from pathlib import Path

_VERSION = None


def app_version(request):
    global _VERSION
    if _VERSION is None:
        version_file = Path(__file__).resolve().parent.parent.parent / "VERSION"
        try:
            _VERSION = version_file.read_text().strip()
        except FileNotFoundError:
            _VERSION = "unknown"
    return {"APP_VERSION": _VERSION}