From f1bc60aa1e0fea64b4fa4929f224e1fcc17b0d29 Mon Sep 17 00:00:00 2001
From: Rehan Durrani <rehan@ponder.io>
Date: Thu, 2 Jun 2022 19:17:28 -0700
Subject: [PATCH] Add support for windows

Signed-off-by: Rehan Durrani <rehan@ponder.io>
---
 modin/core/io/utils.py       | 8 ++++++--
 modin/pandas/test/test_io.py | 6 +++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/modin/core/io/utils.py b/modin/core/io/utils.py
index 56cc7f487b2..1fd171970bd 100644
--- a/modin/core/io/utils.py
+++ b/modin/core/io/utils.py
@@ -17,7 +17,7 @@
 import re
 import fsspec
 
-IS_FILE_ONLY_REGEX = re.compile("[^\/]*\.\w+")  # noqa: W605
+IS_FILE_ONLY_REGEX = re.compile(f"[^\\{os.sep}]*\.\w+")  # noqa: W605
 
 
 def is_local_path(path) -> bool:
@@ -45,13 +45,17 @@ def is_local_path(path) -> bool:
             parent_dir = os.getcwd()
         else:
             # If we are passed a full path, we want to remove the filename from it.
-            parent_dir = "/".join(path.split("/")[:-1])
+            parent_dir = os.sep.join(path.split(os.sep)[:-1])
         fs = fsspec.core.url_to_fs(parent_dir)[0]  # Grab just the FileSystem object
         if hasattr(
             fs, "local_file"
         ):  # If the FS does not have the `local_file` attr, it is not local.
             # We still need to check that it is not a mounted file - as fsspec treats mounted
             # files the same as local ones, but we want to distinguish between local and mounted.
+            if os.name == "nt" and parent_dir[:3] == "D:\\":
+                # In Windows, os.path.abspath(os.sep) will give us the C Drive, but we want the
+                # D drive to also be marked as local.
+                return True
             local_device_id = os.stat(os.path.abspath(os.sep)).st_dev
             path_device_id = os.stat(parent_dir).st_dev
             return path_device_id == local_device_id
diff --git a/modin/pandas/test/test_io.py b/modin/pandas/test/test_io.py
index 69d2cba3a0a..ac9b522e630 100644
--- a/modin/pandas/test/test_io.py
+++ b/modin/pandas/test/test_io.py
@@ -2393,7 +2393,11 @@ def test_is_local_path():
     assert is_local_path(
         os.getcwd()
     ), "Current Working Directory incorrectly flagged as not local!"
-    new_file = os.getcwd() + "/modin-example-file"
+    new_file = os.getcwd() + "/modin-example-file.extension"
     assert is_local_path(
         new_file
     ), "Non-existent file under current working directory incorrectly flagged as not local!"
+    new_file_in_curr_dir = "modin-example-file.extension"
+    assert is_local_path(
+        new_file_in_curr_dir,
+    ), "Non-existent file without absolute path incorrectly flagged as not local!"