
Date: Mon, 21 Jun 2021 01:04:12 +0200 [thread overview]
Message-ID: <87eecwf89f.fsf@zoho.eu> (raw)
In-Reply-To: jwvzgvk19dw.fsf-monnier+emacs@gnu.org
Stefan Monnier via Users list for the GNU Emacs text editor wrote:
>> might as well be
>>
>> (nconc (list
>> '("\\.bal\\'" . balance-mode)
>> '("\\.grm\\'" . sml-mode)
>> '("\\.lu\\'" . lua-mode)
>> '("\\.nqp\\'" . perl-mode)
>> '("\\.php\\'" . html-mode)
>> '("\\.pic\\'" . nroff-mode)
>> '("\\.pl\\'" . prolog-mode)
>> '("\\.sed\\'" . conf-mode)
>> '("\\.service\\'" . conf-mode)
>> '("\\.tex\\'" . latex-mode)
>> '("\\.xr\\'" . conf-xdefaults-mode)
>> '("*" . text-mode) )
>> auto-mode-alist)
>
> Here `nconc` is a safe replace for `append` because indeed
> the first arg is a list you just constructed by `list` so
> you know for sure it's not shared with anything else.
Right.
> But the second above code is just an expensive no-op because
> your `nconc` will modify its first argument and not its
> second
Right!
> Here's another way you could write the code:
>
> (setq auto-mode-alist
> `(("\\.bal\\'" . balance-mode)
> ("\\.grm\\'" . sml-mode)
> ("\\.lu\\'" . lua-mode)
> ("\\.nqp\\'" . perl-mode)
> ("\\.php\\'" . html-mode)
> ("\\.pic\\'" . nroff-mode)
> ("\\.pl\\'" . prolog-mode)
> ("\\.sed\\'" . conf-mode)
> ("\\.service\\'" . conf-mode)
> ("\\.tex\\'" . latex-mode)
> ("\\.xr\\'" . conf-xdefaults-mode)
> ("*" . text-mode)
> ,@auto-mode-alist))
Hm, isn't that the coolest one by far?
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2021-06-20 23:04 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 3:18 Appending lists Drew Adams
2021-06-17 7:48 ` tomas
2021-06-18 23:38 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-18 23:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-19 6:57 ` tomas
2021-06-19 21:31 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-19 22:07 ` [External] : " Drew Adams
2021-06-20 19:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 19:58 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 20:10 ` Jean Louis
2021-06-20 20:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 19:59 ` Jean Louis
2021-06-20 20:22 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 20:42 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 20:49 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 21:49 ` Jean Louis
2021-06-20 22:54 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 23:30 ` Jean Louis
2021-06-21 0:29 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-20 21:46 ` Jean Louis
2021-06-20 22:09 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-06-20 23:04 ` Emanuel Berg via Users list for the GNU Emacs text editor [this message]
2021-06-20 23:10 ` Emanuel Berg via Users list for the GNU Emacs text editor
-- strict thread matches above, loose matches on Subject: below --
2021-06-16 14:16 Drew Adams
2021-06-16 17:03 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-16 18:00 ` Drew Adams
2021-06-14 16:36 Pierpaolo Bernardi
2021-06-14 16:40 ` henri-biard
2021-06-14 18:21 ` Alexandr Vityazev
2021-06-15 0:46 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-15 8:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-15 9:18 ` tomas
2021-06-16 1:11 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-16 7:28 ` tomas
2021-06-16 16:42 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-16 16:55 ` [External] : " Drew Adams
2021-06-16 17:06 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-16 17:54 ` Drew Adams
2021-06-16 23:49 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-17 7:54 ` tomas
2021-06-18 23:55 ` Emanuel Berg via Users list for the GNU Emacs text editor
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