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Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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From: Daniel Mendler <mail@HIDDEN>
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Date: Fri, 9 Apr 2021 22:35:28 +0200
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1. Start emacs -Q, evaluate the following code:
~~~
(defun test-boundaries ()
(interactive)
(let* ((contents (minibuffer-contents-no-properties))
(pt (max 0 (- (point) (minibuffer-prompt-end))))
(before (substring contents 0 pt))
(after (substring contents pt)))
(completion-boundaries before
minibuffer-completion-table
minibuffer-completion-predicate
after)))
(global-set-key (kbd "C-.") #'test-boundaries)
~~~
2. Press "C-x C-f"
3. Enter the path "~//"
4. Move the point between the slashes, "~/|/"
5. Press "C-."
The function `test-boundaries' should determine the completion
boundaries correctly. I assume that the function `completion-boundaries'
should never fail with an error. This bug is hard to trigger with
default completion but occurs more often with continuously updating
interactive completion systems like "Vertico", when entering some path
and moving the point around.
I've got confirmation that the bug is still present in Emacs 28, but I
have not tested this myself.
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:
test-boundaries [2 times]
Quit
completion--some: Assertion failed: (string-prefix-p ustring ufull) [2
times]
Quit
(basic)
nil [2 times]
completion--some: Assertion failed: (string-prefix-p ustring ufull) [2
times]
Quit [2 times]
next-line: End of buffer
Mark set
Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --enable-libsystemd --with-pop=yes
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Configured features:
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system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit
x multi-tty make-network-process emacs)
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Daniel Mendler <mail@HIDDEN> Subject: bug#47678: Acknowledgement (27.1; `completion-boundaries` assertion failure for file) Message-ID: <handler.47678.B.161800054110851.ack <at> debbugs.gnu.org> References: <8d537117-d036-ad84-e013-d98efb3ae0c4@HIDDEN> X-Gnu-PR-Message: ack 47678 X-Gnu-PR-Package: emacs Reply-To: 47678 <at> debbugs.gnu.org Date: Fri, 09 Apr 2021 20:36:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 47678 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 47678: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D47678 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
Resent-From: Stefan Monnier <monnier@HIDDEN>
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From: Stefan Monnier <monnier@HIDDEN>
Message-ID: <jwvpmyz9knm.fsf-monnier+emacs@HIDDEN>
References: <8d537117-d036-ad84-e013-d98efb3ae0c4@HIDDEN>
Date: Mon, 12 Apr 2021 19:28:00 -0400
In-Reply-To: <8d537117-d036-ad84-e013-d98efb3ae0c4@HIDDEN> (Daniel
Mendler's message of "Fri, 9 Apr 2021 22:35:28 +0200")
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> 2. Press "C-x C-f"
> 3. Enter the path "~//"
> 4. Move the point between the slashes, "~/|/"
> 5. Press "C-."
Thanks!
[ It would have helped to say what happens for you there. ]
> The function `test-boundaries' should determine the completion
> boundaries correctly. I assume that the function `completion-boundaries'
> should never fail with an error.
[ From this I can guess that you maybe got some kind of error?
Including a backtrace or the text of the error or some
description of the error would have been helpful. ]
I installed the patch below, which seems to fix the immediate problem
I managed to reproduce, but it might lead to further problems down
the road.
Stefan
diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index 5f594679ca..c900b0d7ce 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -488,8 +488,17 @@ completion-table-with-quoting
(qsuffix (cdr action))
(ufull (if (zerop (length qsuffix)) ustring
(funcall unquote (concat string qsuffix))))
- (_ (cl-assert (string-prefix-p ustring ufull)))
- (usuffix (substring ufull (length ustring)))
+ ;; If (not (string-prefix-p ustring ufull)) we have a problem:
+ ;; the unquoting the qfull gives something "unrelated" to ustring.
+ ;; E.g. "~/" and "/" where "~//" gets unquoted to just "/" (see
+ ;; bug#47678).
+ ;; In that case we can't even tell if we're right before the
+ ;; "/" or right after it (aka if this "/" is from qstring or
+ ;; from qsuffix), which which usuffix to use is very unclear.
+ (usuffix (if (string-prefix-p ustring ufull)
+ (substring ufull (length ustring))
+ ;; FIXME: Maybe "" is preferable/safer?
+ qsuffix))
(boundaries (completion-boundaries ustring table pred usuffix))
(qlboundary (car (funcall requote (car boundaries) string)))
(qrboundary (if (zerop (cdr boundaries)) 0 ;Common case.
X-Loop: help-debbugs@HIDDEN
Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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From: Daniel Mendler <mail@HIDDEN>
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On 4/13/21 1:28 AM, Stefan Monnier wrote:
>> 2. Press "C-x C-f"
>> 3. Enter the path "~//"
>> 4. Move the point between the slashes, "~/|/"
>> 5. Press "C-."
