GNU bug report logs - #1206
double slash // in read-shell-command completion

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Package: emacs; Severity: minor; Reported by: Eli Zaretskii <eliz@HIDDEN>; Done: Eli Zaretskii <eliz@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Sat, 15 Feb 2025 17:34:18 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Mauro Aranda <maurooaranda@HIDDEN>
In-Reply-To: <75152115-2732-4d58-8324-799cf1364f53@HIDDEN> (message from
 Mauro Aranda on Sat, 15 Feb 2025 10:33:59 -0300)
Subject: Re: bug#1206: double slash // in read-shell-command completion
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> Date: Sat, 15 Feb 2025 10:33:59 -0300
> From: Mauro Aranda <maurooaranda@HIDDEN>
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
>  >> From: Glenn Morris <rgm@HIDDEN>
>  >> Cc: 1206 <at> debbugs.gnu.org
>  >> Date: Tue, 01 Mar 2011 23:14:15 -0500
>  >>
>  >>
>  >> Do you still see this? I don't think I do.
>  >
>  > No, but it still isn't right: it inserts an extra slash. That is, I
>  > get something like "d:/gnu/emacs-foo//lisp".  The extra slash in this
>  > situation is really not nice...
>  >
>  > This happens both with Emacs 23.3 RC1 and with the development trunk.
> 
> This is an old bug report you filed, that I used to be able to reproduce
> years ago when I was looking for old bugs to fix.
> 
> Thing is, I'm not able to reproduce it anymore.  I did this:
> 
> In a directory that looks like this:
> .
> ├── emacs
> │   ├── emacs-27
> │   │   ├── lisp
> │   ├── emacs-28
> │   │   ├── lisp
> │   ├── emacs-29
> │   │   ├── lisp
> 
> emacs -Q
> M-!
> ls ~/emacs/emacs-2/lisp
> Move point to the slash before "lisp".
> TAB
> 
> Emacs shows:
> 3 possible completions:
> emacs-27/
> emacs-28/
> emacs-29/
> 
> Select one and now the minibuffer shows:
> ~/emacs/emacs-27/lisp
> 
> 
> Emacs 28 shows the behavior you reported.  Then Emacs 29 showed: "No
> match", which is wrong.  But then, after the following commit, I can't
> reproduce it anymore:

Yes, this is now fixed in Emacs 30 (Emacs 29.4 is still wrong, albeit
in a different way).

So I'm closing this bug, thanks.  Good riddance!
Notification sent to Eli Zaretskii <eliz@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Eli Zaretskii <eliz@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 1206 <at> debbugs.gnu.org:


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To: Eli Zaretskii <eliz@HIDDEN>, 1206 <at> debbugs.gnu.org
From: Mauro Aranda <maurooaranda@HIDDEN>
Subject: Re: bug#1206: double slash // in read-shell-command completion
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Hi Eli,

Eli Zaretskii <eliz@HIDDEN> writes:

 >> From: Glenn Morris <rgm@HIDDEN>
 >> Cc: 1206 <at> debbugs.gnu.org
 >> Date: Tue, 01 Mar 2011 23:14:15 -0500
 >>
 >>
 >> Do you still see this? I don't think I do.
 >
 > No, but it still isn't right: it inserts an extra slash. That is, I
 > get something like "d:/gnu/emacs-foo//lisp".  The extra slash in this
 > situation is really not nice...
 >
 > This happens both with Emacs 23.3 RC1 and with the development trunk.

This is an old bug report you filed, that I used to be able to reproduce
years ago when I was looking for old bugs to fix.

Thing is, I'm not able to reproduce it anymore.  I did this:

In a directory that looks like this:
.
├── emacs
│   ├── emacs-27
│   │   ├── lisp
│   ├── emacs-28
│   │   ├── lisp
│   ├── emacs-29
│   │   ├── lisp

emacs -Q
M-!
ls ~/emacs/emacs-2/lisp
Move point to the slash before "lisp".
TAB

Emacs shows:
3 possible completions:
emacs-27/
emacs-28/
emacs-29/

Select one and now the minibuffer shows:
~/emacs/emacs-27/lisp


Emacs 28 shows the behavior you reported.  Then Emacs 29 showed: "No
match", which is wrong.  But then, after the following commit, I can't
reproduce it anymore:

commit ff3f17ca3cdd9e82355942f577e7807acc76ddcd
Author: Dmitry Gutov <dmitry@HIDDEN>
Date:   Thu May 9 05:30:32 2024 +0300

     choose-completion: Retain the suffix after completion boundary

     * lisp/minibuffer.el (completion-base-suffix):
     Remove as not optimal after all (bug#48356).
     (completion--replace): Use insert-before-markers-and-inherit.
     (minibuffer-completion-help): Don't set completion-base-affixes,
     implement the same logic more optimally by local search and
     querying for field boundaries.  Also fix the problem with
     completion table, predicate and extra-props being looked up in the
     wrong buffer.
     (minibuffer-next-completion, minibuffer-choose-completion):
     Don't bind completion-use-base-affixes anymore.

