From 4360a9cf5c4c75bef2c6edfe1a15279205394a6d Mon Sep 17 00:00:00 2001
From: grwth0 <bnj@grwth0.xyz>
Date: Mon, 24 Oct 2022 19:14:52 -0400
Subject: [PATCH] Made `parser.write` and `parser.parse`'s file-seeking
 approach case-insensitive on all systems.

---
 src/pyfomod/parser.py | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/pyfomod/parser.py b/src/pyfomod/parser.py
index 7fa1b8c..7c046da 100644
--- a/src/pyfomod/parser.py
+++ b/src/pyfomod/parser.py
@@ -254,16 +254,27 @@ def _iterparse(file_path, target):
             target.end(element.tag)
     return target.close()
 
+def get_case_insensitive_path(parent_path: Path, file: str):
+    """
+    Returns a `Path` object matching `parent_path/file`, using `file`'s actual casing "on disk".
+    Works on case-sensitive systems where `file`'s casing may differs from the provided value.
+
+    Returns a `Path` object for `parent_path/file` if no match could be found.
+    """
+    for candidate_file in os.listdir(parent_path):
+        if candidate_file.lower() == file.lower():
+            return parent_path / candidate_file
+    return parent_path / file
 
 def parse(source, warnings=None, lineno=False):
     if isinstance(source, (tuple, list)):
         info, conf = source
     else:
-        path = Path(source) / "fomod"
+        path = get_case_insensitive_path(source, "fomod")
         if not path.is_dir():
             raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), "fomod")
-        info = path / "info.xml"
-        conf = path / "moduleconfig.xml"
+        info = get_case_insensitive_path(path, "info.xml")
+        conf = get_case_insensitive_path(path, "moduleconfig.xml")
         if not info.is_file():
             info = None
         else:
@@ -302,10 +313,10 @@ def write(root, path):
             info = Path(info)
         conf = Path(path[1])
     else:
-        path = Path(path) / "fomod"
+        path = get_case_insensitive_path(Path(path), "fomod")
         path.mkdir(parents=True, exist_ok=True)
-        info = path / "info.xml"
-        conf = path / "moduleconfig.xml"
+        info = get_case_insensitive_path(path, "info.xml")
+        conf = get_case_insensitive_path(path, "moduleconfig.xml")
     if info is not None:
         with info.open("w") as info_f:
             info_f.write(root._info.to_string())