command-line pass

* profile create does *not* include redundant '--init', inherited from parent app
* --init message more verbose
* include aliases in items scrubbed from the argv passed to the kernel from the frontend, now that unrecognized aliases throw a warning
* remove plain/pure as aliases, leaving only bool flags
* make <engine|controller>_launcher_class help message more verbose, including example values
* engines inherit work_dir from launching ipcluster by default, rather than using profile_dir
* unimportable launcher classes won't cause a crash in ipcluster

IPython/core/application.py

@@ -1,307 +1,309 b''
 # encoding: utf-8
 """
 An application for IPython.
 
 All top-level applications should use the classes in this module for
 handling configuration and creating componenets.
 
 The job of an :class:`Application` is to create the master configuration 
 object and then create the configurable objects, passing the config to them.
 
 Authors:
 
 * Brian Granger
 * Fernando Perez
 * Min RK
 
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import glob
 import logging
 import os
 import shutil
 import sys
 
 from IPython.config.application import Application
 from IPython.config.configurable import Configurable
 from IPython.config.loader import Config
 from IPython.core import release, crashhandler
 from IPython.core.profiledir import ProfileDir, ProfileDirError
 from IPython.utils.path import get_ipython_dir, get_ipython_package_dir
 from IPython.utils.traitlets import List, Unicode, Type, Bool, Dict
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 
 #-----------------------------------------------------------------------------
 # Base Application Class
 #-----------------------------------------------------------------------------
 
 # aliases and flags
 
 base_aliases = {
     'profile' : 'BaseIPythonApplication.profile',
     'ipython-dir' : 'BaseIPythonApplication.ipython_dir',
     'log-level' : 'Application.log_level',
 }
 
 base_flags = dict(
     debug = ({'Application' : {'log_level' : logging.DEBUG}},
             "set log level to logging.DEBUG (maximize logging output)"),
     quiet = ({'Application' : {'log_level' : logging.CRITICAL}},
             "set log level to logging.CRITICAL (minimize logging output)"),
     init = ({'BaseIPythonApplication' : {
                     'copy_config_files' : True,
                     'auto_create' : True}
-            }, "Initialize profile with default config files")
+            }, """Initialize profile with default config files.  This is equivalent
+            to running `ipython profile create <profile>` prior to startup.
+            """)
 )
 
 
 class BaseIPythonApplication(Application):
 
     name = Unicode(u'ipython')
     description = Unicode(u'IPython: an enhanced interactive Python shell.')
     version = Unicode(release.version)
     
     aliases = Dict(base_aliases)
     flags = Dict(base_flags)
     classes = List([ProfileDir])
     
     # Track whether the config_file has changed,
     # because some logic happens only if we aren't using the default.
     config_file_specified = Bool(False)
     
     config_file_name = Unicode(u'ipython_config.py')
     def _config_file_name_default(self):
         return self.name.replace('-','_') + u'_config.py'
     def _config_file_name_changed(self, name, old, new):
         if new != old:
             self.config_file_specified = True
 
     # The directory that contains IPython's builtin profiles.
     builtin_profile_dir = Unicode(
         os.path.join(get_ipython_package_dir(), u'config', u'profile', u'default')
     )
 
     config_file_paths = List(Unicode)
     def _config_file_paths_default(self):
         return [os.getcwdu()]
 
     profile = Unicode(u'default', config=True,
         help="""The IPython profile to use."""
     )
     def _profile_changed(self, name, old, new):
         self.builtin_profile_dir = os.path.join(
                 get_ipython_package_dir(), u'config', u'profile', new
         )
     
     ipython_dir = Unicode(get_ipython_dir(), config=True, 
         help="""
         The name of the IPython directory. This directory is used for logging
         configuration (through profiles), history storage, etc. The default
         is usually $HOME/.ipython. This options can also be specified through
         the environment variable IPYTHON_DIR.
         """
     )
     
     overwrite = Bool(False, config=True,
         help="""Whether to overwrite existing config files when copying""")
     auto_create = Bool(False, config=True,
         help="""Whether to create profile dir if it doesn't exist""")
     
     config_files = List(Unicode)
     def _config_files_default(self):
         return [u'ipython_config.py']
     
     copy_config_files = Bool(False, config=True,
         help="""Whether to install the default config files into the profile dir.
         If a new profile is being created, and IPython contains config files for that
         profile, then they will be staged into the new directory.  Otherwise,
         default config files will be automatically generated.
         """)
 
     # The class to use as the crash handler.
     crash_handler_class = Type(crashhandler.CrashHandler)
 
     def __init__(self, **kwargs):
         super(BaseIPythonApplication, self).__init__(**kwargs)
         # ensure even default IPYTHON_DIR exists
         if not os.path.exists(self.ipython_dir):
             self._ipython_dir_changed('ipython_dir', self.ipython_dir, self.ipython_dir)
     
     #-------------------------------------------------------------------------
     # Various stages of Application creation
     #-------------------------------------------------------------------------
 
     def init_crash_handler(self):
         """Create a crash handler, typically setting sys.excepthook to it."""
         self.crash_handler = self.crash_handler_class(self)
         sys.excepthook = self.crash_handler
 
     def _ipython_dir_changed(self, name, old, new):
         if old in sys.path:
             sys.path.remove(old)
         sys.path.append(os.path.abspath(new))
         if not os.path.isdir(new):
             os.makedirs(new, mode=0777)
         readme = os.path.join(new, 'README')
         if not os.path.exists(readme):
             path = os.path.join(get_ipython_package_dir(), u'config', u'profile')
             shutil.copy(os.path.join(path, 'README'), readme)
         self.log.debug("IPYTHON_DIR set to: %s" % new)
 
     def load_config_file(self, suppress_errors=True):
         """Load the config file.
 
