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"""Application base class.
"""

import itertools
import logging
import logging.handlers
import shlex

import cmd2

LOG = logging.getLogger(__name__)


class InteractiveApp(cmd2.Cmd):
    """Provides "interactive mode" features.

    Refer to the cmd2_ and cmd_ documentation for details
    about subclassing and configuring this class.

    .. _cmd2: http://packages.python.org/cmd2/index.html
    .. _cmd: http://docs.python.org/library/cmd.html

    :param parent_app: The calling application (expected to be derived
                       from :class:`cliff.main.App`).
    :param command_manager: A :class:`cliff.commandmanager.CommandManager`
                            instance.
    :param stdin: Standard input stream
    :param stdout: Standard output stream
    """

    use_rawinput = True
    doc_header = "Shell commands (type help <topic>):"
    app_cmd_header = "Application commands (type help <topic>):"

    def __init__(self, parent_app, command_manager, stdin, stdout):
        self.parent_app = parent_app
        self.prompt = '(%s) ' % parent_app.NAME
        self.command_manager = command_manager
        cmd2.Cmd.__init__(self, 'tab', stdin=stdin, stdout=stdout)

    def default(self, line):
        # Tie in the default command processor to
        # dispatch commands known to the command manager.
        # We send the message through our parent app,
        # since it already has the logic for executing
        # the subcommand.
        line_parts = shlex.split(line.parsed.raw)
        self.parent_app.run_subcommand(line_parts)

    def completedefault(self, text, line, begidx, endidx):
        # Tab-completion for commands known to the command manager.
        # Does not handle options on the commands.
        if not text:
            completions = sorted(n for n, v in self.command_manager)
        else:
            completions = sorted(n for n, v in self.command_manager
                                 if n.startswith(text)
                                 )
        return completions

    def help_help(self):
        # Use the command manager to get instructions for "help"
        self.default('help help')

    def do_help(self, arg):
        if arg:
            # Check if the arg is a builtin command or something
            # coming from the command manager
            arg_parts = shlex.split(arg)
            method_name = '_'.join(
                itertools.chain(
                    ['do'],
                    itertools.takewhile(lambda x: not x.startswith('-'),
                                        arg_parts)
                )
            )
            # Have the command manager version of the help
            # command produce the help text since cmd and
            # cmd2 do not provide help for "help"
            if hasattr(self, method_name):
                return cmd2.Cmd.do_help(self, arg)
            # Dispatch to the underlying help command,
            # which knows how to provide help for extension
            # commands.
            self.default(self.parsed('help ' + arg))
        else:
            cmd2.Cmd.do_help(self, arg)
            cmd_names = sorted([n for n, v in self.command_manager])
            self.print_topics(self.app_cmd_header, cmd_names, 15, 80)
        return

    def get_names(self):
        # Override the base class version to filter out
        # things that look like they should be hidden
        # from the user.
        return [n
                for n in cmd2.Cmd.get_names(self)
                if not n.startswith('do__')
                ]

    def precmd(self, statement):
        # Pre-process the parsed command in case it looks like one of
        # our subcommands, since cmd2 does not handle multi-part
        # command names by default.
        line_parts = shlex.split(statement.parsed.raw)
        try:
            the_cmd = self.command_manager.find_command(line_parts)
            cmd_factory, cmd_name, sub_argv = the_cmd
        except ValueError:
            # Not a plugin command
            pass
        else:
            statement.parsed.command = cmd_name
            statement.parsed.args = ' '.join(sub_argv)
        return statement

    def cmdloop(self):
        self._cmdloop()