>
> Thanks!
> [ It would have helped to say what happens for you there. ]
Yes, I wrote "assertion failure". Sorry for not having been more precise
(out of bounds error/assertion failure and pasted a stack trace, I will
do that the next time). On Emacs 28 it seems to only give an out of
bounds error directly. But from the patch below you identified the
relevant line. I had seen ufull/ustring/usomething in the error message.
> I installed the patch below, which seems to fix the immediate problem
> I managed to reproduce, but it might lead to further problems down
> the road.
Thank you for looking into this. I hope this will not lead to further
problems, it is mostly an edge case when moving around the cursor and
the path at that point is not really valid? What kind of issues could
happen? I can always enter some invalid/shadowed path ///, /~~~/, ~/~/~,
which do not make problems (at least with this patch).
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> Thank you for looking into this. I hope this will not lead to further
> problems, it is mostly an edge case when moving around the cursor and the
> path at that point is not really valid? What kind of issues could happen?
> I can always enter some invalid/shadowed path ///, /~~~/, ~/~/~, which do
> not make problems (at least with this patch).
The problem has to do with quoting/unquoting: in `C-x C-f` we do not
quite enter "raw file name" because the name typed by the user is passed
through `substitute-in-file-name` which expands envvar references (and
de-doubles dollars for those files whose name looks like an envvar
reference) and does some truncation (like foo//bar => /bar).
So the `completion-file-name-table` (which completes raw file names) is
wrapped via `completion-table-with-quoting` and this function has to be
able to relate the unquoted text back to the quoted text, for example in
order to convert the boundaries returned by `completion-file-name-table`
(on the unquoted file name) into the corresponding boundaries that apply
to the quoted file name.
This is in general somewhere between hard and impossible. So if/when we
get those boundaries wrong (for example) it may lead to misbehavior down
the line.
I'd rather not try and guess what those might be.
I'm just hoping that they're minor enough and rare enough.
Stefan
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On 4/13/21 2:46 PM, Stefan Monnier wrote:
> The problem has to do with quoting/unquoting: in `C-x C-f` we do not
> quite enter "raw file name" because the name typed by the user is passed
> through `substitute-in-file-name` which expands envvar references (and
> de-doubles dollars for those files whose name looks like an envvar
> reference) and does some truncation (like foo//bar => /bar).
I am aware of that feature and use it but for now I avoided looking into
how this is exactly implemented :)
> So the `completion-file-name-table` (which completes raw file names) is
> wrapped via `completion-table-with-quoting` and this function has to be
> able to relate the unquoted text back to the quoted text, for example in
> order to convert the boundaries returned by `completion-file-name-table`
> (on the unquoted file name) into the corresponding boundaries that apply
> to the quoted file name.
>
> This is in general somewhere between hard and impossible. So if/when we
> get those boundaries wrong (for example) it may lead to misbehavior down
> the line.
> I'd rather not try and guess what those might be.
> I'm just hoping that they're minor enough and rare enough.
Thank you for the detailed explanation.
Ok, but in the case where this issue occurs we already have a somehow
broken path, especially when moving with the point over the shadowed
parts. So as a user I would not be worried to much if this does not work.
I hope most assumptions down the line are checked by conditions. However
given that in this particular case we already have an error we could
only get more errors at worst down the line?
(Btw, in Vertico I throw out the shadowed paths as soon as I get the
opportunity (vertico--tidy-shadowed-file) in the same way as Icomplete
does it if enabled.)
Daniel
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> (Btw, in Vertico I throw out the shadowed paths as soon as I get the
> opportunity (vertico--tidy-shadowed-file) in the same way as Icomplete does
> it if enabled.)
The default completion UI tries pretty hard to avoid all operations that
are specific to a particular backend. There are still some details
where we do things differently when we know we're completing filenames,
but I consider these to be failures of the API that need to be fixed.
IOW I consider the existence of `vertico--tidy-shadowed-file` as a bug
in itself ;-)
Stefan
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Content preview: Stefan Monnier <monnier@HIDDEN> writes: > IOW I
consider the existence of `vertico--tidy-shadowed-file` as a bug > in itself
;-) Skimming this thread, I'm not sure whether there's anything to be done
in Emacs here?
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Stefan Monnier <monnier@HIDDEN> writes:
> IOW I consider the existence of `vertico--tidy-shadowed-file` as a bug
> in itself ;-)
Skimming this thread, I'm not sure whether there's anything to be done
in Emacs here?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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From: Daniel Mendler <mail@HIDDEN>
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On 5/6/21 12:01 PM, Lars Ingebrigtsen wrote:
> Stefan Monnier <monnier@HIDDEN> writes:
>
>> IOW I consider the existence of `vertico--tidy-shadowed-file` as a bug
>> in itself ;-)
>
> Skimming this thread, I'm not sure whether there's anything to be done
> in Emacs here?
