GNU bug report logs - #51218
28.0.60; python.el: Native completion strikes again

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

From: Carlos Pita <carlosjosepita2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.60; python.el: Native completion strikes again
Date: Thu, 14 Oct 2021 21:27:29 -0300

Hi all,

here's another problem with native completion. If in ~/.inputrc you
customize completion-prefix-display-length to, say, 5, then this won't
work:

    import numpy
    numpy.<complete>

while this still works:

    import numpy as np
    np.<complete>

The reason is that readline will truncate a prefix of the dummy
completions, throwing something like:

...my_completion__[0m[K  ...my_completion__[0m[K

instead of:

0__dummy_completion__[0m[K  1__dummy_completion__[0m[K

I can write a patch passing a different value to
completion-prefix-display-length but this is getting tiresome and I
reiterate my plea for removal of at least the native completion backend.
I argued elsewhere for removal of all automagical stuff that depends on
stdin/out manipulation (i.e. c-a-p and eldoc) but we can start small
removing just the native part for now.

Best regards,
Carlos

---

In GNU Emacs 28.0.60 (build 1, x86_64-apple-darwin20.6.0, NS appkit-2022.60 Version 11.6 (Build 20G165))
 of 2021-10-13 built on Carloss-MacBook-Pro.local
Repository revision: 526ead7a61df9f4763b9a3235a21e719758b98c9
Repository branch: local
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.6

Configured using:
 'configure --without-native-compilation'

Configured features:
ACL DBUS GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY KQUEUE
NS PDUMPER PNG RSVG THREADS TIFF TOOLKIT_SCROLL_BARS XIM ZLIB

Important settings:
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Major mode: Inferior Python

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

From: Carlos Pita <carlosjosepita2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: 28.0.60; python.el: Native completion strikes again
Date: Thu, 14 Oct 2021 21:59:47 -0300

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

In any case, here is the patch to toggle that option off.

[0001-Avoid-replacing-common-prefix-with-ellipsis.patch (text/x-patch, attachment)]

Message #13 received at 51218 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Carlos Pita <carlosjosepita2 <at> gmail.com>
Cc: 51218 <at> debbugs.gnu.org
Subject: Re: bug#51218: 28.0.60; python.el: Native completion strikes again
Date: Sat, 30 Oct 2021 08:53:46 -0700

close 51218 28.1
thanks

Carlos Pita <carlosjosepita2 <at> gmail.com> writes:

> here's another problem with native completion. If in ~/.inputrc you
> customize completion-prefix-display-length to, say, 5, then this won't
> work:
>
>     import numpy
>     numpy.<complete>
>
> while this still works:
>
>     import numpy as np
>     np.<complete>
>
> The reason is that readline will truncate a prefix of the dummy
> completions, throwing something like:
>
> ...my_completion__[0m[K  ...my_completion__[0m[K
>
> instead of:
>
> 0__dummy_completion__[0m[K  1__dummy_completion__[0m[K
>
> I can write a patch passing a different value to
> completion-prefix-display-length but this is getting tiresome and I
> reiterate my plea for removal of at least the native completion backend.
> I argued elsewhere for removal of all automagical stuff that depends on
> stdin/out manipulation (i.e. c-a-p and eldoc) but we can start small
> removing just the native part for now.

Yes, this makes sense, so I have now pushed your below patch to emacs-28
(commit 4a96f32def).

Carlos Pita <carlosjosepita2 <at> gmail.com> writes:

> In any case, here is the patch to toggle that option off.
>
>>From a8caf24c7af05d9d1f92f52632cfe7ccefd3f2dd Mon Sep 17 00:00:00 2001
> From: Carlos Pita <carlosjosepita <at> gmail.com>
> Date: Thu, 14 Oct 2021 21:48:43 -0300
> Subject: [PATCH] Avoid replacing common prefix with ellipsis
>
> * lisp/progmodes/python.el
> (python-shell-completion-native-setup): Configure readline not to
> suppress common prefixes.
> ---
>  lisp/progmodes/python.el | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
> index 54e3789c66..1da7e18635 100644
> --- a/lisp/progmodes/python.el
> +++ b/lisp/progmodes/python.el
> @@ -3711,6 +3711,8 @@ python-shell-completion-native-setup
>              readline.parse_and_bind('tab: complete')
>              # Require just one tab to send output.
>              readline.parse_and_bind('set show-all-if-ambiguous on')
> +            # Avoid replacing common prefix with ellipsis.
> +            readline.parse_and_bind('set completion-prefix-display-length 0')
>
>          print ('python.el: native completion setup loaded')
>      except:

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