113 lines
3.5 KiB
Python
113 lines
3.5 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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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 = []
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self._processopt = processopt
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self._usage = usage
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self.hints = []
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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 addnote(self, note):
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self._notes.append(note)
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def getgroup(self, name, description="", after=None):
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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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group = OptionGroup(name, description, parser=self)
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i = 0
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for i, grp in enumerate(self._groups):
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if grp.name == after:
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break
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self._groups.insert(i+1, group)
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return group
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addgroup = getgroup
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def addgroup(self, name, description=""):
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py.log._apiwarn("1.1", "use getgroup() which gets-or-creates")
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return self.getgroup(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 = MyOptionParser(self)
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groups = self._groups + [self._anonymous]
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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 = 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 = 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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class MyOptionParser(optparse.OptionParser):
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def __init__(self, parser):
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self._parser = parser
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optparse.OptionParser.__init__(self, usage=parser._usage)
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def format_epilog(self, formatter):
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hints = self._parser.hints
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if hints:
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s = "\n".join(["hint: " + x for x in hints]) + "\n"
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s = "\n" + s + "\n"
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return s
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return ""
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