96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
"""
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thin wrapper around Python's optparse.py
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adding some extra checks and ways to systematically
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have Environment variables provide default values
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for options. basic usage:
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>>> parser = Parser()
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>>> parser.addoption("--hello", action="store_true", dest="hello")
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>>> option, args = parser.parse(['--hello'])
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>>> option.hello
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True
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>>> args
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[]
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"""
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import py
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from py.compat import optparse
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class Parser:
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""" Parser for command line arguments. """
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def __init__(self, usage=None, processopt=None):
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self._anonymous = OptionGroup("custom options", parser=self)
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self._groups = [self._anonymous]
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self._processopt = processopt
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self._usage = usage
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def processoption(self, option):
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if self._processopt:
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if option.dest:
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self._processopt(option)
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def addgroup(self, name, description=""):
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for group in self._groups:
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if group.name == name:
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raise ValueError("group %r already exists" % name)
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group = OptionGroup(name, description, parser=self)
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self._groups.append(group)
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return group
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def getgroup(self, name, description=""):
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for group in self._groups:
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if group.name == name:
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return group
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return self.addgroup(name, description)
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def addoption(self, *opts, **attrs):
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""" add an optparse-style option. """
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self._anonymous.addoption(*opts, **attrs)
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def parse(self, args):
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optparser = optparse.OptionParser(usage=self._usage)
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# make sure anaonymous group is at the end
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groups = self._groups[1:] + [self._groups[0]]
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for group in groups:
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if group.options:
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desc = group.description or group.name
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optgroup = optparse.OptionGroup(optparser, desc)
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optgroup.add_options(group.options)
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optparser.add_option_group(optgroup)
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return optparser.parse_args([str(x) for x in args])
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def parse_setoption(self, args, option):
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parsedoption, args = self.parse(args)
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for name, value in parsedoption.__dict__.items():
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setattr(option, name, value)
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return args
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class OptionGroup:
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def __init__(self, name, description="", parser=None):
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self.name = name
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self.description = description
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self.options = []
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self.parser = parser
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def addoption(self, *optnames, **attrs):
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""" add an option to this group. """
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option = py.compat.optparse.Option(*optnames, **attrs)
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self._addoption_instance(option, shortupper=False)
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def _addoption(self, *optnames, **attrs):
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option = py.compat.optparse.Option(*optnames, **attrs)
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self._addoption_instance(option, shortupper=True)
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def _addoption_instance(self, option, shortupper=False):
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if not shortupper:
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for opt in option._short_opts:
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if opt[0] == '-' and opt[1].islower():
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raise ValueError("lowercase shortoptions reserved")
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if self.parser:
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self.parser.processoption(option)
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self.options.append(option)
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