From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.devel Subject: first-is (3 versions, Elisp hangup) (was: Re: we need *modularity* [last problem]) Date: Fri, 16 Aug 2024 11:35:23 +0200 Message-ID: <87bk1s4xpg.fsf_-_@dataswamp.org> References: <864j7qhup6.fsf@gnu.org> <87a5hi0yts.fsf@valhala.localdomain> <86y152ge0b.fsf@gnu.org> <86jzgjfwqp.fsf@gnu.org> <87sev78arx.fsf@gmail.com> <86le0z89u1.fsf@gnu.org> <87o75v87n1.fsf@gmail.com> <86frr786k7.fsf@gnu.org> <861q2q8e18.fsf@gnu.org> <87frr53sa8.fsf_-_@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33968"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:44wC3Hoi1oNVLlNBS/pUtkkq76g= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Aug 16 12:46:36 2024 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1seuTc-0008gI-DT for ged-emacs-devel@m.gmane-mx.org; Fri, 16 Aug 2024 12:46:36 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1seuTK-0008GY-Vq; Fri, 16 Aug 2024 06:46:19 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1setMs-0004Qf-JN for emacs-devel@gnu.org; Fri, 16 Aug 2024 05:35:34 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1setMq-0005NV-RO for emacs-devel@gnu.org; Fri, 16 Aug 2024 05:35:34 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1setMo-00064j-FW for emacs-devel@gnu.org; Fri, 16 Aug 2024 11:35:30 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: emacs-devel@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 16 Aug 2024 06:46:17 -0400 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." 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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:322803 Archived-At: Here is one example. How to check if a word starts with something? E.g., a "-" (not a dash anymore but a "hyphen-minus", haha) then that should denote something else, a line in this case, such situations. How do you check that? And it cannot break for data that is (not stringp), should just be nil then I was doing something else, now I did this instead. I'm sure you have a much better method that will make me look like a fool, but ... it is like this all the time with Elisp. Why isn't there just a (first-is THIS ALL) and it would not crash, just eval to nil on type incompatibilities, other than that it would work on arbitrary data? THIS could even be a predicate that would take FRST as the argument. Hey ... not bad! I should write that! See the problem? :P (defun elpat--first-is-3 (s str) (and (stringp s) (stringp str) (string= s (char-to-string (seq-first str))))) (defun elpat--first-is-2 (s str) (and (stringp s) (stringp str) (string= s (substring str 0 1)))) (defun elpat--first-is (s str) (and (cl-every #'stringp (list s str)) #1=(string-match s str) (zerop #1#))) ;; (elpat--first-is "s" "same") ;; (elpat--first-is-2 "s" "same") ;; (elpat--first-is-3 "s" "same") ;; (elpat--first-is "s" "lame") ;; (elpat--first-is-2 "s" "lame") ;; (elpat--first-is-3 "s" "lame") -- underground experts united https://dataswamp.org/~incal