IPython/frontend/terminal/ipapp.py

#!/usr/bin/env python
# encoding: utf-8
"""
The :class:`~IPython.core.application.Application` object for the command
line :command:`ipython` program.

Authors
-------

* Brian Granger
* Fernando Perez
* Min Ragan-Kelley
"""

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

from __future__ import absolute_import

import logging
import os
import sys

from IPython.config.loader import (
    Config, PyFileConfigLoader, ConfigFileNotFound
)
from IPython.config.application import boolean_flag, catch_config_error
from IPython.core import release
from IPython.core import usage
from IPython.core.completer import IPCompleter
from IPython.core.crashhandler import CrashHandler
from IPython.core.formatters import PlainTextFormatter
from IPython.core.prompts import PromptManager
from IPython.core.application import (
    ProfileDir, BaseIPythonApplication, base_flags, base_aliases
)
from IPython.core.shellapp import (
    InteractiveShellApp, shell_flags, shell_aliases
)
from IPython.frontend.terminal.interactiveshell import TerminalInteractiveShell
from IPython.lib import inputhook
from IPython.utils import warn
from IPython.utils.path import get_ipython_dir, check_for_old_config
from IPython.utils.traitlets import (
    Bool, List, Dict, CaselessStrEnum
)

#-----------------------------------------------------------------------------
# Globals, utilities and helpers
#-----------------------------------------------------------------------------

#: The default config file name for this application.
default_config_file_name = u'ipython_config.py'

_examples = """
ipython --pylab            # start in pylab mode
ipython --pylab=qt         # start in pylab mode with the qt4 backend
ipython --log-level=DEBUG  # set logging to DEBUG
ipython --profile=foo      # start with profile foo

ipython qtconsole          # start the qtconsole GUI application
ipython help qtconsole     # show the help for the qtconsole subcmd

ipython console            # start the terminal-based console application
ipython help console       # show the help for the console subcmd

ipython notebook           # start the IPython notebook
ipython help notebook      # show the help for the notebook subcmd

ipython profile create foo # create profile foo w/ default config files
ipython help profile       # show the help for the profile subcmd
"""

#-----------------------------------------------------------------------------
# Crash handler for this application
#-----------------------------------------------------------------------------

class IPAppCrashHandler(CrashHandler):
    """sys.excepthook for IPython itself, leaves a detailed report on disk."""

    def __init__(self, app):
        contact_name = release.authors['Fernando'][0]
        contact_email = release.author_email
        bug_tracker = 'https://github.com/ipython/ipython/issues'
        super(IPAppCrashHandler,self).__init__(
            app, contact_name, contact_email, bug_tracker
        )

    def make_report(self,traceback):
        """Return a string containing a crash report."""

        sec_sep = self.section_sep
        # Start with parent report
        report = [super(IPAppCrashHandler, self).make_report(traceback)]
        # Add interactive-specific info we may have
        rpt_add = report.append
        try:
            rpt_add(sec_sep+"History of session input:")
            for line in self.app.shell.user_ns['_ih']:
                rpt_add(line)
            rpt_add('\n*** Last line of input (may not be in above history):\n')
            rpt_add(self.app.shell._last_input_line+'\n')
        except:
            pass

        return ''.join(report)

#-----------------------------------------------------------------------------
# Aliases and Flags
#-----------------------------------------------------------------------------
flags = dict(base_flags)
flags.update(shell_flags)
frontend_flags = {}
addflag = lambda *args: frontend_flags.update(boolean_flag(*args))
addflag('autoedit-syntax', 'TerminalInteractiveShell.autoedit_syntax',
        'Turn on auto editing of files with syntax errors.',
        'Turn off auto editing of files with syntax errors.'
)
addflag('banner', 'TerminalIPythonApp.display_banner',
        "Display a banner upon starting IPython.",
        "Don't display a banner upon starting IPython."
)
addflag('confirm-exit', 'TerminalInteractiveShell.confirm_exit',
    """Set to confirm when you try to exit IPython with an EOF (Control-D
    in Unix, Control-Z/Enter in Windows). By typing 'exit' or 'quit',
    you can force a direct exit without any confirmation.""",
    "Don't prompt the user when exiting."
)
addflag('term-title', 'TerminalInteractiveShell.term_title',
    "Enable auto setting the terminal title.",
    "Disable auto setting the terminal title."
)
classic_config = Config()
classic_config.InteractiveShell.cache_size = 0
classic_config.PlainTextFormatter.pprint = False
classic_config.PromptManager.in_template = '>>> '
classic_config.PromptManager.in2_template = '... '
classic_config.PromptManager.out_template = ''
classic_config.InteractiveShell.separate_in = ''
classic_config.InteractiveShell.separate_out = ''
classic_config.InteractiveShell.separate_out2 = ''
classic_config.InteractiveShell.colors = 'NoColor'
classic_config.InteractiveShell.xmode = 'Plain'

