Mercurial > hg > MakeItSo

annotate makeitso/template.py @ 109:697568ba4a22

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make the python package template a little fancier
author Jeff Hammel <jhammel@mozilla.com>
date Fri, 14 Jan 2011 17:55:08 -0800
parents 80a57bf2b7f4
children 51c9cb49edec
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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 def __nonzero__(self):
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13 return False
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14 Undefined = Undefined() # singleton
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16 class Variable(object):
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17 """variable object for MakeItSo templates"""
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19 def __init__(self, name, description=None, default=Undefined,
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20 cast=None):
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21 self.name = name
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22 self.default = default
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23 self.description = description
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25 # TODO (maybe): get cast from default variable type if not None
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26 self.cast = cast
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28 self._set = False
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29
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30 def copy(self):
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31 """returns a copy of the variable"""
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32 return Variable(self.name, self.description, self.default, self.cast)
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33
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34 def set(self, value):
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35 if self.cast:
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36 self.value = self.cast(value)
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37 else:
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38 self.value = value
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39 self._set = True
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40 return self.value
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41
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42 def isset(self):
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43 """whether the variable has been set or not"""
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44 return self._set
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46 def read(self, fd=sys.stdout):
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47 """prompt and read the variable from stdin"""
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48 fd.write(self.display())
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49 return self.set(raw_input())
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51 def display(self):
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52 description = self.description or self.name
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53 if self.default:
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54 return 'Enter %s [DEFAULT: %s]: ' % (description, repr(self.default))
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55 else:
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56 return 'Enter %s: ' % description
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58 def __repr__(self):
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59 return "Variable(name='%s')" % self.name
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61 def assemble(*args):
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62 names = set()
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63 retval = []
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64 for arg in args:
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65 if issubclass(arg, MakeItSoTemplate):
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66 arg = arg.vars
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67 for variable in arg:
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68 if variable.name in names:
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69 continue
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70 retval.append(variable.copy())
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71 names.add(variable.name)
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72 return retval
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73
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74 class MakeItSoTemplate(ContentTemplate):
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75 """API template for MakeItSo"""
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76
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77 # name of the template
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78 name = ''
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79
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80 # description of the template
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81 description = ''
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82
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83 # templates to interpolate
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84 # paths are relative to __file__ unless absolute or URIs
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85 templates = []
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86
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87 # variables
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88 vars = []
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89
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90 # inspect the templates for more variables
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91 look = False
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92
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93 def __init__(self, interactive=True, usedefaults=True, variables=None):
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94 """
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95 - output : output file or directory
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96 - interactive : whether tointeractively get variables
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97 - usedefaults : try to use the default values if not specified
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98 """
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99
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100 # boilerplate
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101 variables = variables or {}
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102 if not self.description and hasattr(self, '__doc__'):
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103 self.description = self.__doc__
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104 self.interactive = interactive
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105 _file = sys.modules[self.__class__.__module__].__file__
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106 self.location = os.path.dirname(os.path.abspath(_file))
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107 self.defaults = variables.copy()
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108 self.usedefaults = usedefaults
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109
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110 # make a dictionary of the variables for lookup convenience
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111 self.vardict = {}
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112 for i in self.vars:
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113 self.vardict[i.name] = i
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114
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115 # ensure all of these templates exist
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116 self._templates = []
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117 for template in self.templates:
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118 if template.startswith('http://') or template.startswith('https://'):
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119 self._templates.append(template)
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120 continue
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121 if os.path.isabs(template):
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122 path = template
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123 else:
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124 path = os.path.join(self.location, template)
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125 assert os.path.exists(path), "%s does not exist" % path
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126 self._templates.append(path)
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127
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128 def get_variables(self, **variables):
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129 # XXX could do this in the ctor
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130 vars = ContentTemplate.get_variables(self, **variables)
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131 if self.usedefaults:
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132 for variable in self.vars:
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133 if variable.name in vars:
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134 continue
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135 if variable.default is not Undefined:
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136 vars[variable.name] = variable.default
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137 return vars
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138
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139 def missing(self, **variables):
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140 vars = self.get_variables(**variables)
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141 missing = set([])
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142
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143 # get known needed variables
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144 for var in self.vars:
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145 if var.name in vars:
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146 if var.default is Undefined:
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147 missing.add(var.name)
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148 continue
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149 if (not self.usedefaults) and (not var.isset()):
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150 missing.add(var.name)
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151 else:
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152 missing.add(var.name)
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153
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154 if self.look:
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155 # scan templates for other variables
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156 template = PolyTemplate(self._templates,
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157 interactive=self.interactive,
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158 variables=vars)
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159 missing.update(template.missing())
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160
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161 return missing
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162
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163 def pre(self, variables, output):
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164 """do stuff before interpolation"""
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165
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166 def substitute(self, variables, output=None):
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167 """do the substitution"""
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168
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169 vars = self.get_variables(**variables)
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170 self.pre(vars, output)
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171 self.check_missing(vars)
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172
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173 # do the substitution
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174 template = PolyTemplate(self._templates,
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175 interactive=self.interactive,
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176 variables=vars)
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177 template.check_output(output)
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178 template.substitute({}, output)
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179
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180 self.post(vars, output)
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181
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182 def post(self, variables, output):
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183 """do stuff after interpolation"""
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184
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185 def read_variables(self, variables):
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186 """read variables from stdin"""
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187 retval = {}
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188 for i in variables:
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189 if i in self.vardict:
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190 value = self.vardict[i].read()
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191 retval[i] = value
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192 else:
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193 retval.update(ContentTemplate.read_variables(self, (i,)))
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194 return retval
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195
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196 class PasteScriptTemplate(MakeItSoTemplate):
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197 """template for backwards compatability with PasteScript"""