import os
import re

import pytest


def get_passed_tests():
    """
    Get the list of passed tests by inspecting the log generated by pytest.

    This is useful on CIs to restart the test suite from the point where a
    segfault was thrown by it.
    """
    # This assumes the pytest log is placed next to this file. That's where
    # we put it on CIs.
    tests = set()
    if os.path.isfile('pytest_log.txt'):
        # Detect all tests that passed before.
        test_re = re.compile(r'(test.*) [^ ]*(SKIPPED|PASSED|XFAIL)')
        with open('pytest_log.txt') as logfile:
            for line in logfile:
                if match := test_re.match(line):
                    tests.add(match.group(1))

    return tests


def pytest_collection_modifyitems(config, items):
    """
    Skip tests that passed on a previous run.
    """
    passed_tests = get_passed_tests()
    skip_passed = pytest.mark.skip(reason="Test passed in previous runs")

    for item in items:
        if item.nodeid in passed_tests:
            item.add_marker(skip_passed)