(major-mode-remap(-defaults)): New var and function (bug#69191)

While `major-mode-remap-alist` provides a way for users to indicate the
major mode of their choice, we need a similar variable for the
use of packages.

This patch adds a new `major-mode-remap-defaults` and changes various
packages to obey it or make use of it.
I think it nicely cleans the regexp duplication between CC-mode and
`c-ts-mode.el` and also makes it easier/cleaner for users to override
the changes made by `*-ts-mode.el`.

* lisp/files.el (major-mode-remap-defaults): New variable.
(major-mode-remap): New function.
(set-auto-mode-0): Use it.
* doc/lispref/modes.texi (Auto Major Mode): Document them.

* lisp/textmodes/tex-mode.el (tex--redirect-to-submode):
Use `major-mode-remap`.
(major-mode-remap-defaults): Set it to remap AUCTeX modes by default.
* lisp/progmodes/ruby-ts-mode.el (auto-mode-alist): Leave it alone.
(major-mode-remap-defaults): Set this one instead.
* lisp/progmodes/c-ts-mode.el (c-or-c++-ts-mode): Use `major-mode-remap`.
(auto-mode-alist): Leave it alone.
(major-mode-remap-defaults): Set this one instead.
* lisp/org/ox.el (org-export-to-buffer): Modernize docstring accordingly.
* lisp/progmodes/cc-mode.el (c-or-c++-mode):
* lisp/org/ox-latex.el (org-latex-export-as-latex):
* lisp/org/ox-koma-letter.el (org-koma-letter-export-as-latex):
* lisp/org/ox-beamer.el (org-beamer-export-as-latex):
Use `major-mode-remap` when available.

1 files changed, 4 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 792e178c3b6..41bff184676 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1595,6 +1595,10 @@ values.
 
 * Lisp Changes in Emacs 30.1
 
+** New var 'major-mode-remap-defaults' and function 'major-mode-remap'.
+The first is like Emacs-29's 'major-mode-remap-alist' but to be set by
+packages (instead of users).  The second looks up those two variables.
+
 +++
 ** Pcase's functions (in 'pred' and 'app') can specify the argument position.
 For example, instead of '(pred (< 5))' you can write '(pred (> _ 5))'.