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from __future__ import absolute_import, unicode_literals

import os
from abc import ABCMeta, abstractmethod

from six import add_metaclass


@add_metaclass(ABCMeta)
class Activator(object):
    """Generates an activate script for the virtual environment"""

    def __init__(self, options):
        """Create a new activator generator.

        :param options: the parsed options as defined within :meth:`add_parser_arguments`
        """
        self.flag_prompt = os.path.basename(os.getcwd()) if options.prompt == "." else options.prompt

    @classmethod
    def supports(cls, interpreter):
        """Check if the activation script is supported in the given interpreter.

        :param interpreter: the interpreter we need to support
        :return: ``True`` if supported, ``False`` otherwise
        """
        return True

    @classmethod
    def add_parser_arguments(cls, parser, interpreter):
        """
        Add CLI arguments for this activation script.

        :param parser: the CLI parser
        :param interpreter: the interpreter this virtual environment is based of
        """

    @abstractmethod
    def generate(self, creator):
        """Generate the activate script for the given creator.

        :param creator: the creator (based of :class:`virtualenv.create.creator.Creator`) we used to create this \
        virtual environment
        """
        raise NotImplementedError

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