/usr/lib/python2.7/dist-packages/argh/interaction.py is in python-argh 0.25.0-1.
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#
# Copyright © 2010—2014 Andrey Mikhaylenko and contributors
#
# This file is part of Argh.
#
# Argh is free software under terms of the GNU Lesser
# General Public License version 3 (LGPLv3) as published by the Free
# Software Foundation. See the file README.rst for copying conditions.
#
"""
Interaction
~~~~~~~~~~~
"""
from argh.compat import text_type
from argh.io import safe_input
__all__ = ['confirm', 'safe_input']
def confirm(action, default=None, skip=False):
"""
A shortcut for typical confirmation prompt.
:param action:
a string describing the action, e.g. "Apply changes". A question mark
will be appended.
:param default:
`bool` or `None`. Determines what happens when user hits :kbd:`Enter`
without typing in a choice. If `True`, default choice is "yes". If
`False`, it is "no". If `None` the prompt keeps reappearing until user
types in a choice (not necessarily acceptable) or until the number of
iteration reaches the limit. Default is `None`.
:param skip:
`bool`; if `True`, no interactive prompt is used and default choice is
returned (useful for batch mode). Default is `False`.
Usage::
def delete(key, silent=False):
item = db.get(Item, args.key)
if confirm('Delete '+item.title, default=True, skip=silent):
item.delete()
print('Item deleted.')
else:
print('Operation cancelled.')
Returns `None` on `KeyboardInterrupt` event.
"""
MAX_ITERATIONS = 3
if skip:
return default
else:
defaults = {
None: ('y','n'),
True: ('Y','n'),
False: ('y','N'),
}
y, n = defaults[default]
prompt = text_type('{action}? ({y}/{n})').format(**locals())
choice = None
try:
if default is None:
cnt = 1
while not choice and cnt < MAX_ITERATIONS:
choice = safe_input(prompt)
cnt += 1
else:
choice = safe_input(prompt)
except KeyboardInterrupt:
return None
if choice in ('yes', 'y', 'Y'):
return True
if choice in ('no', 'n', 'N'):
return False
if default is not None:
return default
return None
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