GNU bug report logs - #40651
26.3; eshell using (fn param) syntax breaks lookups

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

From: Phil <phil <at> beadling.co.uk>
To: bug-gnu-emacs <at> gnu.org 
Subject: 26.3; eshell using (fn param) syntax breaks lookups
Date: Wed, 15 Apr 2020 23:40:10 +0100

Start with clean emacs install.
Install company-mode using package installer.
Start eshell.
Enable company-mode.

Satisfy yourself that lookups work on paths, eg:
cd /home/
Will give a list of completions of directories under home.

Satisfy yourself that lookups work on regular eshell command syntax, eg:
find-
Will give a list of completions including find-file, etc.

Now try the same thing but use lisp syntax as supported by eshell, eg:
(find-

This fails with:
Completion function pcomplete-completions-at-point uses a deprecated
calling convention

Error was original reported to company maintains who have advised it's
an emacs bug not a company bug:
https://github.com/company-mode/company-mode/issues/974

I've debugged a bit further, it looks like:
completion--capf-wrapper(pcomplete-completions-at-point optimist)

Ultimately calls:
completion--capf-wrapper(lisp-completion-at-point all)

And ultimately that is returning to the pcomplete-completions-at-point a
result which fails parsing of result in the outer
completion--capf-wrapper.

More details from edebug backtrace below from inside the inner call of
completion--capf-wrapper.

The problem isn't just that the lisp bracket style of function calling
fails lookups.  It means that all further lookups using the bracket
style or even the eshell style of function call that had previously
worked now fail.

I presume this is because pcomplete completions of both styles are
disregarded by adding the function to completion--capf-misbehave-funs.

The only practical way to resolve is to restart emacs.

It would be great to get a workaround that allowed look-ups of both
styles to work.

If not possible a workaround that prevented the disabling of all
pcomplete completions would mean look-ups would still be partially
usable.

Thanks for any advice,
Phil.

Backtrace below:

  (consp (edebug-after 0 21 res))
  (and (edebug-after (edebug-before 20) 22 (consp (edebug-after 0 21 res))) (edebug-after (edebug-before 23) 27 (not (edebug-after (edebug-before 24) 26 (functionp (edebug-after 0 25 res))))))
  (cond ((edebug-after (edebug-before 19) 28 (and (edebug-after (edebug-before 20) 22 (consp (edebug-after 0 21 res))) (edebug-after (edebug-before 23) 27 (not (edebug-after (edebug-before 24) 26 (functionp ...)))))) (edebug-after (edebug-before 29) 38 (if (edebug-after (edebug-before 30) 33 (member (edebug-after 0 31 fun) (edebug-after 0 32 completion--capf-safe-funs))) nil (edebug-after (edebug-before 34) 37 (let* ((v ...)) (setq completion--capf-safe-funs (cons v ...)))))) (edebug-after (edebug-before 39) 68 (and (edebug-after (edebug-before 40) 46 (eq (quote no) (edebug-after (edebug-before 41) 45 (plist-get ... :exclusive)))) (edebug-after (edebug-before 47) 65 (null (edebug-after (edebug-before 48) 64 (try-completion ... ... ...)))) (edebug-after (edebug-before 66) 67 (setq res nil))))) ((edebug-after (edebug-before 69) 78 (not (edebug-after (edebug-before 70) 77 (or (edebug-after (edebug-before 71) 73 (listp ...)) (edebug-after (edebug-before 74) 76 (functionp ...)))))) (edebug-after (edebug-before 79) 91 (if (edebug-after (edebug-before 80) 83 (member (edebug-after 0 81 fun) (edebug-after 0 82 completion--capf-misbehave-funs))) nil (edebug-after (edebug-before 84) 86 (message "Completion function %S uses a deprecated calling convention" (edebug-after 0 85 fun))) (edebug-after (edebug-before 87) 90 (let* ((v ...)) (setq completion--capf-misbehave-funs (cons v ...))))))))
  (let ((res (edebug-after (edebug-before 15) 17 (funcall (edebug-after 0 16 fun))))) (edebug-after (edebug-before 18) 92 (cond ((edebug-after (edebug-before 19) 28 (and (edebug-after (edebug-before 20) 22 (consp ...)) (edebug-after (edebug-before 23) 27 (not ...)))) (edebug-after (edebug-before 29) 38 (if (edebug-after (edebug-before 30) 33 (member ... ...)) nil (edebug-after (edebug-before 34) 37 (let* ... ...)))) (edebug-after (edebug-before 39) 68 (and (edebug-after (edebug-before 40) 46 (eq ... ...)) (edebug-after (edebug-before 47) 65 (null ...)) (edebug-after (edebug-before 66) 67 (setq res nil))))) ((edebug-after (edebug-before 69) 78 (not (edebug-after (edebug-before 70) 77 (or ... ...)))) (edebug-after (edebug-before 79) 91 (if (edebug-after (edebug-before 80) 83 (member ... ...)) nil (edebug-after (edebug-before 84) 86 (message "Completion function %S uses a deprecated calling convention" ...)) (edebug-after (edebug-before 87) 90 (let* ... ...))))))) (edebug-after (edebug-before 93) 99 (if (edebug-after 0 94 res) (edebug-after (edebug-before 95) 98 (cons (edebug-after 0 96 fun) (edebug-after 0 97 res))))))
  (if (edebug-after (edebug-before 1) 13 (let* ((val (edebug-after 0 2 which))) (cond ((eq val (quote all)) t) ((eq val (quote safe)) (edebug-after (edebug-before 3) 6 (member (edebug-after 0 4 fun) (edebug-after 0 5 completion--capf-safe-funs)))) ((eq val (quote optimist)) (edebug-after (edebug-before 7) 12 (not (edebug-after ... 11 ...)))) (t nil)))) (edebug-after (edebug-before 14) 100 (let ((res (edebug-after (edebug-before 15) 17 (funcall (edebug-after 0 16 fun))))) (edebug-after (edebug-before 18) 92 (cond ((edebug-after (edebug-before 19) 28 (and ... ...)) (edebug-after (edebug-before 29) 38 (if ... nil ...)) (edebug-after (edebug-before 39) 68 (and ... ... ...))) ((edebug-after (edebug-before 69) 78 (not ...)) (edebug-after (edebug-before 79) 91 (if ... nil ... ...))))) (edebug-after (edebug-before 93) 99 (if (edebug-after 0 94 res) (edebug-after (edebug-before 95) 98 (cons (edebug-after 0 96 fun) (edebug-after 0 97 res))))))))

