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annotate makeitso/makeitso.py @ 22:fc2867bc2ba6

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remove duplicated variable
author Jeff Hammel <jhammel@mozilla.com>
date Sun, 21 Nov 2010 12:59:47 -0800
parents c879b93c3f15
children 776805790c84
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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
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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 try:
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22 import tempita
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23 except ImportError:
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24
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25 # Get tempita from the net
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26 def getFiles(url, files):
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27 """
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28 fetch files from the internet
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29 - url : base url
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30 - files : list of files to retrieve
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31 returns the location of a temporary directory
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32 """
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33
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34 raise NotImplementedError
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36
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37 # regular expressions for finding the shebang
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38 shebang_re = '#!.*makeitso.*'
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39 shebang_re = re.compile(shebang_re)
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40
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41 class MissingVariablesException(Exception):
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42 def __init__(self, message, missing):
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43 self.missing = missing
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44
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45 def call(command, *args, **kw):
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46 code = subprocess.call(command, *args, **kw)
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47 if code:
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48 if isinstance(command, basestring):
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49 cmdstr = command
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50 else:
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51 cmdstr = ' '.join(command)
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52 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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53
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54 def get_missing(name_error):
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55 """
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56 This is a horrible hack because python doesn't do the proper thing
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57 via eval and return the name of the variable; instead, it just gives
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58 you a message:
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59 >>> try:
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60 ... eval('2*foo')
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61 ... except Exception, e:
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62 ... pass
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63 """
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64 message = name_error.args[0]
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65 varname = message.split("'")[1]
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66 return varname
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67
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68 def missing_variables(template, variables):
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69 """return additional variables needed"""
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70 vars = variables.copy()
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71 missing = set([])
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72 while True:
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73 try:
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74 template.substitute(**vars)
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75 return missing
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76 except NameError, e:
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77 missed = get_missing(e)
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78 missing.add(missed)
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79 vars[missed] = ''
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80 return missing
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81
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82 def template_variables(template):
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83 """return the variables needed for a template"""
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84 return missing_variables(template, {})
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85
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86 def read_variables(variables):
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87 retval = {}
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88 for i in variables:
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89 print 'Enter %s: ' % i,
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90 retval[i] = raw_input()
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91 return retval
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92
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93 def substitute(content, variables=None):
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94 """interactive (for now) substitution"""
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95
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96 # remove makeitso shebang if it has one
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97 if shebang_re.match(content):
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98 content = os.linesep.join(content.splitlines()[1:])
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99
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100 variables = variables or {}
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101 template = tempita.Template(content)
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102 missing = missing_variables(template, variables)
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103 if missing:
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104 # TODO: add a switch for interactive or not
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105 variables.update(read_variables(missing))
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106 return template.substitute(**variables)
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107
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108 def invocation(url, **variables):
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109 """returns a string appropriate for TTW invocation"""
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110 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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111 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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112
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113 def main(args=sys.argv[1:]):
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114
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115 # create option parser
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116 usage = '%prog [options] template <template> <...>'
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117 parser = OptionParser(usage, description=__doc__)
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118 parser.add_option('-[', '--start-braces', dest='start_braces',
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119 help='starting delimeter')
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120 parser.add_option('-]', '--end-braces', dest='end_braces',
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121 help='starting delimeter')
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122 parser.add_option('--in-place', dest='in_place',
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123 action='store_true', default=False,
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124 help='interpret files in place') # TODO: unused
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125 parser.add_option('--commandline', dest='commandline',
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126 action='store_true', default=False,
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127 help="print the commandline to invoke this script TTW")
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128 parser.add_option('--variables', dest='variables',
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129 action='store_true', default=False,
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130 help='print the variables in a template')
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131 options, args = parser.parse_args(args)
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132
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133 # print the variables for the templates
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134 if options.variables:
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135
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136 # makes no sense without a template
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137 if not args:
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138 parser.print_usage()
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139 parser.exit()
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140
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141 # find all variables
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142 variables = set()
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143 for arg in args:
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144 content = file(arg).read()
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145 template = tempita.Template(content)
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146 variables.update(template_variables(template))
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147
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148 # print them
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149 for variable in variables:
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150 print variable
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151 return
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152
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153 # template variables
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154 variables = {}
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155 _vars = []
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156 _args = []
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157 for arg in args:
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158 if '=' in arg:
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159 key, value = arg.split('=')
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160 variables[key] = value
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161 else:
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162 _args.append(arg)
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163 args = _args
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164
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165 # print TTW commandline for invocation
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166 if options.commandline:
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167 if args:
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168 for arg in args:
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169 print invocation(arg, **variables)
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170 else:
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171 print invocation('[URL]', **variables)
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172 return
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173
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174 # get the content
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175 if args:
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176 for arg in args:
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177 f, headers = urllib.urlretrieve(arg)
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178 content = file(f).read()
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179 print substitute(content, variables=variables)
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180 else:
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181 content = sys.stdin.read()
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182 print substitute(content, variables=variables)
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183
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184 if __name__ == '__main__':
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185 main()