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annotate makeitso/cli.py @ 253:668b0e1f5ce0

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introduce failing test: the first step to passing
author Jeff Hammel <k0scist@gmail.com>
date Sat, 13 May 2017 18:36:01 -0700
parents aed8c4af5f26
children
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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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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 = getattr(self, 'usage', '%prog [options] output')
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19 description = self.template_class.get_description()
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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) and description is not None:
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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 get_variables(self, options):
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33 """
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34 return variables from (parsed) options
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35 """
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36 return dict([(key, value)
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37 for key, value in options.__dict__.items()
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38 if (not key.startswith('_')) and (value is not Undefined)])
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40 def parse(self, args=None, parser=None, options=None):
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41
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42 # parse the command line
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43 if not parser or not options:
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44 parser = self.parser()
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45 options, args = parser.parse_args(args=args)
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47 # ensure output is given
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48 if len(args) != 1:
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49 parser.error("Please specify a single output destination")
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50
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51 # template variables
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52 variables = self.get_variables(options)
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54 # return the variables and the output
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55 return variables, args[0]
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57 def __call__(self, *args):
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58 """interpolate template"""
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59 variables, output = self.parse(list(args))
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60 template = self.template_class(variables=variables)
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61 template.substitute({}, output=output)