  completion--capf-wrapper(lisp-completion-at-point all)

  run-hook-wrapped(completion--capf-wrapper lisp-completion-at-point all)
  completion-at-point()

  eshell-complete-lisp-symbol()
  eshell-complete-parse-arguments()
  pcomplete-parse-arguments(nil)
  pcomplete-completions()
  pcomplete-completions-at-point()
  funcall(pcomplete-completions-at-point)
  (let ((res (edebug-after (edebug-before 15) 17 (funcall (edebug-after 0 16 fun))))) (edebug-after (edebug-before 18) 92 (cond ((edebug-after (edebug-before 19) 28 (and (edebug-after (edebug-before 20) 22 (consp ...)) (edebug-after (edebug-before 23) 27 (not ...)))) (edebug-after (edebug-before 29) 38 (if (edebug-after (edebug-before 30) 33 (member ... ...)) nil (edebug-after (edebug-before 34) 37 (let* ... ...)))) (edebug-after (edebug-before 39) 68 (and (edebug-after (edebug-before 40) 46 (eq ... ...)) (edebug-after (edebug-before 47) 65 (null ...)) (edebug-after (edebug-before 66) 67 (setq res nil))))) ((edebug-after (edebug-before 69) 78 (not (edebug-after (edebug-before 70) 77 (or ... ...)))) (edebug-after (edebug-before 79) 91 (if (edebug-after (edebug-before 80) 83 (member ... ...)) nil (edebug-after (edebug-before 84) 86 (message "Completion function %S uses a deprecated calling convention" ...)) (edebug-after (edebug-before 87) 90 (let* ... ...))))))) (edebug-after (edebug-before 93) 99 (if (edebug-after 0 94 res) (edebug-after (edebug-before 95) 98 (cons (edebug-after 0 96 fun) (edebug-after 0 97 res))))))
  (if (edebug-after (edebug-before 1) 13 (let* ((val (edebug-after 0 2 which))) (cond ((eq val (quote all)) t) ((eq val (quote safe)) (edebug-after (edebug-before 3) 6 (member (edebug-after 0 4 fun) (edebug-after 0 5 completion--capf-safe-funs)))) ((eq val (quote optimist)) (edebug-after (edebug-before 7) 12 (not (edebug-after ... 11 ...)))) (t nil)))) (edebug-after (edebug-before 14) 100 (let ((res (edebug-after (edebug-before 15) 17 (funcall (edebug-after 0 16 fun))))) (edebug-after (edebug-before 18) 92 (cond ((edebug-after (edebug-before 19) 28 (and ... ...)) (edebug-after (edebug-before 29) 38 (if ... nil ...)) (edebug-after (edebug-before 39) 68 (and ... ... ...))) ((edebug-after (edebug-before 69) 78 (not ...)) (edebug-after (edebug-before 79) 91 (if ... nil ... ...))))) (edebug-after (edebug-before 93) 99 (if (edebug-after 0 94 res) (edebug-after (edebug-before 95) 98 (cons (edebug-after 0 96 fun) (edebug-after 0 97 res))))))))

