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| � r| ^ q� GHt j d � d S( s? Entry Point for completion of main and subcommand options.
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:param cwords: same as the environmental variable ``COMP_WORDS``
:param cword: same as the environmental variable ``COMP_CWORD``
:param opts: The available options to check
:return: path completion type (``file``, ``dir``, ``path`` or None)
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:return: A generator of regular files and/or directories
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