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kivy/tools/packaging/cython_cfg.py

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+import configparser
+from os.path import join, dirname
+import textwrap
+
+__all__ = ('get_cython_versions', 'get_cython_msg')
+
+
+def get_cython_versions(setup_cfg=''):
+    _cython_config = configparser.ConfigParser()
+    if setup_cfg:
+        _cython_config.read(setup_cfg)
+    else:
+        _cython_config.read(
+            join(dirname(__file__), '..', '..', '..', 'setup.cfg'))
+
+    cython_min = _cython_config['kivy']['cython_min']
+    cython_max = _cython_config['kivy']['cython_max']
+    cython_unsupported = _cython_config['kivy']['cython_exclude'].split(',')
+    # ref https://github.com/cython/cython/issues/1968
+
+    cython_requires = (
+        'cython>={min_version},<={max_version},{exclusion}'.format(
+            min_version=cython_min,
+            max_version=cython_max,
+            exclusion=','.join('!=%s' % excl for excl in cython_unsupported),
+        )
+    )
+
+    return cython_requires, cython_min, cython_max, cython_unsupported
+
+
+def get_cython_msg():
+    cython_requires, cython_min, cython_max, cython_unsupported = \
+        get_cython_versions()
+    cython_unsupported_append = '''
+
+    Please note that the following versions of Cython are not supported
+    at all: {}'''.format(', '.join(map(str, cython_unsupported)))
+
+    cython_min_msg = textwrap.dedent('''
+    This version of Cython is not compatible with Kivy. Please upgrade to
+    at least version {0}, preferably the newest supported version {1}.
+
+    If your platform provides a Cython package, make sure you have upgraded
+    to the newest version. If the newest version available is still too low,
+    please remove it and install the newest supported Cython via pip:
+
+        pip install -I "{3}"{2}
+    '''.format(cython_min, cython_max,
+               cython_unsupported_append if cython_unsupported else '',
+               cython_requires))
+
+    cython_max_msg = textwrap.dedent('''
+    This version of Cython is untested with Kivy. While this version may
+    work perfectly fine, it is possible that you may experience issues.
+    Please downgrade to a supported version, or update cython_max in
+    setup.cfg to your version of Cython. It is best to use the newest
+    supported version, {1}, but the minimum supported version is {0}.
+
+    If your platform provides a Cython package, check if you can downgrade
+    to a supported version. Otherwise, uninstall the platform package and
+    install Cython via pip:
+
+        pip install -I "{3}"{2}
+    '''.format(cython_min, cython_max,
+               cython_unsupported_append if cython_unsupported else '',
+               cython_requires))
+
+    cython_unsupported_msg = textwrap.dedent('''
+    This version of Cython suffers from known bugs and is unsupported.
+    Please install the newest supported version, {1}, if possible, but
+    the minimum supported version is {0}.
+
+    If your platform provides a Cython package, check if you can install
+    a supported version. Otherwise, uninstall the platform package and
+    install Cython via pip:
+
+        pip install -I "{3}"{2}
+    '''.format(cython_min, cython_max, cython_unsupported_append,
+               cython_requires))
+
+    return cython_min_msg, cython_max_msg, cython_unsupported_msg