GNU bug report logs - #65870
30.0.50; Error in python-mode when try to delete a character in badly-indented code

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

From: Daniel Lopez <daniel.lopez999 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; Error in python-mode when try to delete a character in
 badly-indented code
Date: Mon, 11 Sep 2023 17:36:59 +0100

To reproduce from emacs -Q:
 C-x b hello.py RET
 M-x python-mode
 On the first line, type the word "return", then press the Return key.
 On the second line, type one or more spaces.
 Press Backspace. This triggers the error message:
     python-indent-line: Wrong type argument: wholenump, -4
 and, the last-typed space is not deleted.

Backtrace of the error:
 Debugger entered--Lisp error: (wrong-type-argument wholenump -4)
   indent-line-to(-4)
   python-indent-line(t)
   python-indent-dedent-line()
   python-indent-dedent-line-backspace(1)
   funcall-interactively(python-indent-dedent-line-backspace 1)
   command-execute(python-indent-dedent-line-backspace)

This can also happen with Python keywords/statements that tend to end a
scope, eg. "break" or "raise", as well as "return".

I guess the smart dedenting sees the "return" (or similar statement) at
top-level scope and then tries to move the cursor to a parent scope /
negative column that doesn't exist. Perhaps one of those indent
functions could clamp itself somehow to not do that but I'm not sure
where the best place for that would be.

Daniel



In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.36, cairo version 1.17.8) of 2023-02-21 built on ENO
Repository revision: 098add06eb7d742ff0e6ee0e294931a93a60c71c
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-modules --without-libotf --without-m17n-flt --without-gconf
 --with-native-compilation=yes --with-xinput2 --with-x-toolkit=gtk3
 --without-xaw3d --with-sound=no --with-tree-sitter --without-gpm
 --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -fstack-clash-protection
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 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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Major mode: Python

Minor modes in effect:
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Message #8 received at 65870 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Daniel Lopez <daniel.lopez999 <at> gmail.com>, kobarity <kobarity <at> gmail.com>
Cc: 65870 <at> debbugs.gnu.org
Subject: Re: bug#65870: 30.0.50;
 Error in python-mode when try to delete a character in badly-indented
 code
Date: Sat, 16 Sep 2023 13:05:57 +0300

> Date: Mon, 11 Sep 2023 17:36:59 +0100
> From: Daniel Lopez <daniel.lopez999 <at> gmail.com>
> 
> To reproduce from emacs -Q:
>   C-x b hello.py RET
>   M-x python-mode
>   On the first line, type the word "return", then press the Return key.
>   On the second line, type one or more spaces.
>   Press Backspace. This triggers the error message:
>       python-indent-line: Wrong type argument: wholenump, -4
>   and, the last-typed space is not deleted.
> 
> Backtrace of the error:
>   Debugger entered--Lisp error: (wrong-type-argument wholenump -4)
>     indent-line-to(-4)
>     python-indent-line(t)
>     python-indent-dedent-line()
>     python-indent-dedent-line-backspace(1)
>     funcall-interactively(python-indent-dedent-line-backspace 1)
>     command-execute(python-indent-dedent-line-backspace)
> 
> This can also happen with Python keywords/statements that tend to end a
> scope, eg. "break" or "raise", as well as "return".
> 
> I guess the smart dedenting sees the "return" (or similar statement) at
> top-level scope and then tries to move the cursor to a parent scope /
> negative column that doesn't exist. Perhaps one of those indent
> functions could clamp itself somehow to not do that but I'm not sure
> where the best place for that would be.

Thanks.

kobarity, any suggestions or comments?