     * lisp/simple.el (completion-base-affixes)
     (completion-use-base-affixes): Remove.
     (completion-list-insert-choice-function):
     Don't pass them through anymore.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#1206; Package emacs. Full text available.
Severity set to 'minor' from 'normal' Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Changed bug title to 'double slash // in read-shell-command completion' from '23.0.60; read-shell-command completion problem' Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 1206 <at> debbugs.gnu.org:


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Date: Wed, 02 Mar 2011 19:57:20 +0200
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: 23.0.60; read-shell-command completion problem
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> From: Glenn Morris <rgm@HIDDEN>
> Cc: 1206 <at> debbugs.gnu.org
> Date: Tue, 01 Mar 2011 23:14:15 -0500
> 
> 
> Do you still see this? I don't think I do.

No, but it still isn't right: it inserts an extra slash.  That is, I
get something like "d:/gnu/emacs-foo//lisp".  The extra slash in this
situation is really not nice...

This happens both with Emacs 23.3 RC1 and with the development trunk.
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#1206; Package emacs. Full text available.

Message received at 1206 <at> debbugs.gnu.org:


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From: Glenn Morris <rgm@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: 23.0.60; read-shell-command completion problem
References: <877hub5is0.fsf@HIDDEN> <83skcqa2uf.fsf@HIDDEN>
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Do you still see this? I don't think I do.
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#1206; Package emacs. Full text available.

Message received at 1206@HIDDEN:


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From eliz@HIDDEN Sat Nov  7 05:22:35 2009
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Date: Sat, 07 Nov 2009 15:20:24 +0200
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: 23.0.60; read-shell-command completion problem
In-reply-to: <877hub5is0.fsf@HIDDEN>
X-012-Sender: halo1@HIDDEN
To: Chong Yidong <cyd@HIDDEN>
Cc: 1206 <at> debbugs.gnu.org
Reply-to: Eli Zaretskii <eliz@HIDDEN>
Message-id: <83skcqa2uf.fsf@HIDDEN>
References: <877hub5is0.fsf@HIDDEN>

> From: Chong Yidong <cyd@HIDDEN>
> Cc: 1206@HIDDEN
> Date: Sat, 31 Oct 2009 17:57:03 -0400
> 
> Hi Eli,
> 
> Could you test the patch I posted at
> 
>   http://debbugs.gnu.org/cgi/bugreport.cgi?bug=1206

Sorry for the long delay.  I tested the patch now on MS-Windows, and I
still see two slashes, exactly like in the original report.  The
problem seems to be that minibuffer-completing-file-name is nil when
the modified code is run.
Acknowledgement sent to Eli Zaretskii <eliz@HIDDEN>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.
Information forwarded to bug-submit-list@HIDDEN, Emacs Bugs <bug-gnu-emacs@HIDDEN>:
bug#1206; Package emacs. Full text available.

Message received at 1206@HIDDEN:


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From: Chong Yidong <cyd@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Cc: 1206 <at> debbugs.gnu.org
Subject: Re: 23.0.60; read-shell-command completion problem
Date: Sat, 31 Oct 2009 17:57:03 -0400
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Hi Eli,

Could you test the patch I posted at

  http://debbugs.gnu.org/cgi/bugreport.cgi?bug=1206

Thanks!
Acknowledgement sent to Chong Yidong <cyd@HIDDEN>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.
Information forwarded to bug-submit-list@HIDDEN, Emacs Bugs <bug-gnu-emacs@HIDDEN>:
bug#1206; Package emacs. Full text available.

Message received at 1206@HIDDEN:


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From: Chong Yidong <cyd@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Cc: 1206 <at> debbugs.gnu.org
Subject: Re: 23.0.60; read-shell-command completion problem
Date: Sat, 15 Aug 2009 19:57:13 -0400
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>   emacs -Q
>   M-!
>   ls d:/gnu/emacs/lisp
>
> Move point so that the cursor is on the slash between "emacs" and
> "lisp", and type TAB.  At this point, the *Completions* buffer pops up
>
>   Click <mouse-2> on a completion to select it.
>   In this buffer, type RET to select the completion near point.
>
>   Possible completions are:
>   emacs-21.4/            emacs-22-branch/      emacs-22.x/
>   emacs-23.pre-unicode/  emacs-bidi/           emacs-rtf/
>   emacs/
>
> Clicking on "emacs-22-branch/" produces this in the minibuffer:
>
>   emacs-22-branch//lisp

Could you test the following patch (admittedly a bit of a hack)?

