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annotate makeitso/makeitso.py @ 103:a6aff990985b

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do rudimentary interpretation of config files
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 11 Jan 2011 19:12:22 -0800
parents 80a57bf2b7f4
children e059a58ea23c
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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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17 from ConfigParser import RawConfigParser
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18 from optparse import OptionParser
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20 # URL of -this file-
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21 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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23 ### import tempita
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24
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25 # URL of tempita
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26 tempita_location = 'http://bitbucket.org/ianb/tempita/raw-file/tip/tempita/'
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28 def cleanup():
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29 # remove temporary net module directory
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30 if 'tempdir' in globals():
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31 shutil.remove(tempdir)
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32 try:
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33 import tempita
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34 except ImportError:
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35
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36 # Get tempita from the net
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37 # TODO: abstract this to get arbitrary modules from the net
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38 def getFiles(url, subdir, files):
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39 """
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40 fetch files from the internet
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41 - url : base url
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42 - subdirectory: to put things in
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43 - files : list of files to retrieve
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44 returns the location of a temporary directory
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45 """
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46 globals()['tempdir'] = tempfile.mkdtemp()
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47 os.mkdir(subdir)
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48 url = url.rstrip('/')
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49 for filename in files:
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50 f, headers = urllib.urlretrive('%s/%s' % (url, filename))
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51 content = file(f).read()
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52 outfile = os.path.join(globals()['tempdir'], subdir, filename)
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53 o = file(outfile, 'w')
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54 print >> o, content
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55 return globals()['tempdir']
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56
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57 tempita_files = ['__init__.py', '_looper.py', 'compat3.py']
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59 try:
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60 t = getFiles(tempita_location, 'tempita', tempita_files)
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61 sys.path.append(t)
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62 import tempita
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63 except:
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64 cleanup()
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65 raise NotImplementedError('This should say something like youre not connected to the net')
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67 # does tempita support delimeters?
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68 has_delimeters = 'delimeters' in inspect.getargspec(tempita.Template.__init__).args
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70 # regular expressions for finding the shebang
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71 shebang_re = '#!.*makeitso.*'
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72 shebang_re = re.compile(shebang_re)
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73
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74 ### URIs
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75
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76 def parent_uri(uri):
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77 """parent resource of a URI"""
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78
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79 if '://' in uri:
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80 return uri.rsplit('/', 1)[0] + '/'
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81 else:
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82 here = os.path.dirname(os.path.abspath(uri))
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83 here = here.rstrip(os.path.sep) + os.path.sep
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84 return here
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85
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86 def basename(uri):
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87 """return the basename of a URI"""
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88 if '://' in uri:
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89 return uri.rsplit('/', 1)[1]
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90 else:
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91 return os.path.basename(uri)
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92
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93 def include(uri):
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94 f, headers = urllib.urlretrieve(uri) # XXX -> urllib2 for timeout
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95 return file(f).read()
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96
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97 ### things that deal with variables
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98
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99 class MissingVariablesException(Exception):
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100 """exception for (non-interactive) missing variables"""
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101 def __init__(self, missing):
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102 self.missing = missing
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103 message = 'Missing variables: %s' % ', '.join(missing)
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104 Exception.__init__(self, message)
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105
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106 def get_missing(name_error):
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107 """
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108 This is a horrible hack because python doesn't do the proper thing
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109 via eval and return the name of the variable; instead, it just gives
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110 you a message:
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111 >>> try:
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112 ... eval('2*foo')
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113 ... except Exception, e:
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114 ... pass
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115 """
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116 message = name_error.args[0]
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117 varname = message.split("'")[1]
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118 return varname
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119
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120 ### template classes
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121
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122 class ContentTemplate(tempita.Template):
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123 """MakeItSo's extension of tempita's Template class"""
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124
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125 defaults = {'include': include}
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126
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127 def __init__(self, content, name=None, interactive=True, variables=None):
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128
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129 # default variables
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130 self.defaults = self.__class__.defaults.copy()
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131 self.defaults.update(variables or {})
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132
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133 # TODO: automagically tell if the program is interactive or not
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134 self.interactive = interactive
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135
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136 tempita.Template.__init__(self, content, name=name)
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137
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138 def get_variables(self, **variables):
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139 """the template's augmented variable set"""
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140 vars = self.defaults.copy()
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141 vars.update(variables)
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142 return vars
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143
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144 def missing(self, **variables):
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145 """return additional variables needed"""
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146 vars = self.get_variables(**variables)
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147 missing = set([])
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148 while True:
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149 try:
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150 tempita.Template.substitute(self, **vars)
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151 return missing
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152 except NameError, e:
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153 missed = get_missing(e)
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154 missing.add(missed)
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155 vars[missed] = ''
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156 return missing
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157
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158 def check_missing(self, vars):
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159 """
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160 check for missing variables and, if applicable,
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161 update them from the command line
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162 """
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163 missing = self.missing(**vars)
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164 if missing:
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165 if self.interactive:
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166 vars.update(self.read_variables(missing))
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167 else:
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168 raise MissingVariablesException(missing)
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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
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212 # interpolate
