IPython/terminal/pt_inputhooks/gtk.py

# Code borrowed from python-prompt-toolkit examples
# https://github.com/jonathanslenders/python-prompt-toolkit/blob/77cdcfbc7f4b4c34a9d2f9a34d422d7152f16209/examples/inputhook.py

# Copyright (c) 2014, Jonathan Slenders
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"""
PyGTK input hook for prompt_toolkit.

Listens on the pipe prompt_toolkit sets up for a notification that it should
return control to the terminal event loop.
"""

import gtk, gobject

# Enable threading in GTK. (Otherwise, GTK will keep the GIL.)
gtk.gdk.threads_init()


def inputhook(context):
    """
    When the eventloop of prompt-toolkit is idle, call this inputhook.

    This will run the GTK main loop until the file descriptor
    `context.fileno()` becomes ready.

    :param context: An `InputHookContext` instance.
    """

    def _main_quit(*a, **kw):
        gtk.main_quit()
        return False

    gobject.io_add_watch(context.fileno(), gobject.IO_IN, _main_quit)
    gtk.main()