annotate makeitso/main.py @ 3:8931be6d2c8a

stub for getting missing variables
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 04 Nov 2010 19:12:56 -0700
parents 825922315ce6
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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 subprocess
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8 import sys
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9
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10 from optparse import OptionParser
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11 from tempita import Template
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12
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13 def call(command, *args, **kw):
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14 code = subprocess.call(command, *args, **kw)
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15 if code:
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16 if isinstance(command, basestring):
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17 cmdstr = command
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18 else:
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19 cmdstr = ' '.join(command)
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20 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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21
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22 def get_missing(name_error):
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23 """
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24 This is a horrible hack because python doesn't do the proper thing
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25 via eval and return the name of the variable; instead, it just gives
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26 you a message:
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27 >>> try:
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28 ... eval('2*foo')
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29 ... except Exception, e:
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30 ... pass
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31 """
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32 message = name_error.args[0]
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33 varname = message.split("'")[1]
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34 return varname
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35
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36 def missing_variables(template, variables):
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37 """return additional variables needed"""
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38 vars = variables.copy()
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39 missing = set([])
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40 while True:
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41 try:
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42 template.substitute(**missing)
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43 return missing
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44 except NameError, e:
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45 missed = get_missing(e)
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46 missing.add(missed)
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47 vars[missed] = ''
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48
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49 def template_variables(template):
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50 """return the variables needed for a template"""
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51 return missing_variables(template, {})
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52
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53 def main(args=sys.argv[1:]):
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54
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55 # create option parser
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56 usage = '%prog [options]'
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57 parser = OptionParser(usage, description=__doc__)
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58 parser.add_option('--variables', dest='variables', action='store_true',
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59 help='print the variables in a template')
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60 options, args = parser.parse_args(args)
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61
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62 if options.variables:
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63 variables = template_variables() # TODO: pass template
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64 return
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65
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66 # template variables
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67 variables = {}
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68 _vars = []
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69 _args = []
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70 for arg in args:
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71 if '=' in arg:
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72 key, value = arg.split('=')
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73 variables[key] = value
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74 else:
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75 _args.append(arg)
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76 args = _args
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77
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78 # get the content
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79 if args:
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80 for arg in args:
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81 content = file(arg).read()
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82 template = Template(content)
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83 print template.substitute(**variables)
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84 else:
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85 content = sys.stdin.read()
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86 template = Template(content)
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87 print template.substitute(**variables)
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88
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89 if __name__ == '__main__':
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90 main()