Properly indent Python PEP634 match/case blocks

Python 3.10 introduced the "structural pattern matching" syntax, and
commit 139042eb8629e6fd49b2c3002a8fc4d1aabd174d told font-lock about the
new keywords. This adds them also as block-start statements, to enable
proper indentation of such blocks.

* lisp/progmodes/python.el (python-rx): Add "match" and "case" as
block-start keywords.
* test/lisp/progmodes/python-tests.el (python-indent-after-match-block,
python-indent-after-case-block): New tests to verify indentation of
"match" and "case" blocks (bug#55572).

1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 0761aaebdcc..94297d4ea5b 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -362,6 +362,8 @@ This variant of `rx' supports common Python named REGEXPS."
   `(rx-let ((block-start       (seq symbol-start
                                     (or "def" "class" "if" "elif" "else" "try"
                                         "except" "finally" "for" "while" "with"
+                                        ;; Python 3.10+ PEP634
+                                        "match" "case"
                                         ;; Python 3.5+ PEP492
                                         (and "async" (+ space)
                                              (or "def" "for" "with")))