From: Michael Albinus <michael.albinus@gmx.de>
To: Gregory Heytings <ghe@sdf.org>
Cc: rrandresf@gmail.com, Tim Vaughan <timv@ughan.xyz>,
41423@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
Subject: bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest]
Date: Sat, 29 Aug 2020 14:38:45 +0200 [thread overview]
Message-ID: <87mu2d7hka.fsf@gmx.de> (raw)
In-Reply-To: <alpine.NEB.2.22.394.2008290031430453.17495@sdf.lonestar.org> (Gregory Heytings's message of "Fri, 28 Aug 2020 23:15:12 +0000")
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Gregory Heytings <ghe@sdf.org> writes:
Hi,
> Apparently my previous last note was not the last one ;-)
>
> I still don't know how this bug should be fixed (except by using (setq
> completion-at-point-functions '(pcomplete t))), but here is a more
> detailed explanation of what is happening, at least how I understand
> it:
>
> 1. TAB calls completion-at-point
> 2. completion-at-point calls pcomplete-completions-at-point, which
> calls pcomplete/cd; this completes the directory name
> 3. completion-at-point let-binds completion-in-region-mode-predicate
> to a lambda, which contains pcomplete-completion-at-point
> 4. completion-at-point calls completion-in-region, which adds
> completion-in-region--postch to post-command-hook
> 5. post-command-hook calls completion-in-region--postch
> 6. completion-in-region--postch funcalls completion-in-region-mode-predicate
> 7. this calls pcomplete-completions-at-point a second time, which
> again calls pcomplete/cd (and adds a '/' after the directory name (?))
> 8. RET is pressed
> 9. post-command-hook still contains completion-in-region--postch: it
> is called again
> 10. completion-in-region--postch funcalls
> completion-in-region-mode-predicate again
> 11. this calls pcomplete-completions-at-point a third (!) time
> 12. at this point pcomplete-completions-at-point considers (for some
> reason, possibly because the last character of the input is '/' (?))
> that it is a command that it must now complete
> 13. therefore instead of calling pcomplete/cd a third time,
> pcomplete-completions-at-point now calls eshell-complete-commands-list
> 14. this loops through all possible command names (on the local or remote host)
> 15. if all command names had had a common prefix, that prefix would
> have been inserted now, but this is not the case, so the effect of
> this loop (apart from a waste of time) is nil
>
> The fact that default-directory is remote is not important here, the
> exact same steps take place when it is local, except that step 15 is
> executed much faster.
>
> At step 15 it is possible to interrupt the loop with C-g. At step 8
> it is possible to remove completion-in-region--postch from
> post-command-hook for example by switching buffers with C-x C-b.
>
> Why such a overly complicated mechanism is used, or what should be
> done to avoid this behavior, is beyond my understanding.
I don't know the completion machinery, so I'm adding Stefan who might
know better.
However, the remote case could be improved. Tramp uses caches. They
expire after a while (10 seconds per default), but this might be
improved. The appended patch disables Tramp cache expiry while being in
eshell-complete-commands-list, so completion might be faster once the
cache has been filled. Could you pls check?
Best regards, Michael.
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: Type: text/x-patch, Size: 816 bytes --]
*** /tmp/ediff046iSD 2020-08-29 14:36:21.788278641 +0200
--- /usr/local/src/emacs-27/lisp/eshell/em-cmpl.el 2020-08-29 14:22:38.781483169 +0200
***************
*** 399,405 ****
(defun eshell-complete-commands-list ()
"Generate list of applicable, visible commands."
! (let ((filename (pcomplete-arg)) glob-name)
(if (file-name-directory filename)
(if eshell-force-execution
(pcomplete-dirs-or-entries nil #'file-readable-p)
--- 399,405 ----
(defun eshell-complete-commands-list ()
"Generate list of applicable, visible commands."
! (let ((filename (pcomplete-arg)) glob-name remote-file-name-inhibit-cache)
(if (file-name-directory filename)
(if eshell-force-execution
(pcomplete-dirs-or-entries nil #'file-readable-p)
next prev parent reply other threads:[~2020-08-29 12:38 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 16:20 bug#41423: 27.0.91; tramp regression on pretest rrandresf
[not found] ` <handler.41423.B.158999173030371.ack@debbugs.gnu.org>
2020-05-20 17:35 ` bug#41423: additional info andrés ramírez
2020-05-28 11:48 ` bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest] (was: bug#41423: additional info) Michael Albinus
2021-02-01 2:45 ` bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest] Stefan Monnier
2021-02-01 4:36 ` bug#41423: Installing the fix for bug#41423 on emacs-27 (was: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest]) Stefan Monnier
2021-02-01 9:59 ` bug#41423: Installing the fix for bug#41423 on emacs-27 Michael Albinus
2021-02-01 14:47 ` bug#41423: Installing the fix for bug#41423 on emacs-27 (was: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest]) Eli Zaretskii
2021-02-01 15:33 ` bug#41423: Installing the fix for bug#41423 on emacs-27 Stefan Monnier
2021-02-01 15:53 ` andrés ramírez
2021-02-01 16:13 ` Stefan Monnier
2021-02-01 17:35 ` andrés ramírez
2022-06-27 8:29 ` bug#41423: bug#47389: 27.1.91; completion issue on eshell Lars Ingebrigtsen
2022-06-27 11:37 ` andrés ramírez
2022-06-27 11:44 ` Lars Ingebrigtsen
2020-08-19 10:24 ` bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest] Tim Vaughan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-27 14:38 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-28 9:32 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-28 13:17 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-28 23:15 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-29 12:38 ` Michael Albinus [this message]
2020-08-29 15:44 ` Stefan Monnier
2020-08-29 16:12 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-30 3:55 ` Stefan Monnier
2020-08-30 22:28 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-31 8:30 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-01 4:23 ` Stefan Monnier
2020-09-01 8:31 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-01 10:14 ` Eli Zaretskii
2020-09-01 11:50 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-01 13:08 ` Stefan Monnier
2020-09-01 13:30 ` Stefan Monnier
2020-09-01 15:41 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-01 13:04 ` Stefan Monnier
2020-09-01 15:40 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-02 0:31 ` Stefan Monnier
2020-09-02 10:26 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-02 10:33 ` Michael Albinus
2020-09-02 16:00 ` Drew Adams
2021-01-31 17:07 ` xristos--- via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-02 16:36 ` Stefan Monnier
2020-09-02 19:52 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-09-02 20:08 ` Stefan Monnier
2020-08-29 13:08 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-29 16:54 ` Michael Albinus
2020-08-29 17:14 ` Gregory Heytings via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-08-29 17:28 ` Michael Albinus
2021-04-21 16:06 ` bug#41423: Installing the fix for bug#41423 on emacs-27 Andrés Ramírez
2021-04-23 22:14 ` Stefan Monnier
2021-04-24 3:37 ` andrés ramírez
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