         By default, errors in loading config are handled, and a warning
         printed on screen. For testing, the suppress_errors option is set
         to False, so errors will make tests fail.
         """
         base_config = 'ipython_config.py'
         self.log.debug("Attempting to load config file: %s" %
                        base_config)
         try:
             Application.load_config_file(
                 self,
                 base_config, 
                 path=self.config_file_paths
             )
         except IOError:
             # ignore errors loading parent
             pass
         if self.config_file_name == base_config:
             # don't load secondary config
             return
         self.log.debug("Attempting to load config file: %s" %
                        self.config_file_name)
         try:
             Application.load_config_file(
                 self,
                 self.config_file_name, 
                 path=self.config_file_paths
             )
         except IOError:
             # Only warn if the default config file was NOT being used.
             if self.config_file_specified:
                 self.log.warn("Config file not found, skipping: %s" %
                                self.config_file_name)
         except:
             # For testing purposes.
             if not suppress_errors:
                 raise
             self.log.warn("Error loading config file: %s" %
                           self.config_file_name, exc_info=True)
 
     def init_profile_dir(self):
         """initialize the profile dir"""
         try:
             # location explicitly specified:
             location = self.config.ProfileDir.location
         except AttributeError:
             # location not specified, find by profile name
             try:
                 p = ProfileDir.find_profile_dir_by_name(self.ipython_dir, self.profile, self.config)
             except ProfileDirError:
                 # not found, maybe create it (always create default profile)
                 if self.auto_create or self.profile=='default':
                     try:
                         p = ProfileDir.create_profile_dir_by_name(self.ipython_dir, self.profile, self.config)
                     except ProfileDirError:
                         self.log.fatal("Could not create profile: %r"%self.profile)
                         self.exit(1)
                     else:
                         self.log.info("Created profile dir: %r"%p.location)
                 else:
                     self.log.fatal("Profile %r not found."%self.profile)
                     self.exit(1)
             else:
                 self.log.info("Using existing profile dir: %r"%p.location)
         else:
             # location is fully specified
             try:
                 p = ProfileDir.find_profile_dir(location, self.config)
             except ProfileDirError:
                 # not found, maybe create it
                 if self.auto_create:
                     try:
                         p = ProfileDir.create_profile_dir(location, self.config)
                     except ProfileDirError:
                         self.log.fatal("Could not create profile directory: %r"%location)
                         self.exit(1)
                     else:
                         self.log.info("Creating new profile dir: %r"%location)
                 else:
                     self.log.fatal("Profile directory %r not found."%location)
                     self.exit(1)
             else:
                 self.log.info("Using existing profile dir: %r"%location)
         
         self.profile_dir = p
         self.config_file_paths.append(p.location)
     
     def init_config_files(self):
         """[optionally] copy default config files into profile dir."""
         # copy config files
         path = self.builtin_profile_dir
         if self.copy_config_files:
             src = self.profile
             
             cfg = self.config_file_name
             if path and os.path.exists(os.path.join(path, cfg)):
                 self.log.warn("Staging %r from %s into %r [overwrite=%s]"%(
                         cfg, src, self.profile_dir.location, self.overwrite)
                 )
                 self.profile_dir.copy_config_file(cfg, path=path, overwrite=self.overwrite)
             else:
                 self.stage_default_config_file()
         else:
             # Still stage *bundled* config files, but not generated ones
             # This is necessary for `ipython profile=sympy` to load the profile
             # on the first go
             files = glob.glob(os.path.join(path, '*.py'))
             for fullpath in files:
                 cfg = os.path.basename(fullpath)
                 if self.profile_dir.copy_config_file(cfg, path=path, overwrite=False):
                     # file was copied
                     self.log.warn("Staging bundled %s from %s into %r"%(
                             cfg, self.profile, self.profile_dir.location)
                     )
             
     
     def stage_default_config_file(self):
         """auto generate default config file, and stage it into the profile."""
         s = self.generate_config_file()
         fname = os.path.join(self.profile_dir.location, self.config_file_name)
         if self.overwrite or not os.path.exists(fname):
             self.log.warn("Generating default config file: %r"%(fname))
             with open(fname, 'w') as f:
                 f.write(s)
         
     
     def initialize(self, argv=None):
         # don't hook up crash handler before parsing command-line
         self.parse_command_line(argv)
         self.init_crash_handler()
         if self.subapp is not None:
             # stop here if subapp is taking over
             return
         cl_config = self.config
         self.init_profile_dir()
         self.init_config_files()
         self.load_config_file()
         # enforce cl-opts override configfile opts:
         self.update_config(cl_config)
 

IPython/core/profileapp.py

@@ -1,238 +1,240 b''
 # encoding: utf-8
 """
 An application for managing IPython profiles.
 
 To be invoked as the `ipython profile` subcommand.
 
 Authors:
 
 * Min RK
 
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import logging
 import os
 
 from IPython.config.application import Application, boolean_flag
 from IPython.core.application import (
     BaseIPythonApplication, base_flags, base_aliases
 )
 from IPython.core.profiledir import ProfileDir
 from IPython.utils.path import get_ipython_dir
 from IPython.utils.traitlets import Unicode, Bool, Dict
 
 #-----------------------------------------------------------------------------
 # Constants
 #-----------------------------------------------------------------------------
 
 create_help = """Create an IPython profile by name
 
 Create an ipython profile directory by its name or
 profile directory path. Profile directories contain
 configuration, log and security related files and are named
 using the convention 'profile_<name>'. By default they are
 located in your ipython directory. Once created, you will
 can edit the configuration files in the profile
 directory to configure IPython. Most users will create a
 profile directory by name,
 `ipython profile create myprofile`, which will put the directory
 in `<ipython_dir>/profile_myprofile`.
 """
 list_help = """List available IPython profiles
 
 List all available profiles, by profile location, that can
 be found in the current working directly or in the ipython
 directory. Profile directories are named using the convention
 'profile_<profile>'.
 """
 profile_help = """Manage IPython profiles
 
 Profile directories contain
 configuration, log and security related files and are named
 using the convention 'profile_<name>'. By default they are
 located in your ipython directory.  You can create profiles
 with `ipython profile create <name>`, or see the profiles you
 already have with `ipython profile list`
 
 To get started configuring IPython, simply do:
 
 $> ipython profile create
 
 and IPython will create the default profile in <ipython_dir>/profile_default,
 where you can edit ipython_config.py to start configuring IPython.
 
