From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Tino Calancha Newsgroups: gmane.emacs.bugs Subject: bug#21782: 25.0.50; New functions nfront/front Date: Fri, 30 Oct 2015 10:25:31 +0900 (JST) Message-ID: References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="1468197610-1087738362-1446168331=:10242" X-Trace: ger.gmane.org 1446168202 24782 80.91.229.3 (30 Oct 2015 01:23:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 30 Oct 2015 01:23:22 +0000 (UTC) Cc: Artur Malabarba To: 21782@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Oct 30 02:23:12 2015 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZryPO-0006FG-Kc for geb-bug-gnu-emacs@m.gmane.org; Fri, 30 Oct 2015 02:23:10 +0100 Original-Received: from localhost ([::1]:47923 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZryPN-0005WS-Pc for geb-bug-gnu-emacs@m.gmane.org; Thu, 29 Oct 2015 21:23:09 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35006) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZryPJ-0005WG-Om for bug-gnu-emacs@gnu.org; Thu, 29 Oct 2015 21:23:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZryPG-0000k0-Ij for bug-gnu-emacs@gnu.org; Thu, 29 Oct 2015 21:23:05 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:54268) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZryPG-0000jw-Ep for bug-gnu-emacs@gnu.org; Thu, 29 Oct 2015 21:23:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1ZryPG-0002zP-1o for bug-gnu-emacs@gnu.org; Thu, 29 Oct 2015 21:23:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Tino Calancha Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 30 Oct 2015 01:23:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 21782 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 21782-submit@debbugs.gnu.org id=B21782.144616814711430 (code B ref 21782); Fri, 30 Oct 2015 01:23:01 +0000 Original-Received: (at 21782) by debbugs.gnu.org; 30 Oct 2015 01:22:27 +0000 Original-Received: from localhost ([127.0.0.1]:44976 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1ZryOg-0002yH-Jm for submit@debbugs.gnu.org; Thu, 29 Oct 2015 21:22:27 -0400 Original-Received: from calancha-ilc.kek.jp ([130.87.234.234]:42441) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1ZryOd-0002y7-UF for 21782@debbugs.gnu.org; Thu, 29 Oct 2015 21:22:25 -0400 Original-Received: by calancha-ilc.kek.jp (Postfix, from userid 500) id 3418A9250; Fri, 30 Oct 2015 10:25:31 +0900 (JST) Original-Received: from localhost (localhost [127.0.0.1]) by calancha-ilc.kek.jp (Postfix) with ESMTP id 1D6209229; Fri, 30 Oct 2015 10:25:31 +0900 (JST) X-X-Sender: calancha@calancha-ilc.kek.jp In-Reply-To: User-Agent: Alpine 2.20 (LRH 67 2015-01-07) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:108160 Archived-At: --1468197610-1087738362-1446168331=:10242 Content-Type: text/plain; charset=US-ASCII; format=flowed > I think this is already available in core as seq-take, from the seq package. Thank you, you are right. Indeed, I found seq-take very nice: its more general because apply to sequences. There is one small difference: seq-take has no optional arguments. In addition, seq.el need to be loaded by the user. Yeah, not a big deal, but IMO such fundamental operation on a list as nfront implement, deserve to be available at the starting of the session. Putting a dedicated function in subr.el we save to load many stuff from seq.el that maybe we