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annotate makeitso/cli.py @ 62:30100690ad3f

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display defaults with command line --help option
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 06 Jan 2011 17:49:40 -0800
parents 57f9b0349192
children cce0da329f59
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1 """
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2 command line parser for MakeItSo
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3 """
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4
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5 from template import Undefined
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6 from optparse import OptionParser
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7
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8 class MakeItSoCLI(object):
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9 """command line interface to a makeitso template"""
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10
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11 def __init__(self, template_class):
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12 self.template_class = template_class
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13
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14 def parser(self):
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15 """
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16 return a command line parser for the template
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17 """
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18 usage = '%prog [options] output [var1=value1] [var2=value2] [...]'
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19 description = getattr(self.template_class, 'description', None)
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20 parser = OptionParser(usage=usage, description=description)
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21
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22 # add the variables as options
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23 for variable in self.template_class.vars:
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24 description = variable.description
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25 if (variable.default is not None) and (variable.default is not Undefined):
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26 description += ' [DEFAULT: %s]' % variable.default
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27 parser.add_option('--%s' % variable.name, dest=variable.name,
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28 default=variable.default,
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29 help=description)
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30 return parser
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32 def parse(self):
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33 parser = self.parser()
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34 options, args = parser.parse_args()
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35
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36 # ensure output is given
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37 if len(args) != 1:
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38 parser.error("Please specify a single output destination")
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40 # template variables
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41 variables = dict([(key, value)
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42 for key, value in options.__dict__.items()
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43 if not key.startswith('_')])
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45 # instantiate the template
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46 template = self.template_class(output=args[0], variables=variables)
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47
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48 return template