 """
 
 _list_examples = "ipython profile list  # list all profiles"
 
 _create_examples = """
 ipython profile create foo         # create profile foo w/ default config files
 ipython profile create foo --reset # restage default config files over current
 ipython profile create foo --parallel # also stage parallel config files
 """
 
 _main_examples = """
 ipython profile create -h  # show the help string for the create subcommand
 ipython profile list -h    # show the help string for the list subcommand
 """
 
 #-----------------------------------------------------------------------------
 # Profile Application Class (for `ipython profile` subcommand)
 #-----------------------------------------------------------------------------
 
 
 class ProfileList(Application):
     name = u'ipython-profile'
     description = list_help
     examples = _list_examples
 
     aliases = Dict({
         'ipython-dir' : 'ProfileList.ipython_dir',
         'log-level' : 'Application.log_level',
     })
     flags = Dict(dict(
         debug = ({'Application' : {'log_level' : 0}},
             "Set Application.log_level to 0, maximizing log output."
         )
     ))
 
     ipython_dir = Unicode(get_ipython_dir(), config=True, 
         help="""
         The name of the IPython directory. This directory is used for logging
         configuration (through profiles), history storage, etc. The default
         is usually $HOME/.ipython. This options can also be specified through
         the environment variable IPYTHON_DIR.
         """
     )
     
     def list_profile_dirs(self):
         # Find the search paths
         paths = [os.getcwdu(), self.ipython_dir]
 
         self.log.warn('Searching for IPython profiles in paths: %r' % paths)
         for path in paths:
             files = os.listdir(path)
             for f in files:
                 full_path = os.path.join(path, f)
                 if os.path.isdir(full_path) and f.startswith('profile_'):
                     profile = f.split('_',1)[-1]
                     start_cmd = 'ipython profile=%s' % profile
                     print start_cmd + " ==> " + full_path
     
     def start(self):
         self.list_profile_dirs()
 
 
 create_flags = {}
 create_flags.update(base_flags)
-create_flags.update(boolean_flag('reset', 'ProfileCreate.overwrite', 
-                "reset config files to defaults", "leave existing config files"))
-create_flags.update(boolean_flag('parallel', 'ProfileCreate.parallel', 
-                "Include parallel computing config files", 
-                "Don't include parallel computing config files"))
+# don't include '--init' flag, which implies running profile create in other apps
+create_flags.pop('init')
+create_flags['reset'] = ({'ProfileCreate': {'overwrite' : True}},
+                        "reset config files in this profile to the defaults.")
+create_flags['parallel'] = ({'ProfileCreate': {'parallel' : True}},
+                        "Include the config files for parallel "
+                        "computing apps (ipengine, ipcontroller, etc.)")
 
 
 class ProfileCreate(BaseIPythonApplication):
     name = u'ipython-profile'
     description = create_help
     examples = _create_examples
     auto_create = Bool(True, config=False)
     
     def _copy_config_files_default(self):
         return True
     
     parallel = Bool(False, config=True,
         help="whether to include parallel computing config files")
     def _parallel_changed(self, name, old, new):
         parallel_files = [   'ipcontroller_config.py', 
                             'ipengine_config.py', 
                             'ipcluster_config.py'
                         ]
         if new:
             for cf in parallel_files:
                 self.config_files.append(cf)
         else:
             for cf in parallel_files:
                 if cf in self.config_files:
                     self.config_files.remove(cf)
     
     def parse_command_line(self, argv):
         super(ProfileCreate, self).parse_command_line(argv)
         # accept positional arg as profile name
         if self.extra_args:
             self.profile = self.extra_args[0]
     
     flags = Dict(create_flags)
     
     classes = [ProfileDir]
     
     def init_config_files(self):
         super(ProfileCreate, self).init_config_files()
         # use local imports, since these classes may import from here
         from IPython.frontend.terminal.ipapp import TerminalIPythonApp
         apps = [TerminalIPythonApp]
         try:
             from IPython.frontend.qt.console.qtconsoleapp import IPythonQtConsoleApp
         except Exception:
             # this should be ImportError, but under weird circumstances
             # this might be an AttributeError, or possibly others
             # in any case, nothing should cause the profile creation to crash.
             pass
         else:
             apps.append(IPythonQtConsoleApp)
         if self.parallel:
             from IPython.parallel.apps.ipcontrollerapp import IPControllerApp
             from IPython.parallel.apps.ipengineapp import IPEngineApp
             from IPython.parallel.apps.ipclusterapp import IPClusterStart
             from IPython.parallel.apps.iploggerapp import IPLoggerApp
             apps.extend([
                 IPControllerApp,
                 IPEngineApp,
                 IPClusterStart,
                 IPLoggerApp,
             ])
         for App in apps:
             app = App()
             app.config.update(self.config)
             app.log = self.log
             app.overwrite = self.overwrite
             app.copy_config_files=True
             app.profile = self.profile
             app.init_profile_dir()
             app.init_config_files()
     
     def stage_default_config_file(self):
         pass
 
 
 class ProfileApp(Application):
     name = u'ipython-profile'
     description = profile_help
     examples = _main_examples
 
     subcommands = Dict(dict(
         create = (ProfileCreate, "Create a new profile dir with default config files"),
         list = (ProfileList, "List existing profiles")
     ))
     
     def start(self):
         if self.subapp is None:
             print "No subcommand specified. Must specify one of: %s"%(self.subcommands.keys())
             print
             self.print_description()
             self.print_subcommands()
             self.exit(1)
         else:
             return self.subapp.start()
 

IPython/frontend/qt/console/qtconsoleapp.py

@@ -1,442 +1,444 b''
 """ A minimal application using the Qt console-style IPython frontend.
 
 This is not a complete console app, as subprocess will not be able to receive
 input, there is no real readline support, among other limitations.
 
