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 cliff -- Command Line Interface Formulation Framework
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cliff is a framework for building command line programs. It uses
setuptools entry points to provide subcommands, output formatters, and
other extensions.

To do
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- Should commands have an explicit API for checking whether the user
  can invoke them?
- example show app
- change API for list app to expect a sequence of dictionaries?
- unicode output for python 2 (incompatible with csv?)
- json formatter(s)
- pprint formatter(s)
- pretty but non-table formatter(s)
- shell script formatter(s)? (properties as variable names)
- create a few example commands that use a sqlite database to show how
  to manage transactions
- switch setup/teardown functions in app to use some sort of context
  manager?