Validate PEP created dates and update linters (#1886)

* Check created date exists & matches format, and fix non-conforming

* Automatically fix mixed EoLs on checkin and in one PEP

* Add rst-directive-colons check, fix issue it found and refine regex

.gitattributes

@@ -0,0 +1,2 @@
+# Ensure files are always checked in with consistent line endings
+* text eol=lf

.pre-commit-config.yaml

@@ -1,6 +1,34 @@
 repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.4.0
+    hooks:
+    - id: mixed-line-ending
+      name: Normalize mixed line endings
+      args: [--fix=lf]
+
   - repo: https://github.com/pre-commit/pygrep-hooks
-    rev: v1.7.1
+    rev: v1.8.0
     hooks:
       - id: rst-backticks
       - id: rst-inline-touching-normal
+        files: '^pep-\d+\.txt|\.rst$'
+        types: [text]
+      - id: rst-directive-colons
+        files: '^pep-\d+\.txt|\.rst$'
+        types: [text]
+
+  - repo: local
+    hooks:
+      - id: check-created-exists
+        name: "Check all PEPs have created date"
+        language: pygrep
+        entry: '^Created:'
+        args: ['--negate']
+        files: '^pep-\d+\.(rst|txt)$'
+        types: [text]
+      - id: validate-created
+        name: "Validate created dates"
+        language: pygrep
+        entry: '^Created:(?:(?! +([0-2][0-9]|(3[01]))-(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-(199[0-9]|20[0-9][0-9])( \(|$)))'
+        files: '^pep-\d+\.(rst|txt)$'
+        types: [text]

pep-0540.txt

@@ -263,7 +263,7 @@ If stdin and/or stdout is redirected to a pipe, ``sys.stdin`` and/or
 But in UTF-8 Mode, ``sys.stdin`` and ``sys.stdout`` always use the UTF-8
 encoding.
 
-.. note:
+.. note::
    There is no POSIX locale on Windows. The ANSI code page is used as
    the locale encoding, and this code page never uses the ASCII
    encoding.

pep-0653.rst

@@ -4,7 +4,7 @@ Author: Mark Shannon <mark@hotpy.org>
 Status: Draft
 Type: Standards Track
 Content-Type: text/x-rst
-Created: 9-Feb-2021
+Created: 09-Feb-2021
 Post-History: 18-Feb-2021
 
 

pep-0656.rst

@@ -7,7 +7,7 @@ Discussions-To: https://discuss.python.org/t/7165
 Status: Draft
 Type: Informational
 Content-Type: text/x-rst
-Created: 2021-03-17
+Created: 17-Mar-2021
 
 
 Abstract