 Authors:
 
 * Evan Patterson
 * Min RK
 * Erik Tollerud
 * Fernando Perez
 
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # stdlib imports
 import os
 import signal
 import sys
 
 # System library imports
 from IPython.external.qt import QtGui
 from pygments.styles import get_all_styles
 
 # Local imports
 from IPython.config.application import boolean_flag
 from IPython.core.application import BaseIPythonApplication
 from IPython.core.profiledir import ProfileDir
 from IPython.frontend.qt.console.frontend_widget import FrontendWidget
 from IPython.frontend.qt.console.ipython_widget import IPythonWidget
 from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget
 from IPython.frontend.qt.console import styles
 from IPython.frontend.qt.kernelmanager import QtKernelManager
 from IPython.utils.traitlets import (
     Dict, List, Unicode, Int, CaselessStrEnum, CBool, Any
 )
 from IPython.zmq.ipkernel import (
     flags as ipkernel_flags,
     aliases as ipkernel_aliases,
     IPKernelApp
 )
 from IPython.zmq.session import Session
 from IPython.zmq.zmqshell import ZMQInteractiveShell
 
 
 #-----------------------------------------------------------------------------
 # Network Constants
 #-----------------------------------------------------------------------------
 
 from IPython.utils.localinterfaces import LOCALHOST, LOCAL_IPS
 
 #-----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
 
 _examples = """
 ipython qtconsole                 # start the qtconsole
 ipython qtconsole --pylab=inline  # start with pylab in inline plotting mode
 """
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 class MainWindow(QtGui.QMainWindow):
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
     
     def __init__(self, app, frontend, existing=False, may_close=True,
                     confirm_exit=True):
         """ Create a MainWindow for the specified FrontendWidget.
         
         The app is passed as an argument to allow for different
         closing behavior depending on whether we are the Kernel's parent.
         
         If existing is True, then this Console does not own the Kernel.
         
         If may_close is True, then this Console is permitted to close the kernel
         """
         super(MainWindow, self).__init__()
         self._app = app
         self._frontend = frontend
         self._existing = existing
         if existing:
             self._may_close = may_close
         else:
             self._may_close = True
         self._frontend.exit_requested.connect(self.close)
         self._confirm_exit = confirm_exit
         self.setCentralWidget(frontend)
     
     #---------------------------------------------------------------------------
     # QWidget interface
     #---------------------------------------------------------------------------
     
     def closeEvent(self, event):
         """ Close the window and the kernel (if necessary).
         
         This will prompt the user if they are finished with the kernel, and if
         so, closes the kernel cleanly. Alternatively, if the exit magic is used,
         it closes without prompt.
         """
         keepkernel = None #Use the prompt by default
         if hasattr(self._frontend,'_keep_kernel_on_exit'): #set by exit magic
             keepkernel = self._frontend._keep_kernel_on_exit
         
         kernel_manager = self._frontend.kernel_manager
         
         if keepkernel is None and not self._confirm_exit:
             # don't prompt, just terminate the kernel if we own it
             # or leave it alone if we don't
             keepkernel = not self._existing
         
         if keepkernel is None: #show prompt
             if kernel_manager and kernel_manager.channels_running:
                 title = self.window().windowTitle()
                 cancel = QtGui.QMessageBox.Cancel
                 okay = QtGui.QMessageBox.Ok
                 if self._may_close:
                     msg = "You are closing this Console window."
                     info = "Would you like to quit the Kernel and all attached Consoles as well?"
                     justthis = QtGui.QPushButton("&No, just this Console", self)
                     justthis.setShortcut('N')
                     closeall = QtGui.QPushButton("&Yes, quit everything", self)
                     closeall.setShortcut('Y')
                     box = QtGui.QMessageBox(QtGui.QMessageBox.Question,
                                             title, msg)
                     box.setInformativeText(info)
                     box.addButton(cancel)
                     box.addButton(justthis, QtGui.QMessageBox.NoRole)
                     box.addButton(closeall, QtGui.QMessageBox.YesRole)
                     box.setDefaultButton(closeall)
                     box.setEscapeButton(cancel)
                     reply = box.exec_()
                     if reply == 1: # close All
                         kernel_manager.shutdown_kernel()
                         #kernel_manager.stop_channels()
                         event.accept()
                     elif reply == 0: # close Console
                         if not self._existing:
                             # Have kernel: don't quit, just close the window
                             self._app.setQuitOnLastWindowClosed(False)
                             self.deleteLater()
                         event.accept()
                     else:
                         event.ignore()
                 else:
                     reply = QtGui.QMessageBox.question(self, title,
                         "Are you sure you want to close this Console?"+
                         "\nThe Kernel and other Consoles will remain active.",
                         okay|cancel,
                         defaultButton=okay
                         )
                     if reply == okay:
                         event.accept()
                     else:
                         event.ignore()
         elif keepkernel: #close console but leave kernel running (no prompt)
             if kernel_manager and kernel_manager.channels_running:
                 if not self._existing:
                     # I have the kernel: don't quit, just close the window
                     self._app.setQuitOnLastWindowClosed(False)
                 event.accept()
         else: #close console and kernel (no prompt)
             if kernel_manager and kernel_manager.channels_running:
                 kernel_manager.shutdown_kernel()
                 event.accept()
 
 #-----------------------------------------------------------------------------
 # Aliases and Flags
 #-----------------------------------------------------------------------------
 
 flags = dict(ipkernel_flags)
-
-flags.update({
+qt_flags = {
     'existing' : ({'IPythonQtConsoleApp' : {'existing' : True}},
             "Connect to an existing kernel."),
     'pure' : ({'IPythonQtConsoleApp' : {'pure' : True}},
             "Use a pure Python kernel instead of an IPython kernel."),
     'plain' : ({'ConsoleWidget' : {'kind' : 'plain'}},
             "Disable rich text support."),
-})
-flags.update(boolean_flag(
+}
+qt_flags.update(boolean_flag(
     'gui-completion', 'ConsoleWidget.gui_completion',
     "use a GUI widget for tab completion",
     "use plaintext output for completion"
 ))
-flags.update(boolean_flag(
+qt_flags.update(boolean_flag(
     'confirm-exit', 'IPythonQtConsoleApp.confirm_exit',
     """Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
        to force a direct exit without any confirmation.
     """,
     """Don't prompt the user when exiting. This will terminate the kernel
        if it is owned by the frontend, and leave it alive if it is external.
     """
 ))
+flags.update(qt_flags)
 # the flags that are specific to the frontend
 # these must be scrubbed before being passed to the kernel,
 # or it will raise an error on unrecognized flags
-qt_flags = ['existing', 'pure', 'plain', 'gui-completion', 'no-gui-completion',
-            'confirm-exit', 'no-confirm-exit']
+qt_flags = qt_flags.keys()
 
 aliases = dict(ipkernel_aliases)
 