Message #11 received at 65870 <at> debbugs.gnu.org (full text, mbox):

From: kobarity <kobarity <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Daniel Lopez <daniel.lopez999 <at> gmail.com>, 65870 <at> debbugs.gnu.org
Subject: Re: bug#65870: 30.0.50;
 Error in python-mode when try to delete a character in badly-indented
 code
Date: Sun, 17 Sep 2023 00:06:58 +0900

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

Eli Zaretskii wrote:
> > Date: Mon, 11 Sep 2023 17:36:59 +0100
> > From: Daniel Lopez <daniel.lopez999 <at> gmail.com>
> > 
> > To reproduce from emacs -Q:
> >   C-x b hello.py RET
> >   M-x python-mode
> >   On the first line, type the word "return", then press the Return key.
> >   On the second line, type one or more spaces.
> >   Press Backspace. This triggers the error message:
> >       python-indent-line: Wrong type argument: wholenump, -4
> >   and, the last-typed space is not deleted.
> > 
> > Backtrace of the error:
> >   Debugger entered--Lisp error: (wrong-type-argument wholenump -4)
> >     indent-line-to(-4)
> >     python-indent-line(t)
> >     python-indent-dedent-line()
> >     python-indent-dedent-line-backspace(1)
> >     funcall-interactively(python-indent-dedent-line-backspace 1)
> >     command-execute(python-indent-dedent-line-backspace)
> > 
> > This can also happen with Python keywords/statements that tend to end a
> > scope, eg. "break" or "raise", as well as "return".
> > 
> > I guess the smart dedenting sees the "return" (or similar statement) at
> > top-level scope and then tries to move the cursor to a parent scope /
> > negative column that doesn't exist. Perhaps one of those indent
> > functions could clamp itself somehow to not do that but I'm not sure
> > where the best place for that would be.
> 
> Thanks.
> 
> kobarity, any suggestions or comments?

Thank you for the report.  The attached is the proposed fix.

[0001-Fix-Python-mode-error-caused-by-incorrect-indentatio.patch (application/octet-stream, attachment)]

Message #14 received at 65870 <at> debbugs.gnu.org (full text, mbox):

From: Daniel Lopez <daniel.lopez999 <at> gmail.com>
To: kobarity <kobarity <at> gmail.com>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 65870 <at> debbugs.gnu.org
Subject: Re: bug#65870: 30.0.50; Error in python-mode when try to delete a
 character in badly-indented code
Date: Sun, 17 Sep 2023 05:06:10 +0100

On 16/09/2023 16:06, kobarity wrote:
> 
> Eli Zaretskii wrote:
>>> Date: Mon, 11 Sep 2023 17:36:59 +0100
>>> From: Daniel Lopez <daniel.lopez999 <at> gmail.com>
>>>
>>> To reproduce from emacs -Q:
>>>    C-x b hello.py RET
>>>    M-x python-mode
>>>    On the first line, type the word "return", then press the Return key.
>>>    On the second line, type one or more spaces.
>>>    Press Backspace. This triggers the error message:
>>>        python-indent-line: Wrong type argument: wholenump, -4
>>>    and, the last-typed space is not deleted.
>>>
>>> Backtrace of the error:
>>>    Debugger entered--Lisp error: (wrong-type-argument wholenump -4)
>>>      indent-line-to(-4)
>>>      python-indent-line(t)
>>>      python-indent-dedent-line()
>>>      python-indent-dedent-line-backspace(1)
>>>      funcall-interactively(python-indent-dedent-line-backspace 1)
>>>      command-execute(python-indent-dedent-line-backspace)
>>>
>>> This can also happen with Python keywords/statements that tend to end a
>>> scope, eg. "break" or "raise", as well as "return".
>>>
>>> I guess the smart dedenting sees the "return" (or similar statement) at
>>> top-level scope and then tries to move the cursor to a parent scope /
>>> negative column that doesn't exist. Perhaps one of those indent
>>> functions could clamp itself somehow to not do that but I'm not sure
>>> where the best place for that would be.
>>
>> Thanks.
>>
>> kobarity, any suggestions or comments?
> 
> Thank you for the report.  The attached is the proposed fix.

