feat: requires-python (#536)

* feat: requires-python

refactor: updating to current proposal

fix: add tests and fix a few issues

docs: Update mostly from @joerick

docs: update README from readthedocs

* refactor: pull out config file reading

* fix: always assume highest Python patch version

* refactor: try new design

* refactor: function and bump MyPy to 0.800

* fix: tighten AST to call only, add docs

* fix: address review points from @joerick

unit_test/main_tests/main_options_test.py

@@ -51,8 +51,8 @@ def test_build_selector(platform, intercepted_build_args, monkeypatch, allow_emp
 
     intercepted_build_selector = intercepted_build_args.args[0].build_selector
     assert isinstance(intercepted_build_selector, BuildSelector)
-    assert intercepted_build_selector('build-this')
-    assert not intercepted_build_selector('skip-that')
+    assert intercepted_build_selector('build24-this')
+    assert not intercepted_build_selector('skip65-that')
     # This unit test is just testing the options of 'main'
     # Unit tests for BuildSelector are in build_selector_test.py
 

unit_test/main_tests/main_platform_test.py

@@ -1,10 +1,11 @@
 import sys
 
 import pytest
-from conftest import MOCK_PACKAGE_DIR  # noqa: I100
 
 from cibuildwheel.__main__ import main
-from cibuildwheel.util import Architecture
+from cibuildwheel.architecture import Architecture
+
+from .conftest import MOCK_PACKAGE_DIR
 
 
 def test_unknown_platform_non_ci(monkeypatch, capsys):

unit_test/main_tests/main_requires_python_test.py

@@ -0,0 +1,103 @@
+import sys
+import textwrap
+
+import pytest
+from packaging.specifiers import SpecifierSet
+
+from cibuildwheel.__main__ import main
+
+
+@pytest.fixture(autouse=True, scope="function")
+def fake_package_dir(monkeypatch, tmp_path):
+    '''
+    Set up a fake project
+    '''
+
+    local_path = tmp_path / "tmp_project"
+    local_path.mkdir()
+
+    local_path.joinpath("setup.py").touch()
+
+    monkeypatch.setattr(sys, 'argv', ['cibuildwheel', str(local_path)])
+
+    return local_path
+
+
+def test_no_override(platform, monkeypatch, intercepted_build_args):
+
+    main()
+
+    intercepted_build_selector = intercepted_build_args.args[0].build_selector
+
+    assert intercepted_build_selector('cp39-win32')
+    assert intercepted_build_selector('cp36-win32')
+
+    assert intercepted_build_selector.requires_python is None
+
+
+def test_override_env(platform, monkeypatch, intercepted_build_args):
+    monkeypatch.setenv('CIBW_PROJECT_REQUIRES_PYTHON', '>=3.8')
+
+    main()
+
+    intercepted_build_selector = intercepted_build_args.args[0].build_selector
+
+    assert intercepted_build_selector.requires_python == SpecifierSet(">=3.8")
+
+    assert intercepted_build_selector('cp39-win32')
+    assert not intercepted_build_selector('cp36-win32')
+
+
+def test_override_setup_cfg(platform, monkeypatch, intercepted_build_args, fake_package_dir):
+
+    fake_package_dir.joinpath("setup.cfg").write_text(textwrap.dedent("""
+        [options]
+        python_requires = >=3.8
+    """))
+
+    main()
+
+    intercepted_build_selector = intercepted_build_args.args[0].build_selector
+
+    assert intercepted_build_selector.requires_python == SpecifierSet(">=3.8")
+
+    assert intercepted_build_selector('cp39-win32')
+    assert not intercepted_build_selector('cp36-win32')
+
+
+def test_override_pyproject_toml(platform, monkeypatch, intercepted_build_args, fake_package_dir):
+
+    fake_package_dir.joinpath("pyproject.toml").write_text(textwrap.dedent("""
+        [project]
+        requires-python = ">=3.8"
+    """))
+
+    main()
+
+    intercepted_build_selector = intercepted_build_args.args[0].build_selector
+
+    assert intercepted_build_selector.requires_python == SpecifierSet(">=3.8")
+
+    assert intercepted_build_selector('cp39-win32')
+    assert not intercepted_build_selector('cp36-win32')
+
+
+def test_override_setup_py_simple(platform, monkeypatch, intercepted_build_args, fake_package_dir):
+
+    fake_package_dir.joinpath("setup.py").write_text(textwrap.dedent("""
+        from setuptools import setup
+
+        setup(
+            name = "other",
+            python_requires = ">=3.7",
+        )
+    """))
+
+    main()
+
+    intercepted_build_selector = intercepted_build_args.args[0].build_selector
+
+    assert intercepted_build_selector.requires_python == SpecifierSet(">=3.7")
+
+    assert intercepted_build_selector('cp39-win32')
+    assert not intercepted_build_selector('cp36-win32')