-aliases.update(dict(
+qt_aliases = dict(
     hb = 'IPythonQtConsoleApp.hb_port',
     shell = 'IPythonQtConsoleApp.shell_port',
     iopub = 'IPythonQtConsoleApp.iopub_port',
     stdin = 'IPythonQtConsoleApp.stdin_port',
     ip = 'IPythonQtConsoleApp.ip',
 
-    plain = 'IPythonQtConsoleApp.plain',
-    pure = 'IPythonQtConsoleApp.pure',
     style = 'IPythonWidget.syntax_style',
     stylesheet = 'IPythonQtConsoleApp.stylesheet',
     colors = 'ZMQInteractiveShell.colors',
 
     editor = 'IPythonWidget.editor',
     paging = 'ConsoleWidget.paging',
-))
-aliases['gui-completion'] = 'ConsoleWidget.gui_completion'
+)
+aliases.update(qt_aliases)
+# also scrub aliases from the frontend
+qt_flags.extend(qt_aliases.keys())
 
 
 #-----------------------------------------------------------------------------
 # IPythonQtConsole
 #-----------------------------------------------------------------------------
 
 
 class IPythonQtConsoleApp(BaseIPythonApplication):
     name = 'ipython-qtconsole'
     default_config_file_name='ipython_config.py'
     
     description = """
         The IPython QtConsole.
         
         This launches a Console-style application using Qt.  It is not a full
         console, in that launched terminal subprocesses will not be able to accept
         input.
         
         The QtConsole supports various extra features beyond the Terminal IPython
         shell, such as inline plotting with matplotlib, via:
         
             ipython qtconsole --pylab=inline
         
         as well as saving your session as HTML, and printing the output.
         
     """
     examples = _examples
 
     classes = [IPKernelApp, IPythonWidget, ZMQInteractiveShell, ProfileDir, Session]
     flags = Dict(flags)
     aliases = Dict(aliases)
 
     kernel_argv = List(Unicode)
 
     # connection info:
     ip = Unicode(LOCALHOST, config=True,
         help="""Set the kernel\'s IP address [default localhost].
         If the IP address is something other than localhost, then
         Consoles on other machines will be able to connect
         to the Kernel, so be careful!"""
     )
     hb_port = Int(0, config=True,
         help="set the heartbeat port [default: random]")
     shell_port = Int(0, config=True,
         help="set the shell (XREP) port [default: random]")
     iopub_port = Int(0, config=True,
         help="set the iopub (PUB) port [default: random]")
     stdin_port = Int(0, config=True,
         help="set the stdin (XREQ) port [default: random]")
 
     existing = CBool(False, config=True,
         help="Whether to connect to an already running Kernel.")
 
     stylesheet = Unicode('', config=True,
         help="path to a custom CSS stylesheet")
 
     pure = CBool(False, config=True,
         help="Use a pure Python kernel instead of an IPython kernel.")
     plain = CBool(False, config=True,
         help="Use a plaintext widget instead of rich text (plain can't print/save).")
 
     def _pure_changed(self, name, old, new):
         kind = 'plain' if self.plain else 'rich'
         self.config.ConsoleWidget.kind = kind
         if self.pure:
             self.widget_factory = FrontendWidget
         elif self.plain:
             self.widget_factory = IPythonWidget
         else:
             self.widget_factory = RichIPythonWidget
 
     _plain_changed = _pure_changed
 
     confirm_exit = CBool(True, config=True,
         help="""
         Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
         to force a direct exit without any confirmation.""",
     )
     
     # the factory for creating a widget
     widget_factory = Any(RichIPythonWidget)
 
     def parse_command_line(self, argv=None):
         super(IPythonQtConsoleApp, self).parse_command_line(argv)
         if argv is None:
             argv = sys.argv[1:]
 
         self.kernel_argv = list(argv) # copy
         # kernel should inherit default config file from frontend
         self.kernel_argv.append("--KernelApp.parent_appname='%s'"%self.name)
         # scrub frontend-specific flags
         for a in argv:
-            if a.startswith('-') and a.lstrip('-') in qt_flags:
-                self.kernel_argv.remove(a)
+            
+            if a.startswith('-'):
+                key = a.lstrip('-').split('=')[0]
+                if key in qt_flags:
+                    self.kernel_argv.remove(a)
 
     def init_kernel_manager(self):
         # Don't let Qt or ZMQ swallow KeyboardInterupts.
         signal.signal(signal.SIGINT, signal.SIG_DFL)
 
         # Create a KernelManager and start a kernel.
         self.kernel_manager = QtKernelManager(
                                 shell_address=(self.ip, self.shell_port),
                                 sub_address=(self.ip, self.iopub_port),
                                 stdin_address=(self.ip, self.stdin_port),
                                 hb_address=(self.ip, self.hb_port),
                                 config=self.config
         )
         # start the kernel
         if not self.existing:
             kwargs = dict(ip=self.ip, ipython=not self.pure)
             kwargs['extra_arguments'] = self.kernel_argv
             self.kernel_manager.start_kernel(**kwargs)
         self.kernel_manager.start_channels()
 
 
     def init_qt_elements(self):
         # Create the widget.
         self.app = QtGui.QApplication([])
         local_kernel = (not self.existing) or self.ip in LOCAL_IPS
         self.widget = self.widget_factory(config=self.config,
                                         local_kernel=local_kernel)
         self.widget.kernel_manager = self.kernel_manager
         self.window = MainWindow(self.app, self.widget, self.existing,
                                 may_close=local_kernel,
                                 confirm_exit=self.confirm_exit)
         self.window.setWindowTitle('Python' if self.pure else 'IPython')
 
     def init_colors(self):
         """Configure the coloring of the widget"""
         # Note: This will be dramatically simplified when colors
         # are removed from the backend.
 
         if self.pure:
             # only IPythonWidget supports styling
             return
 
         # parse the colors arg down to current known labels
         try:
             colors = self.config.ZMQInteractiveShell.colors
         except AttributeError:
             colors = None
         try:
             style = self.config.IPythonWidget.colors
         except AttributeError:
             style = None
 
         # find the value for colors:
         if colors:
             colors=colors.lower()
             if colors in ('lightbg', 'light'):
                 colors='lightbg'
             elif colors in ('dark', 'linux'):
                 colors='linux'
             else:
                 colors='nocolor'
         elif style:
             if style=='bw':
                 colors='nocolor'
             elif styles.dark_style(style):
                 colors='linux'
             else:
                 colors='lightbg'
         else:
             colors=None
 
