Dispatch from command-line arguments to functions

Experimental.

Example

.. code:: python

"""Run something in development or production mode.

Usage: run.py --development <host> <port>
       run.py --production <host> <port>
       run.py items add <item>
       run.py items delete <item>

"""
from docopt_dispatch import dispatch

@dispatch.on('--development')
def development(host, port, **kwargs):
    print('in *development* mode')

@dispatch.on('--production')
def development(host, port, **kwargs):
    print('in *production* mode')

@dispatch.on('items', 'add')
def items_add(item, **kwargs):
    print('adding item...')

@dispatch.on('items', 'delete')
def items_delete(item, **kwargs):
    print('deleting item...')

if __name__ == '__main__':
    dispatch(__doc__)