From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philip Kaludercic Newsgroups: gmane.emacs.devel Subject: Re: Elisp threading macros Date: Wed, 28 Aug 2024 18:05:29 +0000 Message-ID: <87v7zksety.fsf@posteo.net> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1226"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Garklein Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Aug 28 20:06:34 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 1sjN3y-0000Af-4k for ged-emacs-devel@m.gmane-mx.org; Wed, 28 Aug 2024 20:06:34 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sjN39-0001uk-Hf; Wed, 28 Aug 2024 14:05:43 -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 1sjN33-0001ft-Rg for emacs-devel@gnu.org; Wed, 28 Aug 2024 14:05:39 -0400 Original-Received: from mout02.posteo.de ([185.67.36.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sjN31-0007Ft-Ek for emacs-devel@gnu.org; Wed, 28 Aug 2024 14:05:37 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 73346240103 for ; Wed, 28 Aug 2024 20:05:30 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1724868330; bh=TVZIIpeZ0VPEvbDamj3BrdOeX68jo8YmwQPD0h30jEU=; h=From:To:Cc:Subject:Autocrypt:OpenPGP:Date:Message-ID:MIME-Version: Content-Type:From; b=MFO1/vNsF2deOWvqhqQZ9EuRIvGFh6vw+L+6j5yOdS6KuQsX2qvxGF5zaMuifjyJt 8xSQmd7+DHpGDViIb9kneI3P0hghxQg4CLoNzp3ivLUHqolvSk0COBVNQ7SA5OYPb9 c/Nlfy4PlKCzNWCP8FS1SVpbTffKmBjTTQGOxC7Q7mpuJDUPGS1PC2Hlz8fa4Twoze IU1H0Icoi+qcoC5JoFyfSA4gEfa8pz0ftcC2+a2k7eJ1pinMaag4D7kR3tl3rpVgN5 +AfnQL9nEHCNUkDgRUPqfkQuUZYnS4z/f1Js4hCjGQrtn5cObHICtHCKn+t03hWEP7 YhDesmEW7ZOag== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4WvC4n6RCPz9rxF; Wed, 28 Aug 2024 20:05:29 +0200 (CEST) In-Reply-To: (Garklein's message of "Wed, 28 Aug 2024 10:08:05 -0400") Autocrypt: addr=philipk@posteo.net; keydata= mDMEZBBQQhYJKwYBBAHaRw8BAQdAHJuofBrfqFh12uQu0Yi7mrl525F28eTmwUDflFNmdui0QlBo aWxpcCBLYWx1ZGVyY2ljIChnZW5lcmF0ZWQgYnkgYXV0b2NyeXB0LmVsKSA8cGhpbGlwa0Bwb3N0 ZW8ubmV0PoiWBBMWCAA+FiEEDg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwMFCQHhM4AFCwkI BwIGFQoJCAsCBBYCAwECHgECF4AACgkQ8xYDWXahwulikAEA77hloUiSrXgFkUVJhlKBpLCHUjA0 mWZ9j9w5d08+jVwBAK6c4iGP7j+/PhbkxaEKa4V3MzIl7zJkcNNjHCXmvFcEuDgEZBBQQhIKKwYB BAGXVQEFAQEHQI5NLiLRjZy3OfSt1dhCmFyn+fN/QKELUYQetiaoe+MMAwEIB4h+BBgWCAAmFiEE Dg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwwFCQHhM4AACgkQ8xYDWXahwukm+wEA8cml4JpK NeAu65rg+auKrPOP6TP/4YWRCTIvuYDm0joBALw98AMz7/qMHvSCeU/hw9PL6u6R2EScxtpKnWof z4oM OpenPGP: id=7126E1DE2F0CE35C770BED01F2C3CC513DB89F66; url="https://keys.openpgp.org/vks/v1/by-fingerprint/7126E1DE2F0CE35C770BED01F2C3CC513DB89F66"; preference=signencrypt Received-SPF: pass client-ip=185.67.36.66; envelope-from=philipk@posteo.net; helo=mout02.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action 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:323160 Archived-At: Garklein writes: > Hello, > > Would it be possible to have the dash.el macros `->', `->>', `-->', > and `-some->' in subr-x.el? I find them to be really useful, and would > love to see them in the base language. > > I know that `thread-first' and `thread-last' exist, but I find that my > eyes can recognize `->' and `->>' much easier. `-->' is really nice > for more complex threading. This sounds more like a matter of habit. FWIW I find a symbol like ->> or --> very unusual for Elisp. All in all, there are not that many if I run this snippet (mapatoms (lambda (sym) (when (string-match-p (rx bos (+ (not alnum)) eos) (symbol-name sym)) (message "Note %S" sym)))) and most of the appear to be part of some DSL like rx, and not Lisp functions (in my case only 18 out of 57). > `-some->' is useful in cases like this: Can you explain what, ->>, --> and -some-> do generally? > > (let (foo (function-which-may-return-nil)) > (when foo > (bar foo))) > > which can be rewritten, much cleaner, as > > (-some-> foo function-which-may-return-nil bar) [citation needed] > Thank you, > Garklein > > -- Philip Kaludercic on peregrine