Lowercase distribution name in wheel filename and .dist-info folder name

Author: takluyver

flit_core/flit_core/common.py

@@ -407,7 +407,7 @@ def normalize_dist_name(name: str, version: str) -> str:
 
     See https://packaging.python.org/specifications/binary-distribution-format/#escaping-and-unicode
     """
-    normalized_name = re.sub(r'[-_.]+', '_', name, flags=re.UNICODE)
+    normalized_name = re.sub(r'[-_.]+', '_', name, flags=re.UNICODE).lower()
     assert check_version(version) == version
     assert '-' not in version, 'Normalized versions can’t have dashes'
     return '{}-{}'.format(normalized_name, version)

tests/samples/altdistname/pyproject.toml

@@ -7,5 +7,5 @@ module = "package1"
 author = "Sir Robin"
 author-email = "robin@camelot.uk"
 home-page = "http://github.com/sirrobin/package1"
-dist-name = "package-dist1"
+dist-name = "package-Dist1"