Mercurial > hg > MakeItSo

annotate makeitso/makeitso.py @ 24:1b802678b341

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add note about urllib and timeouts
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 30 Nov 2010 09:21:22 -0800
parents 776805790c84
children fbf19940fa97
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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 # TODO: may have to use urllib2.urlopen to get reasonable timeouts
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13
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14 from optparse import OptionParser
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15
21
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16 # URL of this file
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17 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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18
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19 # URL of tempita
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20 tempita_location = 'http://bitbucket.org/ianb/tempita/raw-file/tip/tempita/'
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21
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22 def cleanup():
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23 if 'tempdir' in globals():
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24 ### TODO: remove it
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25 pass
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27 try:
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28 import tempita
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29 except ImportError:
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30
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31 # Get tempita from the net
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32 def getFiles(url, subdir, files):
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33 """
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34 fetch files from the internet
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35 - url : base url
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36 - subdirectory: to put things in
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37 - files : list of files to retrieve
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38 returns the location of a temporary directory
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39 """
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40 globals()['tempdir'] = tempfile.mkdtemp()
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41 os.mkdir(subdir)
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42 url = url.rstrip('/')
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43 for filename in files:
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44 f, headers = urllib.urlretrive('%s/%s' % (url, filename))
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45 content = file(f).read()
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46 outfile = os.path.join(globals()['tempdir'], subdir, filename)
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47 o = file(outfile, 'w')
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48 print >> o, content
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49 return globals()['tempdir']
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51 tempita_files = ['__init__.py', '_looper.py', 'compat3.py']
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52
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53 try:
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54 t = getFiles(tempita_location, 'tempita', tempita_files)
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55 sys.path.append(t)
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56 import tempita
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57 except:
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58 cleanup()
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59 raise NotImplementedError('This should say something like youre not connected to the net')
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60
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61
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62
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63 # regular expressions for finding the shebang
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64 shebang_re = '#!.*makeitso.*'
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65 shebang_re = re.compile(shebang_re)
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66
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67 class MissingVariablesException(Exception):
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68 def __init__(self, message, missing):
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69 self.missing = missing
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70
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71 def call(command, *args, **kw):
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72 code = subprocess.call(command, *args, **kw)
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73 if code:
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74 if isinstance(command, basestring):
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75 cmdstr = command
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76 else:
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77 cmdstr = ' '.join(command)
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78 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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79
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80 def get_missing(name_error):
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81 """
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82 This is a horrible hack because python doesn't do the proper thing
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83 via eval and return the name of the variable; instead, it just gives
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84 you a message:
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85 >>> try:
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86 ... eval('2*foo')
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87 ... except Exception, e:
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88 ... pass
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89 """
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90 message = name_error.args[0]
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91 varname = message.split("'")[1]
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92 return varname
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93
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94 def missing_variables(template, variables):
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95 """return additional variables needed"""
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96 vars = variables.copy()
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97 missing = set([])
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98 while True:
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99 try:
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100 template.substitute(**vars)
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101 return missing
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102 except NameError, e:
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103 missed = get_missing(e)
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104 missing.add(missed)
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105 vars[missed] = ''
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106 return missing
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107
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108 def template_variables(template):
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109 """return the variables needed for a template"""
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110 return missing_variables(template, {})
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111
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112 def read_variables(variables):
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113 retval = {}
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114 for i in variables:
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115 print 'Enter %s: ' % i,
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116 retval[i] = raw_input()
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117 return retval
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118
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119 def substitute(content, variables=None):
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120 """interactive (for now) substitution"""
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121
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122 # remove makeitso shebang if it has one
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123 if shebang_re.match(content):
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124 content = os.linesep.join(content.splitlines()[1:])
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125
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126 variables = variables or {}
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127 template = tempita.Template(content)
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128 missing = missing_variables(template, variables)
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129 if missing:
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130 # TODO: add a switch for interactive or not
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131 variables.update(read_variables(missing))
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132 return template.substitute(**variables)
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133
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134 def invocation(url, **variables):
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135 """returns a string appropriate for TTW invocation"""
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136 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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137 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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138
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139 def main(args=sys.argv[1:]):
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140
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141 # create option parser
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142 usage = '%prog [options] template <template> <...>'
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143 parser = OptionParser(usage, description=__doc__)
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144 parser.add_option('-[', '--start-braces', dest='start_braces',
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145 help='starting delimeter')
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146 parser.add_option('-]', '--end-braces', dest='end_braces',
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147 help='starting delimeter')
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148 parser.add_option('--in-place', dest='in_place',
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149 action='store_true', default=False,
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150 help='interpret files in place') # TODO: unused
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151 parser.add_option('--commandline', dest='commandline',
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152 action='store_true', default=False,
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153 help="print the commandline to invoke this script TTW")
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154 parser.add_option('--variables', dest='variables',
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155 action='store_true', default=False,
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156 help='print the variables in a template')
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157 options, args = parser.parse_args(args)
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158
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159 # print the variables for the templates
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160 if options.variables:
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161
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162 # makes no sense without a template
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163 if not args:
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164 parser.print_usage()
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165 parser.exit()
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166
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167 # find all variables
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168 variables = set()
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169 for arg in args:
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170 content = file(arg).read()
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171 template = tempita.Template(content)
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172 variables.update(template_variables(template))
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173
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174 # print them
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175 for variable in variables:
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176 print variable
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177 return
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178
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179 # template variables
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180 variables = {}
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181 _vars = []
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182 _args = []
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183 for arg in args:
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184 if '=' in arg:
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185 key, value = arg.split('=')
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186 variables[key] = value
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187 else:
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188 _args.append(arg)
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189 args = _args
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190
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191 # print TTW commandline for invocation
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192 if options.commandline:
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193 if args:
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194 for arg in args:
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195 print invocation(arg, **variables)
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196 else:
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197 print invocation('[URL]', **variables)
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198 return
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199
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200 # get the content
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201 if args:
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202 for arg in args:
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203 f, headers = urllib.urlretrieve(arg)
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204 content = file(f).read()
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205 print substitute(content, variables=variables)
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206 else:
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207 content = sys.stdin.read()
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208 print substitute(content, variables=variables)
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209
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210 # cleanup
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211 cleanup()
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212
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213 if __name__ == '__main__':
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214 main()