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annotate makeitso/makeitso.py @ 31:17f46f0e0a4a

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stub of using classes for this
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 22 Dec 2010 15:27:13 -0800
parents 1549be7f0fcb
children 9422d4ad6c2c
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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 inspect
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7 import os
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8 import re
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9 import shutil
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10 import subprocess
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11 import sys
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12 import tempfile
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13 import urllib
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14 # TODO: may have to use urllib2.urlopen to get reasonable timeouts
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15
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16 from optparse import OptionParser
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17
21
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18 # URL of this file
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19 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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20
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21 # URL of tempita
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22 tempita_location = 'http://bitbucket.org/ianb/tempita/raw-file/tip/tempita/'
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23
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24 def cleanup():
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25 # remove temporary net module directory
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26 if 'tempdir' in globals():
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27 shutil.remove(tempdir)
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29 try:
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30 import tempita
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31 except ImportError:
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32
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33 # Get tempita from the net
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34 # TODO: abstract this to get arbitrary modules from the net
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35 def getFiles(url, subdir, files):
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36 """
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37 fetch files from the internet
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38 - url : base url
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39 - subdirectory: to put things in
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40 - files : list of files to retrieve
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41 returns the location of a temporary directory
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42 """
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43 globals()['tempdir'] = tempfile.mkdtemp()
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44 os.mkdir(subdir)
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45 url = url.rstrip('/')
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46 for filename in files:
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47 f, headers = urllib.urlretrive('%s/%s' % (url, filename))
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48 content = file(f).read()
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49 outfile = os.path.join(globals()['tempdir'], subdir, filename)
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50 o = file(outfile, 'w')
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51 print >> o, content
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52 return globals()['tempdir']
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53
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54 tempita_files = ['__init__.py', '_looper.py', 'compat3.py']
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55
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56 try:
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57 t = getFiles(tempita_location, 'tempita', tempita_files)
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58 sys.path.append(t)
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59 import tempita
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60 except:
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61 cleanup()
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62 raise NotImplementedError('This should say something like youre not connected to the net')
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63
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64 # does tempita support delimeters?
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65 has_delimeters = 'delimeters' in inspect.getargspec(tempita.Template.__init__).args
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66
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67 # regular expressions for finding the shebang
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68 shebang_re = '#!.*makeitso.*'
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69 shebang_re = re.compile(shebang_re)
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70
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71 def base_uri(uri):
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72 if '://' in uri:
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73 return 'uri'.rsplit('/', 1)[0] + '/'
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74 else:
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75 here = os.path.dirname(os.path.abspath('me'))
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76 here = here.rstrip(os.path.sep) + os.path.sep
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77 return here
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78
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79 def include(uri):
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80 f, headers = urllib.urlretrieve(uri)
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81 return file(f).read()
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82
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83 ### things that deal with variables
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84
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85 # XXX duplicated in URITemplate namespace....don't need two
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86 defaults = {'include': include}
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87
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88 class MissingVariablesException(Exception):
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89 """exception for (non-interactive) missing variables"""
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90 def __init__(self, message, missing):
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91 self.missing = missing
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92
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93 class ContentTemplate(tempita.Template):
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94 """MakeItSo's extension of tempita's Template class"""
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95 defaults = {'include': include}
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96 def __init__(self):
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97 raise NotImplementedError
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98
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99 class URITemplate(tempita.Template):
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100
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101 def __init__(self):
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102 raise NotImplementedError
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103
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104 class DirectoryTemplate(tempita.Template):
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105 def __init__(self):
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106 raise NotImplementedError
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107
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108 def get_missing(name_error):
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109 """
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110 This is a horrible hack because python doesn't do the proper thing
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111 via eval and return the name of the variable; instead, it just gives
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112 you a message:
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113 >>> try:
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114 ... eval('2*foo')
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115 ... except Exception, e:
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116 ... pass
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117 """
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118 message = name_error.args[0]
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119 varname = message.split("'")[1]
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120 return varname
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121
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122 def missing_variables(template, variables):
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123 """return additional variables needed"""
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124 vars = variables.copy()
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125 missing = set([])
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126 while True:
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127 try:
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128 template.substitute(**vars)
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129 return missing
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130 except NameError, e:
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131 missed = get_missing(e)
