run_chainlit.py

#!/usr/bin/env python3
"""Load project `.env` then start Chainlit (reads CHAINLIT_PORT before binding).

Run from repo root:  python run_chainlit.py
Or with CLI flags:    python run_chainlit.py --port 8010

If you see "address already in use", set CHAINLIT_PORT in `.env` or pass `--port`.
"""

from __future__ import annotations

import os
import sys
from pathlib import Path


def main() -> None:
    # Python 3.14: engineio/socketio + asyncio.wait_for → "Timeout should be used inside a task"
    if sys.version_info >= (3, 14):
        sys.stderr.write(
            "travel-agent: Python 3.14+ is not supported yet (Chainlit / engineio / asyncio). "
            "Use Python 3.11, 3.12, or 3.13. See pyproject.toml requires-python.\n"
        )
        raise SystemExit(1)
    root = Path(__file__).resolve().parent
    env_file = root / ".env"
    if env_file.is_file():
        from dotenv import load_dotenv

        load_dotenv(env_file)
    # Chainlit does int(os.environ["CHAINLIT_PORT"]); empty string crashes ValueError.
    raw = os.environ.get("CHAINLIT_PORT")
    if raw is not None and not str(raw).strip():
        os.environ.pop("CHAINLIT_PORT", None)
    elif raw is not None:
        try:
            p = int(str(raw).strip())
            if 1 <= p <= 65535:
                os.environ["CHAINLIT_PORT"] = str(p)
            else:
                os.environ.pop("CHAINLIT_PORT", None)
        except ValueError:
            os.environ.pop("CHAINLIT_PORT", None)
    os.chdir(root)
    src = root / "src"
    if src.is_dir() and str(src) not in sys.path:
        sys.path.insert(0, str(src))
    from travel_agent.sniffio_patch import apply_chainlit_python314_compat

    apply_chainlit_python314_compat()
    app = root / "chainlit_app.py"
    sys.argv = ["chainlit", "run", str(app), *sys.argv[1:]]
    from chainlit.cli import cli

    cli()


if __name__ == "__main__":
    main()