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#!/usr/bin/env python
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""" A minimal application using the Qt console-style IPython frontend.
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"""
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# Systemm library imports
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from PyQt4 import QtCore, QtGui
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# Local imports
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from IPython.external.argparse import ArgumentParser
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from IPython.frontend.qt.console.frontend_widget import FrontendWidget
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from IPython.frontend.qt.console.ipython_widget import IPythonWidget
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from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget
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from IPython.frontend.qt.kernelmanager import QtKernelManager
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# Constants
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LOCALHOST = '127.0.0.1'
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def main():
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""" Entry point for application.
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"""
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# Parse command line arguments.
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parser = ArgumentParser()
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parser.add_argument('-e', '--existing', action='store_true',
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help='connect to an existing kernel')
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parser.add_argument('--ip', type=str, default=LOCALHOST,
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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=0,
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help='set the XREQ channel port [default random]')
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parser.add_argument('--sub', type=int, metavar='PORT', default=0,
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help='set the SUB channel port [default random]')
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parser.add_argument('--rep', type=int, metavar='PORT', default=0,
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help='set the REP channel port [default random]')
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group = parser.add_mutually_exclusive_group()
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group.add_argument('--pure', action='store_true', help = \
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'use a pure Python kernel instead of an IPython kernel')
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group.add_argument('--pylab', action='store_true',
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help='use a kernel with PyLab enabled')
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parser.add_argument('--rich', action='store_true',
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help='use a rich text frontend')
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args = parser.parse_args()
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# Don't let Qt or ZMQ swallow KeyboardInterupts.
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import signal
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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# Create a KernelManager and start a kernel.
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kernel_manager = QtKernelManager(xreq_address=(args.ip, args.xreq),
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sub_address=(args.ip, args.sub),
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rep_address=(args.ip, args.rep))
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if args.ip == LOCALHOST and not args.existing:
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if args.pure:
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kernel_manager.start_kernel(ipython=False)
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elif args.pylab:
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if args.rich:
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kernel_manager.start_kernel(pylab='payload-svg')
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else:
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kernel_manager.start_kernel(pylab='qt4')
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else:
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kernel_manager.start_kernel()
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kernel_manager.start_channels()
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# Create the widget.
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app = QtGui.QApplication([])
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if args.pure:
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kind = 'rich' if args.rich else 'plain'
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widget = FrontendWidget(kind=kind)
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elif args.rich:
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widget = RichIPythonWidget()
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else:
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widget = IPythonWidget()
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widget.kernel_manager = kernel_manager
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widget.setWindowTitle('Python' if args.pure else 'IPython')
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widget.show()
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# FIXME: This is a hack: set colors to lightbg by default in qt terminal
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# unconditionally, regardless of user settings in config files.
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widget.execute("%colors lightbg", hidden=True)
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# Start the application main loop.
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app.exec_()
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if __name__ == '__main__':
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main()
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