GNU bug report logs - #74944
31.0.50; Double TAB does not pop up *Completions* buffer when completing filename with dashes

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Double TAB does not pop up *Completions* buffer when
 completing filename with dashes
Date: Wed, 18 Dec 2024 18:20:09 +0530

When completing filenames with dashes in them inside a shell-buffer,
double TAB does not pop open the *Completions* buffer because it
conflicts with argument completion.  To reproduce,

    1. cd /tmp
    2. mkdir test; cd test
    3. touch blah_blah-pos-1.xyz; touch wowow-pos-1.xyz
    4. Go to this directory in a shell buffer
    5. Type rm pos.xyz TAB
    6. Observe how it completes to `rm -pos-1.xyz'
    7. Press TAB again and observe *Completions* buffer not popping up

I expect Emacs to fall back to completing filenames when completing
against arguments fail.  The current situation is a bit confusing (and
annoying) when completing filenames like these.


In GNU Emacs 31.0.50 (build 27, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.2, Xaw scroll bars) of 2024-12-07 built on astatine
Repository revision: 9ddec89e422d0dd6e9069731b8f2dd2c90aa5607
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101014
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --without-xaw3d
 --without-gconf --without-libsystemd --with-cairo CFLAGS=-g3'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM
XINPUT2 XPM LUCID ZLIB
Important settings:
  value of $LC_MONETARY: ta_IN.UTF-8
  value of $LC_NUMERIC: ta_IN.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Shell

Minor modes in effect:
  TeX-PDF-mode: t
  recentf-mode: t
  buffer-face-mode: t
  eros-mode: t
  pdf-occur-global-minor-mode: t
  minibuffer-depth-indicate-mode: t
  repeat-mode: t
  display-time-mode: t
  display-battery-mode: t
  delete-selection-mode: t
  xterm-mouse-mode: t
  vz/winkey-minor-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  use-hard-newlines: t
  tab-bar-history-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  undelete-frame-mode: t
  minibuffer-regexp-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Message #8 received at 74944 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: 74944 <at> debbugs.gnu.org
Subject: Re: bug#74944: 31.0.50; Double TAB does not pop up *Completions*
 buffer when completing filename with dashes
Date: Sat, 21 Dec 2024 13:31:04 +0100

Visuwesh <visuweshm <at> gmail.com> writes:

> When completing filenames with dashes in them inside a shell-buffer,
> double TAB does not pop open the *Completions* buffer because it
> conflicts with argument completion.  To reproduce,
>
>     1. cd /tmp
>     2. mkdir test; cd test
>     3. touch blah_blah-pos-1.xyz; touch wowow-pos-1.xyz
>     4. Go to this directory in a shell buffer
>     5. Type rm pos.xyz TAB
>     6. Observe how it completes to `rm -pos-1.xyz'
>     7. Press TAB again and observe *Completions* buffer not popping up

Hi Visuwesh,

I can reproduce this.  FWIW, by instrumenting
`shell-filename-completion' with edebug, I can see that there is a
correct *Completions* buffer at some point but it "disappears" later.
I'll try to investigate it further.
-- 
Manuel Giraud

Message #11 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of
 text editors" <bug-gnu-emacs <at> gnu.org>
Cc: 74944 <at> debbugs.gnu.org, Visuwesh <visuweshm <at> gmail.com>
Subject: Re: bug#74944: 31.0.50; Double TAB does not pop up *Completions*
 buffer when completing filename with dashes
Date: Sun, 22 Dec 2024 12:45:00 +0100

Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs <at> gnu.org> writes:

> Visuwesh <visuweshm <at> gmail.com> writes:
>
>> When completing filenames with dashes in them inside a shell-buffer,
>> double TAB does not pop open the *Completions* buffer because it
>> conflicts with argument completion.  To reproduce,
>>
>>     1. cd /tmp
>>     2. mkdir test; cd test
>>     3. touch blah_blah-pos-1.xyz; touch wowow-pos-1.xyz
>>     4. Go to this directory in a shell buffer
>>     5. Type rm pos.xyz TAB
>>     6. Observe how it completes to `rm -pos-1.xyz'
>>     7. Press TAB again and observe *Completions* buffer not popping up
>
> Hi Visuwesh,
>
> I can reproduce this.  FWIW, by instrumenting
> `shell-filename-completion' with edebug, I can see that there is a
> correct *Completions* buffer at some point but it "disappears" later.
> I'll try to investigate it further.

Hi,

I did some more tests but this issue is tricky for me and I'm not
familiar with the completion framework.  Anyway, here is what I did (and
think I understood):

        - First, I instrument `shell-filename-completion' with edebug
        
        - I enter "rm -pos-1.xyz" and hit Tab with the point is right
          after the 'z'

        - Edebug is trigerred and I can step through it hitting Space.

