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"""
Package containing all pip commands
"""

# The following comment should be removed at some point in the future.
# mypy: disallow-untyped-defs=False

from __future__ import absolute_import

import importlib
from collections import OrderedDict, namedtuple

from pip._internal.utils.typing import MYPY_CHECK_RUNNING

if MYPY_CHECK_RUNNING:
    from typing import Any
    from pip._internal.cli.base_command import Command


CommandInfo = namedtuple('CommandInfo', 'module_path, class_name, summary')

# The ordering matters for help display.
#    Also, even though the module path starts with the same
# "pip._internal.commands" prefix in each case, we include the full path
# because it makes testing easier (specifically when modifying commands_dict
# in test setup / teardown by adding info for a FakeCommand class defined
# in a test-related module).
#    Finally, we need to pass an iterable of pairs here rather than a dict
# so that the ordering won't be lost when using Python 2.7.
commands_dict = OrderedDict([
    ('install', CommandInfo(
        'pip._internal.commands.install', 'InstallCommand',
        'Install packages.',
    )),
    ('download', CommandInfo(
        'pip._internal.commands.download', 'DownloadCommand',
        'Download packages.',
    )),
    ('uninstall', CommandInfo(
        'pip._internal.commands.uninstall', 'UninstallCommand',
        'Uninstall packages.',
    )),
    ('freeze', CommandInfo(
        'pip._internal.commands.freeze', 'FreezeCommand',
        'Output installed packages in requirements format.',
    )),
    ('list', CommandInfo(
        'pip._internal.commands.list', 'ListCommand',
        'List installed packages.',
    )),
    ('show', CommandInfo(
        'pip._internal.commands.show', 'ShowCommand',
        'Show information about installed packages.',
    )),
    ('check', CommandInfo(
        'pip._internal.commands.check', 'CheckCommand',
        'Verify installed packages have compatible dependencies.',
    )),
    ('config', CommandInfo(
        'pip._internal.commands.configuration', 'ConfigurationCommand',
        'Manage local and global configuration.',
    )),
    ('search', CommandInfo(
        'pip._internal.commands.search', 'SearchCommand',
        'Search PyPI for packages.',
    )),
    ('wheel', CommandInfo(
        'pip._internal.commands.wheel', 'WheelCommand',
        'Build wheels from your requirements.',
    )),
    ('hash', CommandInfo(
        'pip._internal.commands.hash', 'HashCommand',
        'Compute hashes of package archives.',
    )),
    ('completion', CommandInfo(
        'pip._internal.commands.completion', 'CompletionCommand',
        'A helper command used for command completion.',
    )),
    ('debug', CommandInfo(
        'pip._internal.commands.debug', 'DebugCommand',
        'Show information useful for debugging.',
    )),
    ('help', CommandInfo(
        'pip._internal.commands.help', 'HelpCommand',
        'Show help for commands.',
    )),
])  # type: OrderedDict[str, CommandInfo]


def create_command(name, **kwargs):
    # type: (str, **Any) -> Command
    """
    Create an instance of the Command class with the given name.
    """
    module_path, class_name, summary = commands_dict[name]
    module = importlib.import_module(module_path)
    command_class = getattr(module, class_name)
    command = command_class(name=name, summary=summary, **kwargs)

    return command


def get_similar_commands(name):
    """Command name auto-correct."""
    from difflib import get_close_matches

    name = name.lower()

    close_commands = get_close_matches(name, commands_dict.keys())

    if close_commands:
        return close_commands[0]
    else:
        return False