GNU bug report logs -
#47771
27.1; `Info-read-node-name` throws error during completion
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Reported by: Daniel Mendler <mail <at> daniel-mendler.de>
Date: Wed, 14 Apr 2021 12:54:02 UTC
Severity: minor
Tags: confirmed, fixed
Found in version 27.1
Fixed in version 28.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
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bug#47771
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(Wed, 14 Apr 2021 12:54:02 GMT)
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(Wed, 14 Apr 2021 12:54:02 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
The function `Info-read-node-name` uses the `Info-read-node-name-1`
completion table. The completion table calls `Info-find-file`, which may
throw a `user-error` "Info file ... does not exist". Icomplete (and many
other completion systems) makes the assumption that completion tables do
not fail. Furthermore, completion tables already have a mechanism to
report missing completions by returning nil and printing a message. The
issue can be reproduced as follows in emacs -Q:
1. M-x icomplete-mode
2. Press "C-h i"
3. Press "g" to run `Info-goto-node`
4. Enter "(boom)"
5. Move around with the cursor left to right or wait until the
`icomplete-post-command-hook` fails.
In order to fix the issue, the following patch can be applied:
diff --git a/info.el b/info-patched.el
index 3bed743..42a7fce 100644
--- a/info.el
+++ b/info-patched.el
@@ -1881,7 +1881,8 @@ See `completing-read' for a description of
arguments and usage."
(lambda (string pred action)
(complete-with-action
action
- (Info-build-node-completions (Info-find-file file1 nil t))
+ (let ((file2 (Info-find-file file1 'noerror t)))
+ (and file2 (Info-build-node-completions file2)))
string pred))
nodename predicate code))))
;; Otherwise use Info-read-node-completion-table.
Alternatively wrap the whole line by `ignore-errors`.
The downside of ignoring the error is that now the default completion
system error message becomes slightly less meaningful. It shows "No
matches" instead of "Info ... not found". In case it is desired to
retain the better error messages, a discussion is needed on how
completion tables could report their matching failure. Here it is
probably sufficient to demote the error to a message.
diff --git a/info.el b/info-patched.el
index 3bed743..c38abd7 100644
--- a/info.el
+++ b/info-patched.el
@@ -1881,7 +1881,8 @@ See `completing-read' for a description of
arguments and usage."
(lambda (string pred action)
(complete-with-action
action
- (Info-build-node-completions (Info-find-file file1 nil t))
+ (with-demoted-errors "%S"
+ (Info-build-node-completions (Info-find-file file1 nil t)))
string pred))
nodename predicate code))))
;; Otherwise use Info-read-node-completion-table.
In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5,
cairo version 1.16.0)
of 2021-02-09, modified by Debian built on 3df710f593d9
Repository revision: b0229d4bbaea7fcddffced393512c650212830db
Repository branch: deb/emacs/d/sid/master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)
Recent messages:
Mark set [2 times]
Auto-saving...done
Mark set [3 times]
next-line: End of buffer
Mark set
Icomplete mode enabled
Error in post-command-hook (icomplete-post-command-hook): (user-error
"Info file emacs does not exist")
Quit
Added tag(s) confirmed.
Request was from
Stefan Kangas <stefan <at> marxist.se>
to
control <at> debbugs.gnu.org
.
(Mon, 19 Apr 2021 09:10:02 GMT)
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Severity set to 'minor' from 'normal'
Request was from
Stefan Kangas <stefan <at> marxist.se>
to
control <at> debbugs.gnu.org
.
(Mon, 19 Apr 2021 09:10:02 GMT)
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Information forwarded
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bug-gnu-emacs <at> gnu.org
:
bug#47771
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emacs
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(Wed, 05 May 2021 15:00:02 GMT)
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Message #12 received at 47771 <at> debbugs.gnu.org (full text, mbox):
Daniel Mendler <mail <at> daniel-mendler.de> writes:
> 1. M-x icomplete-mode
> 2. Press "C-h i"
> 3. Press "g" to run `Info-goto-node`
> 4. Enter "(boom)"
> 5. Move around with the cursor left to right or wait until the
> `icomplete-post-command-hook` fails.
>
> In order to fix the issue, the following patch can be applied:
>
> diff --git a/info.el b/info-patched.el
> index 3bed743..42a7fce 100644
> --- a/info.el
> +++ b/info-patched.el
> @@ -1881,7 +1881,8 @@ See `completing-read' for a description of
> arguments and usage."
> (lambda (string pred action)
> (complete-with-action
> action
> - (Info-build-node-completions (Info-find-file file1 nil t))
> + (let ((file2 (Info-find-file file1 'noerror t)))
> + (and file2 (Info-build-node-completions file2)))
Thanks; applied to Emacs 28 (with some minor changes).
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
Added tag(s) fixed.
Request was from
Lars Ingebrigtsen <larsi <at> gnus.org>
to
control <at> debbugs.gnu.org
.
(Wed, 05 May 2021 15:00:03 GMT)
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bug marked as fixed in version 28.1, send any further explanations to
47771 <at> debbugs.gnu.org and Daniel Mendler <mail <at> daniel-mendler.de>
Request was from
Lars Ingebrigtsen <larsi <at> gnus.org>
to
control <at> debbugs.gnu.org
.
(Wed, 05 May 2021 15:00:03 GMT)
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bug#47771
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(Wed, 05 May 2021 15:49:02 GMT)
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Message #19 received at 47771 <at> debbugs.gnu.org (full text, mbox):
On 5/5/21 4:59 PM, Lars Ingebrigtsen wrote:
> Thanks; applied to Emacs 28 (with some minor changes).
Thank you. There is one additional issue I missed in the bug report. If
you call `Info-build-node-completions` with a file without info tags, it
will also throw an error. So maybe it would be better to wrap
`(Info-build-node-completions (Info-find-file file1 nil t))` with
`ignore-errors`?
Daniel
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bug#47771
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(Thu, 06 May 2021 09:27:02 GMT)
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Message #22 received at 47771 <at> debbugs.gnu.org (full text, mbox):
Daniel Mendler <mail <at> daniel-mendler.de> writes:
> Thank you. There is one additional issue I missed in the bug report. If
> you call `Info-build-node-completions` with a file without info tags, it
> will also throw an error. So maybe it would be better to wrap
> `(Info-build-node-completions (Info-find-file file1 nil t))` with
> `ignore-errors`?
Slapping an `ignore-errors' around all that code feels a bit excessive
(it makes debugging hard), so I've instead made
`Info-build-node-completions' a bit more resilient -- it'll catch errors
from `Info-goto-node' instead.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
Information forwarded
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bug#47771
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emacs
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(Thu, 06 May 2021 09:43:02 GMT)
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Message #25 received at 47771 <at> debbugs.gnu.org (full text, mbox):
On 5/6/21 11:26 AM, Lars Ingebrigtsen wrote:
> Slapping an `ignore-errors' around all that code feels a bit excessive
> (it makes debugging hard), so I've instead made
> `Info-build-node-completions' a bit more resilient -- it'll catch errors
> from `Info-goto-node' instead.
I agree with you, the approach you took is better than the
`ignore-errors` sledgehammer. For the same reasons my initial proposal
was to pass noerror to `Info-find-file`. Thank you for applying the fixes!
Daniel
bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
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(Thu, 03 Jun 2021 11:24:10 GMT)
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This bug report was last modified 2 years and 324 days ago.
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