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from __future__ import absolute_import
from pip._internal.cli.base_command import Command
from pip._internal.cli.status_codes import SUCCESS
from pip._internal.exceptions import CommandError
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
if MYPY_CHECK_RUNNING:
from typing import List
from optparse import Values
class HelpCommand(Command):
"""Show help for commands"""
usage = """
%prog <command>"""
ignore_require_venv = True
def run(self, options, args):
# type: (Values, List[str]) -> int
from pip._internal.commands import (
commands_dict, create_command, get_similar_commands,
)
try:
# 'pip help' with no args is handled by pip.__init__.parseopt()
cmd_name = args[0] # the command we need help for
except IndexError:
return SUCCESS
if cmd_name not in commands_dict:
guess = get_similar_commands(cmd_name)
msg = ['unknown command "{}"'.format(cmd_name)]
if guess:
msg.append('maybe you meant "{}"'.format(guess))
raise CommandError(' - '.join(msg))
command = create_command(cmd_name)
command.parser.print_help()
return SUCCESS