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annotate makeitso/makeitso.py @ 92:bfab7367eb56

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add some more documentation tidbits
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 10 Jan 2011 21:49:43 -0800
parents 26b9c3bba04e
children d5da38fabdf7
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1 #!/usr/bin/env python
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2
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3 """
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4 filesystem template interpreter
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5 """
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6
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7 import inspect
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8 import os
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9 import re
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10 import shutil
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11 import subprocess
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12 import sys
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13 import tempfile
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14 import urllib
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15 # TODO: may have to use urllib2.urlopen to get reasonable timeouts
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16
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17 from optparse import OptionParser
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19 # URL of -this file-
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20 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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22 ### import tempita
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23
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24 # URL of tempita
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25 tempita_location = 'http://bitbucket.org/ianb/tempita/raw-file/tip/tempita/'
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27 def cleanup():
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28 # remove temporary net module directory
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29 if 'tempdir' in globals():
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30 shutil.remove(tempdir)
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31 try:
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32 import tempita
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33 except ImportError:
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35 # Get tempita from the net
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36 # TODO: abstract this to get arbitrary modules from the net
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37 def getFiles(url, subdir, files):
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38 """
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39 fetch files from the internet
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40 - url : base url
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41 - subdirectory: to put things in
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42 - files : list of files to retrieve
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43 returns the location of a temporary directory
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44 """
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45 globals()['tempdir'] = tempfile.mkdtemp()
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46 os.mkdir(subdir)
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47 url = url.rstrip('/')
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48 for filename in files:
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49 f, headers = urllib.urlretrive('%s/%s' % (url, filename))
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50 content = file(f).read()
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51 outfile = os.path.join(globals()['tempdir'], subdir, filename)
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52 o = file(outfile, 'w')
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53 print >> o, content
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54 return globals()['tempdir']
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55
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56 tempita_files = ['__init__.py', '_looper.py', 'compat3.py']
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58 try:
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59 t = getFiles(tempita_location, 'tempita', tempita_files)
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60 sys.path.append(t)
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61 import tempita
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62 except:
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63 cleanup()
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64 raise NotImplementedError('This should say something like youre not connected to the net')
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65
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66 # does tempita support delimeters?
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67 has_delimeters = 'delimeters' in inspect.getargspec(tempita.Template.__init__).args
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68
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69 # regular expressions for finding the shebang
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70 shebang_re = '#!.*makeitso.*'
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71 shebang_re = re.compile(shebang_re)
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72
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73 ### URIs
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74
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75 def parent_uri(uri):
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76 """parent resource of a URI"""
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77
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78 if '://' in uri:
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79 return uri.rsplit('/', 1)[0] + '/'
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80 else:
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81 here = os.path.dirname(os.path.abspath(uri))
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82 here = here.rstrip(os.path.sep) + os.path.sep
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83 return here
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84
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85 def basename(uri):
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86 """return the basename of a URI"""
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87 if '://' in uri:
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88 return uri.rsplit('/', 1)[1]
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89 else:
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90 return os.path.basename(uri)
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91
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92 def include(uri):
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93 f, headers = urllib.urlretrieve(uri) # XXX -> urllib2 for timeout
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94 return file(f).read()
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95
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96 ### things that deal with variables
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97
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98 class MissingVariablesException(Exception):
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99 """exception for (non-interactive) missing variables"""
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100 def __init__(self, missing):
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101 self.missing = missing
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102 message = 'Missing variables: %s' % ', '.join(missing)
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103 Exception.__init__(self, message)
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104
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105 def get_missing(name_error):
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106 """
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107 This is a horrible hack because python doesn't do the proper thing
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108 via eval and return the name of the variable; instead, it just gives
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109 you a message:
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110 >>> try:
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111 ... eval('2*foo')
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112 ... except Exception, e:
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113 ... pass
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114 """
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115 message = name_error.args[0]
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116 varname = message.split("'")[1]
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117 return varname
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118
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119 ### template classes
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120
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121 class ContentTemplate(tempita.Template):
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122 """MakeItSo's extension of tempita's Template class"""
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123
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124 defaults = {'include': include}
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125
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126 def __init__(self, content, name=None, interactive=True, variables=None):
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127
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128 # default variables
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129 self.defaults = self.__class__.defaults.copy()
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130 self.defaults.update(variables or {})
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131
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132 # TODO: automagically tell if the program is interactive or not
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133 self.interactive = interactive
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134
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135 tempita.Template.__init__(self, content, name=name)
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136
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137 def get_variables(self, **variables):
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138 """the template's augmented variable set"""
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139 vars = self.defaults.copy()
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140 vars.update(variables)
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141 return vars
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142
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143 def missing(self, **variables):
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144 """return additional variables needed"""
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145 vars = self.get_variables(**variables)
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146 missing = set([])
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147 while True:
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148 try:
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149 tempita.Template.substitute(self, **vars)
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150 return missing
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151 except NameError, e:
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152 missed = get_missing(e)
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153 missing.add(missed)
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154 vars[missed] = ''
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155 return missing
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156
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157 def check_missing(self, vars):
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158 """
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159 check for missing variables and, if applicable,
