GNU bug report logs - #72750
29.3; indent-region changes semantics of python code

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

From: Michael Arndt <michael <at> rndt.dev>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3; indent-region changes semantics of python code
Date: Wed, 21 Aug 2024 20:06:52 +0200

Hi,

I have a problem when indenting python files. There seems to be a case
when using indent-region changes the semantics of the python code. When
there is no blank line after an if-statement, the next line becomes part
of the if statement.

The problem can be reproduced by the following steps:

1. Start emacs -Q
2. Create a python file with the following contents:

if False:
     print("output1")
print("output2")

3. Use M-x mark-whole-buffer
4. Use M-x indent-region
5. The file contents change into:

if False:
     print("output1")
     print("output2")

The problem can be avoided by adding a blank line after the if statement.
Because I use a custom indentation function that calls (indent-region
(point-min) (point-max)) this can happen pretty quickly. Is this a
limitation of python-indent-region?

Greetings
Michael


In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.33,
cairo version 1.18.0) of 2024-04-02 built on titan
Repository revision: ae8f815613c2e072e92aa8fe7b4bcf2fdabc7408
Repository branch: HEAD
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Debian GNU/Linux trixie/sid

Configured using:
'configure CFLAGS=-O3 --with-json --with-native-compilation
--without-xinput2 --with-modules --prefix=/usr/local
--with-tree-sitter'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG
SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE
XIM XPM GTK2 ZLIB

Important settings:
value of $LC_TIME: de_DE.UTF-8
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t

Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 77191 7214)
(symbols 48 7170 0)
(strings 32 19723 1946)
(string-bytes 1 598864)
(vectors 16 15710)
(vector-slots 8 328515 15479)
(floats 8 39 46)
(intervals 56 242 0)
(buffers 984 12))

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