makepth.py

"""
Make a Python .pth file so external Pythons can use QGIS's packages and extensions
"""

import os
from pathlib import Path
import sys

if sys.platform == "win32":
    import win32api


    def normalize_path(path: Path) -> Path:
        return Path(win32api.GetLongPathName(str(path)))
else:
    def normalize_path(path: Path) -> Path:
        return path


def get_qgis_python_paths() -> list[Path]:
    python_paths = map(normalize_path, filter(lambda path: path.exists(), map(Path, sys.path)))

    # QGIS_PREFIX_PATH refers to the apps/qgis-ltr directory, but we're actually interested in all Python paths under
    # the QGIS top-level installation directory.
    qgis_path = normalize_path(Path(os.environ["QGIS_PREFIX_PATH"]).parents[1])
    return [path for path in python_paths if path.is_relative_to(qgis_path)]


def get_pth_file_contents() -> str:
    return os.linesep.join(map(str, get_qgis_python_paths()))


print(get_pth_file_contents())