         # Configure the style.
         widget = self.widget
         if style:
             widget.style_sheet = styles.sheet_from_template(style, colors)
             widget.syntax_style = style
             widget._syntax_style_changed()
             widget._style_sheet_changed()
         elif colors:
             # use a default style
             widget.set_default_style(colors=colors)
         else:
             # this is redundant for now, but allows the widget's
             # defaults to change
             widget.set_default_style()
 
         if self.stylesheet:
             # we got an expicit stylesheet
             if os.path.isfile(self.stylesheet):
                 with open(self.stylesheet) as f:
                     sheet = f.read()
                 widget.style_sheet = sheet
                 widget._style_sheet_changed()
             else:
                 raise IOError("Stylesheet %r not found."%self.stylesheet)
 
     def initialize(self, argv=None):
         super(IPythonQtConsoleApp, self).initialize(argv)
         self.init_kernel_manager()
         self.init_qt_elements()
         self.init_colors()
 
     def start(self):
 
         # draw the window
         self.window.show()
 
         # Start the application main loop.
         self.app.exec_()
 
 #-----------------------------------------------------------------------------
 # Main entry point
 #-----------------------------------------------------------------------------
 
 def main():
     app = IPythonQtConsoleApp()
     app.initialize()
     app.start()
 
 
 if __name__ == '__main__':
     main()

IPython/parallel/apps/ipclusterapp.py

@@ -1,484 +1,529 b''
 #!/usr/bin/env python
 # encoding: utf-8
 """
 The ipcluster application.
 
 Authors:
 
 * Brian Granger
 * MinRK
 
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import errno
 import logging
 import os
 import re
 import signal
 
 from subprocess import check_call, CalledProcessError, PIPE
 import zmq
 from zmq.eventloop import ioloop
 
 from IPython.config.application import Application, boolean_flag
 from IPython.config.loader import Config
 from IPython.core.application import BaseIPythonApplication
 from IPython.core.profiledir import ProfileDir
 from IPython.utils.daemonize import daemonize
 from IPython.utils.importstring import import_item
+from IPython.utils.sysinfo import num_cpus
 from IPython.utils.traitlets import (Int, Unicode, Bool, CFloat, Dict, List, 
                                         DottedObjectName)
 
 from IPython.parallel.apps.baseapp import (
     BaseParallelApplication,
     PIDFileError,
     base_flags, base_aliases
 )
 
 
 #-----------------------------------------------------------------------------
 # Module level variables
 #-----------------------------------------------------------------------------
 
 
 default_config_file_name = u'ipcluster_config.py'
 
 
 _description = """Start an IPython cluster for parallel computing.
 
 An IPython cluster consists of 1 controller and 1 or more engines.
 This command automates the startup of these processes using a wide
 range of startup methods (SSH, local processes, PBS, mpiexec,
 Windows HPC Server 2008). To start a cluster with 4 engines on your
 local host simply do 'ipcluster start --n=4'. For more complex usage
 you will typically do 'ipython create mycluster --parallel', then edit
 configuration files, followed by 'ipcluster start --profile=mycluster --n=4'.
 """
 
 _main_examples = """
 ipcluster start --n=4 # start a 4 node cluster on localhost
 ipcluster start -h    # show the help string for the start subcmd
 
 ipcluster stop -h     # show the help string for the stop subcmd
 ipcluster engines -h  # show the help string for the engines subcmd
 """
 
 _start_examples = """
 ipython profile create mycluster --parallel # create mycluster profile
 ipcluster start --profile=mycluster --n=4   # start mycluster with 4 nodes
 """
 
 _stop_examples = """
 ipcluster stop --profile=mycluster  # stop a running cluster by profile name
 """
 
 _engines_examples = """
 ipcluster engines --profile=mycluster --n=4  # start 4 engines only
 """
 
 
 # Exit codes for ipcluster
 
 # This will be the exit code if the ipcluster appears to be running because
 # a .pid file exists
 ALREADY_STARTED = 10
 
 
 # This will be the exit code if ipcluster stop is run, but there is not .pid
 # file to be found.
 ALREADY_STOPPED = 11
 
 # This will be the exit code if ipcluster engines is run, but there is not .pid
 # file to be found.
 NO_CLUSTER = 12
 
 
 #-----------------------------------------------------------------------------
 # Main application
 #-----------------------------------------------------------------------------
 start_help = """Start an IPython cluster for parallel computing
 
 Start an ipython cluster by its profile name or cluster
 directory. Cluster directories contain configuration, log and
 security related files and are named using the convention
 'profile_<name>' and should be creating using the 'start'
 subcommand of 'ipcluster'. If your cluster directory is in 
 the cwd or the ipython directory, you can simply refer to it
 using its profile name, 'ipcluster start --n=4 --profile=<profile>`,
 otherwise use the 'profile-dir' option.
 """
 stop_help = """Stop a running IPython cluster
 
 Stop a running ipython cluster by its profile name or cluster
 directory. Cluster directories are named using the convention
 'profile_<name>'. If your cluster directory is in 
 the cwd or the ipython directory, you can simply refer to it
 using its profile name, 'ipcluster stop --profile=<profile>`, otherwise
 use the '--profile-dir' option.
 """
 engines_help = """Start engines connected to an existing IPython cluster
 
 Start one or more engines to connect to an existing Cluster
 by profile name or cluster directory.
 Cluster directories contain configuration, log and
 security related files and are named using the convention
 'profile_<name>' and should be creating using the 'start'
 subcommand of 'ipcluster'. If your cluster directory is in 
 the cwd or the ipython directory, you can simply refer to it
 using its profile name, 'ipcluster engines --n=4 --profile=<profile>`,
 otherwise use the 'profile-dir' option.
 """
 stop_aliases = dict(
     signal='IPClusterStop.signal',
 )
 stop_aliases.update(base_aliases)
 
 class IPClusterStop(BaseParallelApplication):
     name = u'ipcluster'
     description = stop_help
     examples = _stop_examples
     config_file_name = Unicode(default_config_file_name)
     
     signal = Int(signal.SIGINT, config=True,
         help="signal to use for stopping processes.")
         