*** trunk/lisp/simple.el.~1.1003.~	2009-08-13 10:30:54.000000000 -0400
--- trunk/lisp/simple.el	2009-08-15 19:53:04.000000000 -0400
***************
*** 5843,5849 ****
--- 5843,5857 ----
  	(if base-size
  	    (delete-region (+ base-size (field-beginning)) (point))
  	  (choose-completion-delete-max-match choice))
+ 
+ 	;; Insert the choice.  When reading a file name and the choice
+ 	;; is a directory, avoid having an extra "/" (Bug#1206).
  	(insert choice)
+ 	(and minibuffer-completing-file-name
+ 	     (looking-at "/")
+ 	     (= (aref choice (1- (length choice))) ?/)
+ 	     (delete-char 1))
+ 
  	(remove-text-properties (- (point) (length choice)) (point)
  				'(mouse-face nil))
  	;; Update point in the window that BUFFER is showing in.
Acknowledgement sent to Chong Yidong <cyd@HIDDEN>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.
Information forwarded to bug-submit-list@HIDDEN, Emacs Bugs <bug-gnu-emacs@HIDDEN>:
bug#1206; Package emacs. Full text available.

Message received at (unknown):


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Date: Sun, 19 Oct 2008 17:24:24 +0200
From: Eli Zaretskii <eliz@HIDDEN>
Subject: 23.0.60; read-shell-command completion problem
X-012-Sender: halo1@HIDDEN
To: emacs-pretest-bug@HIDDEN
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Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@HIDDEN mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

  emacs -Q
  M-!
  ls d:/gnu/emacs/lisp

Move point so that the cursor is on the slash between "emacs" and
"lisp", and type TAB.  At this point, the *Completions* buffer pops up
with the following possibilities:

  Click <mouse-2> on a completion to select it.
  In this buffer, type RET to select the completion near point.

  Possible completions are:
  emacs-21.4/            emacs-22-branch/      emacs-22.x/
  emacs-23.pre-unicode/  emacs-bidi/           emacs-rtf/
  emacs/

(Depending on your system, you will see something different.)
Clicking on "emacs-22-branch/" produces this in the minibuffer:

  emacs-22-branch//lisp

But I expected it to replace only the "emacs" part (because this is
what it evidently produced the possible completions for), so that I
will see "ls d:/gnu/emacs-22-branch/lisp".

This was on MS-Windows, but I see the same behavior on GNU/Linux:
picking up a completion replaces the whole input, up to the position
of point.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
d:/gnu/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-10-19 on HOME-C4E4A596F7
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1255
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
s e c o n d SPC C - x SPC a n d SPC w a n t e d SPC 
t o SPC b a i l SPC o u t . SPC SPC I S-SPC e x p e 
c t e d SPC t o SPC s e e SPC " Q u i t " , SPC n o 
t SPC a SPC f a t a l SPC <M-backspace> <M-backspace> 
a n SPC e r r o r . ) M-q <C-home> C-SPC <down> C-SPC 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> M-w C-x b <return> C-x 1 C-x <return> c u n 
d e c <tab> <return> C-x C-g <help-echo> <help-echo> 
C-x b * C o m <tab> <return> C-x b <return> M-! l s 
SPC d : / g n u / e m a c s / l i s p <left> <left> 
<left> <left> <left> <tab> <help-echo> <help-echo> 
<help-echo> <down-mouse-1> <mouse-2> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> C-SPC C-e 
M-w <help-echo> <help-echo> <help-echo> C-g C-x b <up> 
<up> <return> <up> <up> <up> <up> C-a C-SPC <down> 
<down> <down> <down> <down> <down> <down> M-w <help-echo> 
C-x b <return> M-x <up> <return>

Recent messages:
Quit [2 times]
universal-coding-system-argument: Wrong type argument: commandp, nil
Mark set [4 times]
Auto-saving...done
Mark set [3 times]
Saved text from "To: emacs-pretest-bug@HIDDEN
Subject: 2"
universal-coding-system-argument: Wrong type argument: commandp, nil
Quit
Mark set
Acknowledgement sent to Eli Zaretskii <eliz@HIDDEN>:
New bug report received and forwarded. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.
Report forwarded to bug-submit-list@HIDDEN, Emacs Bugs <bug-gnu-emacs@HIDDEN>:
bug#1206; Package emacs. Full text available.
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