| """Simple .env loader without external dependencies. | |
| Reads a `.env` file from the project root and sets process environment | |
| variables. Lines beginning with `#` are treated as comments; blank lines are | |
| ignored. Only KEY=VALUE pairs are supported. | |
| """ | |
| from __future__ import annotations | |
| import os | |
| from pathlib import Path | |
| from typing import Dict | |
| def load_env(filename: str = ".env") -> Dict[str, str]: | |
| """Load environment variables from a .env-style file. | |
| Returns a mapping of keys loaded. Existing environment variables are not | |
| overwritten. | |
| """ | |
| loaded: Dict[str, str] = {} | |
| root = Path.cwd() | |
| path = root / filename | |
| if not path.exists(): | |
| return loaded | |
| try: | |
| for line in path.read_text(encoding="utf-8").splitlines(): | |
| line = line.strip() | |
| if not line or line.startswith("#"): | |
| continue | |
| if "=" not in line: | |
| continue | |
| key, value = line.split("=", 1) | |
| key = key.strip() | |
| value = value.strip() | |
| if key and (key not in os.environ): | |
| os.environ[key] = value | |
| loaded[key] = value | |
| except (IOError, UnicodeDecodeError, PermissionError): | |
| # Fail silently to avoid breaking runtime when .env is malformed. | |
| return loaded | |
| return loaded | |