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annotate makeitso/makeitso.py @ 12:a6fd93354f23

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add options for starting and ending braces (unused)
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 15 Nov 2010 07:55:45 -0800
parents a77630b2b491
children 99588f138993
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python
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2 """
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3 filesystem template interpreter
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4 """
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5
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6 import os
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7 import re
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8 import subprocess
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9 import sys
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10
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11 from optparse import OptionParser
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13
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14 try:
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15 import tempita
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16 except ImportError:
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17 raise NotImplementedError
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18
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19 # URL of this file
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20 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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21
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22 # regular expressions for finding the shebang
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23 shebang_re = '#!.*makeitso.*'
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24 shebang_re = re.compile(shebang_re)
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25
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26 class MissingVariablesException(Exception):
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27 def __init__(self, message, missing):
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28 self.missing = missing
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29
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30 def call(command, *args, **kw):
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31 code = subprocess.call(command, *args, **kw)
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32 if code:
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33 if isinstance(command, basestring):
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34 cmdstr = command
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35 else:
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36 cmdstr = ' '.join(command)
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37 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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38
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39 def get_missing(name_error):
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40 """
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41 This is a horrible hack because python doesn't do the proper thing
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42 via eval and return the name of the variable; instead, it just gives
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43 you a message:
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44 >>> try:
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45 ... eval('2*foo')
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46 ... except Exception, e:
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47 ... pass
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48 """
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49 message = name_error.args[0]
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50 varname = message.split("'")[1]
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51 return varname
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52
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53 def missing_variables(template, variables):
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54 """return additional variables needed"""
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55 vars = variables.copy()
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56 missing = set([])
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57 while True:
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58 try:
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59 template.substitute(**vars)
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60 return missing
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61 except NameError, e:
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62 missed = get_missing(e)
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63 missing.add(missed)
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64 vars[missed] = ''
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65 return missing
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66
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67 def template_variables(template):
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68 """return the variables needed for a template"""
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69 return missing_variables(template, {})
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70
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71 def read_variables(variables):
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72 retval = {}
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73 for i in variables:
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74 print 'Enter %s: ' % i,
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75 retval[i] = raw_input()
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76 return retval
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77
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78 def substitute(content, fp=sys.stdout, variables=None):
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79
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80 # remove makeitso shebang if it has one
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81 if shebang_re.match(content):
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82 content = os.linesep.join(content.splitlines()[1:])
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83
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84 variables = variables or {}
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85 template = Template(content)
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86 missing = missing_variables(template, variables)
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87 if missing:
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88 # TODO: add a switch for interactive or not
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89 variables.update(read_variables(missing))
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90 print >> fp, template.substitute(**variables)
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91
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92 def invocation(url, **variables):
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93 """returns a string appropriate for TTW invocation"""
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94 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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95 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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96
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97 def main(args=sys.argv[1:]):
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98
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99 # create option parser
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100 usage = '%prog [options] template <template> <...>'
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101 parser = OptionParser(usage, description=__doc__)
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102 parser.add_option('-[', '--start-braces', dest='start_braces',
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103 help='starting delimeter')
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104 parser.add_option('-]', '--end-braces', dest='end_braces',
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105 help='starting delimeter')
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106 parser.add_option('--commandline', dest='commandline',
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107 action='store_true', default=False,
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108 help="print the commandline to invoke this script TTW")
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109 parser.add_option('--variables', dest='variables',
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110 action='store_true', default=False,
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111 help='print the variables in a template')
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112 options, args = parser.parse_args(args)
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113
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114 # print the variables for the templates
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115 if options.variables:
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116
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117 # makes no sense without a template
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118 if not args:
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119 parser.print_usage()
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120 parser.exit()
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121
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122 # find all variables
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123 variables = set()
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124 for arg in args:
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125 content = file(arg).read()
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126 template = Template(content)
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127 variables.update(template_variables(template))
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128
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129 # print them
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130 for variable in variables:
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131 print variable
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132 return
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133
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134 # template variables
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135 variables = {}
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136 _vars = []
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137 _args = []
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138 for arg in args:
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139 if '=' in arg:
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140 key, value = arg.split('=')
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141 variables[key] = value
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142 else:
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143 _args.append(arg)
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144 args = _args
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145
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146 # print TTW commandline for invocation
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147 if options.commandline:
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148 if args:
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149 for arg in args:
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150 print invocation(arg, **variables)
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151 else:
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152 print invocation('[URL]', **variables)
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153 return
a77630b2b491 * add commandline to print commandlines
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154
5
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155 # get the content
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156 if args:
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157 for arg in args:
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158 content = file(arg).read()
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159 substitute(content, variables=variables)
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160 else:
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161 content = sys.stdin.read()
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162 substitute(content, variables=variables)
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163
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164 if __name__ == '__main__':
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165 main()