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98 lines
3.6 KiB
Python
98 lines
3.6 KiB
Python
#!/usr/bin/env python
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###
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# Copyright (c) 2002, Jeremiah Fincher
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions, and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions, and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the author of this software nor the name of
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# contributors to this software may be used to endorse or promote products
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# derived from this software without specific prior written consent.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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###
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"""Handles interactive questions; useful for wizards and whatnot."""
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import textwrap
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def expect(prompt, possibilities, recursed=False):
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"""Prompt the user with prompt, allow them to choose from possibilities.
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If possibilities is empty, allow anything.
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"""
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originalPrompt = prompt
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indent = ' ' * ((len(originalPrompt)%68) + 2)
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if recursed:
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print 'Sorry, that response was not an option.'
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if possibilities:
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prompt = '%s [%s]' % (originalPrompt, '/'.join(possibilities))
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if len(prompt) > 70:
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prompt = '%s [%s]' % (originalPrompt, '/ '.join(possibilities))
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prompt = textwrap.fill(prompt, subsequent_indent=indent)
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else:
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prompt = textwrap.fill(prompt)
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prompt = prompt.replace('/ ', '/')
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prompt = prompt.strip() + ' '
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s = raw_input(prompt)
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s = s.strip()
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if possibilities:
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if s in possibilities:
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return s
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else:
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return expect(originalPrompt, possibilities, recursed=True)
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else:
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return s.strip()
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def expectWithDefault(prompt, possibilities, default):
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"""Same as expect, except with a default."""
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indent = ' ' * ((len(prompt)%68) + 2)
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prompt = '%s [%s] (default: %s) ' % \
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(prompt.strip(), '/'.join(possibilities), default)
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if len(prompt) > 70:
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prompt = '%s [%s] (default: %s) ' % \
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(prompt.strip(), ' / '.join(possibilities), default)
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prompt = textwrap.fill(prompt, subsequent_indent=indent)
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s = raw_input(prompt)
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s = s.strip()
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if s in possibilities:
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return s
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else:
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return default
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def anything(prompt):
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"""Allow anything from the user."""
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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, [])
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while not s:
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print 'Sorry, you must enter a value.'
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s = expect(prompt, [])
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return s
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def yn(prompt):
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"""Allow only 'y' or 'n' from the user."""
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return expect(prompt, ['y', 'n'])
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# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78:
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