Pyproject support

setup.cfg

@@ -2,7 +2,7 @@
 universal = 1
 
 [metadata]
-license_file = LICENSE
+license_files = LICENSE
 
 [zest.releaser]
 python-file-with-version = src/check_python_versions/__init__.py
@@ -13,7 +13,7 @@ include_trailing_comma = true
 lines_after_imports = 2
 reverse_relative = true
 known_first_party = check_python_versions
-known_third_party = pytest, yaml
+known_third_party = pytest, yaml, tomlkit
 skip = check-python-versions
 
 [mypy]

setup.py

@@ -68,6 +68,6 @@
             'check-python-versions = check_python_versions.cli:main',
         ],
     },
-    install_requires=['pyyaml'],
+    install_requires=['pyyaml', 'tomlkit'],
     zip_safe=False,
 )

src/check_python_versions/cli.py

@@ -104,9 +104,9 @@ def is_package(where: str = '.') -> bool:
 
     Does not emit any diagnostics.
     """
-    # TODO: support setup.py-less packages that use pyproject.toml instead
     setup_py = os.path.join(where, 'setup.py')
-    return os.path.exists(setup_py)
+    pyproject_toml = os.path.join(where, 'pyproject.toml')
+    return os.path.exists(setup_py) or os.path.exists(pyproject_toml)
 
 
 PrintFn = Callable[..., None]
@@ -126,7 +126,7 @@ def check_package(where: str = '.', *, print: PrintFn = print) -> bool:
         return False
 
     if not is_package(where):
-        print("no setup.py -- not a Python package?")
+        print("no setup.py or pyproject.toml -- not a Python package?")
         return False
 
     return True

src/check_python_versions/sources/all.py

@@ -1,6 +1,7 @@
 from .appveyor import Appveyor
 from .github import GitHubActions
 from .manylinux import Manylinux
+from .pyproject import PyProject, PyProjectPythonRequires
 from .setup_py import SetupClassifiers, SetupPythonRequires
 from .tox import Tox
 from .travis import Travis
@@ -12,6 +13,8 @@
 ALL_SOURCES = [
     SetupClassifiers,
     SetupPythonRequires,
+    PyProject,
+    PyProjectPythonRequires,
     Tox,
     Travis,
     GitHubActions,