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This ads black, isort, pyupgrade, and flake8 to pre-commit-config.yaml
There are also some small changes to travis.yml and tasks.py to reduce
some repeated configurations that should be consolidated into
setup.cfg. Most other changes are automated by the linter scripts.
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reference to nox instead.
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Added additional documentation
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Cleaned up docstring in external test plugin
Updated some initialization to match new approach for version info discovery.
Tagged some IDE-only lines as no-cover
Adds plugin coverage reporting.
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Importing pkg_resources has a side-effect of scanning every installed
distribution on sys.path to load the metadata, especially the entry
points defined in the packages. This can have a significant
launch-time cost for command line applications when there are a lot of
distributions to scan.
Since cmd2 is only using pkg_resources to find the version of the
installed package, pkg_resources can be replaced with
importlib.metadata. The implementation in the new library is
significantly faster because it goes immediately to the metadata file
for the requested distribution, instead of scanning all of them. There
are also no import-time side-effects.
importlib.metadata is a new standard library module starting with
python 3.8. For earlier versions, a compatible library has been
released to PyPI as 'importlib_metadata'. This change adds the new
dependency with a qualifier so that it is only applied to older
versions of python, and then updates the places that were importing
pkg_resources to look for the different versions of the new library
instead. The documentation configuration is changed to import cmd2
itself to get its version, since the package has to be installed for
the metadata to be available anyway.
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
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