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132 missing.add(missed)
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133 vars[missed] = ''
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134 return missing
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135
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136 def template_variables(template):
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137 """return the variables needed for a template"""
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138 return missing_variables(template, {})
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139
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140 def read_variables(variables):
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141 retval = {}
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142 for i in variables:
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143 print 'Enter %s: ' % i,
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144 retval[i] = raw_input()
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145 return retval
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146
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147 ### functions for substitution
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148
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149 def substitute(content, variables=None):
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150 """interactive (for now) substitution"""
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151
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152 # remove makeitso shebang if it has one
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153 if shebang_re.match(content):
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154 content = os.linesep.join(content.splitlines()[1:])
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155
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156 variables = variables or defaults.copy()
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157 template = tempita.Template(content)
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158 missing = missing_variables(template, variables)
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159 if missing:
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160 # TODO: add a switch for interactive or not
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161 variables.update(read_variables(missing))
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162 return template.substitute(**variables)
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163
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164 def substitute_directory(directory, output=None, variables=None):
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165 # TODO: interpolate directory names
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166
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167 ###
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168
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169 def invocation(url, **variables):
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170 """returns a string appropriate for TTW invocation"""
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171 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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172 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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173
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174 def main(args=sys.argv[1:]):
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175
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176 # create option parser
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177 usage = '%prog [options] template <template> <...>'
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178 parser = OptionParser(usage, description=__doc__)
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179
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180 # delimeters
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181 # XXX needs tempita trunk
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182 if has_delimeters:
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183 parser.add_option('-[', '--start-braces', dest='start_braces',
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184 help='starting delimeter')
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185 parser.add_option('-]', '--end-braces', dest='end_braces',
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186 help='starting delimeter')
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187
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188 # options about where to put things
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189 parser.add_option('--in-place', dest='in_place',
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190 action='store_true', default=False,
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191 help='interpret files in place') # TODO: unused
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192 parser.add_option('-o', '--output', dest='output',
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193 help='where to put the output (filename or directory)')
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194
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195 #
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196 parser.add_option('--commandline', dest='commandline',
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197 action='store_true', default=False,
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198 help="print the commandline to invoke this script TTW")
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199 parser.add_option('--variables', dest='variables',
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200 action='store_true', default=False,
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201 help='print the variables in a template')
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202 options, args = parser.parse_args(args)
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203
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204 # print the variables for the templates
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205 if options.variables:
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206
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207 # makes no sense without a template
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208 if not args:
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209 parser.print_usage()
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210 parser.exit()
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211
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212 # find all variables
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213 variables = set()
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214 for arg in args:
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215 content = file(arg).read()
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216 template = tempita.Template(content)
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217 variables.update(template_variables(template))
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218
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219 # print them
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220 for variable in variables:
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221 print variable
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222 return
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223
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224 # template variables
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225 variables = defaults.copy()
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226 _vars = []
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227 _args = []
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228 for arg in args:
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229 if '=' in arg:
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230 key, value = arg.split('=')
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231 variables[key] = value
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232 else:
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233 _args.append(arg)
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234 args = _args
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235
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236 # print TTW commandline for invocation
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237 if options.commandline:
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238 if args:
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239 for arg in args:
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240 print invocation(arg, **variables)
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241 else:
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242 print invocation('[URI]', **variables)
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243 return
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244
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245 # get the content
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246 if args:
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247 for arg in args:
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248 var_copy = variables.copy()
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249 var_copy['here'] = base_uri(arg)
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250 content = include(arg)
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251 print substitute(content, variables=var_copy)
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252 else:
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253 content = sys.stdin.read()
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254 print substitute(content, variables=variables)
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255
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256 # cleanup
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257 cleanup()
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258
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259 if __name__ == '__main__':
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260 main()