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# System library imports
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from PyQt4 import QtCore, QtGui
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# Local imports
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from frontend_widget import FrontendWidget
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class IPythonWidget(FrontendWidget):
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""" A FrontendWidget for an IPython kernel.
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"""
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#---------------------------------------------------------------------------
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# 'FrontendWidget' interface
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#---------------------------------------------------------------------------
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def __init__(self, parent=None):
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super(IPythonWidget, self).__init__(parent)
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self._magic_overrides = {}
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def execute_source(self, source, hidden=False, interactive=False):
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""" Reimplemented to override magic commands.
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"""
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magic_source = source.strip()
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if magic_source.startswith('%'):
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magic_source = magic_source[1:]
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magic, sep, arguments = magic_source.partition(' ')
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if not magic:
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magic = magic_source
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callback = self._magic_overrides.get(magic)
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if callback:
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output = callback(arguments)
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if output:
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self.appendPlainText(output)
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self._show_prompt('>>> ')
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return True
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else:
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return super(IPythonWidget, self).execute_source(source, hidden,
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interactive)
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#---------------------------------------------------------------------------
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# 'IPythonWidget' interface
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#---------------------------------------------------------------------------
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def set_magic_override(self, magic, callback):
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""" Overrides an IPython magic command. This magic will be intercepted
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by the frontend rather than passed on to the kernel and 'callback'
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will be called with a single argument: a string of argument(s) for
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the magic. The callback can (optionally) return text to print to the
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console.
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"""
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self._magic_overrides[magic] = callback
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def remove_magic_override(self, magic):
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""" Removes the override for the specified magic, if there is one.
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"""
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try:
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del self._magic_overrides[magic]
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except KeyError:
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pass
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if __name__ == '__main__':
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from IPython.external.argparse import ArgumentParser
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from IPython.frontend.qt.kernelmanager import QtKernelManager
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# Don't let Qt swallow KeyboardInterupts.
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import signal
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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# Parse command line arguments.
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parser = ArgumentParser()
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parser.add_argument('--ip', type=str, default='127.0.0.1',
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help='set the kernel\'s IP address [default localhost]')
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parser.add_argument('--xreq', type=int, metavar='PORT', default=5575,
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help='set the XREQ Channel port [default %(default)i]')
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parser.add_argument('--sub', type=int, metavar='PORT', default=5576,
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help='set the SUB Channel port [default %(default)i]')
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namespace = parser.parse_args()
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# Create KernelManager
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ip = namespace.ip
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kernel_manager = QtKernelManager(xreq_address = (ip, namespace.xreq),
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sub_address = (ip, namespace.sub))
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kernel_manager.start_listening()
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# Launch application
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app = QtGui.QApplication([])
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widget = IPythonWidget()
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widget.kernel_manager = kernel_manager
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widget.setWindowTitle('Python')
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widget.resize(640, 480)
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widget.show()
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app.exec_()
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