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annotate makeitso/makeitso.py @ 9:a77630b2b491

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* add commandline to print commandlines * add commandline option to print all variables
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 11 Nov 2010 18:19:44 -0800
parents ac78e26cd568
children a6fd93354f23
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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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12 from tempita import Template
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13
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14 # URL of this file
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15 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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16
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17 # regular expressions for finding the shebang
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18 shebang_re = '#!.*makeitso.*'
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19 shebang_re = re.compile(shebang_re)
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20
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21 class MissingVariablesException(Exception):
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22 def __init__(self, message, missing):
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23 self.missing = missing
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24
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25 def call(command, *args, **kw):
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26 code = subprocess.call(command, *args, **kw)
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27 if code:
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28 if isinstance(command, basestring):
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29 cmdstr = command
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30 else:
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31 cmdstr = ' '.join(command)
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32 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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33
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34 def get_missing(name_error):
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35 """
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36 This is a horrible hack because python doesn't do the proper thing
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37 via eval and return the name of the variable; instead, it just gives
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38 you a message:
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39 >>> try:
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40 ... eval('2*foo')
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41 ... except Exception, e:
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42 ... pass
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43 """
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44 message = name_error.args[0]
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45 varname = message.split("'")[1]
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46 return varname
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47
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48 def missing_variables(template, variables):
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49 """return additional variables needed"""
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50 vars = variables.copy()
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51 missing = set([])
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52 while True:
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53 try:
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54 template.substitute(**vars)
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55 return missing
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56 except NameError, e:
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57 missed = get_missing(e)
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58 missing.add(missed)
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59 vars[missed] = ''
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60 return missing
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61
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62 def template_variables(template):
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63 """return the variables needed for a template"""
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64 return missing_variables(template, {})
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65
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66 def read_variables(variables):
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67 retval = {}
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68 for i in variables:
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69 print 'Enter %s: ' % i,
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70 retval[i] = raw_input()
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71 return retval
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72
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73 def substitute(content, fp=sys.stdout, variables=None):
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74
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75 # remove makeitso shebang if it has one
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76 if shebang_re.match(content):
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77 content = os.linesep.join(content.splitlines()[1:])
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78
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79 variables = variables or {}
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80 template = Template(content)
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81 missing = missing_variables(template, variables)
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82 if missing:
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83 # TODO: add a switch for interactive or not
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84 variables.update(read_variables(missing))
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85 print >> fp, template.substitute(**variables)
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86
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87 def invocation(url, **variables):
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88 """returns a string appropriate for TTW invocation"""
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89 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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90 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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91
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92 def main(args=sys.argv[1:]):
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93
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94 # create option parser
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95 usage = '%prog [options] template <template> <...>'
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96 parser = OptionParser(usage, description=__doc__)
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97 parser.add_option('--commandline', dest='commandline',
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98 action='store_true', default=False,
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99 help="print the commandline to invoke this script TTW")
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100 parser.add_option('--variables', dest='variables',
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101 action='store_true', default=False,
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102 help='print the variables in a template')
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103 options, args = parser.parse_args(args)
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104
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105 # print the variables for the templates
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106 if options.variables:
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107
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108 # makes no sense without a template
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109 if not args:
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110 parser.print_usage()
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111 parser.exit()
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112
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113 # find all variables
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114 variables = set()
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115 for arg in args:
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116 content = file(arg).read()
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117 template = Template(content)
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118 variables.update(template_variables(template))
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119
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120 # print them
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121 for variable in variables:
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122 print variable
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123 return
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124
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125 # template variables
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126 variables = {}
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127 _vars = []
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128 _args = []
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129 for arg in args:
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130 if '=' in arg:
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131 key, value = arg.split('=')
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132 variables[key] = value
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133 else:
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134 _args.append(arg)
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135 args = _args
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136
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137 # print TTW commandline for invocation
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138 if options.commandline:
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139 if args:
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140 for arg in args:
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141 print invocation(arg, **variables)
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142 else:
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143 print invocation('[URL]', **variables)
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144 return
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145
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146 # get the content
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147 if args:
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148 for arg in args:
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149 content = file(arg).read()
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150 substitute(content, variables=variables)
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151 else:
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152 content = sys.stdin.read()
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153 substitute(content, variables=variables)
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154
f064be514e53 choose a better filename and remove some stuff from shebang
Jeff Hammel <jhammel@mozilla.com>
parents:
diff changeset
155 if __name__ == '__main__':
f064be514e53 choose a better filename and remove some stuff from shebang
Jeff Hammel <jhammel@mozilla.com>
parents:
diff changeset
156 main()