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annotate makeitso/template.py @ 60:da0d8c5c5157

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what i really meant to do with variables
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 06 Jan 2011 17:12:36 -0800
parents 112bf081148c
children 30100690ad3f
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1 """
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2 basic API template class
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3 """
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4
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5 import os
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6 import sys
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7 from makeitso import ContentTemplate
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8 from makeitso import PolyTemplate
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9
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10 class Undefined(object):
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11 """marker class for variables"""
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12 Undefined = Undefined() # singleton
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14 class Variable(object):
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15 """variable object for MakeItSo templates"""
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17 def __init__(self, name, description=None, default=Undefined,
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18 cast=None):
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19 self.name = name
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20 self.default = default
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21 self.description = description
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23 # TODO (maybe): get cast from default variable type if not None
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24 self.cast = cast
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26 self._set = False
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28 def set(self, value):
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29 if self.cast:
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30 self.value = self.cast(value)
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31 else:
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32 self.value = value
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33 self._set = True
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35 def read(self, fd=sys.stdout):
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36 """prompt and read the variable from stdin"""
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37 fd.write(self.display())
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38 self.set(raw_input())
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40 def display(self):
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41 description = self.description or self.name
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42 if self.default:
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43 return 'Enter %s [DEFAULT: %s]:' % (description, repr(self.default))
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44 else:
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45 return 'Enter %s:' % description
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46
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47 class MakeItSoTemplate(ContentTemplate):
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48 """API template for MakeItSo"""
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49
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50 # name of the template
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51 name = ''
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52
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53 # description of the template
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54 description = ''
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55
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56 # templates to interpolate
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57 # paths are relative to __file__ unless absolute or URIs
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58 templates = []
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59
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60 # variables
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61 vars = []
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62
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63 # inspect the templates for more variables
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64 look = False
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65
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66 def __init__(self, output=None, interactive=True, usedefaults=True,
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67 variables=None):
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68 """
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69 - output : output file or directory
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70 - interactive : whether tointeractively get variables
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71 - usedefaults : try to use the default values if not specified
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72 """
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73
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74 assert self.templates
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75 self.output = output
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76 self.interactive = interactive
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77 self.location = os.path.dirname(os.path.abspath(__file__))
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78 self.defaults = variables.copy()
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79
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80 # make a dictionary of the variables for lookup convenience
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81 self.vardict = {}
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82 for i in self.vars:
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83 self.vardict[i.name] = i
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84
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85 # ensure all of these templates exist
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86 for template in self.templates:
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87 if template.startswith('http://') or template.startswith('https://'):
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88 continue
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89 if os.path.isabs(template):
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90 path = template
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91 else:
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92 path = os.path.join(self.location, template)
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93 assert os.path.exists(template)
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94
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95 def missing(self, **variables):
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96 if self.look:
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97 pass
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98 else:
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99 if self.usedefaults:
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100 pass
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101
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102 def pre(self, **variables):
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103 """do stuff before interpolation"""
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104
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105 def substitute(self, **variables):
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106 """do the substitution"""
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107 vars = self.get_variables(**variables)
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108 self.pre(**variables)
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109 self.check_missing(vars)
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110 self.post(**variables)
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111
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112 def post(self, **variables):
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113 """do stuff after interpolation"""
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114
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115 def read_variables(self, variables):
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116 """read variables from stdin"""
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117 retval = {}
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118 for i in variables:
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119 if i in self.vardict:
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120 self.vardict[i].read()
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121 else:
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122 retval.update(ContentTemplate.read_variables(self, (i,)))
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123 return retval
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124
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125 class PasteScriptTemplate(MakeItSoTemplate):
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126 """template for backwards compatability with PasteScript"""