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comparison python/cli.py @ 107:1da1baa03ac1

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add a cli example program
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 29 Nov 2010 07:21:30 -0800
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children e7948549afa1
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106:3c193788a0db 107:1da1baa03ac1
1 #!/usr/bin/env python
2
3 """
4 program illustrating command line in the form of
5 ``--option foo`` or ``--option=foo`` goes to a (key,value) paid
6 and ``-tag`` gets appended to a list. Further options go to a further list::
7
8 >>> main(['-foo', '--bar=fleem', 'baz'])
9 (['foo'], {'bar': 'fleem'}, ['baz'])
10 """
11
12 import sys
13
14 class ParserError(Exception):
15 """error for exceptions while parsing the command line"""
16
17 def main(_args=sys.argv[1:]):
18
19 # return values
20 _dict = {}
21 tags = []
22 args = []
23
24 # parse the arguments
25 key = None
26 for arg in _args:
27 if arg.startswith('---'):
28 raise ParserError("arguments should start with '-' or '--' only")
29 elif arg.startswith('--'):
30 if key:
31 raise ParserError("Key %s still open" % key)
32 key = arg[2:]
33 if '=' in key:
34 key, value = key.split('=', 1)
35 _dict[key] = value
36 key = None
37 continue
38 elif arg.startswith('-'):
39 if key:
40 raise ParserError("Key %s still open" % key)
41 tags.append(arg[1:])
42 continue
43 else:
44 if key:
45 _dict[key] = arg
46 continue
47 args.append(arg)
48
49 # return values
50 return (_dict, tags, args)
51
52 if __name__ == '__main__':
53 _dict, tags, args = main()
54 print _dict
55 print tags
56 print args