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160 update them from the command line
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161 """
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162 missing = self.missing(**vars)
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163 if missing:
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164 if self.interactive:
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165 vars.update(self.read_variables(missing))
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166 else:
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167 raise MissingVariablesException(missing)
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168
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169
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170 def variables(self):
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171 """return the variables needed for a template"""
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172 return self.missing()
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173
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174 def substitute(self, **variables):
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175 """interactive (for now) substitution"""
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176 vars = self.get_variables(**variables)
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177 self.check_missing(vars)
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178 return tempita.Template.substitute(self, **vars)
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179
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180 def read_variables(self, variables):
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181 """read variables from stdin"""
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182 # TODO: variables should (optionally) be richer objects
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183 retval = {}
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184 for i in variables:
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185 print 'Enter %s: ' % i,
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186 retval[i] = raw_input()
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187 return retval
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188
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189
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190 class URITemplate(ContentTemplate):
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191 """template for a file or URL"""
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192
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193 def __init__(self, uri, interactive=True, variables=None):
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194 content = include(uri)
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195
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196 # remove makeitso shebang if it has one
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197 if shebang_re.match(content):
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198 content = os.linesep.join(content.splitlines()[1:])
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199
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200 variables = variables or {}
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201 if 'here' not in variables:
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202 variables['here'] = parent_uri(uri)
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203 # TODO: could add other metadata about the uri,
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204 # such as last modification time'
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205
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206 ContentTemplate.__init__(self, content, name=uri,
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207 interactive=interactive,
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208 variables=variables)
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209
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210 def substitute(self, variables, output=None):
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211 content = ContentTemplate.substitute(self, **variables)
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212
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213 # write output
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214 output = output or sys.stdout
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215 if isinstance(output, basestring):
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216 path = output
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217 if os.path.isdir(output):
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218 path = os.path.join(path, basename(self.name))
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219 f = file(path, 'w')
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220 print >> f, content
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221 f.close()
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222 try:
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223 os.chmod(path, os.stat(self.name).st_mode)
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224 except:
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225 pass
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226 else:
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227 # file handler
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228 print >> output, content
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229
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230
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231 class DirectoryTemplate(ContentTemplate):
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232 """template for a directory structure"""
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233
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234 def __init__(self, directory, interactive=True, variables=None):
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235 """
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236 - output : output directory; if None will render in place
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237 """
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238 assert os.path.isdir(directory)
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239 self.name = directory
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240 self.interactive = interactive
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241 self.defaults = ContentTemplate.defaults.copy()
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242 self.defaults.update(variables or {})
34
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243
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244 def check_output(self, output):
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245 """
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246 checks output for validity
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247 """
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248 assert output # must provide output
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249 if os.path.exists(output):
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250 assert os.path.isdir(output), "%s: Must be a directory" % self.name
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251
34
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252 def missing(self, **variables):
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253 vars = self.defaults.copy()
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254 vars.update(variables)
34
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255 missing = set([])
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256 for dirpath, dirnames, filenames in os.walk(self.name):
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257
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258 # find variables from directory names
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259 for d in dirnames:
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260 missed = ContentTemplate(d).missing(**vars)
34
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261 missing.update(missed)
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262 variables.update(dict([(i, '') for i in missed]))
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263
34
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264 # find variables from files
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265 for f in filenames:
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266 missed = ContentTemplate(d).missing(**vars)
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267 missing.update(missed)
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268 variables.update(dict([(i, '') for i in missed]))
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269
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270 path = os.path.join(dirpath, f)
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271 template = URITemplate(path, interactive=self.interactive)
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272 missed = template.missing(**vars)
34
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273 missing.update(missed)
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274 variables.update(dict([(i, '') for i in missed]))
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275
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276 return missing
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277
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278 def substitute(self, variables, output):
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279 self.check_output(output)
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280 vars = self.get_variables(**variables)
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281 self.check_missing(vars)
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282
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283 # TODO: do this with recursion instead of os.walk so that
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284 # per-directory control may be asserted
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285
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286 # make output directory if necessary
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287 if output and not os.path.exists(output):
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288 os.makedirs(output)
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289
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290 for dirname, dirnames, filenames in os.walk(self.name):
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291
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292 # interpolate directory names
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293 for d in dirnames:
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294 path = os.path.join(dirname, d)
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295 interpolated = ContentTemplate(path).substitute(**variables)
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296 target = os.path.join(output, interpolated.split(self.name, 1)[-1].strip(os.path.sep))
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297
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298 if os.path.exists(target):
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299 # ensure its a directory
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300 # TODO: check this first before interpolation is in progress
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301 assert os.path.isdir(target), "Can't substitute a directory on top of the file"
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302 else:
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303 os.makedirs(target)
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304
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305 # interpolate files
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306 for filename in filenames:
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307
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308 # interpolate filenames
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309 path = os.path.join(dirname, filename)
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310 interpolated = ContentTemplate(path).substitute(**variables)
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311 target = os.path.join(output, interpolated.split(self.name, 1)[-1].strip(os.path.sep))