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213 content = ContentTemplate.substitute(self, **variables)
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214
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215 # write output
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216 output = output or sys.stdout
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217 if isinstance(output, basestring):
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218 path = output
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219 if os.path.isdir(output):
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220 path = os.path.join(path, basename(self.name))
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221 f = file(path, 'w')
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222 print >> f, content
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223 f.close()
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224 try:
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225 os.chmod(path, os.stat(self.name).st_mode)
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226 except:
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227 pass
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228 else:
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229 # file handler
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230 print >> output, content
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231
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232
34
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233 class DirectoryTemplate(ContentTemplate):
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234 """template for a directory structure"""
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235
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236 def __init__(self, directory, interactive=True, variables=None):
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237 """
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238 - output : output directory; if None will render in place
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239 """
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240 assert os.path.isdir(directory)
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241 self.name = directory
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242 self.interactive = interactive
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243 self.defaults = ContentTemplate.defaults.copy()
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244 self.defaults.update(variables or {})
34
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245
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246 def check_output(self, output):
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247 """
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248 checks output for validity
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249 """
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250 assert output # must provide output
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251 if os.path.exists(output):
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252 assert os.path.isdir(output), "%s: Must be a directory" % self.name
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253
34
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254 def missing(self, **variables):
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255 vars = self.defaults.copy()
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256 vars.update(variables)
34
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257 missing = set([])
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258 for dirpath, dirnames, filenames in os.walk(self.name):
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259
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260 # find variables from directory names
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261 for d in dirnames:
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262 missed = ContentTemplate(d).missing(**vars)
34
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263 missing.update(missed)
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264 variables.update(dict([(i, '') for i in missed]))
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265
34
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266 # find variables from files
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267 for f in filenames:
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268 missed = ContentTemplate(d).missing(**vars)
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269 missing.update(missed)
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270 variables.update(dict([(i, '') for i in missed]))
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271
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272 path = os.path.join(dirpath, f)
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273 template = URITemplate(path, interactive=self.interactive)
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274 missed = template.missing(**vars)
34
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275 missing.update(missed)
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276 variables.update(dict([(i, '') for i in missed]))
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277
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278 return missing
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279
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280 def substitute(self, variables, output):
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281 self.check_output(output)
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282 vars = self.get_variables(**variables)
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283 self.check_missing(vars)
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284
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285 # TODO: do this with recursion instead of os.walk so that
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286 # per-directory control may be asserted
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287
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288 # make output directory if necessary
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289 if output and not os.path.exists(output):
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290 os.makedirs(output)
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291
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292 for dirname, dirnames, filenames in os.walk(self.name):
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293
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294 # interpolate directory names
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295 for d in dirnames:
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296 path = os.path.join(dirname, d)
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297 interpolated = ContentTemplate(path).substitute(**vars)
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298 target = os.path.join(output, interpolated.split(self.name, 1)[-1].strip(os.path.sep))
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299
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300 if os.path.exists(target):
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301 # ensure its a directory
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302 # TODO: check this first before interpolation is in progress
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303 assert os.path.isdir(target), "Can't substitute a directory on top of the file"
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304 else:
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305 os.makedirs(target)
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306
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307 # interpolate files
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308 for filename in filenames:
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309
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310 # interpolate filenames
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311 path = os.path.join(dirname, filename)
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312 interpolated = ContentTemplate(path).substitute(**vars)
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313 target = os.path.join(output, interpolated.split(self.name, 1)[-1].strip(os.path.sep))
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314
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315 # interpolate their contents
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316 if os.path.exists(target):
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317 # ensure its a directory
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318 assert os.path.isfile(target), "Can't substitute a file on top of a directory"
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319 template = URITemplate(path, interactive=False)
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320 template.substitute(vars, target)
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321
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322
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323 class PolyTemplate(ContentTemplate):
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324 """template for several files/directories"""
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325
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326 def __init__(self, templates, interactive=True, variables=None):
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327
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328 self.interactive = interactive
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329 self.templates = []
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330 for template in templates:
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331 if isinstance(template, basestring):
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332 # TODO: check if the template is a [e.g] PasteScript.template entry point
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333 if os.path.isdir(template):
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334 self.templates.append(DirectoryTemplate(template, interactive=self.interactive, variables=variables))
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335 else:
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336 self.templates.append(URITemplate(template, interactive=self.interactive, variables=variables))
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337 else:
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338 # assume the template is an object that conforms to the API
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339 self.templates.append(template)
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340
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341 def missing(self, **variables):
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342 vars = variables.copy()
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343 missing = set([])
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344 for template in self.templates:
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345 missed = template.missing(**vars)
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346 missing.update(missed)
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347 vars.update(dict([(i, '') for i in missed]))
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348 return missing
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349
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350 def check_output(self, output):
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351 if output and isinstance(output, basestring) and os.path.exists(output) and len(self.templates) > 1:
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352 assert os.path.isdir(output), "Must specify a directory for multiple templates"
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353 for template in self.templates:
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354 if hasattr(template, 'check_output'):
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355 template.check_output(output)
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356
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357 def substitute(self, variables, output=None):
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358
