def create_cmdclass(prerelease_cmd=None, package_data_spec=None,
data_files_spec=None):
"""Create a command class with the given optional prerelease class.
Parameters
----------
prerelease_cmd: (name, Command) tuple, optional
The command to run before releasing.
package_data_spec: dict, optional
A dictionary whose keys are the dotted package names and
whose values are a list of glob patterns.
data_files_spec: list, optional
A list of (path, dname, pattern) tuples where the path is the
`data_files` install path, dname is the source directory, and the
pattern is a glob pattern.
Notes
-----
We use specs so that we can find the files *after* the build
command has run.
The package data glob patterns should be relative paths from the package
folder containing the __init__.py file, which is given as the package
name.
e.g. `dict(foo=['./bar/*', './baz/**'])`
The data files directories should be absolute paths or relative paths
from the root directory of the repository. Data files are specified
differently from `package_data` because we need a separate path entry
for each nested folder in `data_files`, and this makes it easier to
parse.
e.g. `('share/foo/bar', 'pkgname/bizz, '*')`
"""
wrapped = [prerelease_cmd] if prerelease_cmd else []
if package_data_spec or data_files_spec:
wrapped.append('handle_files')
wrapper = functools.partial(_wrap_command, wrapped)
handle_files = _get_file_handler(package_data_spec, data_files_spec)
if 'bdist_egg' in sys.argv:
egg = wrapper(bdist_egg, strict=True)
else:
egg = bdist_egg_disabled
cmdclass = dict(
build_py=wrapper(build_py, strict=is_repo),
bdist_egg=egg,
sdist=wrapper(sdist, strict=True),
handle_files=handle_files,
)
if bdist_wheel:
cmdclass['bdist_wheel'] = wrapper(bdist_wheel, strict=True)
cmdclass['develop'] = wrapper(develop, strict=True)
return cmdclass
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