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312
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313 # interpolate their contents
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314 if os.path.exists(target):
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315 # ensure its a directory
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316 assert os.path.isfile(target), "Can't substitute a file on top of a directory"
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317 template = URITemplate(path, interactive=False)
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318 template.substitute(variables, target)
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319
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320
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321 class PolyTemplate(ContentTemplate):
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322 """template for several files/directories"""
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323
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324 def __init__(self, templates, interactive=True, variables=None):
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325
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326 self.interactive = interactive
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327 self._templates = templates[:]
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328 self.templates = []
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329 for template in templates:
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330 # TODO: check if the template is a [e.g] PasteScript.template entry point
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331 if os.path.isdir(template):
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332 self.templates.append(DirectoryTemplate(template, interactive=self.interactive, variables=variables))
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333 else:
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334 self.templates.append(URITemplate(template, interactive=self.interactive, variables=variables))
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335
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336 def missing(self, **variables):
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337 vars = variables.copy()
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338 missing = set([])
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339 for template in self.templates:
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340 missed = template.missing(**vars)
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341 missing.update(missed)
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342 vars.update(dict([(i, '') for i in missed]))
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343 return missing
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344
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345 def check_output(self, output):
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346 if output and isinstance(output, basestring) and os.path.exists(output) and len(self.templates) > 1:
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347 assert os.path.isdir(output), "Must specify a directory for multiple templates"
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348 for template in self.templates:
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349 if hasattr(template, 'check_output'):
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350 template.check_output(output)
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351
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352 def substitute(self, variables, output=None):
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353
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354 # determine where the hell to put these things
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355 self.check_output(output)
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356
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357 # get the variables
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358 vars = self.get_variables(**variables)
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359 self.check_missing(vars)
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360
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361 # make the output directory
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362 if output and len(self.templates) > 1 and not os.path.exists(output):
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363 os.makedirs(output)
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364
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365 # do the substitution
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366 for template in self.templates:
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367 template.substitute(vars, output)
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368
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369 ### command line interface
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370
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371 def invocation(url, **variables):
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372 """returns a string appropriate for TTW invocation"""
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373 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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374 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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375
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376 def main(args=sys.argv[1:]):
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377
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378 # create option parser
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379 usage = '%prog [options] template <template> <...>'
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380 parser = OptionParser(usage, description=__doc__)
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381
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382 # delimeters
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383 # XXX needs tempita trunk
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384 if has_delimeters:
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385 parser.add_option('-[', '--start-braces', dest='start_braces',
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386 help='starting delimeter')
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387 parser.add_option('-]', '--end-braces', dest='end_braces',
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388 help='starting delimeter')
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389
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390 # options about where to put things
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391 parser.add_option('-o', '--output', dest='output',
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392 help='where to put the output (filename or directory)')
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393
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394 # options for getting information
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395 parser.add_option('--commandline', dest='commandline',
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diff changeset
396 action='store_true', default=False,
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397 help="print the commandline to invoke this script TTW")
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398 parser.add_option('--variables', dest='variables',
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399 action='store_true', default=False,
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400 help='print the variables in a template')
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401
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402 options, args = parser.parse_args(args)
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403
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404 # print the variables for the templates
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405 if options.variables:
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diff changeset
406
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diff changeset
407 # makes no sense without a template
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408 if not args:
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409 parser.print_usage()
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diff changeset
410 parser.exit()
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diff changeset
411
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diff changeset
412 # find all variables
34
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diff changeset
413 template = PolyTemplate(templates=args)
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414 variables = template.variables()
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415
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diff changeset
416 # print them
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417 for variable in sorted(variables):
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418 print variable
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419 return
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420
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421 # template variables
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diff changeset
422 variables = {}
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423 _args = []
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424 for arg in args:
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425 if '=' in arg:
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426 key, value = arg.split('=')
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427 variables[key] = value
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428 else:
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429 _args.append(arg)
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430 args = _args
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431
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diff changeset
432 # print TTW commandline for invocation
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433 if options.commandline:
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diff changeset
434 if args:
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435 for arg in args:
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diff changeset
436 print invocation(arg, **variables)
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diff changeset
437 else:
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diff changeset
438 print invocation('[URI]', **variables)
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diff changeset
439 return
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diff changeset
440
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441 # get the content
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442 if args:
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443 template = PolyTemplate(templates=args,
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diff changeset
444 variables=variables)
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diff changeset
445 template.substitute(output=options.output)
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446 else:
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diff changeset
447 template = ContentTemplate(sys.stdin.read(), variables=variables)
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448 print template.substitute()
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diff changeset
449
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450 # cleanup
776805790c84 stub out getting tempita from the net; unttested
Jeff Hammel <jhammel@mozilla.com>
parents: 22
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451 cleanup()
5
f064be514e53 choose a better filename and remove some stuff from shebang
Jeff Hammel <jhammel@mozilla.com>
parents:
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452
f064be514e53 choose a better filename and remove some stuff from shebang
Jeff Hammel <jhammel@mozilla.com>
parents:
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453 if __name__ == '__main__':
f064be514e53 choose a better filename and remove some stuff from shebang
Jeff Hammel <jhammel@mozilla.com>
parents:
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454 main()