Limnoria/src/questions.py

143 lines
4.6 KiB
Python

#!/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.
###
"""Handles interactive questions; useful for wizards and whatnot."""
__revision__ = "$Id$"
import sys
import textwrap
from getpass import getpass as getPass
import ansi
import utils
useBold = False
def output(s, unformatted=True):
if unformatted:
s = textwrap.fill(utils.normalizeWhitespace(s))
print s
print
# doindent is used in yn().
def expect(prompt, possibilities, recursed=False,
doindent=True, default=None, acceptEmpty=False):
"""Prompt the user with prompt, allow them to choose from possibilities.
If possibilities is empty, allow anything.
"""
prompt = utils.normalizeWhitespace(prompt)
originalPrompt = prompt
if doindent:
indent = ' ' * ((len(originalPrompt)%68) + 2)
else:
indent = ''
if recursed:
output('Sorry, that response was not an option.')
if possibilities:
prompt = '%s [%s]' % (originalPrompt, '/'.join(possibilities))
if len(prompt) > 70:
prompt = '%s [%s]' % (originalPrompt, '/ '.join(possibilities))
if default is not None:
prompt = '%s (default: %s)' % (prompt, default)
prompt = textwrap.fill(prompt, subsequent_indent=indent)
prompt = prompt.replace('/ ', '/')
prompt = prompt.strip() + ' '
if useBold:
sys.stdout.write(ansi.BOLD)
s = raw_input(prompt)
if useBold:
print ansi.RESET
s = s.strip()
if possibilities:
if s in possibilities:
return s
elif not s and default is not None:
return default
elif not s and acceptEmpty:
return s
else:
return expect(originalPrompt, possibilities, recursed=True,
doindent=doindent, default=default)
else:
if not s and default is not None:
return default
return s.strip()
def anything(prompt):
"""Allow anything from the user."""
return expect(prompt, [])
def something(prompt, default=None):
"""Allow anything *except* nothing from the user."""
s = expect(prompt, [], default=default)
while not s:
output('Sorry, you must enter a value.')
s = expect(prompt, [], default=default)
return s
def yn(prompt, default=None):
"""Allow only 'y' or 'n' from the user."""
if default is not None:
if default:
default = 'y'
else:
default = 'n'
s = expect(prompt, ['y', 'n'], doindent=False, default=default)
if s is 'y':
return True
else:
return False
def getpass(prompt='Enter password: '):
"""Prompt the user for a password."""
password = ''
password2 = ' '
assert prompt
if not prompt[-1].isspace():
prompt += ' '
while True:
if useBold:
sys.stdout.write(ansi.BOLD)
password = getPass(prompt)
password2 = getPass('Re-enter password: ')
if useBold:
print ansi.RESET
if password != password2:
output('Passwords don\'t match.')
else:
break
return password
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: