Limnoria/src/questions.py

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#!/usr/bin/env python
###
# Copyright (c) 2002, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
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"""Handles interactive questions; useful for wizards and whatnot."""
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import textwrap
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from getpass import getpass as getPass
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def expect(prompt, possibilities, recursed=False, doindent=True):
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"""Prompt the user with prompt, allow them to choose from possibilities.
If possibilities is empty, allow anything.
"""
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originalPrompt = prompt
if doindent:
indent = ' ' * ((len(originalPrompt)%68) + 2)
else:
indent = ''
if recursed:
print 'Sorry, that response was not an option.'
if possibilities:
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prompt = '%s [%s]' % (originalPrompt, '/'.join(possibilities))
if len(prompt) > 70:
prompt = '%s [%s]' % (originalPrompt, '/ '.join(possibilities))
prompt = textwrap.fill(prompt, subsequent_indent=indent)
else:
prompt = textwrap.fill(prompt)
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prompt = prompt.replace('/ ', '/')
prompt = prompt.strip() + ' '
s = raw_input(prompt)
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s = s.strip()
if possibilities:
if s in possibilities:
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return s
else:
return expect(originalPrompt, possibilities, recursed=True,
doindent=doindent)
else:
return s.strip()
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def expectWithDefault(prompt, possibilities, default):
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"""Same as expect, except with a default."""
indent = ' ' * ((len(prompt)%68) + 2)
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prompt = '%s [%s] (default: %s) ' % \
(prompt.strip(), '/'.join(possibilities), default)
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if len(prompt) > 70:
prompt = '%s [%s] (default: %s) ' % \
(prompt.strip(), ' / '.join(possibilities), default)
prompt = textwrap.fill(prompt, subsequent_indent=indent)
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s = raw_input(prompt)
s = s.strip()
if s in possibilities:
return s
else:
return default
def anything(prompt):
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"""Allow anything from the user."""
return expect(prompt, [])
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def something(prompt):
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"""Allow anything *except* nothing from the user."""
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s = expect(prompt, [])
while not s:
print 'Sorry, you must enter a value.'
s = expect(prompt, [])
return s
def yn(prompt):
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"""Allow only 'y' or 'n' from the user."""
return expect(prompt, ['y', 'n'], doindent=False)
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def getpass(prompt='Enter password: '):
password = ''
password2 = ' '
assert prompt
if not prompt[-1].isspace():
prompt += ' '
while True:
password = getPass(prompt)
password2 = getPass('Re-enter password: ')
if password != password2:
print 'Passwords don\'t match.'
else:
break
return password
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# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: