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"""
This defines the ConfigureAction for argparse found here:
http://code.google.com/p/argparse/issues/detail?id=2#c6
We use it to set booelan arguments for command parameters
to False using a `--no-` prefix.
"""
import argparse
import re
TRUEISH = ['1', 't', 'true', 'yes', 'on']
FALSISH = ['0', 'f', 'false', 'no', 'off']
def boolean(string):
string = string.lower()
if string in FALSISH:
return False
elif string in TRUEISH:
return True
else:
raise ValueError()
class BooleanAction(argparse.Action):
def __init__(self, *args, **kwargs):
kwargs['type'] = boolean
kwargs['choices'] = TRUEISH + FALSISH
kwargs['metavar'] = 'BOOL'
argparse.Action.__init__(self, *args, **kwargs)
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