GNU bug report logs - #41340
26.3; ido-completing-read doesn't respect completion-auto-help

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

From: "Ryan C. Thompson" <rct <at> thompsonclan.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.3; ido-completing-read doesn't respect completion-auto-help
Date: Sat, 16 May 2020 19:46:15 -0400

When completion-auto-help is nil, ido-completing-read still pops up a 
completions buffer when pressing TAB on an ambiguous completion. This 
can be fixed manually by setting ido-cannot-complete-command to ignore, 
but it might be nice if ido-completion-help (the default value of 
ido-cannot-complete-command) was a no-op when completion-auto-helpis nil.

This was originally reported to me in the ido-completing-read+ issue 
tracker: 
https://github.com/DarwinAwardWinner/ido-completing-read-plus/issues/172

It would be easy enough for me to advise ido-completion-help to 
implement the above suggestion (and I probably will need to anyway, for 
the sake of older Emacsen, at least within ido-cr+ completion). However, 
this seems like something that can and probably should be fixed in ido 
itself.

Example code to reproduce the bug:

(let ((completion-auto-help nil))
  (ido-completing-read "Pick one: " '("apple" "appstore" "application") 
nil t nil nil "apple"))

Type "ap" and then press TAB repeatedly. The completions buffer will 
appear despite completion-auto-help being nil. If you replace replace 
ido-completing-read with completing-read-default and do the same, the 
completions buffer does not appear, as expected.



In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll 
bars)
of 2020-03-26, modified by Debian built on lcy01-amd64-020
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Ubuntu 20.04 LTS

Recent messages:

Mark set
ido-completion-help <at> respect-completion-auto-help
Quit [3 times]
Mark set
[3 times]
Quit [5 times]
ido-completion-help <at> respect-completion-auto-help
Quit [6 times]
Killed inactive buffer: *Ido Completions*.

Configured using:
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Message #8 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: "Ryan C. Thompson" <rct <at> thompsonclan.org>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Sun, 17 May 2020 02:55:04 +0300

Hi Ryan,

On 17.05.2020 02:46, Ryan C. Thompson wrote:
> This can be fixed manually by setting ido-cannot-complete-command to 
> ignore, but it might be nice if ido-completion-help (the default value 
> of ido-cannot-complete-command) was a no-op when completion-auto-helpis 
> nil.

Care to propose a patch?

Message #11 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: "Ryan C. Thompson" <rct <at> thompsonclan.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Sat, 16 May 2020 20:12:51 -0400

On 5/16/20 7:55 PM, Dmitry Gutov wrote:
> Hi Ryan,
>
> On 17.05.2020 02:46, Ryan C. Thompson wrote:
>> This can be fixed manually by setting ido-cannot-complete-command to 
>> ignore, but it might be nice if ido-completion-help (the default 
>> value of ido-cannot-complete-command) was a no-op when 
>> completion-auto-helpis nil.
>
> Care to propose a patch?

One minor wrinkle is that completion-auto-help has 3 valid values: nil, 
t, and lazy. I'm not sure I understand the difference between t and 
lazy, so I'm also unsure as to how to apply them to ido. In my testing, 
both t and lazy seem to result in the identical behavior in 
completing-read-default.

Message #14 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: "Ryan C. Thompson" <rct <at> thompsonclan.org>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Sun, 17 May 2020 03:57:45 +0300

On 17.05.2020 03:12, Ryan C. Thompson wrote:
> 
> One minor wrinkle is that completion-auto-help has 3 valid values: nil, 
> t, and lazy. I'm not sure I understand the difference between t and 
> lazy, so I'm also unsure as to how to apply them to ido. In my testing, 
> both t and lazy seem to result in the identical behavior in 
> completing-read-default.

When it's `lazy', you need to press TAB twice to see the completions 
list. At first it'll just say "Next char is not unique".

If you can honor both values, that would be best, but even making the 
nil/non-nil distinction will be an improvement, sounds like.

Message #17 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: "Ryan C. Thompson" <rct <at> thompsonclan.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Sat, 16 May 2020 21:16:54 -0400

On 5/16/20 8:57 PM, Dmitry Gutov wrote:
> On 17.05.2020 03:12, Ryan C. Thompson wrote:
>>
>> One minor wrinkle is that completion-auto-help has 3 valid values: 
>> nil, t, and lazy. I'm not sure I understand the difference between t 
>> and lazy, so I'm also unsure as to how to apply them to ido. In my 
>> testing, both t and lazy seem to result in the identical behavior in 
>> completing-read-default.
>
> When it's `lazy', you need to press TAB twice to see the completions 
> list. At first it'll just say "Next char is not unique".
>
> If you can honor both values, that would be best, but even making the 
> nil/non-nil distinction will be an improvement, sounds like.

