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from __future__ import absolute_import, unicode_literals

import os
import sys
from collections import OrderedDict

from virtualenv.util.path import Path
from virtualenv.util.six import ensure_text

from ..via_template import ViaTemplateActivator


class PythonActivator(ViaTemplateActivator):
    def templates(self):
        yield Path("activate_this.py")

    def replacements(self, creator, dest_folder):
        replacements = super(PythonActivator, self).replacements(creator, dest_folder)
        lib_folders = OrderedDict((os.path.relpath(str(i), str(dest_folder)), None) for i in creator.libs)
        win_py2 = creator.interpreter.platform == "win32" and creator.interpreter.version_info.major == 2
        replacements.update(
            {
                "__LIB_FOLDERS__": ensure_text(os.pathsep.join(lib_folders.keys())),
                "__DECODE_PATH__": ("yes" if win_py2 else ""),
            },
        )
        return replacements

    @staticmethod
    def _repr_unicode(creator, value):
        py2 = creator.interpreter.version_info.major == 2
        if py2:  # on Python 2 we need to encode this into explicit utf-8, py3 supports unicode literals
            start = 2 if sys.version_info[0] == 3 else 1
            value = ensure_text(repr(value.encode("utf-8"))[start:-1])
        return value