dont need. I would like nfront/front would behave as nbutlast/butlast concerning the N argument: *) N nil giving same output as N = 1. *) N <= 0 return the full list. (I choose the name of the function to somehow reflect such symmetry). I have modified my patch to accomplish such behaviour. With the new patch (let ((ltest '(1 2 3 4 5 6))) (nbutlast ltest nil)) (1 2 3 4 5) (let ((ltest '(1 2 3 4 5 6))) (nfront ltest nil)) (1) (require 'seq) (let ((ltest '(1 2 3 4 5 6))) (seq-take ltest nil)); error: second argument is not optional (let ((ltest '(1 2 3 4 5 6))) (nbutlast ltest 0)) (1 2 3 4 5 6) (let ((ltest '(1 2 3 4 5 6))) (nfront ltest 0)) (1 2 3 4 5 6) (let ((ltest '(1 2 3 4 5 6))) (seq-take ltest 0)) nil (let ((ltest '(1 2 3 4 5 6))) (nbutlast ltest -1)) (1 2 3 4 5 6) (let ((ltest '(1 2 3 4 5 6))) (nfront ltest -1)) (1 2 3 4 5 6) (let ((ltest '(1 2 3 4 5 6))) (seq-take ltest -1)) nil (let ((ltest '(1 2 3 4 5 6))) (nbutlast ltest 20)) nil (let ((ltest '(1 2 3 4 5 6))) (nfront ltest 20)) (1 2 3 4 5 6) (let ((ltest '(1 2 3 4 5 6))) (seq-take ltest 20)) (1 2 3 4 5 6) --1468197610-1087738362-1446168331=:10242 Content-Type: text/plain; charset=US-ASCII; name=subr-2.patch Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: attachment; filename=subr-2.patch ZGlmZiAtLWdpdCBhL2xpc3Avc3Vici5lbCBiL2xpc3Avc3Vici5lbA0KaW5k ZXggZWE5MjZhZS4uZWY3MDVlYiAxMDA2NDQNCi0tLSBhL2xpc3Avc3Vici5l bA0KKysrIGIvbGlzcC9zdWJyLmVsDQpAQCAtMzkxLDEzICszOTEsMTUgQEAg bGFzdA0KIChkZWZ1biBidXRsYXN0IChsaXN0ICZvcHRpb25hbCBuKQ0KICAg IlJldHVybiBhIGNvcHkgb2YgTElTVCB3aXRoIHRoZSBsYXN0IE4gZWxlbWVu dHMgcmVtb3ZlZC4NCiBJZiBOIGlzIG9taXR0ZWQgb3IgbmlsLCB0aGUgbGFz dCBlbGVtZW50IGlzIHJlbW92ZWQgZnJvbSB0aGUNCi1jb3B5LiINCitjb3B5 Lg0KK1doZW4gTiBpcyA8PSAwIExJU1QgaXMgcmV0dXJuZWQuIg0KICAgKGlm IChhbmQgbiAoPD0gbiAwKSkgbGlzdA0KICAgICAobmJ1dGxhc3QgKGNvcHkt c2VxdWVuY2UgbGlzdCkgbikpKQ0KIA0KIChkZWZ1biBuYnV0bGFzdCAobGlz dCAmb3B0aW9uYWwgbikNCiAgICJNb2RpZmllcyBMSVNUIHRvIHJlbW92ZSB0 aGUgbGFzdCBOIGVsZW1lbnRzLg0KLUlmIE4gaXMgb21pdHRlZCBvciBuaWws IHJlbW92ZSB0aGUgbGFzdCBlbGVtZW50LiINCitJZiBOIGlzIG9taXR0ZWQg b3IgbmlsLCByZW1vdmUgdGhlIGxhc3QgZWxlbWVudC4NCitXaGVuIE4gaXMg PD0gMCBMSVNUIGlzIHJldHVybmVkIHVubW9kaWZpZWQuIg0KICAgKGxldCAo KG0gKGxlbmd0aCBsaXN0KSkpDQogICAgIChvciBuIChzZXRxIG4gMSkpDQog ICAgIChhbmQgKDwgbiBtKQ0KQEAgLTQwNSw2ICs0MDcsMjEgQEAgbmJ1dGxh c3QNCiAJICAgKGlmICg+IG4gMCkgKHNldGNkciAobnRoY2RyICgtICgxLSBt KSBuKSBsaXN0KSBuaWwpKQ0KIAkgICBsaXN0KSkpKQ0KIA0KKyhkZWZ1biBm cm9udChsaXN0ICZvcHRpb25hbCBuKQ0KKyAgIlJldHVybiBhIGNvcHkgb2Yg TElTVCB3aXRoIGp1c3QgdGhlIGZpcnN0IE4gZWxlbWVudHMuDQorSWYgaXMg b21pdHRlZCBvciBuaWwgY29weSBqdXN0IHRoZSBmaXJzdCBlbGVtZW50DQor V2hlbiBOIGlzIDw9IDAgdGhlIGZ1bGwgbGlzdCBpcyBjb3BpZWQuIg0KKyAg KGlmIChhbmQgbiAoPD0gbiAwKSkgbGlzdA0KKyAgICAobmZyb250IChjb3B5 LXNlcXVlbmNlIGxpc3QpIG4pKSkNCisNCisoZGVmdW4gbmZyb250KGxpc3Qg Jm9wdGlvbmFsIG4pDQorICAiTW9kaWZpZWQgTElTVCB0byByZW1vdmUgYWxs IGVsZW1lbnRzIGJ1dCB0aGUgZmlyc3QgTi4NCitJZiBOIGlzIG9taXR0ZWQg b3IgbmlsIHJlbW92ZSBhbGwgYnV0IHRoZSBmaXJzdCBlbGVtZW50DQorV2hl biBOIGlzIDw9IDAgTElTVCBpcyByZXR1cm5lZCB1bm1vZGlmaWVkLiINCisg IChvciBuIChzZXRxIG4gMSkpDQorICAoaWYgKDw9IG4gMCkgbGlzdA0KKyAg ICAobnJldmVyc2UgKGxhc3QgKG5yZXZlcnNlIGxpc3QpIG4pKSkpDQorDQog KGRlZnVuIHplcm9wIChudW1iZXIpDQogICAiUmV0dXJuIHQgaWYgTlVNQkVS IGlzIHplcm8uIg0KICAgOzsgVXNlZCB0byBiZSBpbiBDLCBidXQgaXQncyBw b2ludGxlc3Mgc2luY2UgKD0gMCBuKSBpcyBmYXN0ZXIgYW55d2F5IGJlY2F1 c2UNCg== --1468197610-1087738362-1446168331=:10242--