frontend_flags['classic']=(
    classic_config,
    "Gives IPython a similar feel to the classic Python prompt."
)
# # log doesn't make so much sense this way anymore
# paa('--log','-l',
#     action='store_true', dest='InteractiveShell.logstart',
#     help="Start logging to the default log file (./ipython_log.py).")
#
# # quick is harder to implement
frontend_flags['quick']=(
    {'TerminalIPythonApp' : {'quick' : True}},
    "Enable quick startup with no config files."
)

frontend_flags['i'] = (
    {'TerminalIPythonApp' : {'force_interact' : True}},
    """If running code from the command line, become interactive afterwards.
    Note: can also be given simply as '-i.'"""
)
frontend_flags['pylab'] = (
    {'TerminalIPythonApp' : {'pylab' : 'auto'}},
    """Pre-load matplotlib and numpy for interactive use with
    the default matplotlib backend."""
)
flags.update(frontend_flags)

aliases = dict(base_aliases)
aliases.update(shell_aliases)

# it's possible we don't want short aliases for *all* of these:
aliases.update(dict(
    gui='TerminalIPythonApp.gui',
    pylab='TerminalIPythonApp.pylab',
))

#-----------------------------------------------------------------------------
# Main classes and functions
#-----------------------------------------------------------------------------

class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):
    name = u'ipython'
    description = usage.cl_usage
    default_config_file_name = default_config_file_name
    crash_handler_class = IPAppCrashHandler
    examples = _examples

    flags = Dict(flags)
    aliases = Dict(aliases)
    classes = List()
    def _classes_default(self):
        """This has to be in a method, for TerminalIPythonApp to be available."""
        return [
            InteractiveShellApp, # ShellApp comes before TerminalApp, because
            self.__class__,      # it will also affect subclasses (e.g. QtConsole)
            TerminalInteractiveShell,
            PromptManager,
            ProfileDir,
            PlainTextFormatter,
            IPCompleter,
        ]

    subcommands = Dict(dict(
        qtconsole=('IPython.frontend.qt.console.qtconsoleapp.IPythonQtConsoleApp',
            """Launch the IPython Qt Console."""
        ),
        notebook=('IPython.frontend.html.notebook.notebookapp.NotebookApp',
            """Launch the IPython HTML Notebook Server."""
        ),
        profile = ("IPython.core.profileapp.ProfileApp",
            "Create and manage IPython profiles."
        ),
        kernel = ("IPython.zmq.ipkernel.IPKernelApp",
            "Start a kernel without an attached frontend."
        ),
        console=('IPython.frontend.terminal.console.app.ZMQTerminalIPythonApp',
            """Launch the IPython terminal-based Console."""
        ),
    ))

    # *do* autocreate requested profile, but don't create the config file.
    auto_create=Bool(True)
    # configurables
    ignore_old_config=Bool(False, config=True,
        help="Suppress warning messages about legacy config files"
    )
    quick = Bool(False, config=True,
        help="""Start IPython quickly by skipping the loading of config files."""
    )
    def _quick_changed(self, name, old, new):
        if new:
            self.load_config_file = lambda *a, **kw: None
            self.ignore_old_config=True

    gui = CaselessStrEnum(('qt', 'wx', 'gtk', 'glut', 'pyglet'), config=True,
        help="Enable GUI event loop integration ('qt', 'wx', 'gtk', 'glut', 'pyglet')."
    )
    pylab = CaselessStrEnum(['tk', 'qt', 'wx', 'gtk', 'osx', 'auto'],
        config=True,
        help="""Pre-load matplotlib and numpy for interactive use,
        selecting a particular matplotlib backend and loop integration.
        """
    )
    display_banner = Bool(True, config=True,
        help="Whether to display a banner upon starting IPython."
    )

    # if there is code of files to run from the cmd line, don't interact
    # unless the --i flag (App.force_interact) is true.
    force_interact = Bool(False, config=True,
        help="""If a command or file is given via the command-line,
        e.g. 'ipython foo.py"""
    )
    def _force_interact_changed(self, name, old, new):
        if new:
            self.interact = True

    def _file_to_run_changed(self, name, old, new):
        if new:
            self.something_to_run = True
        if new and not self.force_interact:
                self.interact = False
    _code_to_run_changed = _file_to_run_changed
    _module_to_run_changed = _file_to_run_changed

