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"""Usage: prog.py [--count=N] PATH FILE...
Arguments:
FILE input file
PATH out directory
Options:
--count=N number of operations
"""
import os
from docopt import docopt
try:
from schema import Schema, And, Or, Use, SchemaError
except ImportError:
exit('This example requires that `schema` data-validation library'
' is installed: \n pip install schema\n'
'https://github.com/halst/schema')
if __name__ == '__main__':
args = docopt(__doc__)
schema = Schema({
'FILE': [Use(open, error='FILE should be readable')],
'PATH': And(os.path.exists, error='PATH should exist'),
'--count': Or(None, And(Use(int), lambda n: 0 < n < 5),
error='--count=N should be integer 0 < N < 5')})
try:
args = schema.validate(args)
except SchemaError as e:
exit(e)
print(args)
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