Mercurial > hg > MakeItSo

annotate makeitso/makeitso.py @ 23:776805790c84

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stub out getting tempita from the net; unttested
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 30 Nov 2010 09:17:22 -0800
parents fc2867bc2ba6
children 1b802678b341
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python
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2 """
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3 filesystem template interpreter
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4 """
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5
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6 import os
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7 import re
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8 import subprocess
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9 import sys
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10 import tempfile
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11 import urllib
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12
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13 from optparse import OptionParser
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14
21
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15 # URL of this file
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16 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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17
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18 # URL of tempita
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19 tempita_location = 'http://bitbucket.org/ianb/tempita/raw-file/tip/tempita/'
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20
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21 def cleanup():
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22 if 'tempdir' in globals():
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23 ### TODO: remove it
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24 pass
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25
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26 try:
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27 import tempita
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28 except ImportError:
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29
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30 # Get tempita from the net
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31 def getFiles(url, subdir, files):
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32 """
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33 fetch files from the internet
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34 - url : base url
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35 - subdirectory: to put things in
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36 - files : list of files to retrieve
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37 returns the location of a temporary directory
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38 """
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39 globals()['tempdir'] = tempfile.mkdtemp()
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40 os.mkdir(subdir)
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41 url = url.rstrip('/')
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42 for filename in files:
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43 f, headers = urllib.urlretrive('%s/%s' % (url, filename))
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44 content = file(f).read()
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45 outfile = os.path.join(globals()['tempdir'], subdir, filename)
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46 o = file(outfile, 'w')
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47 print >> o, content
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48 return globals()['tempdir']
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49
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50 tempita_files = ['__init__.py', '_looper.py', 'compat3.py']
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51
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52 try:
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53 t = getFiles(tempita_location, 'tempita', tempita_files)
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54 sys.path.append(t)
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55 import tempita
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56 except:
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57 cleanup()
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58 raise NotImplementedError('This should say something like youre not connected to the net')
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59
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60
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61
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62 # regular expressions for finding the shebang
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63 shebang_re = '#!.*makeitso.*'
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64 shebang_re = re.compile(shebang_re)
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65
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66 class MissingVariablesException(Exception):
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67 def __init__(self, message, missing):
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68 self.missing = missing
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69
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70 def call(command, *args, **kw):
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71 code = subprocess.call(command, *args, **kw)
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72 if code:
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73 if isinstance(command, basestring):
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74 cmdstr = command
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75 else:
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76 cmdstr = ' '.join(command)
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77 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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78
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79 def get_missing(name_error):
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80 """
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81 This is a horrible hack because python doesn't do the proper thing
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82 via eval and return the name of the variable; instead, it just gives
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83 you a message:
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84 >>> try:
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85 ... eval('2*foo')
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86 ... except Exception, e:
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87 ... pass
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88 """
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89 message = name_error.args[0]
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90 varname = message.split("'")[1]
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91 return varname
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92
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93 def missing_variables(template, variables):
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94 """return additional variables needed"""
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95 vars = variables.copy()
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96 missing = set([])
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97 while True:
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98 try:
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99 template.substitute(**vars)
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100 return missing
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101 except NameError, e:
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102 missed = get_missing(e)
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103 missing.add(missed)
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104 vars[missed] = ''
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105 return missing
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106
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107 def template_variables(template):
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108 """return the variables needed for a template"""
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109 return missing_variables(template, {})
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110
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111 def read_variables(variables):
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112 retval = {}
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113 for i in variables:
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114 print 'Enter %s: ' % i,
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115 retval[i] = raw_input()
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116 return retval
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117
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118 def substitute(content, variables=None):
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119 """interactive (for now) substitution"""
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120
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121 # remove makeitso shebang if it has one
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122 if shebang_re.match(content):
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123 content = os.linesep.join(content.splitlines()[1:])
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124
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125 variables = variables or {}
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126 template = tempita.Template(content)
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127 missing = missing_variables(template, variables)
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128 if missing:
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129 # TODO: add a switch for interactive or not
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130 variables.update(read_variables(missing))
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131 return template.substitute(**variables)
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132
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133 def invocation(url, **variables):
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134 """returns a string appropriate for TTW invocation"""
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135 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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136 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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137
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138 def main(args=sys.argv[1:]):
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139
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140 # create option parser
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141 usage = '%prog [options] template <template> <...>'
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142 parser = OptionParser(usage, description=__doc__)
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143 parser.add_option('-[', '--start-braces', dest='start_braces',
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144 help='starting delimeter')
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145 parser.add_option('-]', '--end-braces', dest='end_braces',
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146 help='starting delimeter')
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147 parser.add_option('--in-place', dest='in_place',
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148 action='store_true', default=False,
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149 help='interpret files in place') # TODO: unused
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150 parser.add_option('--commandline', dest='commandline',
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151 action='store_true', default=False,
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152 help="print the commandline to invoke this script TTW")
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153 parser.add_option('--variables', dest='variables',
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154 action='store_true', default=False,
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155 help='print the variables in a template')
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156 options, args = parser.parse_args(args)
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157
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158 # print the variables for the templates
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159 if options.variables:
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160
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161 # makes no sense without a template
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162 if not args:
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163 parser.print_usage()
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164 parser.exit()
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165
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166 # find all variables
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167 variables = set()
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168 for arg in args:
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169 content = file(arg).read()
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170 template = tempita.Template(content)
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171 variables.update(template_variables(template))
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172
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173 # print them
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174 for variable in variables:
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175 print variable
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176 return
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177
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178 # template variables
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179 variables = {}
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180 _vars = []
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181 _args = []
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182 for arg in args:
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183 if '=' in arg:
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184 key, value = arg.split('=')
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185 variables[key] = value
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186 else:
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187 _args.append(arg)
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188 args = _args
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189
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190 # print TTW commandline for invocation
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191 if options.commandline:
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192 if args:
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193 for arg in args:
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194 print invocation(arg, **variables)
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195 else:
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196 print invocation('[URL]', **variables)
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197 return
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198
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199 # get the content
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200 if args:
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201 for arg in args:
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202 f, headers = urllib.urlretrieve(arg)
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203 content = file(f).read()
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204 print substitute(content, variables=variables)
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205 else:
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206 content = sys.stdin.read()
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207 print substitute(content, variables=variables)
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208
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209 # cleanup
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210 cleanup()
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211
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212 if __name__ == '__main__':
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213 main()