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#!/usr/bin/env python
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# encoding: utf-8
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"""
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The :class:`~IPython.core.application.Application` object for the command
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line :command:`ipython` program.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import logging
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import os
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import sys
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import warnings
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from traitlets.config.loader import Config
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from traitlets.config.application import boolean_flag, catch_config_error
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from IPython.core import release
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from IPython.core import usage
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from IPython.core.completer import IPCompleter
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from IPython.core.crashhandler import CrashHandler
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from IPython.core.formatters import PlainTextFormatter
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from IPython.core.history import HistoryManager
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from IPython.core.application import (
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ProfileDir, BaseIPythonApplication, base_flags, base_aliases
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)
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from IPython.core.magics import (
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ScriptMagics, LoggingMagics
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)
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from IPython.core.shellapp import (
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InteractiveShellApp, shell_flags, shell_aliases
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)
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from IPython.extensions.storemagic import StoreMagics
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from .interactiveshell import TerminalInteractiveShell
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from IPython.paths import get_ipython_dir
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from traitlets import (
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Bool, List, default, observe, Type
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)
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#-----------------------------------------------------------------------------
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# Globals, utilities and helpers
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#-----------------------------------------------------------------------------
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_examples = """
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ipython --matplotlib # enable matplotlib integration
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ipython --matplotlib=qt # enable matplotlib integration with qt4 backend
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ipython --log-level=DEBUG # set logging to DEBUG
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ipython --profile=foo # start with profile foo
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ipython profile create foo # create profile foo w/ default config files
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ipython help profile # show the help for the profile subcmd
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ipython locate # print the path to the IPython directory
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ipython locate profile foo # print the path to the directory for profile `foo`
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"""
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#-----------------------------------------------------------------------------
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# Crash handler for this application
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#-----------------------------------------------------------------------------
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class IPAppCrashHandler(CrashHandler):
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"""sys.excepthook for IPython itself, leaves a detailed report on disk."""
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def __init__(self, app):
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contact_name = release.author
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contact_email = release.author_email
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bug_tracker = 'https://github.com/ipython/ipython/issues'
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super(IPAppCrashHandler,self).__init__(
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app, contact_name, contact_email, bug_tracker
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)
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def make_report(self,traceback):
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"""Return a string containing a crash report."""
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sec_sep = self.section_sep
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# Start with parent report
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report = [super(IPAppCrashHandler, self).make_report(traceback)]
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# Add interactive-specific info we may have
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rpt_add = report.append
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try:
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rpt_add(sec_sep+"History of session input:")
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for line in self.app.shell.user_ns['_ih']:
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rpt_add(line)
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rpt_add('\n*** Last line of input (may not be in above history):\n')
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rpt_add(self.app.shell._last_input_line+'\n')
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except:
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pass
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return ''.join(report)
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#-----------------------------------------------------------------------------
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# Aliases and Flags
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#-----------------------------------------------------------------------------
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flags = dict(base_flags)
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flags.update(shell_flags)
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frontend_flags = {}
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addflag = lambda *args: frontend_flags.update(boolean_flag(*args))
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addflag('autoedit-syntax', 'TerminalInteractiveShell.autoedit_syntax',
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'Turn on auto editing of files with syntax errors.',
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'Turn off auto editing of files with syntax errors.'
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)
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addflag('simple-prompt', 'TerminalInteractiveShell.simple_prompt',
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"Force simple minimal prompt using `raw_input`",
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"Use a rich interactive prompt with prompt_toolkit",
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)
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addflag('banner', 'TerminalIPythonApp.display_banner',
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"Display a banner upon starting IPython.",
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"Don't display a banner upon starting IPython."
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)
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addflag('confirm-exit', 'TerminalInteractiveShell.confirm_exit',
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"""Set to confirm when you try to exit IPython with an EOF (Control-D
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in Unix, Control-Z/Enter in Windows). By typing 'exit' or 'quit',
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you can force a direct exit without any confirmation.""",
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"Don't prompt the user when exiting."
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)
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addflag('term-title', 'TerminalInteractiveShell.term_title',
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"Enable auto setting the terminal title.",
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"Disable auto setting the terminal title."
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)
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classic_config = Config()
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classic_config.InteractiveShell.cache_size = 0
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classic_config.PlainTextFormatter.pprint = False
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classic_config.TerminalInteractiveShell.prompts_class='IPython.terminal.prompts.ClassicPrompts'
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classic_config.InteractiveShell.separate_in = ''
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classic_config.InteractiveShell.separate_out = ''
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classic_config.InteractiveShell.separate_out2 = ''
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classic_config.InteractiveShell.colors = 'NoColor'
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classic_config.InteractiveShell.xmode = 'Plain'
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frontend_flags['classic']=(
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classic_config,
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"Gives IPython a similar feel to the classic Python prompt."
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)
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# # log doesn't make so much sense this way anymore
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# paa('--log','-l',
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# action='store_true', dest='InteractiveShell.logstart',
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# help="Start logging to the default log file (./ipython_log.py).")
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#
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# # quick is harder to implement
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frontend_flags['quick']=(
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{'TerminalIPythonApp' : {'quick' : True}},
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"Enable quick startup with no config files."
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)
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frontend_flags['i'] = (
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{'TerminalIPythonApp' : {'force_interact' : True}},
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"""If running code from the command line, become interactive afterwards.
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It is often useful to follow this with `--` to treat remaining flags as
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script arguments.
