fix: preserve inverted gitignore traversal

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     "einops>=0.8.2",
     "typer>=0.9.0",
     "msgspec>=0.19.0",
-    "pathspec>=0.12.1",
+    "pathspec>=0.12.1,<1.0",
     "pyyaml>=6.0",
     "questionary>=2.0.0",
 ]

tests/test_file_walk.py

@@ -0,0 +1,41 @@
+"""Tests for shared source-file walking and gitignore filtering."""
+
+from pathlib import Path
+
+from cocoindex_code.file_walk import build_matcher, iter_included_files
+
+
+def test_inverted_gitignore_keeps_source_directories_traversable(tmp_path: Path) -> None:
+    """An ignore-all file can reopen directories and selected source extensions."""
+    (tmp_path / ".gitignore").write_text(
+        "\n".join(
+            [
+                "*",
+                "!*/",
+                "!*.cpp",
+                "!*.h",
+                "Content/",
+                "",
+            ]
+        )
+    )
+
+    files = {
+        "Root.cpp": "int root;\n",
+        "Engine/Source/kept.cpp": "int kept;\n",
+        "Engine/Source/kept.h": "#pragma once\n",
+        "Engine/Source/ignored.bin": "generated\n",
+        "Content/reignored.cpp": "int generated;\n",
+    }
+    for relative_path, contents in files.items():
+        path = tmp_path / relative_path
+        path.parent.mkdir(parents=True, exist_ok=True)
+        path.write_text(contents)
+
+    matcher = build_matcher(tmp_path, ["**/*.cpp", "**/*.h"], [])
+    included = {
+        relative_path.as_posix()
+        for _, relative_path in iter_included_files(tmp_path, tmp_path, matcher)
+    }
+
+    assert included == {"Root.cpp", "Engine/Source/kept.cpp", "Engine/Source/kept.h"}