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⚡ Bolt: Optimize path containment check #104

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⚡ Bolt: Optimize path containment check #104

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3 changes: 3 additions & 0 deletions .jules/bolt.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
## 2024-05-24 - os.path.commonpath Bottleneck
**Learning:** `os.path.commonpath` is a significant performance bottleneck for path containment checks due to internal list allocations and path splitting.
**Action:** Use `os.path.abspath` combined with `str.startswith()` and a conditional trailing `os.sep` to safely and efficiently check path containment without traversal bugs.
3 changes: 2 additions & 1 deletion helpers/files.py
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Expand Up @@ -653,7 +653,8 @@ def is_in_dir(path: str, dir: str):
# check if the given path is within the directory
abs_path = os.path.abspath(path)
abs_dir = os.path.abspath(dir)
return os.path.commonpath([abs_path, abs_dir]) == abs_dir
# ⚡ Bolt: Avoid os.path.commonpath overhead for significant speedup
return abs_path == abs_dir or abs_path.startswith(abs_dir + ('' if abs_dir.endswith(os.sep) else os.sep))


def get_subdirectories(
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