scripts/audit_naive_fromtimestamp.py

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"""Detect datetime.fromtimestamp() calls without an explicit timezone."""
from __future__ import annotations
import argparse, ast
from pathlib import Path
from scripts.audit_common import print_failures, production_python_files, require_root

def audit_source(source: str) -> list[str]:
    try: tree=ast.parse(source)
    except SyntaxError: return []
    out=[]
    for n in ast.walk(tree):
        if isinstance(n, ast.Call) and isinstance(n.func, ast.Attribute) and n.func.attr=="fromtimestamp" and isinstance(n.func.value, ast.Name) and n.func.value.id=="datetime":
            if len(n.args)<2 and not any(k.arg in {"tz", "timezone"} for k in n.keywords): out.append(f"datetime.fromtimestamp() without timezone on line {n.lineno}")
    return out

def audit(root: Path)->list[str]:
    root=require_root(root); out=[]
    for rel in production_python_files(root):
        try: src=(root/rel).read_text(encoding="utf-8")
        except (OSError,UnicodeDecodeError): continue
        out.extend(f"{rel}: {x}" for x in audit_source(src))
    return out

def main(argv=None):
    p=argparse.ArgumentParser(description=__doc__); p.add_argument("root",nargs="?",default="."); return print_failures(audit(Path(p.parse_args(argv).root)))
if __name__=="__main__": raise SystemExit(main())