fix: style override on Windows (#422)

* fix: use dot-slash also in Windows
* docs: for Windows users

docs/configuration.rst

@@ -238,3 +238,6 @@ Use ``./`` to indicate the local style:
         "https://example.com/on/the/web/remote-style.toml",
         "./my-local-style.toml",
     ]
+
+For Windows users: even though the path separator is a backslash, use the example above as-is.
+The "dot-slash" is a convention for Nitpick_ to know this is a local style file.

src/nitpick/constants.py

@@ -1,6 +1,4 @@
 """Constants."""
-import os
-
 import jmespath
 
 PROJECT_OWNER = "andreoliwa"
@@ -61,9 +59,10 @@
 NITPICK_STYLES_INCLUDE_JMEX = jmespath.compile("nitpick.styles.include")
 NITPICK_MINIMUM_VERSION_JMEX = jmespath.compile("nitpick.minimum_version")
 
-#: Dot/slash is used to indicate a local style file
+# Dot/slash is just a convention to indicate a local style file;
+# the same pair of characters should be used on Windows, even though the path separator is different
 DOT = "."
-SLASH = os.path.sep
+SLASH = "/"
 DOT_SLASH = f"{DOT}{SLASH}"
 
 GIT_AT_REFERENCE = "@"

tests/test_style.py

@@ -420,7 +420,6 @@ def test_relative_style_on_urls(tmp_path):
 
 
 @responses.activate
-@XFAIL_ON_WINDOWS
 def test_local_style_should_override_settings(tmp_path):
     """Don't build relative URLs from local file names (starting with "./")."""
     remote_url = "https://example.com/remote-style.toml"