From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Daniel Brooks Newsgroups: gmane.emacs.devel Subject: lengths and other stuff Date: Sun, 27 Dec 2020 15:05:59 -0800 Message-ID: <8735zqsvc8.fsf_-_@db48x.net> References: <87o8ivumn5.fsf@telefonica.net> <87czyxuxw6.fsf@db48x.net> <87y2hlt82w.fsf@db48x.net> <87lfdlvsw4.fsf@logand.com> <83h7o8ncly.fsf@gnu.org> <87pn2wudab.fsf@db48x.net> <87mty0c3m1.fsf@gnus.org> <83czywnb86.fsf@gnu.org> <87im8ob707.fsf@gnus.org> <87eejcb6nx.fsf@gnus.org> <875z4ob5c9.fsf@gnus.org> <87a6u09nkq.fsf@gnus.org> <875z4o9jdg.fsf@gnus.org> <87r1nb8yoj.fsf@gnus.org> <83blefkte2.fsf@gnu.org> <87h7o69aa8.fsf@gnus.org> <87pn2uq3ty.fsf@logand.com> <87ft3qq2kz.fsf@logand.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14281"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) Cc: "Alfred M. 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:261939 Archived-At: Tomas Hlavaty writes: > On Sun 27 Dec 2020 at 17:49, "Alfred M. Szmidt" wrote: >> However, if somebody writes such code, it is almost trivial to fix >> it with search and replace: >> >> "(=3D (length" -> "(length=3D" >> "(< (length" -> "(length<" >> "(> (length" -> "(length>" >> "(/=3D (length" -> "(length/=3D" >> "(<=3D (length" -> "(length<=3D" >> "(>=3D (length" -> "(length>=3D" >> >> (plus extra closing paren) >> >> Users will assume that these length>=3D hacks will make their code >> magically better, when they just hide a problematic form -- doing a >> possibly complicated operation inside a predicate call. > > It will make their code better. I do not see any magic there, it is > pretty simple and logical. > > Do you have some other solution on mind? Some of them can no doubt be replaced by multiple-value-bind and other such things. This one from ido.el:1518, for example: (if (and (listp (car l)) (> (length (car l)) 2) (let ((dir (car (car l))) (time (car (cdr (car l)))) (files (cdr (cdr (car l))))) could be (multiple-value-bind (dir time files) (car l) =E2=80=A6). But those kinds of improvements take a lot more thought about each occurrence. Incidentally, I find it hard to believe that someone typed all of that out without at least using cadar and cddar. db48x