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79 lines
2.3 KiB
79 lines
2.3 KiB
from __future__ import unicode_literals
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from prompt_toolkit.eventloop.context import TaskLocal, TaskLocalNotSetError
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from contextlib import contextmanager
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__all__ = [
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'get_app',
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'set_app',
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'NoRunningApplicationError',
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]
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_current_app = TaskLocal()
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def get_app(raise_exception=False, return_none=False):
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"""
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Get the current active (running) Application.
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An :class:`.Application` is active during the
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:meth:`.Application.run_async` call.
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We assume that there can only be one :class:`.Application` active at the
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same time. There is only one terminal window, with only one stdin and
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stdout. This makes the code significantly easier than passing around the
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:class:`.Application` everywhere.
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If no :class:`.Application` is running, then return by default a
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:class:`.DummyApplication`. For practical reasons, we prefer to not raise
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an exception. This way, we don't have to check all over the place whether
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an actual `Application` was returned.
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(For applications like pymux where we can have more than one `Application`,
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we'll use a work-around to handle that.)
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:param raise_exception: When `True`, raise
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:class:`.NoRunningApplicationError` instead of returning a
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:class:`.DummyApplication` if no application is running.
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:param return_none: When `True`, return `None`
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instead of returning a :class:`.DummyApplication` if no application is
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running.
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"""
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try:
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value = _current_app.get()
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except TaskLocalNotSetError:
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if raise_exception:
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raise NoRunningApplicationError
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elif return_none:
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return None
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else:
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from .dummy import DummyApplication
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return DummyApplication()
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else:
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return value
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@contextmanager
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def set_app(app):
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"""
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Context manager that sets the given :class:`.Application` active.
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(Usually, not needed to call outside of prompt_toolkit.)
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"""
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from .application import Application
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assert app is None or isinstance(app, Application)
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previous = get_app(return_none=True)
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_current_app.set(app)
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try:
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yield
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finally:
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if previous:
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_current_app.set(previous)
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else:
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_current_app.delete()
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class NoRunningApplicationError(Exception):
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" There is no active application right now. "
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