    # internal, not-configurable
    interact=Bool(True)
    something_to_run=Bool(False)

    def parse_command_line(self, argv=None):
        """override to allow old '-pylab' flag with deprecation warning"""

        argv = sys.argv[1:] if argv is None else argv

        if '-pylab' in argv:
            # deprecated `-pylab` given,
            # warn and transform into current syntax
            argv = argv[:] # copy, don't clobber
            idx = argv.index('-pylab')
            warn.warn("`-pylab` flag has been deprecated.\n"
            "    Use `--pylab` instead, or `--pylab=foo` to specify a backend.")
            sub = '--pylab'
            if len(argv) > idx+1:
                # check for gui arg, as in '-pylab qt'
                gui = argv[idx+1]
                if gui in ('wx', 'qt', 'qt4', 'gtk', 'auto'):
                    sub = '--pylab='+gui
                    argv.pop(idx+1)
            argv[idx] = sub

        return super(TerminalIPythonApp, self).parse_command_line(argv)
    
    @catch_config_error
    def initialize(self, argv=None):
        """Do actions after construct, but before starting the app."""
        super(TerminalIPythonApp, self).initialize(argv)
        if self.subapp is not None:
            # don't bother initializing further, starting subapp
            return
        if not self.ignore_old_config:
            check_for_old_config(self.ipython_dir)
        # print self.extra_args
        if self.extra_args and not self.something_to_run:
            self.file_to_run = self.extra_args[0]
        # create the shell
        self.init_shell()
        # and draw the banner
        self.init_banner()
        # Now a variety of things that happen after the banner is printed.
        self.init_gui_pylab()
        self.init_extensions()
        self.init_code()

    def init_shell(self):
        """initialize the InteractiveShell instance"""
        # I am a little hesitant to put these into InteractiveShell itself.
        # But that might be the place for them
        sys.path.insert(0, '')

        # Create an InteractiveShell instance.
        # shell.display_banner should always be False for the terminal
        # based app, because we call shell.show_banner() by hand below
        # so the banner shows *before* all extension loading stuff.
        self.shell = TerminalInteractiveShell.instance(config=self.config,
                        display_banner=False, profile_dir=self.profile_dir,
                        ipython_dir=self.ipython_dir)
        self.shell.configurables.append(self)

    def init_banner(self):
        """optionally display the banner"""
        if self.display_banner and self.interact:
            self.shell.show_banner()
        # Make sure there is a space below the banner.
        if self.log_level <= logging.INFO: print


    def init_gui_pylab(self):
        """Enable GUI event loop integration, taking pylab into account."""
        gui = self.gui

        # Using `pylab` will also require gui activation, though which toolkit
        # to use may be chosen automatically based on mpl configuration.
        if self.pylab:
            activate = self.shell.enable_pylab
            if self.pylab == 'auto':
                gui = None
            else:
                gui = self.pylab
        else:
            # Enable only GUI integration, no pylab
            activate = inputhook.enable_gui

        if gui or self.pylab:
            try:
                self.log.info("Enabling GUI event loop integration, "
                              "toolkit=%s, pylab=%s" % (gui, self.pylab) )
                if self.pylab:
                    activate(gui, import_all=self.pylab_import_all)
                else:
                    activate(gui)
            except:
                self.log.warn("Error in enabling GUI event loop integration:")
                self.shell.showtraceback()

    def start(self):
        if self.subapp is not None:
            return self.subapp.start()
        # perform any prexec steps:
        if self.interact:
            self.log.debug("Starting IPython's mainloop...")
            self.shell.mainloop()
        else:
            self.log.debug("IPython not interactive...")


def load_default_config(ipython_dir=None):
    """Load the default config file from the default ipython_dir.

    This is useful for embedded shells.
    """
    if ipython_dir is None:
        ipython_dir = get_ipython_dir()
    profile_dir = os.path.join(ipython_dir, 'profile_default')
    cl = PyFileConfigLoader(default_config_file_name, profile_dir)
    try:
        config = cl.load_config()
    except ConfigFileNotFound:
        # no config found
        config = Config()
    return config


def launch_new_instance():
    """Create and run a full blown IPython instance"""
    app = TerminalIPythonApp.instance()
    app.initialize()
    app.start()


if __name__ == '__main__':
    launch_new_instance()