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""" A view containing an interactive Python shell. """
# Standard library imports.
import logging
import traceback
# Major library imports
from IPython.kernel.core.interpreter import Interpreter
# Enthought library imports.
from enthought.envisage.api import IExtensionRegistry
from enthought.envisage.api import ExtensionPoint
from enthought.plugins.python_shell.api import IPythonShell
from enthought.plugins.ipython_shell.api import INamespaceView
from enthought.pyface.workbench.api import View
from enthought.pyface.ipython_widget import IPythonWidget
from enthought.pyface.api import GUI
from enthought.traits.api import Instance, Property, implements, Dict
# Setup a logger for this module.
logger = logging.getLogger(__name__)
class IPythonShellView(View):
""" A view containing an IPython shell. """
implements(IPythonShell)
#### 'IView' interface ####################################################
# The part's globally unique identifier.
id = 'enthought.plugins.python_shell_view'
# The part's name (displayed to the user).
name = 'IPython'
# The default position of the view relative to the item specified in the
# 'relative_to' trait.
position = 'bottom'
#### 'PythonShellView' interface ##########################################
# The interpreter's namespace.
namespace = Dict
# The names bound in the interpreter's namespace.
names = Property(depends_on="namespace")
#### 'IPythonShellView' interface #########################################
# The interpreter
interpreter = Instance(Interpreter)
def _interpreter_default(self):
# Create an interpreter that has a reference to our namespace.
return Interpreter(user_ns=self.namespace)
#### 'IExtensionPointUser' interface ######################################
# The extension registry that the object's extension points are stored in.
extension_registry = Property(Instance(IExtensionRegistry))
#### Private interface ####################################################
# Banner.
_banner = ExtensionPoint(id='enthought.plugins.ipython_shell.banner')
# Bindings.
_bindings = ExtensionPoint(id='enthought.plugins.python_shell.bindings')
# Commands.
_commands = ExtensionPoint(id='enthought.plugins.python_shell.commands')
###########################################################################
# 'IExtensionPointUser' interface.
###########################################################################
def _get_extension_registry(self):
""" Trait property getter. """
return self.window.application
###########################################################################
# 'View' interface.
###########################################################################
def create_control(self, parent):
""" Creates the toolkit-specific control that represents the view. """
self.shell = IPythonWidget(parent,
banner='\n'.join(self._banner),
interp=self.interpreter)
# Namespace contributions.
for bindings in self._bindings:
for name, value in bindings.items():
self.bind(name, value)
for command in self._commands:
try:
self.execute_command(command)
except Exception, e:
logger.exception(
"The command '%s' supplied to the Ipython shell "
"plugin has raised an exception:\n%s" %
(command, traceback.format_exc()))
# Register the view as a service.
self.window.application.register_service(IPythonShell, self)
ns_view = self.window.application.get_service(INamespaceView)
if ns_view is not None:
self.on_trait_change(ns_view._on_names_changed, 'names')
def try_set_focus():
try:
self.shell.control.SetFocus()
except:
# The window may not have been created yet.
pass
def set_focus():
self.window.application.gui.invoke_later(try_set_focus)
GUI.invoke_later(set_focus)
return self.shell.control
def destroy_control(self):
""" Destroys the toolkit-specific control that represents the view.
"""
super(IPythonShellView, self).destroy_control()
# Remove the namespace change handler
ns_view = self.window.application.get_service(INamespaceView)
if ns_view is not None:
self.on_trait_change(
ns_view._on_names_changed, 'names', remove=True
)
###########################################################################
# 'PythonShellView' interface.
###########################################################################
#### Properties ###########################################################
def _get_names(self):
""" Property getter. """
return self.control.ipython0.magic_who_ls()
#### Methods ##############################################################
def bind(self, name, value):
""" Binds a name to a value in the interpreter's namespace. """
self.namespace[name] = value
return
def execute_command(self, command, hidden=True):
""" Execute a command in the interpreter. """
self.shell.execute_command(command, hidden)
self.trait_property_changed('namespace', [], self.namespace)
def execute_file(self, path, hidden=True):
""" Execute a command in the interpreter. """
self.shell.execute_file(path, hidden)
self.trait_property_changed('namespace', [], self.namespace)
def lookup(self, name):
""" Returns the value bound to a name in the interpreter's namespace."""
return self.namespace[name]
#### EOF ######################################################################
|
