98 lines
3.7 KiB
Python
98 lines
3.7 KiB
Python
import os
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import select
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import sys
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from django.core.management import BaseCommand, CommandError
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from django.utils.datastructures import OrderedSet
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class Command(BaseCommand):
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help = (
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"Runs a Python interactive interpreter. Tries to use IPython or "
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"bpython, if one of them is available. Any standard input is executed "
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"as code."
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)
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requires_system_checks = False
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shells = ['ipython', 'bpython', 'python']
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def add_arguments(self, parser):
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parser.add_argument(
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'--no-startup', action='store_true', dest='no_startup',
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help='When using plain Python, ignore the PYTHONSTARTUP environment variable and ~/.pythonrc.py script.',
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)
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parser.add_argument(
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'-i', '--interface', choices=self.shells, dest='interface',
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help='Specify an interactive interpreter interface. Available options: "ipython", "bpython", and "python"',
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)
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parser.add_argument(
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'-c', '--command', dest='command',
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help='Instead of opening an interactive shell, run a command as Django and exit.',
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)
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def ipython(self, options):
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from IPython import start_ipython
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start_ipython(argv=[])
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def bpython(self, options):
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import bpython
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bpython.embed()
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def python(self, options):
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import code
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# Set up a dictionary to serve as the environment for the shell, so
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# that tab completion works on objects that are imported at runtime.
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imported_objects = {}
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try: # Try activating rlcompleter, because it's handy.
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import readline
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except ImportError:
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pass
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else:
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# We don't have to wrap the following import in a 'try', because
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# we already know 'readline' was imported successfully.
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import rlcompleter
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readline.set_completer(rlcompleter.Completer(imported_objects).complete)
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# Enable tab completion on systems using libedit (e.g. Mac OSX).
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# These lines are copied from Python's Lib/site.py.
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readline_doc = getattr(readline, '__doc__', '')
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if readline_doc is not None and 'libedit' in readline_doc:
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readline.parse_and_bind("bind ^I rl_complete")
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else:
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readline.parse_and_bind("tab:complete")
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# We want to honor both $PYTHONSTARTUP and .pythonrc.py, so follow system
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# conventions and get $PYTHONSTARTUP first then .pythonrc.py.
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if not options['no_startup']:
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for pythonrc in OrderedSet([os.environ.get("PYTHONSTARTUP"), os.path.expanduser('~/.pythonrc.py')]):
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if not pythonrc:
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continue
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if not os.path.isfile(pythonrc):
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continue
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try:
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with open(pythonrc) as handle:
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exec(compile(handle.read(), pythonrc, 'exec'), imported_objects)
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except NameError:
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pass
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code.interact(local=imported_objects)
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def handle(self, **options):
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# Execute the command and exit.
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if options['command']:
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exec(options['command'])
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return
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# Execute stdin if it has anything to read and exit.
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# Not supported on Windows due to select.select() limitations.
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if sys.platform != 'win32' and select.select([sys.stdin], [], [], 0)[0]:
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exec(sys.stdin.read())
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return
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available_shells = [options['interface']] if options['interface'] else self.shells
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for shell in available_shells:
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try:
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return getattr(self, shell)(options)
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except ImportError:
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pass
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raise CommandError("Couldn't import {} interface.".format(shell))
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