import os

from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget
from IPython.frontend.qt.inprocess import QtInProcessKernelClient
from IPython.kernel.inprocess import InProcessKernelManager
from IPython.lib import guisupport


def print_process_id():
    print 'Process ID is:', os.getpid()


def main():
    # Print the ID of the main process
    print_process_id()

    app = guisupport.get_app_qt4()

    # Create an in-process kernel
    # >>> print_process_id()
    # will print the same process ID as the main process
    kernel_manager = InProcessKernelManager()
    kernel_manager.start_kernel()
    kernel = kernel_manager.kernel
    kernel.gui = 'qt4'
    kernel.shell.push({'foo': 43, 'print_process_id': print_process_id})

    kernel_client = QtInProcessKernelClient(kernel=kernel)
    kernel_client.start_channels()

    def stop():
        kernel_client.stop_channels()
        kernel_manager.shutdown_kernel()
        app.exit()

    control = RichIPythonWidget()
    control.kernel_manager = kernel_manager
    control.kernel_client = kernel_client
    control.exit_requested.connect(stop)
    control.show()

    guisupport.start_event_loop_qt4(app)


if __name__ == '__main__':
    main()