Juri Linkov <juri@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 77755) by debbugs.gnu.org; 15 Apr 2025 18:22:44 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Apr 15 14:22:44 2025 Received: from localhost ([127.0.0.1]:55361 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1u4kvi-0007q5-T3 for submit <at> debbugs.gnu.org; Tue, 15 Apr 2025 14:22:43 -0400 Received: from relay6-d.mail.gandi.net ([217.70.183.198]:44873) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <juri@HIDDEN>) id 1u4kvf-0007oR-Vd; Tue, 15 Apr 2025 14:22:41 -0400 Received: by mail.gandi.net (Postfix) with ESMTPSA id 2C6C743297; Tue, 15 Apr 2025 18:22:30 +0000 (UTC) From: Juri Linkov <juri@HIDDEN> To: Jens Schmidt <jschmidt4gnu@HIDDEN> Subject: Re: bug#77755: 31.0.50; Synchronous man does not handle error cases properly In-Reply-To: <f17c41ab-25a1-4a94-b628-9c7b10e76db1@HIDDEN> Organization: LINKOV.NET References: <f17c41ab-25a1-4a94-b628-9c7b10e76db1@HIDDEN> Date: Tue, 15 Apr 2025 21:21:25 +0300 Message-ID: <87r01tb80q.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/31.0.50 (x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain X-GND-State: clean X-GND-Score: 0 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvvdegudelucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecunecujfgurhephffvvefujghofhffkfgfgggtsehttdertddtredtnecuhfhrohhmpefluhhrihcunfhinhhkohhvuceojhhurhhisehlihhnkhhovhdrnhgvtheqnecuggftrfgrthhtvghrnhepffegteefveelhfeljeefueehieduiedtfffhuddtkeeffffghfevheetgeeukeehnecukfhppeeluddruddvledruddthedruddujeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeluddruddvledruddthedruddujedphhgvlhhopehmrghilhdrghgrnhguihdrnhgvthdpmhgrihhlfhhrohhmpehjuhhriheslhhinhhkohhvrdhnvghtpdhnsggprhgtphhtthhopeefpdhrtghpthhtoheptghonhhtrhholhesuggvsggsuhhgshdrghhnuhdrohhrghdprhgtphhtthhopeejjeejheehseguvggssghughhsrdhgnhhurdhorhhgpdhrtghpthhtohepjhhstghhmhhiughtgehgnhhusehvohgurghfohhnvghmrghilhdruggv X-GND-Sasl: juri@HIDDEN X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 77755 Cc: 77755 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) close 77755 31.0.50 thanks > The attached tentative patch would fix both issues. > > What do you think? Thanks, everything looks correct, so I pushed your patch.
bug-gnu-emacs@HIDDEN:bug#77755; Package emacs.
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Subject: 31.0.50; Synchronous man does not handle error cases properly
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This is about some deficiencies with the user option
`Man-prefer-synchronous-call', which got added in Emacs 30. So it is in
fact also a bug in Emacs 30. (Thanks to Sebastian for adding that new
option, prior to Emacs 30 I have been using my private hacks to get
synchronous man page invocations.)
Anyway, when using a non-nil value for that option, some edge/error
cases behave awkwardly:
1. ./src/emacs -Q --eval '(setq Man-prefer-synchronous-call t)'
M-x man RET foobarbaz RET
Results in the error "Can't find the foobarbaz manpage" (OK) with the
minibuffer window being selected (not OK).
The minibuffer being selected is IMO a result of the following form
from function `Man-bgproc-sentinel':
(let ((old-window (old-selected-window)))
(when (window-live-p old-window)
(select-window old-window)))
IIUC, that form (or its predecessor) got added by Juri in bug#38164,
commit 611b85b6 to keep the minibuffer selected when an async `man'
fails at the time when the user is operating in the minibuffer.
Unfortunately, that hack ensures that the minibuffer is *always*
selected if a synchronous `man' fails.
2. ./src/emacs -Q --eval '(setq Man-prefer-synchronous-call t)'
M-x man RET -k foobarbaz RET
Results in the error "Can't find the k foobarbaz manpage" (not OK),
again with the minibuffer window being selected (not OK).
With async `man' this results in the error message "-k foobarbaz: no
matches", which I consider OK.
Here the problem is IMO that the following branch to detect failing
"man -k" calls in function `Man-bgproc-sentinel':
((and (string-match "\\(\\`\\|\\s-\\)-k\\s-" Man-arguments)
(eq (process-status process) 'exit)
(= (process-exit-status process) 0)
(= (point-min) (point-max)))
(setq message (format "%s: no matches" Man-arguments)
delete-buff t))
never gets selected in the synchronous case since the `(eq
(process-status process) 'exit)' form always evaluates to nil for
that case.
The attached tentative patch would fix both issues.
What do you think?
In GNU Emacs 31.0.50 (build 25, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.16.0) of 2025-04-11 built on sappc2
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--------------rNvXDK01HzA0Bi9EbCrwVim0--
Jens Schmidt <jschmidt4gnu@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#77755; Package emacs.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.