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1 #!/usr/bin/env python
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2
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3 """
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4 program illustrating command line in the form of
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5 ``--option foo`` or ``--option=foo`` goes to a (key,value) paid
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6 and ``-tag`` gets appended to a list. Further options go to a further list::
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7
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8 >>> main(['-foo', '--bar=fleem', 'baz'])
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9 (['foo'], {'bar': 'fleem'}, ['baz'])
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10 """
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11
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12 import sys
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13
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14 class ParserError(Exception):
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15 """error for exceptions while parsing the command line"""
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16
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17 def main(_args=sys.argv[1:]):
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18
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19 # return values
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20 _dict = {}
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21 tags = []
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22 args = []
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23
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24 # parse the arguments
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25 key = None
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26 for arg in _args:
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27 if arg.startswith('---'):
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28 raise ParserError("arguments should start with '-' or '--' only")
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29 elif arg.startswith('--'):
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30 if key:
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31 raise ParserError("Key %s still open" % key)
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32 key = arg[2:]
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33 if '=' in key:
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34 key, value = key.split('=', 1)
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35 _dict[key] = value
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36 key = None
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37 continue
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38 elif arg.startswith('-'):
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39 if key:
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40 raise ParserError("Key %s still open" % key)
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41 tags.append(arg[1:])
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42 continue
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43 else:
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44 if key:
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45 _dict[key] = arg
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46 continue
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47 args.append(arg)
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48
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49 # return values
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50 return (_dict, tags, args)
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51
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52 if __name__ == '__main__':
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53 _dict, tags, args = main()
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54 print _dict
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55 print tags
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56 print args
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