import importlib
import os
import pathlib
import py_compile
import shutil
import sys
import tempfile
import textwrap


def compile(tempdir):
    target_dir = pathlib.Path(tempdir) / 'cimportlib'
    souce_dir = pathlib.Path(importlib.__file__).parent
    shutil.copytree(souce_dir, target_dir, ignore=lambda *_: ['__pycache__'])

    for dirpath, _, filenames in os.walk(target_dir):
        for filename in filenames:
            if filename != "_common.py":
                continue
            source_path = pathlib.Path(dirpath) / filename
            cfile = source_path.with_suffix('.pyc')
            py_compile.compile(source_path, cfile)
            pathlib.Path.unlink(source_path)


def create_package(tempdir):
    package_dir = pathlib.Path(tempdir) / 'somepkg'
    package_dir.mkdir()
    contents = {
        "__init__.py": textwrap.dedent(
            """
            import cimportlib.resources as res
            val = res.files().joinpath('resource.txt').read_text(encoding='utf-8')
            """
        ),
        "resource.txt": "data",
    }

    for file, content in contents.items():
        path = pathlib.Path(package_dir) / file
        path.write_text(content)


def main():
    with tempfile.TemporaryDirectory() as tempdir:
        compile(tempdir)
        create_package(tempdir)
        sys.path.insert(0, str(tempdir))
        print(importlib.import_module('somepkg').val)


if __name__ == "__main__":
    raise SystemExit(main())