bug#73506: 31.0.50; File mode specification error caused by python.el auto-mode-alist

bug#73506: 31.0.50; File mode specification error caused by python.el auto-mode-alist

[Mark Barton]

When opening Python files I would get a file-mode error and be in Fundamental mode. Looks like the below commit changed the python--auto-mode-alist-regexp constant and when adding to the auto-mode-alist for python-ts-mode it would put the name of the constant in the list rather than the value.

Here is how the auto-mode-alist looked for the python related modes:
#+begin_example
((python--auto-mode-alist-regexp . python-ts-mode)
 ("\\.\\(?:p\\(?:th\\|y[iw]?\\)\\)\\'" . python-mode))
 #+end_example

Commit where the change was made:
#+begin_src diff
2f485e68ff96cc66a17df2c0a58e272bbfc24765
Author:     Stefan Kangas <stefankangas@gmail.com>
AuthorDate: Thu Sep 26 17:04:31 2024 +0200
Commit:     Stefan Kangas <stefankangas@gmail.com>
CommitDate: Thu Sep 26 17:04:31 2024 +0200

Parent:     4c567892e04 * Clean-up unused condition-case
Merged:     emacs-29
Contained:  master
Follows:    emacs-29.1.90 (174004)

Add Python "*.pth" files to auto-mode-alist

\* lisp/progmodes/python.el (python--auto-mode-alist-regexp): New
variable.
(auto-mode-alist, python-ts-mode): Use above new variable.

1 file changed, 9 insertions(+), 2 deletions(-)
lisp/progmodes/python.el | 11 +++++++++--

modified   lisp/progmodes/python.el
@@ -293,8 +293,15 @@ outline-heading-end-regexp
 (autoload 'comint-mode "comint")
 (autoload 'help-function-arglist "help-fns")
 
+(defconst python--auto-mode-alist-regexp
+  (rx "." (or "py"
+              "pth"                     ; Python Path Configuration File
+              "pyi"                     ; Python Stub File (PEP 484)
+              "pyw")                    ; MS-Windows specific extension
+      eos))
+
 ;;;###autoload
-(add-to-list 'auto-mode-alist (cons (purecopy "\\.py[iw]?\\'") 'python-mode))
+(add-to-list 'auto-mode-alist (cons python--auto-mode-alist-regexp 'python-mode))
 ;;;###autoload
 (add-to-list 'interpreter-mode-alist (cons (purecopy "python[0-9.]*") 'python-mode))
 
@@ -7208,7 +7215,7 @@ python-ts-mode
     (when python-indent-guess-indent-offset
       (python-indent-guess-indent-offset))
 
-    (add-to-list 'auto-mode-alist '("\\.py[iw]?\\'" . python-ts-mode))
+    (add-to-list 'auto-mode-alist '(python--auto-mode-alist-regexp . python-ts-mode))
     (add-to-list 'interpreter-mode-alist '("python[0-9.]*" . python-ts-mode))))
 
 (derived-mode-add-parents 'python-ts-mode '(python-mode))

#+end_src


My fix to get it to work:
@@ -7216,7 +7216,7 @@ python-ts-mode
     (when python-indent-guess-indent-offset
       (python-indent-guess-indent-offset))
 
-    (add-to-list 'auto-mode-alist '(python--auto-mode-alist-regexp . python-ts-mode))
+    (add-to-list 'auto-mode-alist `(,python--auto-mode-alist-regexp . python-ts-mode))
     (add-to-list 'interpreter-mode-alist '("python[0-9.]*" . python-ts-mode))))
 
 (derived-mode-add-parents 'python-ts-mode '(python-mode))

--text follows this line--




In GNU Emacs 31.0.50 (build 1, x86_64-apple-darwin23.6.0, NS
appkit-2487.70 Version 14.7 (Build 23H124)) of 2024-09-26 built on
C02FM1E2MD6T
Repository revision: e776903b31cf2b2d21d91cbc7d6b7dbc1e9d442f
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2487
System Description:  macOS 14.7

Configured using:
'configure --with-native-compilation --with-xwidgets
--with-tree-sitter'

Configured features:
ACL DBUS GIF GLIB GMP GNUTLS JPEG LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS ZLIB

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

Major mode: Python

Minor modes in effect:
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  indent-bars-mode: t
  global-jinx-mode: t
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  rainbow-delimiters-mode: t
  org-media-note-mode: t
  display-line-numbers-mode: t
  engine-mode: t
  erc-autojoin-mode: t
  org-super-agenda-mode: t
  global-org-modern-mode: t
  global-atomic-chrome-edit-mode: t
  dired-async-mode: t
  hexl-follow-ascii: t
  consult-eglot-embark-mode: t
  eglot--managed-mode: t
  pyvenv-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  eros-mode: t
  global-treesit-fold-indicators-mode: t
  treesit-fold-indicators-mode: t
  global-treesit-fold-mode: t
  treesit-fold-mode: t
  global-ligature-mode: t
  ligature-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  whole-line-or-region-global-mode: t
  whole-line-or-region-local-mode: t
  delete-selection-mode: t
  git-identity-magit-mode: t
  global-git-gutter-mode: t
  git-gutter-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  global-auto-revert-mode: t
  server-mode: t
  wrap-region-global-mode: t
  wrap-region-mode: t
  global-corfu-mode: t
  corfu-mode: t
  flymake-mode: t
  marginalia-mode: t
  savehist-mode: t
  vertico-mode: t
  popper-echo-mode: t
  popper-mode: t
  pulsar-global-mode: t
  pulsar-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-history-mode: t
  tab-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
  window-divider-mode: t
  minibuffer-regexp-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/Users/bartm002/.emacs.d/elpa/indent-bars/indent-bars hides /Users/bartm002/.emacs.d/elpa/indent-bars-ts/indent-bars
/Users/bartm002/.emacs.d/elpa/indent-bars/indent-bars-ts hides /Users/bartm002/.emacs.d/elpa/indent-bars-ts/indent-bars-ts
/Users/bartm002/.emacs.d/elpa/transient-20240918.1138/transient hides /Applications/Emacs.app/Contents/Resources/lisp/transient
/Users/bartm002/.emacs.d/elpa/bind-key-20230203.2004/bind-key hides /Applications/Emacs.app/Contents/Resources/lisp/bind-key

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theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads xwidget-internal dbusbind
kqueue cocoa ns lcms2 multi-tty make-network-process native-compile
emacs)

Memory information:
((conses 16 2480530 377114) (symbols 48 90206 1823)
(strings 32 451042 23785) (string-bytes 1 13145172)
(vectors 16 228429) (vector-slots 8 3475604 315239)
(floats 8 1465 2450) (intervals 56 109803 128) (buffers 992 34))

bug#73506: 31.0.50; File mode specification error caused by python.el auto-mode-alist

[Stefan Kangas]

Mark Barton <mbarton98@gmail.com> writes:

> When opening Python files I would get a file-mode error and be in
> Fundamental mode. Looks like the below commit changed the
> python--auto-mode-alist-regexp constant and when adding to the
> auto-mode-alist for python-ts-mode it would put the name of the
> constant in the list rather than the value.

Thanks for the bug report.

This was already fixed by Gerd in commit b9d103c16e929, so I'm closing
this bug.