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* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
@ 2020-05-16 23:46 Ryan C. Thompson
  2020-05-16 23:55 ` Dmitry Gutov
  0 siblings, 1 reply; 10+ messages in thread
From: Ryan C. Thompson @ 2020-05-16 23:46 UTC (permalink / raw)
  To: 41340

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

Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --enable-libsystemd --with-pop=yes
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--with-sound=alsa --without-gconf --with-mailutils --with-x=yes
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'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs-mEZBk7/emacs-26.3+1=.
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'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
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Important settings:
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font-render-setting x-toolkit x multi-tty make-network-process emacs)

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(symbols 48 79943 1)
(miscs 40 2767 3163)
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(buffers 992 50))





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-16 23:46 bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help Ryan C. Thompson
@ 2020-05-16 23:55 ` Dmitry Gutov
  2020-05-17  0:12   ` Ryan C. Thompson
  0 siblings, 1 reply; 10+ messages in thread
From: Dmitry Gutov @ 2020-05-16 23:55 UTC (permalink / raw)
  To: Ryan C. Thompson, 41340

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?





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-16 23:55 ` Dmitry Gutov
@ 2020-05-17  0:12   ` Ryan C. Thompson
  2020-05-17  0:57     ` Dmitry Gutov
  0 siblings, 1 reply; 10+ messages in thread
From: Ryan C. Thompson @ 2020-05-17  0:12 UTC (permalink / raw)
  To: Dmitry Gutov, 41340

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.






^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-17  0:12   ` Ryan C. Thompson
@ 2020-05-17  0:57     ` Dmitry Gutov
  2020-05-17  1:16       ` Ryan C. Thompson
  0 siblings, 1 reply; 10+ messages in thread
From: Dmitry Gutov @ 2020-05-17  0:57 UTC (permalink / raw)
  To: Ryan C. Thompson, 41340

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.





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-17  0:57     ` Dmitry Gutov
@ 2020-05-17  1:16       ` Ryan C. Thompson
  2020-05-17  1:32         ` Dmitry Gutov
  0 siblings, 1 reply; 10+ messages in thread
From: Ryan C. Thompson @ 2020-05-17  1:16 UTC (permalink / raw)
  To: Dmitry Gutov, 41340

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.







^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-17  1:16       ` Ryan C. Thompson
@ 2020-05-17  1:32         ` Dmitry Gutov
  2020-05-20 14:12           ` Ryan C. Thompson
  0 siblings, 1 reply; 10+ messages in thread
From: Dmitry Gutov @ 2020-05-17  1:32 UTC (permalink / raw)
  To: Ryan C. Thompson, 41340

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.





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-17  1:32         ` Dmitry Gutov
@ 2020-05-20 14:12           ` Ryan C. Thompson
  2020-05-20 14:20             ` Ryan C. Thompson
  0 siblings, 1 reply; 10+ messages in thread
From: Ryan C. Thompson @ 2020-05-20 14:12 UTC (permalink / raw)
  To: Dmitry Gutov, 41340

[-- Attachment #1: Type: text/plain, Size: 627 bytes --]

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.

[-- Attachment #2: 0001-lisp-ido.el-Respect-completion-auto-help-setting.patch --]
[-- Type: text/plain, Size: 1540 bytes --]

From 6272b4910033c8bc6095da4e2f030dcf79504b52 Mon Sep 17 00:00:00 2001
From: "Ryan C. Thompson" <rct@thompsonclan.org>
Date: Wed, 20 May 2020 10:03:32 -0400
Subject: [PATCH] lisp/ido.el: Respect completion-auto-help setting

This commit makes ido completion respect the user's setting for
`completion-auto-help'. However, note that in addition to t and nil,
`completion-auto-help' can also be set to `lazy', but `lazy' doesn't
make sense for ido, in which available completions are already eagerly
shown in the minibuffer. So ido just treats `lazy' identically to t.
---
 lisp/ido.el | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lisp/ido.el b/lisp/ido.el
index 81883402ad..1ee93a14c3 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -2517,7 +2517,7 @@ If cursor is not at the end of the user input, move to end of input."
       (exit-minibuffer))
 
      ((not ido-matches)
-      (when ido-completion-buffer
+      (when (and ido-completion-buffer completion-auto-help)
 	(call-interactively (setq this-command ido-cannot-complete-command))))
 
      ((and (= 1 (length ido-matches))
@@ -2543,7 +2543,8 @@ If cursor is not at the end of the user input, move to end of input."
 	    (delete-region (minibuffer-prompt-end) (point))
 	    (insert res))
 	;; else nothing to complete
-	(call-interactively (setq this-command ido-cannot-complete-command))
+	(when completion-auto-help
+          (call-interactively (setq this-command ido-cannot-complete-command)))
 	)))))
 
 (defun ido-complete-space ()
-- 
2.26.2


^ permalink raw reply related	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-20 14:12           ` Ryan C. Thompson
@ 2020-05-20 14:20             ` Ryan C. Thompson
  2020-05-20 14:34               ` Ryan C. Thompson
  0 siblings, 1 reply; 10+ messages in thread
From: Ryan C. Thompson @ 2020-05-20 14:20 UTC (permalink / raw)
  To: Dmitry Gutov, 41340

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'.






