Add deprecation messaging for fix-encoding-pragma

Author: mxr

.pre-commit-hooks.yaml

@@ -145,7 +145,7 @@
     language: python
     types: [text]
 -   id: fix-encoding-pragma
-    name: fix python encoding pragma
+    name: fix python encoding pragma (deprecated)
     description: 'adds # -*- coding: utf-8 -*- to the top of python files.'
     language: python
     entry: fix-encoding-pragma

pre_commit_hooks/fix_encoding_pragma.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import argparse
+import sys
 from typing import IO
 from typing import NamedTuple
 from typing import Sequence
@@ -107,6 +108,12 @@ def _normalize_pragma(pragma: str) -> bytes:
 
 
 def main(argv: Sequence[str] | None = None) -> int:
+    print(
+        "warning: this hook is deprecated and will be removed in a future "
+        "release because py2 is EOL",
+        file=sys.stderr
+    )
+
     parser = argparse.ArgumentParser(
         'Fixes the encoding pragma of python files',
     )