from __future__ import absolute_import

​

from pip.basecommand import Command, SUCCESS

from pip.exceptions import CommandError

​

​

class HelpCommand(Command):

    """Show help for commands"""

    name = 'help'

    usage = """

      %prog <command>"""

    summary = 'Show help for commands.'

​

    def run(self, options, args):

        from pip.commands import commands_dict, 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 "%s"' % cmd_name]

            if guess:

                msg.append('maybe you meant "%s"' % guess)

​

            raise CommandError(' - '.join(msg))

​

        command = commands_dict[cmd_name]()

        command.parser.print_help()

​

        return SUCCESS

​