@Stefan The existence of this function is a bug for people who want to
keep their shadowed paths. This is a matter of preference. For me
shadowed paths are a cheap means of changing the directory during
completion and I usually don't want to go back to the old path in the
process. Icomplete has the same function, but guarded behind a
customization option. Why do you prefer to keep the shadowed paths?
@Lars From what I see, Stefan already fixed the bug?
Daniel
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Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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Content preview: Daniel Mendler <mail@HIDDEN> writes: > @Lars From
what I see, Stefan already fixed the bug? OK, closing this bug report, then.
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Daniel Mendler <mail@HIDDEN> writes:
> @Lars From what I see, Stefan already fixed the bug?
OK, closing this bug report, then.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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From: Stefan Monnier <monnier@HIDDEN>
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Mendler's message of "Thu, 6 May 2021 13:07:40 +0200")
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Daniel Mendler [2021-05-06 13:07:40] wrote:
> On 5/6/21 12:01 PM, Lars Ingebrigtsen wrote:
>> Stefan Monnier <monnier@HIDDEN> writes:
>>> IOW I consider the existence of `vertico--tidy-shadowed-file` as a bug
>>> in itself ;-)
>> Skimming this thread, I'm not sure whether there's anything to be done
>> in Emacs here?
There is, but it's not a simple "bug fix". What I meant above is that the
existence of `vertico--tidy-shadowed-file` reflects a shortcoming of the
completion API, which does not offer any way for the completion-table to
explain this kind of "shadowing", so the UI is stuck using ad-hoc tricks
by trying to detect use of some specific completion tables (e.g. by
testing `minibuffer-completing-file-name`) and then using
"inside-knowledge" of the semantics behind it.
Not only the way it's done is inevitably "hackish", but it's also very
hard to make it correct. E.g. the shadowing is not a property of
file names but of `substitute-in-file-name`, so `file-name-shadow-mode`
and `vertico--tidy-shadowed-file` can misfire if you're reading a file
name which will not be passed to `substitute-in-file-name`.
> @Stefan The existence of this function is a bug for people who want to
> keep their shadowed paths. This is a matter of preference. For me
> shadowed paths are a cheap means of changing the directory during
> completion and I usually don't want to go back to the old path in the
> process. Icomplete has the same function, but guarded behind a
> customization option. Why do you prefer to keep the shadowed paths?
I don't. I think it makes a lot of sense as a UI feature.
To do it right, we'd need completion tables to provide some kind of
"tidy up" or "simplify" or "canonicalize" method, I think.
Stefan
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Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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From: Daniel Mendler <mail@HIDDEN>
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On 5/9/21 1:41 AM, Stefan Monnier wrote:
> Not only the way it's done is inevitably "hackish", but it's also very
> hard to make it correct. E.g. the shadowing is not a property of
> file names but of `substitute-in-file-name`, so `file-name-shadow-mode`
> and `vertico--tidy-shadowed-file` can misfire if you're reading a file
> name which will not be passed to `substitute-in-file-name`.
> ...
> To do it right, we'd need completion tables to provide some kind of
> "tidy up" or "simplify" or "canonicalize" method, I think.
Thank you for the clarification. I agree. A while ago when fiddling with
file based commands I had wondered why completing-read or the UI can
even return shadowed paths leading to complications down the road. A
canonicalize method would be a good way to achieve this generically. Are
there more examples where one would want to do such a canonicalization?
In the case of file name canonicalization, one has to consider - the
file name is allowed to contain environment variables. This is a feature
which I would like to retain at the UI level. It would be good if the
returned string is canonicalized, but I do not want to dynamically
expand the environment variable while the user enters input. In
contrast, with shadowed paths I am perfectly fine if the UI removes that
shadowed path automatically, like Icomplete and Vertico do it.
What do you mean by "providing a method"? Add a method to the completion
table function itself or to add a completion metadata
`canonicalize-function`? Modifying the completion table specification
itself is more problematic since it is not extensible in its current form.
Daniel
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Subject: bug#47678: 27.1; `completion-boundaries` assertion failure for file
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From: Stefan Monnier <monnier@HIDDEN>
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> Thank you for the clarification. I agree. A while ago when fiddling with
> file based commands I had wondered why completing-read or the UI can
> even return shadowed paths leading to complications down the road. A
> canonicalize method would be a good way to achieve this generically. Are
> there more examples where one would want to do such a canonicalization?
Good question. I can imagine it being used in a few other "file-like"
completion tables (e.g. MH mailboxes), but it doesn't seem nearly as
useful. There might also be some possible uses in a context of quoting
where it could return the string but quoted in a "canonical way"
(e.g. for file names, it could maybe double the lone `$` signs that
happen not to match any env-var, or add {...} around the env-vars), ...
But no, none of those are very compelling candidates.
For this reason, the current hack lives on.
> What do you mean by "providing a method"?
Nothing specific.
Stefan
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