On applying the fix to my own installation, I can confirm that it works 
for me. Thanks. :)

Message #17 received at 65870 <at> debbugs.gnu.org (full text, mbox):

From: Jakub Ječmínek <kuba <at> kubajecminek.cz>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: kobarity <kobarity <at> gmail.com>, Daniel Lopez <daniel.lopez999 <at> gmail.com>,
 65870 <at> debbugs.gnu.org
Subject: Re: bug#65870: 30.0.50;
 Error in python-mode when try to delete a character in badly-indented
 code
Date: Sun, 02 Jun 2024 21:08:30 +0000

kobarity <kobarity <at> gmail.com> writes:

> Eli Zaretskii wrote:
>> kobarity, any suggestions or comments?
>
> Thank you for the report.  The attached is the proposed fix.
>
>>From 32f0dbe5f942ffa60f0945d2ffb771db82db5832 Mon Sep 17 00:00:00 2001
> From: kobarity <kobarity <at> gmail.com>
> Date: Sat, 16 Sep 2023 23:14:45 +0900
> Subject: [PATCH] Fix Python mode error caused by incorrect indentation
>
> * lisp/progmodes/python.el (python-indent--calculate-indentation):
> Guard against negative indentation.  (Bug #65870)
>
> * test/lisp/progmodes/python-tests.el
> (python-indent-badly-indented-block-end): New test.
> ---
>  lisp/progmodes/python.el            | 2 +-
>  test/lisp/progmodes/python-tests.el | 9 +++++++++
>  2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
> index 4b940b3f13b..d7e49e225d8 100644
> --- a/lisp/progmodes/python.el
> +++ b/lisp/progmodes/python.el
> @@ -1660,7 +1660,7 @@ python-indent--calculate-indentation
>          (`(:after-block-end . ,start)
>           ;; Subtract one indentation level.
>           (goto-char start)
> -         (- (current-indentation) python-indent-offset))
> +         (max 0 (- (current-indentation) python-indent-offset)))
>          (`(:at-dedenter-block-start . ,_)
>           ;; List all possible indentation levels from opening blocks.
>           (let ((opening-block-start-points
> diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
> index a44a11896f0..f3456030975 100644
> --- a/test/lisp/progmodes/python-tests.el
> +++ b/test/lisp/progmodes/python-tests.el
> @@ -2081,6 +2081,15 @@ python-indent-after-bare-match
>     (python-tests-look-at "else:")
>     (should (= (python-indent-calculate-indentation) 4))))
>  
> +(ert-deftest python-indent-badly-indented-block-end ()
> +  "Test BUG 65870 regression."
> +  (python-tests-with-temp-buffer
> +   "
> +return
> +"
> +   (goto-char (point-max))
> +   (should (= (python-indent-calculate-indentation) 0))))
> +
>  
>  ;;; Filling

Eli, can you please install this?  I can still reproduce the original error.

Message #20 received at 65870 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jakub Ječmínek <kuba <at> kubajecminek.cz>
Cc: kobarity <at> gmail.com, daniel.lopez999 <at> gmail.com, 65870 <at> debbugs.gnu.org
Subject: Re: bug#65870: 30.0.50;
 Error in python-mode when try to delete a character in badly-indented
 code
Date: Mon, 03 Jun 2024 14:25:57 +0300

> Date: Sun, 02 Jun 2024 21:08:30 +0000
> From: Jakub Ječmínek <kuba <at> kubajecminek.cz>
> Cc: kobarity <kobarity <at> gmail.com>, Daniel Lopez <daniel.lopez999 <at> gmail.com>, 65870 <at> debbugs.gnu.org
> 
> kobarity <kobarity <at> gmail.com> writes:
> 
> Eli, can you please install this?  I can still reproduce the original error.

I'm waiting for other people to chime in if they want.  Please be
patient.

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

From: Andreas Röhler <andreas.roehler <at> easy-emacs.de>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#65870: 30.0.50; Error in python-mode when try to delete a
 character in badly-indented code
Date: Tue, 4 Jun 2024 07:12:52 +0200

Am 03.06.24 um 13:25 schrieb Eli Zaretskii:
>> Date: Sun, 02 Jun 2024 21:08:30 +0000
>> From: Jakub Ječmínek <kuba <at> kubajecminek.cz>
>> Cc: kobarity <kobarity <at> gmail.com>, Daniel Lopez <daniel.lopez999 <at> gmail.com>, 65870 <at> debbugs.gnu.org
>>
>> kobarity <kobarity <at> gmail.com> writes:
>>
>> Eli, can you please install this?  I can still reproduce the original error.
> I'm waiting for other people to chime in if they want.  Please be
> patient.
>
>
>
May reproduce a bug:

From col 4 at an empty second line, BACKSPACE  doesn't move. Instead 
sends the error:

indent-line-to: Wrong type argument: wholenump, -4 [2 times]

---

C-h k BACKSPACE:

DEL (translated from <backspace>) runs the command
python-indent-dedent-line-backspace (found in python-mode-map), which
is an interactive byte-code-function in ‘python.el’.