        - All seems fine, but at the end of this
          `shell-filename-completion' call (which returns something),
          Edebug is triggered again this time with the point placed just
          before the first '-'

I really don't understand why there is what seems to be a *second* call
to `shell-filename-completion' while the first one seems to have
succeeded.  The backtrace from the first call looks like this:

--8<---------------cut here---------------start------------->8---
  shell-command-completion()
  run-hook-with-args-until-success(shell-command-completion)
  comint-completion-at-point()
  completion--capf-wrapper(comint-completion-at-point all)
  run-hook-wrapped(completion--capf-wrapper comint-completion-at-point all)
  completion-at-point()
  funcall-interactively(completion-at-point)
  call-interactively(completion-at-point nil nil)
  command-execute(completion-at-point)
--8<---------------cut here---------------end--------------->8---

And here is the backtrace from this "second" call:
--8<---------------cut here---------------start------------->8---
  shell-command-completion()
  run-hook-with-args-until-success(shell-command-completion)
  comint-completion-at-point()
  #f(compiled-function () #<bytecode 0x347c002d48b3cbc>)()
  completion-in-region--postch()
--8<---------------cut here---------------end--------------->8---
-- 
Manuel Giraud

Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: "Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of
 text editors" <bug-gnu-emacs <at> gnu.org>, 74944 <at> debbugs.gnu.org
Subject: Re: bug#74944: 31.0.50; Double TAB does not pop up *Completions*
 buffer when completing filename with dashes
Date: Thu, 26 Dec 2024 18:41:35 +0530

[ஞாயிறு டிசம்பர் 22, 2024] Manuel Giraud wrote:

> Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of
> text editors" <bug-gnu-emacs <at> gnu.org> writes:
>
>> Visuwesh <visuweshm <at> gmail.com> writes:
>>
>>> When completing filenames with dashes in them inside a shell-buffer,
>>> double TAB does not pop open the *Completions* buffer because it
>>> conflicts with argument completion.  To reproduce,
>>>
>>>     1. cd /tmp
>>>     2. mkdir test; cd test
>>>     3. touch blah_blah-pos-1.xyz; touch wowow-pos-1.xyz
>>>     4. Go to this directory in a shell buffer
>>>     5. Type rm pos.xyz TAB
>>>     6. Observe how it completes to `rm -pos-1.xyz'
>>>     7. Press TAB again and observe *Completions* buffer not popping up
>>
>> Hi Visuwesh,
>>
>> I can reproduce this.  FWIW, by instrumenting
>> `shell-filename-completion' with edebug, I can see that there is a
>> correct *Completions* buffer at some point but it "disappears" later.
>> I'll try to investigate it further.
>
> Hi,
>
> I did some more tests but this issue is tricky for me and I'm not
> familiar with the completion framework.  

Thank you for looking into this.  I have probably lower familiarity with
it than you.

> Anyway, here is what I did (and think I understood):
>
>         - First, I instrument `shell-filename-completion' with edebug
>         
>         - I enter "rm -pos-1.xyz" and hit Tab with the point is right
>           after the 'z'
>
>         - Edebug is trigerred and I can step through it hitting Space.
>
>         - All seems fine, but at the end of this
>           `shell-filename-completion' call (which returns something),
>           Edebug is triggered again this time with the point placed just
>           before the first '-'
>
> I really don't understand why there is what seems to be a *second* call
> to `shell-filename-completion' while the first one seems to have
> succeeded.  

The second call which moves the before the first '-' makes sense to me
since to complete further one, one has to insert text before that
character.  This happens elsewhere too so I am not exactly surprised.
However, I think this is where the capf gets stuck since Emacs thinks it
has to complete an option / a flag and the completion engine stops.

This is my guess, anyway.

Message #23 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: "Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of
 text editors" <bug-gnu-emacs <at> gnu.org>, 74944 <at> debbugs.gnu.org
Subject: Re: bug#74944: 31.0.50; Double TAB does not pop up *Completions*
 buffer when completing filename with dashes
Date: Tue, 07 Jan 2025 16:01:32 +0100

Visuwesh <visuweshm <at> gmail.com> writes:

[...]

> The second call which moves the before the first '-' makes sense to me
> since to complete further one, one has to insert text before that
> character.  This happens elsewhere too so I am not exactly surprised.
> However, I think this is where the capf gets stuck since Emacs thinks it
> has to complete an option / a flag and the completion engine stops.

Hi Visuwesh,

I was down the rabbit hole on this one and now, I need some fresh air
and, hopefully, advices from experts here.

The culprit seems to be that `shell-filename-completion' does not know
how to complete the filename when the point is on '-' with the following
input in the *shell* buffer:

      $ rm -pos1.xyz

And it is due to the fact that `comint-word' is only looking for a word
*backward*.  I don't understand why is that so I tried to make
`comint-word' also looking for a word forward.  But then the following
assertion in `completion-in-region' is violated:

  (cl-assert (<= start (point)) (<= (point) end))

Does anyone could help me here?
-- 
Manuel Giraud

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