fix(scripts): preserve paths when formatting C++ sources

scripts/format_csrc.sh

@@ -68,6 +68,8 @@ if [ "${1:-}" = "--check" ]; then
     fi
 else
     echo "Formatting $FILE_COUNT files in csrc/..."
-    echo "$FILES" | xargs "$CLANG_FORMAT_BIN" -i
+    while IFS= read -r file; do
+        "$CLANG_FORMAT_BIN" -i "$file"
+    done <<< "$FILES"
     echo "Done."
 fi

tests/scripts/test_format_csrc.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+
+@pytest.mark.ci
+@pytest.mark.ci_npu
+def test_format_csrc_with_spaces(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    formatter = shutil.which("clang-format")
+    if formatter is None:
+        pytest.skip("clang-format is required (see requirements-dev.txt)")
+    monkeypatch.setenv("CLANG_FORMAT", formatter)
+
+    repo = Path(__file__).resolve().parents[2]
+    checkout = tmp_path / "checkout with spaces"
+    (checkout / "scripts").mkdir(parents=True)
+    (checkout / "csrc").mkdir()
+    script = checkout / "scripts/format_csrc.sh"
+    shutil.copyfile(repo / "scripts/format_csrc.sh", script)
+    shutil.copyfile(repo / ".clang-format", checkout / ".clang-format")
+    source = checkout / "csrc/source with spaces.cpp"
+    source.write_text("int  value=1;\n")
+
+    for args in ([], ["--check"]):
+        subprocess.run(
+            ["bash", str(script), *args],
+            check=True,
+            capture_output=True,
+            text=True,
+            timeout=15,
+        )
+    assert source.read_text() == "int value = 1;\n"