Use python stdlib for date printing

Drops the use of the heavyweight Babel library for this single task. The
result is not thread-safe, but librpm probably isn't either and
rpmautospec is usually run in its own process.

This adds a simple context manager to changelog.py that allows us to set
the LC_TIME within a context block, so we don't forget to change it
back.

Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>

pyproject.toml

@@ -45,7 +45,6 @@ exclude = [
 [tool.poetry.dependencies]
 python = "^3.9"
 rpmautospec_core = "^0.1.4"
-babel = "^2.8"
 pygit2 = [
     { version = "^1.4.0,<1.16.0", python = ">=3.9.0,<3.10.0" },
     { version = "^1.4.0", python = "^3.10.0" }

rpmautospec/changelog.py

@@ -1,9 +1,8 @@
+import locale
 import re
 from enum import Enum, auto
 from textwrap import TextWrapper
 
-from babel.dates import format_datetime
-
 
 class CommitLogParseState(int, Enum):
     before_subject = auto()
@@ -13,6 +12,18 @@ class CommitLogParseState(int, Enum):
     body = auto()
 
 
+class TimeLocaleManager:
+    def __init__(self, localename):
+        self.name = localename
+
+    def __enter__(self):
+        self.orig = locale.setlocale(locale.LC_TIME)
+        locale.setlocale(locale.LC_TIME, self.name)
+
+    def __exit__(self, exc_type, exc_value, traceback):  # pylint: disable=unused-argument
+        locale.setlocale(locale.LC_TIME, self.orig)
+
+
 class ChangelogEntry(dict):
     """Dictionary holding changelog entry details."""
 
@@ -98,9 +109,9 @@ def format(self, **overrides):
             # verbatim data from the changed `changelog` file
             return entry_info["data"]
 
-        changelog_date = format_datetime(
-            entry_info["timestamp"], format="EEE MMM dd y", locale="en"
-        )
+        # WARNING: the following is NOT thread-safe
+        with TimeLocaleManager("en_US"):
+            changelog_date = entry_info["timestamp"].strftime("%a %b %d %Y")
 
         if entry_info["epoch-version"]:
             changelog_evr = f" - {entry_info['epoch-version']}"