Merge pull request #276 from zopefoundation/dataflake/pyproject.toml

Add ``pyproject.toml`` to the list of managed files

config/README.rst

@@ -109,26 +109,27 @@ See ``--help`` for details.
 
 The script does the following steps:
 
-1. Add the package name to ``packages.txt`` of the selected configuration type
+#. Add the package name to ``packages.txt`` of the selected configuration type
    if it is not yet added.
-2. Copy ``setup.cfg``, ``tox.ini``, ``tests.yml``, ``MANIFEST.in``,
+#. Copy ``setup.cfg``, ``tox.ini``, ``tests.yml``, ``MANIFEST.in``,
    ``.readthedocs.yaml`` (if needed), and ``.gitignore`` to the repository.
-3. Remove a possibly existing ``.coveragerc`` and ``bootstrap.py``. (Coverage
+#. Create or update a ``pyproject.toml`` project configuration file.
+#. Remove a possibly existing ``.coveragerc`` and ``bootstrap.py``. (Coverage
    is now configured in ``tox.ini`` for packages which are no buildout
    recipes.)
-4. Run the tests via: ``tox``. The ``tox`` script may be either on the current
+#. Run the tests via: ``tox``. The ``tox`` script may be either on the current
    ``$PATH`` or in the ``bin`` subfolder of the current working directory.
-5. Create a branch and a pull request. (Prevent an automatic commit of all
+#. Create a branch and a pull request. (Prevent an automatic commit of all
    changes with the command line switch ``--no-commit``, or an automatic push
    to GitHub using the command line switch ``--no-push``.)
 
 After running the script you should manually do the following steps:
 
-1. Check for changes in the updated repository and for the need of a change log
+#. Check for changes in the updated repository and for the need of a change log
    entry over there.
-2. Make sure the package is activated on https://coveralls.io by trying to add
+#. Make sure the package is activated on https://coveralls.io by trying to add
    the repository name and making it active.
-3. Check in possible changes in the zopefoundation/meta repository.
+#. Check in possible changes in the zopefoundation/meta repository.
 
 
 CLI arguments
@@ -693,12 +694,12 @@ See ``--help`` for details.
 
 The script does the following steps:
 
-1. It does the following steps for each line in the given ``packages.txt``
+#. It does the following steps for each line in the given ``packages.txt``
    which does not start with ``#``.
-2. Check if there is a repository in ``<path-to-clones>`` with the name of the
+#. Check if there is a repository in ``<path-to-clones>`` with the name of the
    repository. If it does not exist: clone it. If it exists: clean the clone
    from changes, switch to ``master`` branch and pull from origin.
-3. Call the given script with the package name and arguments for the script.
+#. Call the given script with the package name and arguments for the script.
 
 .. caution::
 

config/config-package.py

@@ -550,6 +550,39 @@ def manifest_in(self):
                 manifest_additional_rules=manifest_additional_rules,
                 with_docs=self.with_docs)
 
+    def pyproject_toml(self):
+        """Modify pyproject.toml with meta options."""
+        pyproject_toml_path = self.path / 'pyproject.toml'
+        if pyproject_toml_path.exists():
+            with open(pyproject_toml_path, 'rb') as fp:
+                pyproject_data = tomlkit.load(fp)
+            pyproject_toml = collections.defaultdict(dict, **pyproject_data)
+        else:
+            pyproject_toml = collections.defaultdict(dict)
+
+        buildsystem_cfg = pyproject_toml['build-system']
+
+        # Insert sane default for build-system:requires
+        requires = buildsystem_cfg.get('requires', [])
+        setuptools_requirement = [
+            x for x in requires if x.startswith('setuptools')]
+        for setuptools_req in setuptools_requirement:
+            requires.remove(setuptools_req)
+        requires.append(f'setuptools{SETUPTOOLS_VERSION_SPEC}')
+        buildsystem_cfg['requires'] = sorted(requires)
+
+        # Insert sane default for build-system:build-backend
+        build_backend = buildsystem_cfg.get('build-backend', '')
+        if not build_backend:
+            buildsystem_cfg['build-backend'] = 'setuptools.build_meta'
+
+        # Remove empty sections before writing to disk
+        pyproject_toml = {k: v for k, v in pyproject_toml.items() if v}
+        with open(pyproject_toml_path, 'w') as fp:
+            fp.write(META_HINT.format(config_type=self.config_type))
+            fp.write('\n')
+            tomlkit.dump(pyproject_toml, fp, sort_keys=True)
+
     def copy_with_meta(
             self, template_name, destination, config_type,
             meta_hint=META_HINT, **kw):
@@ -580,6 +613,7 @@ def configure(self):
         if self.with_docs:
             self.readthedocs()
 
+        self.pyproject_toml()
         self.setup_cfg()
         self.gitignore()
         self.pre_commit_config_yaml()
@@ -595,6 +629,7 @@ def configure(self):
             early_add = [
                 '.pre-commit-config.yaml',
                 'CONTRIBUTING.md',
+                'pyproject.toml',
             ]
             if self.args.commit:
                 call('git', 'add', *early_add)