  completion--capf-wrapper(pcomplete-completions-at-point optimist)


  run-hook-wrapped(completion--capf-wrapper pcomplete-completions-at-point optimist)
  company--capf-data-real()
  company--capf-data()




In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2020-03-15 built on foo-XPS-13-9360
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:	Ubuntu 18.04.4 LTS

Recent messages:
Result: nil

Result: nil

Result: t

Result: pcomplete-completions-at-point
No apropos matches for ‘eshell-complete-lisp-symbol()’
Type "q" to restore previous buffer.
uncompressing em-cmpl.el.gz...done

Configured using:
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Message #8 received at 40651 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Phil <phil <at> beadling.co.uk>
Cc: 40651 <at> debbugs.gnu.org
Subject: Re: bug#40651: 26.3; eshell using (fn param) syntax breaks lookups
Date: Mon, 23 May 2022 13:12:22 +0200

Phil <phil <at> beadling.co.uk> writes:

> Start with clean emacs install.
> Install company-mode using package installer.
> Start eshell.
> Enable company-mode.
>
> Satisfy yourself that lookups work on paths, eg:
> cd /home/
> Will give a list of completions of directories under home.
>
> Satisfy yourself that lookups work on regular eshell command syntax, eg:
> find-
> Will give a list of completions including find-file, etc.
>
> Now try the same thing but use lisp syntax as supported by eshell, eg:
> (find-
>
> This fails with:
> Completion function pcomplete-completions-at-point uses a deprecated
> calling convention

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

I vaguely seem to remember something like this being fixed in recent
Emacs versions, but I may well be misremembering.  Do you still see this
problem in a recent Emacs version like Emacs 28.1?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 40651 <at> debbugs.gnu.org (full text, mbox):

From: Jim Porter <jporterbugs <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Phil <phil <at> beadling.co.uk>
Cc: 40651 <at> debbugs.gnu.org
Subject: Re: bug#40651: 26.3; eshell using (fn param) syntax breaks lookups
Date: Mon, 23 May 2022 15:35:43 -0700

On 5/23/2022 4:12 AM, Lars Ingebrigtsen wrote:
> I vaguely seem to remember something like this being fixed in recent
> Emacs versions, but I may well be misremembering.  Do you still see this
> problem in a recent Emacs version like Emacs 28.1?

Trying this out myself, it appears to be fixed in 29, but not 28. I'm 
testing with company 0.9.13 (the latest release in GNU ELPA). From the 
Github issue, it seems that some workarounds were added to company, but 
0.9.13 predates that, so I think this is fixed for real in Emacs.

Message #16 received at 40651 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Jim Porter <jporterbugs <at> gmail.com>
Cc: Phil <phil <at> beadling.co.uk>, 40651 <at> debbugs.gnu.org
Subject: Re: bug#40651: 26.3; eshell using (fn param) syntax breaks lookups
Date: Tue, 24 May 2022 14:56:30 +0200

Jim Porter <jporterbugs <at> gmail.com> writes:

> On 5/23/2022 4:12 AM, Lars Ingebrigtsen wrote:
>> I vaguely seem to remember something like this being fixed in recent
>> Emacs versions, but I may well be misremembering.  Do you still see this
>> problem in a recent Emacs version like Emacs 28.1?
>
> Trying this out myself, it appears to be fixed in 29, but not 28. I'm
> testing with company 0.9.13 (the latest release in GNU ELPA). From the
> Github issue, it seems that some workarounds were added to company,
> but 0.9.13 predates that, so I think this is fixed for real in Emacs.

Ah, thanks; I'm closing this bug report, then.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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