It is bound to DEL.

(python-indent-dedent-line-backspace ARG)

De-indent current line.
Argument ARG is passed to ‘backward-delete-char-untabify’ when
point is not in between the indentation.

---

GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, 
cairo version 1.16.0) of 2024-06-03

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

From: Andreas Röhler <andreas.roehler <at> easy-emacs.de>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#65870: 30.0.50; Error in python-mode when try to delete a
 character in badly-indented code
Date: Tue, 4 Jun 2024 07:45:35 +0200

Am 03.06.24 um 13:25 schrieb Eli Zaretskii:
>> Date: Sun, 02 Jun 2024 21:08:30 +0000
>> From: Jakub Ječmínek <kuba <at> kubajecminek.cz>
>> Cc: kobarity <kobarity <at> gmail.com>, Daniel Lopez <daniel.lopez999 <at> gmail.com>, 65870 <at> debbugs.gnu.org
>>
>> kobarity <kobarity <at> gmail.com> writes:
>>
>> Eli, can you please install this?  I can still reproduce the original error.
> I'm waiting for other people to chime in if they want.  Please be
> patient.
>
>
>

patched against GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ 
Version 3.24.33, cairo version 1.16.0) of 2024-06-04

seems to work

Message #31 received at 65870-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: kobarity <kobarity <at> gmail.com>
Cc: 65870-done <at> debbugs.gnu.org, daniel.lopez999 <at> gmail.com
Subject: Re: bug#65870: 30.0.50;
 Error in python-mode when try to delete a character in badly-indented
 code
Date: Sat, 08 Jun 2024 15:29:19 +0300

> Date: Sun, 17 Sep 2023 00:06:58 +0900
> From: kobarity <kobarity <at> gmail.com>
> Cc: Daniel Lopez <daniel.lopez999 <at> gmail.com>,
> 	65870 <at> debbugs.gnu.org
> 
> Eli Zaretskii wrote:
> > > Date: Mon, 11 Sep 2023 17:36:59 +0100
> > > From: Daniel Lopez <daniel.lopez999 <at> gmail.com>
> > > 
> > > To reproduce from emacs -Q:
> > >   C-x b hello.py RET
> > >   M-x python-mode
> > >   On the first line, type the word "return", then press the Return key.
> > >   On the second line, type one or more spaces.
> > >   Press Backspace. This triggers the error message:
> > >       python-indent-line: Wrong type argument: wholenump, -4
> > >   and, the last-typed space is not deleted.
> > > 
> > > Backtrace of the error:
> > >   Debugger entered--Lisp error: (wrong-type-argument wholenump -4)
> > >     indent-line-to(-4)
> > >     python-indent-line(t)
> > >     python-indent-dedent-line()
> > >     python-indent-dedent-line-backspace(1)
> > >     funcall-interactively(python-indent-dedent-line-backspace 1)
> > >     command-execute(python-indent-dedent-line-backspace)
> > > 
> > > This can also happen with Python keywords/statements that tend to end a
> > > scope, eg. "break" or "raise", as well as "return".
> > > 
> > > I guess the smart dedenting sees the "return" (or similar statement) at
> > > top-level scope and then tries to move the cursor to a parent scope /
> > > negative column that doesn't exist. Perhaps one of those indent
> > > functions could clamp itself somehow to not do that but I'm not sure
> > > where the best place for that would be.
> > 
> > Thanks.
> > 
> > kobarity, any suggestions or comments?
> 
> Thank you for the report.  The attached is the proposed fix.

Thanks, installed on the master branch, and closing the bug.

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