Hmm, that's not the behavior I see, even in emacs -Q. Regardless of 
whether it's `t' or `lazy', the first TAB press completes any common 
prefix, and then the very next TAB press shows the completions buffer. I 
never get the "Next char is not unique" message (I checked the Messages 
buffer to be sure).

I don't have time to dig deeper into this right now, but I'll come back 
to it, probably on Monday.

Message #20 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: "Ryan C. Thompson" <rct <at> thompsonclan.org>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Sun, 17 May 2020 04:32:56 +0300

On 17.05.2020 04:16, Ryan C. Thompson wrote:
> Hmm, that's not the behavior I see, even in emacs -Q.

That's odd.

I get it in 'M-x describe-function', at least.

Message #23 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: "Ryan C. Thompson" <rct <at> thompsonclan.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Wed, 20 May 2020 10:12:07 -0400

[Message part 1 (text/plain, inline)]

On 5/16/20 9:32 PM, Dmitry Gutov wrote:
> On 17.05.2020 04:16, Ryan C. Thompson wrote:
>> Hmm, that's not the behavior I see, even in emacs -Q.
>
> That's odd.
>
> I get it in 'M-x describe-function', at least.
Ok, I figured out the difference between t and `lazy', and I determined 
that the lazy setting is not meaningful for ido, since ido already 
eagerly shows completions at all times. Hence, the attached patch 
teaches ido how to respect `completion-auto-help' being set to nil but 
doesn't make any special allowance for `lazy'. The existing behavior of 
ido is already correct when `completion-auto-help' is non-nil.

[0001-lisp-ido.el-Respect-completion-auto-help-setting.patch (text/plain, attachment)]

Message #26 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: "Ryan C. Thompson" <rct <at> thompsonclan.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Wed, 20 May 2020 10:20:06 -0400

On 5/20/20 10:12 AM, Ryan C. Thompson wrote:
> Ok, I figured out the difference between t and `lazy', and I 
> determined that the lazy setting is not meaningful for ido, since ido 
> already eagerly shows completions at all times. Hence, the attached 
> patch teaches ido how to respect `completion-auto-help' being set to 
> nil but doesn't make any special allowance for `lazy'. The existing 
> behavior of ido is already correct when `completion-auto-help' is 
> non-nil.

Actually, on further consideration, I've realized a problem with this 
approach: this patch uses the value of `completion-auto-help' to 
determine whether to call `ido-cannot-complete-command'. However, the 
ido documentation mentions the possibility of setting 
`ido-cannot-complete-command' to `ido-next-match', which allows the user 
to cycle through available completions with repeated TAB presses. This 
patch kind of breaks that, in the sense that `completion-auto-help' ends 
up affecting something totally unrelated.

Perhaps an better approach would be to define an auxiliary wrapper 
function that only calls `ido-completion-help' if `completion-auto-help' 
is non-nil, and set that as the default for `ido-cannot-complete-command'.

Message #29 received at 41340 <at> debbugs.gnu.org (full text, mbox):

From: "Ryan C. Thompson" <rct <at> thompsonclan.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>, 41340 <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Wed, 20 May 2020 10:34:06 -0400

[Message part 1 (text/plain, inline)]

On 5/20/20 10:20 AM, Ryan C. Thompson wrote:
> Perhaps an better approach would be to define an auxiliary wrapper 
> function that only calls `ido-completion-help' if 
> `completion-auto-help' is non-nil, and set that as the default for 
> `ido-cannot-complete-command'.

Here is a patch to implement the suggestion above.

[0001-lisp-ido.el-Respect-completion-auto-help-setting.patch (text/plain, attachment)]

Message #34 received at 41340-done <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: "Ryan C. Thompson" <rct <at> thompsonclan.org>, 41340-done <at> debbugs.gnu.org
Subject: Re: bug#41340: 26.3; ido-completing-read doesn't respect
 completion-auto-help
Date: Thu, 21 May 2020 02:26:03 +0300

Version: 28.1

On 20.05.2020 17:34, Ryan C. Thompson wrote:
> On 5/20/20 10:20 AM, Ryan C. Thompson wrote:
>> Perhaps an better approach would be to define an auxiliary wrapper 
>> function that only calls `ido-completion-help' if 
>> `completion-auto-help' is non-nil, and set that as the default for 
>> `ido-cannot-complete-command'.
> 
> Here is a patch to implement the suggestion above.

Pushed to master, thanks!

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