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115 lines
3.7 KiB
Python
115 lines
3.7 KiB
Python
"""distutils.fancy_getopt
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Wrapper around the standard getopt module that provides the following
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additional features:
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* short and long options are tied together
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* options have help strings, so fancy_getopt could potentially
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create a complete usage summary
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* options set attributes of a passed-in object
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"""
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# created 1999/03/03, Greg Ward
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__rcsid__ = "$Id$"
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import string, re
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from types import *
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import getopt
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from distutils.errors import *
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# Much like command_re in distutils.core, this is close to but not quite
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# the same as a Python NAME -- except, in the spirit of most GNU
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# utilities, we use '-' in place of '_'. (The spirit of LISP lives on!)
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# The similarities to NAME are again not a coincidence...
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longopt_re = re.compile (r'^[a-zA-Z]([a-zA-Z0-9-]*)$')
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# This is used to translate long options to legitimate Python identifiers
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# (for use as attributes of some object).
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longopt_xlate = string.maketrans ('-', '_')
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def fancy_getopt (options, object, args):
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# The 'options' table is a list of 3-tuples:
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# (long_option, short_option, help_string)
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# if an option takes an argument, its long_option should have '='
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# appended; short_option should just be a single character, no ':' in
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# any case. If a long_option doesn't have a corresponding
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# short_option, short_option should be None. All option tuples must
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# have long options.
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# Build the short_opts string and long_opts list, remembering how
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# the two are tied together
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short_opts = [] # we'll join 'em when done
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long_opts = []
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short2long = {}
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attr_name = {}
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takes_arg = {}
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for (long, short, help) in options:
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# Type-check the option names
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if type (long) is not StringType or len (long) < 2:
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raise DistutilsGetoptError, \
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"long option must be a string of length >= 2"
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if (not ((short is None) or
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(type (short) is StringType and len (short) == 1))):
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raise DistutilsGetoptError, \
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"short option must be None or string of length 1"
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long_opts.append (long)
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if long[-1] == '=': # option takes an argument?
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if short: short = short + ':'
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long = long[0:-1]
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takes_arg[long] = 1
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else:
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takes_arg[long] = 0
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# Now enforce some bondage on the long option name, so we can later
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# translate it to an attribute name in 'object'. Have to do this a
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# bit late to make sure we've removed any trailing '='.
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if not longopt_re.match (long):
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raise DistutilsGetoptError, \
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("invalid long option name '%s' " +
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"(must be letters, numbers, hyphens only") % long
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attr_name[long] = string.translate (long, longopt_xlate)
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if short:
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short_opts.append (short)
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short2long[short[0]] = long
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# end loop over 'options'
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short_opts = string.join (short_opts)
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try:
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(opts, args) = getopt.getopt (args, short_opts, long_opts)
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except getopt.error, msg:
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raise DistutilsArgError, msg
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for (opt, val) in opts:
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if len (opt) == 2 and opt[0] == '-': # it's a short option
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opt = short2long[opt[1]]
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elif len (opt) > 2 and opt[0:2] == '--':
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opt = opt[2:]
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else:
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raise RuntimeError, "getopt lies! (bad option string '%s')" % \
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opt
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attr = attr_name[opt]
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if takes_arg[opt]:
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setattr (object, attr, val)
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else:
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if val == '':
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setattr (object, attr, 1)
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else:
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raise RuntimeError, "getopt lies! (bad value '%s')" % value
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# end loop over options found in 'args'
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return args
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# end fancy_getopt()
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