import os

from django.core.management.base import NoArgsCommand

from optparse import make_option

class Command(NoArgsCommand):

    option_list = NoArgsCommand.option_list + (

        make_option('--plain', action='store_true', dest='plain',

            help='Tells Django to use plain Python, not IPython.'),

    )

    help = "Runs a Python interactive interpreter. Tries to use IPython, if it's available."

    requires_model_validation = False

    def handle_noargs(self, **options):

        # XXX: (Temporary) workaround for ticket #1796: force early loading of all

        # models from installed apps.

        from django.db.models.loading import get_models

        loaded_models = get_models()

        use_plain = options.get('plain', False)

        try:

            if use_plain:

                # Don't bother loading IPython, because the user wants plain Python.

                raise ImportError

            import IPython

            # Explicitly pass an empty list as arguments, because otherwise IPython

            # would use sys.argv from this script.

            shell = IPython.Shell.IPShell(argv=[])

            shell.mainloop()

        except ImportError:

            import code

            # Set up a dictionary to serve as the environment for the shell, so

            # that tab completion works on objects that are imported at runtime.

            # See ticket 5082.

            imported_objects = {}

            try: # Try activating rlcompleter, because it's handy.

                import readline

            except ImportError:

                pass

            else:

                # We don't have to wrap the following import in a 'try', because

                # we already know 'readline' was imported successfully.

                import rlcompleter

                readline.set_completer(rlcompleter.Completer(imported_objects).complete)

                readline.parse_and_bind("tab:complete")

            # We want to honor both $PYTHONSTARTUP and .pythonrc.py, so follow system

            # conventions and get $PYTHONSTARTUP first then import user.

            if not use_plain: 

                pythonrc = os.environ.get("PYTHONSTARTUP") 

                if pythonrc and os.path.isfile(pythonrc): 

                    try: 

                        execfile(pythonrc) 

                    except NameError: 

                        pass

                # This will import .pythonrc.py as a side-effect

                import user

            code.interact(local=imported_objects)