     aliases = Dict(stop_aliases)
     
     def start(self):
         """Start the app for the stop subcommand."""
         try:
             pid = self.get_pid_from_file()
         except PIDFileError:
             self.log.critical(
                 'Could not read pid file, cluster is probably not running.'
             )
             # Here I exit with a unusual exit status that other processes
             # can watch for to learn how I existed.
             self.remove_pid_file()
             self.exit(ALREADY_STOPPED)
         
         if not self.check_pid(pid):
             self.log.critical(
                 'Cluster [pid=%r] is not running.' % pid
             )
             self.remove_pid_file()
             # Here I exit with a unusual exit status that other processes
             # can watch for to learn how I existed.
             self.exit(ALREADY_STOPPED)
             
         elif os.name=='posix':
             sig = self.signal
             self.log.info(
                 "Stopping cluster [pid=%r] with [signal=%r]" % (pid, sig)
             )
             try:
                 os.kill(pid, sig)
             except OSError:
                 self.log.error("Stopping cluster failed, assuming already dead.",
                     exc_info=True)
                 self.remove_pid_file()
         elif os.name=='nt':
             try:
                 # kill the whole tree
                 p = check_call(['taskkill', '-pid', str(pid), '-t', '-f'], stdout=PIPE,stderr=PIPE)
             except (CalledProcessError, OSError):
                 self.log.error("Stopping cluster failed, assuming already dead.",
                     exc_info=True)
             self.remove_pid_file()
     
 engine_aliases = {}
 engine_aliases.update(base_aliases)
 engine_aliases.update(dict(
     n='IPClusterEngines.n',
     engines = 'IPClusterEngines.engine_launcher_class',
     daemonize = 'IPClusterEngines.daemonize',
 ))
 engine_flags = {}
 engine_flags.update(base_flags)
 
 engine_flags.update(dict(
     daemonize=(
         {'IPClusterEngines' : {'daemonize' : True}},
         """run the cluster into the background (not available on Windows)""",
     )
 ))
 class IPClusterEngines(BaseParallelApplication):
 
     name = u'ipcluster'
     description = engines_help
     examples = _engines_examples
     usage = None
     config_file_name = Unicode(default_config_file_name)
     default_log_level = logging.INFO
     classes = List()
     def _classes_default(self):
         from IPython.parallel.apps import launcher
         launchers = launcher.all_launchers
         eslaunchers = [ l for l in launchers if 'EngineSet' in l.__name__]
         return [ProfileDir]+eslaunchers
     
-    n = Int(2, config=True,
-        help="The number of engines to start.")
+    n = Int(num_cpus(), config=True,
+        help="""The number of engines to start. The default is to use one for each
+        CPU on your machine""")
 
     engine_launcher_class = DottedObjectName('LocalEngineSetLauncher',
         config=True,
-        help="The class for launching a set of Engines."
+        help="""The class for launching a set of Engines. Change this value
+        to use various batch systems to launch your engines, such as PBS,SGE,MPIExec,etc.
+        Each launcher class has its own set of configuration options, for making sure
+        it will work in your environment.
+        
+        You can also write your own launcher, and specify it's absolute import path,
+        as in 'mymodule.launcher.FTLEnginesLauncher`.
+        
+        Examples include:
+        
+            LocalEngineSetLauncher : start engines locally as subprocesses [default]
+            MPIExecEngineSetLauncher : use mpiexec to launch in an MPI environment
+            PBSEngineSetLauncher : use PBS (qsub) to submit engines to a batch queue
+            SGEEngineSetLauncher : use SGE (qsub) to submit engines to a batch queue
+            SSHEngineSetLauncher : use SSH to start the controller
+                                Note that SSH does *not* move the connection files
+                                around, so you will likely have to do this manually
+                                unless the machines are on a shared file system.
+            WindowsHPCEngineSetLauncher : use Windows HPC
+        """
         )
     daemonize = Bool(False, config=True,
         help="""Daemonize the ipcluster program. This implies --log-to-file.
         Not available on Windows.
         """)
 
     def _daemonize_changed(self, name, old, new):
         if new:
             self.log_to_file = True
 
     aliases = Dict(engine_aliases)
     flags = Dict(engine_flags)
     _stopping = False
 
     def initialize(self, argv=None):
         super(IPClusterEngines, self).initialize(argv)
         self.init_signal()
         self.init_launchers()
     
     def init_launchers(self):
         self.engine_launcher = self.build_launcher(self.engine_launcher_class)
         self.engine_launcher.on_stop(lambda r: self.loop.stop())
     
     def init_signal(self):
         # Setup signals
         signal.signal(signal.SIGINT, self.sigint_handler)
     
     def build_launcher(self, clsname):
         """import and instantiate a Launcher based on importstring"""
         if '.' not in clsname:
             # not a module, presume it's the raw name in apps.launcher
             clsname = 'IPython.parallel.apps.launcher.'+clsname
         # print repr(clsname)
-        klass = import_item(clsname)
+        try:
+            klass = import_item(clsname)
+        except (ImportError, KeyError):
+            self.log.fatal("Could not import launcher class: %r"%clsname)
+            self.exit(1)
 
         launcher = klass(
-            work_dir=self.profile_dir.location, config=self.config, log=self.log
+            work_dir=u'.', config=self.config, log=self.log
         )
         return launcher
     
     def start_engines(self):
         self.log.info("Starting %i engines"%self.n)
         self.engine_launcher.start(
             self.n,
             self.profile_dir.location
         )
 
     def stop_engines(self):
         self.log.info("Stopping Engines...")
         if self.engine_launcher.running:
             d = self.engine_launcher.stop()
             return d
         else:
             return None
 
     def stop_launchers(self, r=None):
         if not self._stopping:
             self._stopping = True
             self.log.error("IPython cluster: stopping")
             self.stop_engines()
             # Wait a few seconds to let things shut down.
             dc = ioloop.DelayedCallback(self.loop.stop, 4000, self.loop)
             dc.start()
 
     def sigint_handler(self, signum, frame):
         self.log.debug("SIGINT received, stopping launchers...")
         self.stop_launchers()
         
     def start_logging(self):
         # Remove old log files of the controller and engine
         if self.clean_logs:
             log_dir = self.profile_dir.log_dir
             for f in os.listdir(log_dir):
                 if re.match(r'ip(engine|controller)z-\d+\.(log|err|out)',f):
                     os.remove(os.path.join(log_dir, f))
         # This will remove old log files for ipcluster itself
         # super(IPBaseParallelApplication, self).start_logging()
 
     def start(self):
         """Start the app for the engines subcommand."""
         self.log.info("IPython cluster: started")
         # First see if the cluster is already running
         
