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class Options:
instance = None
def __init__(self, options):
self.options = options
@classmethod
def set(cls, options):
"""Create an Options instance with the provided dictionary of
options"""
cls.instance = Options(options)
@classmethod
def inst(cls):
"""Get the Options instance.
"""
if cls.instance is None:
raise OptionsError("No options have been set")
return cls.instance
@classmethod
def get(cls, name, as_type=str):
"""Get an option by name.
Raises an OptionsError if the option doesn't exist.
"""
inst = cls.inst()
if name in inst.options:
return as_type(inst.options[name])
raise OptionsError("No option with key '%s'" % name)
@classmethod
def get_for_print(cls, name):
"""Get an option by name and for human readable output.
Raises an OptionsError if the option doesn't exist.
"""
option = cls.get(name)
if not option:
return "<empty>"
return option
@classmethod
def overwrite(cls, name, value):
inst = cls.inst()
inst.options[name] = value
@classmethod
def isset(cls, name):
"""Checks whether the option exists and is set.
By set, it means whether the option has length. All the option
values are strings.
"""
inst = cls.inst()
return name in inst.options and len(inst.options[name]) > 0
class OptionsError(Exception):
pass
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