^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-20 14:20             ` Ryan C. Thompson
@ 2020-05-20 14:34               ` Ryan C. Thompson
  2020-05-20 23:26                 ` Dmitry Gutov
  0 siblings, 1 reply; 10+ messages in thread
From: Ryan C. Thompson @ 2020-05-20 14:34 UTC (permalink / raw)
  To: Dmitry Gutov, 41340

[-- Attachment #1: Type: text/plain, Size: 324 bytes --]

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.


[-- Attachment #2: 0001-lisp-ido.el-Respect-completion-auto-help-setting.patch --]
[-- Type: text/plain, Size: 2213 bytes --]

From 101c03fbee9e1554704e470ce51ee099766b5284 Mon Sep 17 00:00:00 2001
From: "Ryan C. Thompson" <rct@thompsonclan.org>
Date: Wed, 20 May 2020 10:26:08 -0400
Subject: [PATCH] lisp/ido.el: Respect completion-auto-help setting

This commit makes ido completion respect the user's setting for
`completion-auto-help' by default. It does this by defining a wrapper
function `ido-completion-auto-help', which calls `ido-completion-help'
only when `completion-auto-help' is non-nil.

Note that `completion-auto-help' can also be `lazy', but this is
irrelevant to ido, which already shows completions eagerly at all
times. So `lazy' is just treated like t.
---
 lisp/ido.el | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lisp/ido.el b/lisp/ido.el
index 81883402ad..15144f131b 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -499,11 +499,13 @@ This means that \\[ido-complete] must always be followed by \\[ido-exit-minibuff
 even when there is only one unique completion."
   :type 'boolean)
 
-(defcustom ido-cannot-complete-command 'ido-completion-help
+(defcustom ido-cannot-complete-command 'ido-completion-auto-help
   "Command run when `ido-complete' can't complete any more.
 The most useful values are `ido-completion-help', which pops up a
-window with completion alternatives, or `ido-next-match' or
-`ido-prev-match', which cycle the buffer list."
+window with completion alternatives; `ido-completion-auto-help',
+which does the same but respects the value of
+`completion-auto-help'; or `ido-next-match' or `ido-prev-match',
+which cycle the buffer list."
   :type 'function)
 
 
@@ -3926,6 +3928,14 @@ If `ido-change-word-sub' cannot be found in WORD, return nil."
       (when (bobp)
 	(next-completion 1)))))
 
+(defun ido-completion-auto-help ()
+  "Call `ido-completion-help' if `completion-auto-help' is non-nil."
+  (interactive)
+  ;; Note: `completion-auto-help' could also be `lazy', but this value
+  ;; is irrelevant to ido, which is fundamentally eager, so it is
+  ;; treated the same as t.
+  (when completion-auto-help
+    (ido-completion-help)))
 
 (defun ido-completion-help ()
   "Show possible completions in the `ido-completion-buffer'."
-- 
2.26.2


^ permalink raw reply related	[flat|nested] 10+ messages in thread

* bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help
  2020-05-20 14:34               ` Ryan C. Thompson
@ 2020-05-20 23:26                 ` Dmitry Gutov
  0 siblings, 0 replies; 10+ messages in thread
From: Dmitry Gutov @ 2020-05-20 23:26 UTC (permalink / raw)
  To: Ryan C. Thompson, 41340-done

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!





^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2020-05-20 23:26 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-05-16 23:46 bug#41340: 26.3; ido-completing-read doesn't respect completion-auto-help Ryan C. Thompson
2020-05-16 23:55 ` Dmitry Gutov
2020-05-17  0:12   ` Ryan C. Thompson
2020-05-17  0:57     ` Dmitry Gutov
2020-05-17  1:16       ` Ryan C. Thompson
2020-05-17  1:32         ` Dmitry Gutov
2020-05-20 14:12           ` Ryan C. Thompson
2020-05-20 14:20             ` Ryan C. Thompson
2020-05-20 14:34               ` Ryan C. Thompson
2020-05-20 23:26                 ` Dmitry Gutov

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