From 8a982879264e7df75719d2f32057acd6b49b169c Mon Sep 17 00:00:00 2001
From: Huanyi Xie <74809554+xiehuanyi@users.noreply.github.com>
Date: Mon, 5 Oct 2026 13:05:28 +0300
Subject: [PATCH] fix(extract): keep cross-drive diagnostic paths from aborting
 extraction

Assisted-by: OpenAI Codex (GPT-6)
---
 graphify/extract.py                      |  6 +++++-
 tests/test_partial_extraction_warning.py | 19 +++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/graphify/extract.py b/graphify/extract.py
index b463ae388..40c0c72b3 100644
--- a/graphify/extract.py
+++ b/graphify/extract.py
@@ -7790,7 +7790,11 @@ def extract(
                 continue  # empty / whitespace-only: nothing to model, no signal
         except OSError:
             _size = 0
-        _symbolless_files.append((os.path.relpath(str(_p), str(root)).replace("\\", "/"), _size))
+        try:
+            _display_path = os.path.relpath(str(_p), str(root)).replace("\\", "/")
+        except ValueError:
+            _display_path = _p.as_posix()
+        _symbolless_files.append((_display_path, _size))
     if _symbolless_files:
         _total_bytes = sum(size for _, size in _symbolless_files)
         _total_mb = _total_bytes / (1024 * 1024)
diff --git a/tests/test_partial_extraction_warning.py b/tests/test_partial_extraction_warning.py
index eb1ada0eb..f859bcd8a 100644
--- a/tests/test_partial_extraction_warning.py
+++ b/tests/test_partial_extraction_warning.py
@@ -102,6 +102,25 @@ def test_symbolless_warning_names_the_file(tmp_path, capsys):
     assert "may be data rather than code" not in err
 
 
+def test_symbolless_warning_survives_a_cross_drive_path(tmp_path, capsys, monkeypatch):
+    import graphify.extract as ex
+
+    source = _data_only_fixture(tmp_path)
+    original_relpath = ex.os.path.relpath
+
+    def cross_drive_relpath(path, start=None):
+        if str(path) == str(source) and str(start) == str(tmp_path):
+            raise ValueError("path is on mount 'D:', start on mount 'C:'")
+        return original_relpath(path, start)
+
+    monkeypatch.setattr(ex.os.path, "relpath", cross_drive_relpath)
+    result = extract([source], root=tmp_path)
+    assert any(node.get("label") == "data.js" for node in result["nodes"])
+    err = capsys.readouterr().err
+    assert "yielded no symbols" in err
+    assert source.as_posix() in err
+
+
 def test_symbolless_warning_is_silent_for_an_empty_init(tmp_path, capsys):
     """An empty __init__.py is symbol-less *code*, ubiquitous in Python
     packages. It has nothing to model, so the warning must stay silent rather