From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: scratch/backend-completion 9a62da21c2 1/2: Integrate Stefan suggestions but rename it to "external-completion.el" Date: Sat, 03 Dec 2022 19:31:08 -0500 Message-ID: References: <167007345844.23701.8454474119701440468@vcs2.savannah.gnu.org> <20221203131739.2A601C004BA@vcs2.savannah.gnu.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="19953"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: emacs-devel@gnu.org To: =?windows-1252?B?Sm/jbyBU4XZvcmE=?= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Dec 04 01:32:03 2022 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 1p1cvK-0004zC-25 for ged-emacs-devel@m.gmane-mx.org; Sun, 04 Dec 2022 01:32:02 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p1cuc-000801-2y; Sat, 03 Dec 2022 19:31:18 -0500 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 1p1cuY-0007zd-TH for emacs-devel@gnu.org; Sat, 03 Dec 2022 19:31:14 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p1cuX-0001td-B0 for emacs-devel@gnu.org; Sat, 03 Dec 2022 19:31:14 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 052B644163D; Sat, 3 Dec 2022 19:31:12 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 83FFD44148B; Sat, 3 Dec 2022 19:31:10 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1670113870; bh=XiOOF1t6ANwTRcnjUIUL85MqhrvAZDQyisBFUDmK68c=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=BK+BvuWjQCutSrat2WgnCvCFF2AA+cBBA/J/795KvxTM1JzL6C/Iv4d4/RUJrvAt0 6cyFaIgxyTbS6okR+RTGUT6RVfcnVIaso+SvIv36iy/w+A8/HGQCi6GZL8RUc7+NUU tY3e80WcrLLTzBQ+sj4Kq7Sb++A51CiUwod/ARHlwm47rmObVJvchwYdlra+xvA9v7 VICZAEnTFhHsrmkDebXuc7fmucRRswLDyPn9EaXnsVKCQ5aoxDUlaoFUg21jEnlbDc 3Vm5dPIfog7L/9Cz9yNu6QHsA5H40nqAuwzL2cBKYBeuHVtq79EGT+4tLdnddZaMM1 rNWxaSj5F+A4Q== Original-Received: from pastel (unknown [45.72.193.52]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 3612712044C; Sat, 3 Dec 2022 19:31:10 -0500 (EST) In-Reply-To: (=?windows-1252?Q?=22Jo=E3o_T=E1vora=22's?= message of "Sat, 3 Dec 2022 23:36:01 +0000") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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:300883 Archived-At: >> > +TRY-COMPLETION-FUNCTION is an poorly understood implementation detail. >> >> Not at all. It's a functionality that only makes sense for some UIs >> (not those based on the idea of selecting among a set of choices), and >> it tends to work better with more "primitive" completion styles (it >> asymptotically becomes useless the harder the completion style tries to >> find completions). > > I'm still confused, I need examples to understand this stuff, and I'm afraid E.g. for the completion table of ELisp commands the `try-completion` for the `partial-completion` style of "r-bu" might be "re-bu" because all the completion candidates of "r-bu" have an "e" right after the "r", so "re-bu" selects exactly the same set of candidates. Similarly for "di-hu" it may return "diff-hunk" because all the candidates have "ff" after the "di" and "nk" after the "-hu". This is the standard "TAB completion" behavior: instead of asking you to *select* a candidate it "types the text for you" (hence the name "completion") without trying to guess which candidate you're going to go for: its only "guess" is that your goal is somewhere among the candidates. For prefix completion, it works great. For completion styles like `flex`, it's rarely able to complete anything. Stefan