don't load gui/pylab in console frontend

IPython/frontend/terminal/console/app.py

@@ -1,152 +1,156 b''
 """ A minimal application using the ZMQ-based terminal 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:
 
 * Min RK
 * Paul Ivanov
 
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 import signal
 import sys
 import time
 
 from IPython.frontend.terminal.ipapp import TerminalIPythonApp, frontend_flags as term_flags
 
 from IPython.utils.traitlets import (
     Dict, List, Unicode, Int, CaselessStrEnum, CBool, Any
 )
 from IPython.utils.warn import warn,error
 
 from IPython.zmq.ipkernel import IPKernelApp
 from IPython.zmq.session import Session, default_secure
 from IPython.zmq.zmqshell import ZMQInteractiveShell
 from IPython.frontend.consoleapp import (
         IPythonConsoleApp, app_aliases, app_flags, aliases, app_aliases, flags
     )
 
 from IPython.frontend.terminal.console.interactiveshell import ZMQTerminalInteractiveShell
 
 #-----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
 
 _examples = """
 ipython console # start the ZMQ-based console
 ipython console --existing # connect to an existing ipython session
 """
 
 #-----------------------------------------------------------------------------
 # Flags and Aliases
 #-----------------------------------------------------------------------------
 
 # copy flags from mixin:
 flags = dict(flags)
 # start with mixin frontend flags:
 frontend_flags = dict(app_flags)
 # add TerminalIPApp flags:
 frontend_flags.update(term_flags)
 # pylab is not frontend-specific in two-process IPython
 frontend_flags.pop('pylab')
 # disable quick startup, as it won't propagate to the kernel anyway
 frontend_flags.pop('quick')
 # update full dict with frontend flags:
 flags.update(frontend_flags)
 
 # copy flags from mixin
 aliases = dict(aliases)
 # start with mixin frontend flags
 frontend_aliases = dict(app_aliases)
 # load updated frontend flags into full dict
 aliases.update(frontend_aliases)
 
 # get flags&aliases into sets, and remove a couple that
 # shouldn't be scrubbed from backend flags:
 frontend_aliases = set(frontend_aliases.keys())
 frontend_flags = set(frontend_flags.keys())
 
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 
 class ZMQTerminalIPythonApp(TerminalIPythonApp, IPythonConsoleApp):
     name = "ipython-console"
     """Start a terminal frontend to the IPython zmq kernel."""
 
     description = """
         The IPython terminal-based Console.
 
         This launches a Console application inside a terminal.
 
         The Console supports various extra features beyond the traditional
         single-process Terminal IPython shell, such as connecting to an
         existing ipython session, via:
 
             ipython console --existing
 
         where the previous session could have been created by another ipython
         console, an ipython qtconsole, or by opening an ipython notebook.
 
     """
     examples = _examples
 
     classes = List([IPKernelApp, ZMQTerminalInteractiveShell, Session])
     flags = Dict(flags)
     aliases = Dict(aliases)
     frontend_aliases = Any(frontend_aliases)
     frontend_flags = Any(frontend_flags)
     
     subcommands = Dict()
 
     def parse_command_line(self, argv=None):
         super(ZMQTerminalIPythonApp, self).parse_command_line(argv)
         self.build_kernel_argv(argv)
 
     def init_shell(self):
         IPythonConsoleApp.initialize(self)
         # relay sigint to kernel
         signal.signal(signal.SIGINT, self.handle_sigint)
         self.shell = ZMQTerminalInteractiveShell.instance(config=self.config,
                         display_banner=False, profile_dir=self.profile_dir,
                         ipython_dir=self.ipython_dir, kernel_manager=self.kernel_manager)
 
+    def init_gui_pylab(self):
+        # no-op, because we don't want to import matplotlib in the frontend.
+        pass
+
     def handle_sigint(self, *args):
         if self.shell._executing:
             if self.kernel_manager.has_kernel:
                 # interrupt already gets passed to subprocess by signal handler.
                 # Only if we prevent that should we need to explicitly call
                 # interrupt_kernel, until which time, this would result in a 
                 # double-interrupt:
                 # self.kernel_manager.interrupt_kernel()
                 pass
             else:
                 self.shell.write_err('\n')
                 error("Cannot interrupt kernels we didn't start.\n")
         else:
             # raise the KeyboardInterrupt if we aren't waiting for execution,
             # so that the interact loop advances, and prompt is redrawn, etc.
             raise KeyboardInterrupt
             
 
     def init_code(self):
         # no-op in the frontend, code gets run in the backend
         pass
 
 def launch_new_instance():
     """Create and run a full blown IPython instance"""
     app = ZMQTerminalIPythonApp.instance()
     app.initialize()
     app.start()
 
 
 if __name__ == '__main__':
     launch_new_instance()