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#-----------------------------------------------------------------------------

# Imports

#-----------------------------------------------------------------------------

import subprocess

import sys

from IPython.lib.kernel import connect_qtconsole

from IPython.kernel.zmq.ipkernel import IPKernelApp

#-----------------------------------------------------------------------------

# Functions and classes

#-----------------------------------------------------------------------------

def pylab_kernel(gui):

"""Launch and return an IPython kernel with pylab support for the desired gui

"""

kernel = IPKernelApp.instance()

kernel.initialize(['python', '--pylab=%s' % gui,

#'--log-level=10'

])

return kernel

class InternalIPKernel(object):

def init_ipkernel(self, backend):

# Start IPython kernel with GUI event loop and pylab support

self.ipkernel = pylab_kernel(backend)

# To create and track active qt consoles

self.consoles = []

# This application will also act on the shell user namespace

self.namespace = self.ipkernel.shell.user_ns

# Keys present at startup so we don't print the entire pylab/numpy

# namespace when the user clicks the 'namespace' button

self._init_keys = set(self.namespace.keys())

# Example: a variable that will be seen by the user in the shell, and

# that the GUI modifies (the 'Counter++' button increments it):

self.namespace['app_counter'] = 0

#self.namespace['ipkernel'] = self.ipkernel # dbg

def print_namespace(self, evt=None):

print("\n***Variables in User namespace***")

for k, v in self.namespace.iteritems():

if k not in self._init_keys and not k.startswith('_'):

print('%s -> %r' % (k, v))

sys.stdout.flush()

def new_qt_console(self, evt=None):

"""start a new qtconsole connected to our kernel"""

return connect_qtconsole(self.ipkernel.connection_file, profile=self.ipkernel.profile)

def count(self, evt=None):

self.namespace['app_counter'] += 1

def cleanup_consoles(self, evt=None):

for c in self.consoles:

c.kill()