43 lines
1.7 KiB
Python
43 lines
1.7 KiB
Python
# Copyright (c) 2012-2013, Eucalyptus Systems, Inc.
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#
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# Permission to use, copy, modify, and/or distribute this software for
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# any purpose with or without fee is hereby granted, provided that the
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# above copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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from . import Arg
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from .command import BaseCommand
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class TabifyingCommand(BaseCommand):
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'''
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A request mixin that provides the tabify() function along with its
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associated --show-empty-fields command line arg.
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'''
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ARGS = [Arg('--show-empty-fields', action='store_true', route_to=None,
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help='show empty values as "(nil)"')]
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def tabify(self, fields, include=None):
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'''
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Join a list of strings with tabs. Nonzero items that Python considers
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false are printed as-is if they appear in the include list, replaced
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with '(nil)' if the user specifies --show-empty-fields at the command
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line, and omitted otherwise.
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'''
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def allowable(item):
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return bool(item) or item is 0 or item in (include or [])
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if self.args['show_empty_fields']:
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fstr = '(nil)'
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else:
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fstr = ''
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return '\t'.join([str(f) if allowable(f) else fstr for f in fields])
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