root/galaxy-central/eggs/bx_python-0.5.0_dev_f74aec067563-py2.6-macosx-10.6-universal-ucs2.egg/bx/cookbook/doc_optparse.py

リビジョン 3, 2.9 KB (コミッタ: kohda, 14 年 前)

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1"""
2:Author: M. Simionato
3:Date: April 2004
4:Title: A much simplified interface to optparse.
5
6You should use optionparse in your scripts as follows.
7First, write a module level docstring containing something like this
8(this is just an example)::
9
10    '''usage: %prog files [options]
11       -d, --delete: delete all files
12       -e, --erase = ERASE: erase the given file'''
13   
14Then write a main program of this kind:
15
16# sketch of a script to delete files::
17
18    if __name__=='__main__':
19        import optionparse
20        option,args=optionparse.parse(__doc__)
21        if not args and not option: optionparse.exit()
22        elif option.delete: print "Delete all files"
23        elif option.erase: print "Delete the given file"
24
25Notice that ``optionparse`` parses the docstring by looking at the
26characters ",", ":", "=", "\\n", so be careful in using them. If
27the docstring is not correctly formatted you will get a SyntaxError
28or worse, the script will not work as expected.
29"""
30
31import optparse, re, sys, traceback
32
33USAGE = re.compile(r'(?s)\s*usage: (.*?)(\n[ \t]*\n|$)')
34
35def nonzero(self): # will become the nonzero method of optparse.Values       
36    "True if options were given"
37    for v in self.__dict__.itervalues():
38        if v is not None: return True
39    return False
40
41optparse.Values.__nonzero__ = nonzero # dynamically fix optparse.Values
42
43class ParsingError(Exception): pass
44
45optionstring=""
46
47def exception(msg=""):
48    print >> sys.stderr, "Exception while parsing command line:"
49    print >>sys.stderr, traceback.format_exc()
50    exit( msg )
51
52def exit(msg=""):
53    raise SystemExit(msg or optionstring.replace("%prog",sys.argv[0]))
54
55def parse(docstring, arglist=None):
56    global optionstring
57    optionstring = docstring
58    match = USAGE.search(optionstring)
59    if not match: raise ParsingError("Cannot find the option string")
60    optlines = match.group(1).splitlines()
61    try:
62        p = optparse.OptionParser(optlines[0],conflict_handler="resolve")
63        for line in optlines[1:]:
64            opt, help=line.split(':')[:2]
65            # Make both short and long optional (but at least one)
66            ## Old: short,long=opt.split(',')[:2]
67            opt_strings = []
68            action = "store_true"
69            for k in opt.split( ', ' ):
70                k = k.strip()
71                if k.startswith( "--" ) and "=" in k:
72                    action = "store"
73                    k = k.split( "=" )[0]
74                opt_strings.append( k )
75            p.add_option( *opt_strings, **dict( action = action, help = help.strip() ) )
76        helpstring = docstring.replace("%prog",sys.argv[0])
77        # p.add_option( "-h", "--help", action="callback", callback=help_callback, callback_args=(helpstring,) )
78    except (IndexError,ValueError):
79        raise ParsingError("Cannot parse the option string correctly")
80    return p.parse_args(arglist)
81
82def help_callback( option, opt, value, parser, help ):
83    print >> sys.stderr, help
84    sys.exit( 1 )
85   
86   
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