         # Now log and daemonize
         self.log.info(
             'Starting engines with [daemon=%r]' % self.daemonize
         )
         # TODO: Get daemonize working on Windows or as a Windows Server.
         if self.daemonize:
             if os.name=='posix':
                 daemonize()
 
         dc = ioloop.DelayedCallback(self.start_engines, 0, self.loop)
         dc.start()
         # Now write the new pid file AFTER our new forked pid is active.
         # self.write_pid_file()
         try:
             self.loop.start()
         except KeyboardInterrupt:
             pass
         except zmq.ZMQError as e:
             if e.errno == errno.EINTR:
                 pass
             else:
                 raise
 
 start_aliases = {}
 start_aliases.update(engine_aliases)
 start_aliases.update(dict(
     delay='IPClusterStart.delay',
     controller = 'IPClusterStart.controller_launcher_class',
 ))
 start_aliases['clean-logs'] = 'IPClusterStart.clean_logs'
 
+# set inherited Start keys directly, to ensure command-line args get higher priority
+# than config file options.
+for key,value in start_aliases.items():
+    if value.startswith('IPClusterEngines'):
+        start_aliases[key] = value.replace('IPClusterEngines', 'IPClusterStart')
+
 class IPClusterStart(IPClusterEngines):
 
     name = u'ipcluster'
     description = start_help
     examples = _start_examples
     default_log_level = logging.INFO
     auto_create = Bool(True, config=True,
         help="whether to create the profile_dir if it doesn't exist")
     classes = List()
     def _classes_default(self,):
         from IPython.parallel.apps import launcher
         return [ProfileDir] + [IPClusterEngines] + launcher.all_launchers
     
     clean_logs = Bool(True, config=True, 
         help="whether to cleanup old logs before starting")
 
     delay = CFloat(1., config=True,
         help="delay (in s) between starting the controller and the engines")
 
     controller_launcher_class = DottedObjectName('LocalControllerLauncher',
         config=True,
-        help="The class for launching a Controller."
+        helep="""The class for launching a Controller. Change this value if you want
+        your controller to also be launched by a batch system, such as PBS,SGE,MPIExec,etc.
+        
+        Each launcher class has its own set of configuration options, for making sure
+        it will work in your environment.
+        
+        Examples include:
+        
+            LocalControllerLauncher : start engines locally as subprocesses
+            MPIExecControllerLauncher : use mpiexec to launch engines in an MPI universe
+            PBSControllerLauncher : use PBS (qsub) to submit engines to a batch queue
+            SGEControllerLauncher : use SGE (qsub) to submit engines to a batch queue
+            SSHControllerLauncher : use SSH to start the controller
+            WindowsHPCControllerLauncher : use Windows HPC
+        """
         )
     reset = Bool(False, config=True,
         help="Whether to reset config files as part of '--create'."
         )
     
     # flags = Dict(flags)
     aliases = Dict(start_aliases)
 
     def init_launchers(self):
         self.controller_launcher = self.build_launcher(self.controller_launcher_class)
         self.engine_launcher = self.build_launcher(self.engine_launcher_class)
         self.controller_launcher.on_stop(self.stop_launchers)
     
     def start_controller(self):
         self.controller_launcher.start(
             self.profile_dir.location
         )
         
     def stop_controller(self):
         # self.log.info("In stop_controller")
         if self.controller_launcher and self.controller_launcher.running:
             return self.controller_launcher.stop()
 
     def stop_launchers(self, r=None):
         if not self._stopping:
             self.stop_controller()
             super(IPClusterStart, self).stop_launchers()
 
     def start(self):
         """Start the app for the start subcommand."""
         # First see if the cluster is already running
         try:
             pid = self.get_pid_from_file()
         except PIDFileError:
             pass
         else:
             if self.check_pid(pid):
                 self.log.critical(
                     'Cluster is already running with [pid=%s]. '
                     'use "ipcluster stop" to stop the cluster.' % pid
                 )
                 # Here I exit with a unusual exit status that other processes
                 # can watch for to learn how I existed.
                 self.exit(ALREADY_STARTED)
             else:
                 self.remove_pid_file()
                 
 
         # Now log and daemonize
         self.log.info(
             'Starting ipcluster with [daemon=%r]' % self.daemonize
         )
         # TODO: Get daemonize working on Windows or as a Windows Server.
         if self.daemonize:
             if os.name=='posix':
                 daemonize()
 
         dc = ioloop.DelayedCallback(self.start_controller, 0, self.loop)
         dc.start()
         dc = ioloop.DelayedCallback(self.start_engines, 1000*self.delay, self.loop)
         dc.start()
         # Now write the new pid file AFTER our new forked pid is active.
         self.write_pid_file()
         try:
             self.loop.start()
         except KeyboardInterrupt:
             pass
         except zmq.ZMQError as e:
             if e.errno == errno.EINTR:
                 pass
             else:
                 raise
         finally:
             self.remove_pid_file()
 
 base='IPython.parallel.apps.ipclusterapp.IPCluster'
 
 class IPClusterApp(Application):
     name = u'ipcluster'
     description = _description
     examples = _main_examples
 
     subcommands = {
                 'start' : (base+'Start', start_help),
                 'stop' : (base+'Stop', stop_help),
                 'engines' : (base+'Engines', engines_help),
     }
     
     # no aliases or flags for parent App
     aliases = Dict()
     flags = Dict()
     
     def start(self):
         if self.subapp is None:
             print "No subcommand specified. Must specify one of: %s"%(self.subcommands.keys())
             print
             self.print_description()
             self.print_subcommands()
             self.exit(1)
         else:
             return self.subapp.start()
 
 def launch_new_instance():
     """Create and run the IPython cluster."""
     app = IPClusterApp.instance()
     app.initialize()
     app.start()
 
 
 if __name__ == '__main__':
     launch_new_instance()