================
@@ -0,0 +1,298 @@
+#!/usr/bin/env python3
+#
+# 
===-----------------------------------------------------------------------===#
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# 
===-----------------------------------------------------------------------===#
+
+"""
+
+ClangTidy Alphabetical Order Checker
+====================================
+
+Normalize clang-tidy docs with deterministic sorting for linting/tests.
+
+Subcommands:
+  - checks-list: Sort entries in docs/clang-tidy/checks/list.rst csv-table.
+  - release-notes: Sort key sections in docs/ReleaseNotes.rst and de-duplicate
+                   entries in "Changes in existing checks".
+
+Usage:
+  clang-tidy-alphabetical-order-check.py <subcommand> [-i <input rst>] [-o 
<output rst>] [--fix]
+
+Flags:
+  -i/--input   Input file.
+  -o/--output  Write normalized content here; omit to write to stdout.
+  --fix        Rewrite the input file in place. Cannot be combined with 
-o/--output.
+"""
+
+import argparse
+import io
+import os
+import re
+import sys
+from typing import List, Optional, Sequence, Tuple
+
+DOC_LABEL_RN_RE = re.compile(r":doc:`(?P<label>[^`<]+)\s*(?:<[^>]+>)?`")
+DOC_LINE_RE = re.compile(r"^\s*:doc:`(?P<label>[^`<]+?)\s*<[^>]+>`.*$")
+
+
+def script_dir() -> str:
+    return os.path.dirname(os.path.abspath(__file__))
+
+
+def read_text(path: str) -> List[str]:
+    with io.open(path, "r", encoding="utf-8") as f:
+        return f.read().splitlines(True)
+
+
+def write_text(path: str, content: str) -> None:
+    with io.open(path, "w", encoding="utf-8", newline="") as f:
+        f.write(content)
+
+
+def normalize_list_rst(lines: List[str]) -> str:
----------------
vbvictor wrote:

Please add comment what input/output the function has

https://github.com/llvm/llvm-project/pull/166072
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