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359 # determine where the hell to put these things
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360 self.check_output(output)
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361
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362 # get the variables
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363 vars = self.get_variables(**variables)
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364 self.check_missing(vars)
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365
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366 # make the output directory
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367 if output and len(self.templates) > 1 and not os.path.exists(output):
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368 os.makedirs(output)
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369
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370 # do the substitution
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371 for template in self.templates:
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372 template.substitute(vars, output)
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373
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374 ### command line interface
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375
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376 def read_config(config_files, templates=()):
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377 """read variables from a set of .ini files"""
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378 retval = {}
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379 parser = RawConfigParser()
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380 parser.read(config_files)
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381 retval.update(dict(parser.items('DEFAULT')))
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382 for template in templates:
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383 if template in parser.sections():
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384 retval.update(dict(parser.items(template)))
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385
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386 return retval
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387
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388 def invocation(url, **variables):
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389 """returns a string appropriate for TTW invocation"""
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390 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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391 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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392
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393 def main(args=sys.argv[1:]):
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394
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395 # create option parser
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396 usage = '%prog [options] template <template> <...>'
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397 parser = OptionParser(usage, description=__doc__)
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398
103
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399 # find dotfile
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400 dotfile = None
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401 if 'HOME' in os.environ:
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402 dotfile = os.path.join(os.environ['HOME'], '.makeitso')
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403 if not (os.path.exists(dotfile) and os.path.isfile(dotfile)):
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404 dotfile = None
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405
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406 # delimeters
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407 # XXX needs tempita trunk
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408 if has_delimeters:
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409 parser.add_option('-[', '--start-braces', dest='start_braces',
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410 help='starting delimeter')
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411 parser.add_option('-]', '--end-braces', dest='end_braces',
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412 help='starting delimeter')
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diff changeset
413
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diff changeset
414 # options about where to put things
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415 parser.add_option('-o', '--output', dest='output',
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diff changeset
416 help='where to put the output (filename or directory)')
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diff changeset
417
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diff changeset
418 # TODO
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419 # options for (.ini) variables
103
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420 parser.add_option('-c', '--config', dest='config',
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421 default=[], action='append',
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422 help='.ini config files to read variables from')
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423 if dotfile:
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424 parser.add_option('--no-defaults', dest='use_defaults',
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425 default=True, action='store_false',
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426 help="don't read ~/.makeitso")
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427
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428 # parser.add_option('-u', '--update', dest='update',
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429 # help="update the specified .ini file for variables read from this run")
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430 # parser.add_option('-U', '--Update', dest='Update',
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431 # help="same as -u, but update the global [DEFAULTS] section")
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432 # parser.add_option('--dry-run', dest='dry_run',
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433 # default=False, action='store_true',
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434 # help="don't actually do the substitution but do everything else")
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435
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diff changeset
436 # options for getting information
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437 parser.add_option('--commandline', dest='commandline',
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diff changeset
438 action='store_true', default=False,
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diff changeset
439 help="print the commandline to invoke this script TTW")
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440 parser.add_option('--variables', dest='variables',
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diff changeset
441 action='store_true', default=False,
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442 help='print the variables in a template')
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diff changeset
443
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444 options, args = parser.parse_args(args)
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445
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446 # print the variables for the templates
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447 if options.variables:
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448
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449 # makes no sense without a template
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450 if not args:
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451 parser.print_usage()
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452 parser.exit()
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453
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454 # find all variables
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455 template = PolyTemplate(templates=args)
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456 variables = template.variables()
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457
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458 # print them
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459 for variable in sorted(variables):
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460 print variable
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461 return
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462
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463 # template variables
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464 variables = {}
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465 _args = []
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466
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467 # read variables from configuration
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468 config_files = options.config
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469 if dotfile and options.use_defaults:
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470 config_files.insert(0, dotfile)
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471 if config_files:
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472 variables.update(read_config(config_files))
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473
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474 # override with variables from the command line
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475 _variables = {}
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476 for arg in args:
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477 if '=' in arg:
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478 key, value = arg.split('=')
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479 _variables[key] = value
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480 else:
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481 _args.append(arg)
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482 args = _args
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483 variables.update(_variables)
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484
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485 # print TTW commandline for invocation
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486 if options.commandline:
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487 if args:
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488 for arg in args:
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489 print invocation(arg, **variables)
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490 else:
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491 print invocation('[URI]', **variables)
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492 return
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493
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494
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495 # get the content
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496 if args:
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497 template = PolyTemplate(templates=args,
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498 variables=variables)
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499 template.substitute({}, output=options.output)
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500 else:
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501 template = ContentTemplate(sys.stdin.read(), variables=variables)
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502 print template.substitute()
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503
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504 # cleanup
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505 cleanup()
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506
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507 if __name__ == '__main__':
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508 main()