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"""
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)
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flags.update(frontend_flags)
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aliases = dict(base_aliases)
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aliases.update(shell_aliases)
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#-----------------------------------------------------------------------------
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# Main classes and functions
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#-----------------------------------------------------------------------------
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class LocateIPythonApp(BaseIPythonApplication):
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description = """print the path to the IPython dir"""
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subcommands = dict(
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profile=('IPython.core.profileapp.ProfileLocate',
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"print the path to an IPython profile directory",
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),
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)
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def start(self):
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if self.subapp is not None:
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return self.subapp.start()
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else:
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print(self.ipython_dir)
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class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):
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name = u'ipython'
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description = usage.cl_usage
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crash_handler_class = IPAppCrashHandler
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examples = _examples
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flags = flags
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aliases = aliases
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classes = List()
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interactive_shell_class = Type(
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klass=object, # use default_value otherwise which only allow subclasses.
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default_value=TerminalInteractiveShell,
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help="Class to use to instantiate the TerminalInteractiveShell object. Useful for custom Frontends"
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).tag(config=True)
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@default('classes')
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def _classes_default(self):
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"""This has to be in a method, for TerminalIPythonApp to be available."""
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return [
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InteractiveShellApp, # ShellApp comes before TerminalApp, because
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self.__class__, # it will also affect subclasses (e.g. QtConsole)
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TerminalInteractiveShell,
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HistoryManager,
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ProfileDir,
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PlainTextFormatter,
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IPCompleter,
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ScriptMagics,
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LoggingMagics,
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StoreMagics,
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]
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subcommands = dict(
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profile = ("IPython.core.profileapp.ProfileApp",
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"Create and manage IPython profiles."
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),
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kernel = ("ipykernel.kernelapp.IPKernelApp",
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"Start a kernel without an attached frontend."
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),
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locate=('IPython.terminal.ipapp.LocateIPythonApp',
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LocateIPythonApp.description
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),
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history=('IPython.core.historyapp.HistoryApp',
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"Manage the IPython history database."
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),
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)
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# *do* autocreate requested profile, but don't create the config file.
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auto_create=Bool(True)
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# configurables
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quick = Bool(False,
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help="""Start IPython quickly by skipping the loading of config files."""
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).tag(config=True)
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@observe('quick')
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def _quick_changed(self, change):
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if change['new']:
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self.load_config_file = lambda *a, **kw: None
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display_banner = Bool(True,
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help="Whether to display a banner upon starting IPython."
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).tag(config=True)
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# if there is code of files to run from the cmd line, don't interact
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# unless the --i flag (App.force_interact) is true.
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force_interact = Bool(False,
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help="""If a command or file is given via the command-line,
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e.g. 'ipython foo.py', start an interactive shell after executing the
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file or command."""
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).tag(config=True)
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@observe('force_interact')
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def _force_interact_changed(self, change):
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if change['new']:
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self.interact = True
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@observe('file_to_run', 'code_to_run', 'module_to_run')
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def _file_to_run_changed(self, change):
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new = change['new']
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if new:
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self.something_to_run = True
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if new and not self.force_interact:
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self.interact = False
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# internal, not-configurable
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something_to_run=Bool(False)
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def parse_command_line(self, argv=None):
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"""override to allow old '-pylab' flag with deprecation warning"""
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argv = sys.argv[1:] if argv is None else argv
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if '-pylab' in argv:
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# deprecated `-pylab` given,
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# warn and transform into current syntax
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argv = argv[:] # copy, don't clobber
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idx = argv.index('-pylab')
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warnings.warn("`-pylab` flag has been deprecated.\n"
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" Use `--matplotlib <backend>` and import pylab manually.")
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argv[idx] = '--pylab'
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return super(TerminalIPythonApp, self).parse_command_line(argv)
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@catch_config_error
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def initialize(self, argv=None):
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"""Do actions after construct, but before starting the app."""
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super(TerminalIPythonApp, self).initialize(argv)
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if self.subapp is not None:
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# don't bother initializing further, starting subapp
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return
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# print self.extra_args
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if self.extra_args and not self.something_to_run:
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self.file_to_run = self.extra_args[0]
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self.init_path()
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# create the shell
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self.init_shell()
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# and draw the banner
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self.init_banner()
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# Now a variety of things that happen after the banner is printed.
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self.init_gui_pylab()
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self.init_extensions()
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self.init_code()
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def init_shell(self):
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"""initialize the InteractiveShell instance"""
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# Create an InteractiveShell instance.
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# shell.display_banner should always be False for the terminal
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# based app, because we call shell.show_banner() by hand below
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# so the banner shows *before* all extension loading stuff.
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self.shell = self.interactive_shell_class.instance(parent=self,
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profile_dir=self.profile_dir,
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ipython_dir=self.ipython_dir, user_ns=self.user_ns)
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self.shell.configurables.append(self)
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def init_banner(self):
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"""optionally display the banner"""
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if self.display_banner and self.interact:
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self.shell.show_banner()
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# Make sure there is a space below the banner.
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if self.log_level <= logging.INFO: print()
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def _pylab_changed(self, name, old, new):
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"""Replace --pylab='inline' with --pylab='auto'"""
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if new == 'inline':
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warnings.warn("'inline' not available as pylab backend, "
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"using 'auto' instead.")
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self.pylab = 'auto'
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def start(self):
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if self.subapp is not None:
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return self.subapp.start()
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# perform any prexec steps:
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if self.interact:
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self.log.debug("Starting IPython's mainloop...")
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self.shell.mainloop()
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else:
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self.log.debug("IPython not interactive...")
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if not self.shell.last_execution_succeeded:
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sys.exit(1)
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def load_default_config(ipython_dir=None):
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"""Load the default config file from the default ipython_dir.
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This is useful for embedded shells.
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"""
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if ipython_dir is None:
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ipython_dir = get_ipython_dir()
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profile_dir = os.path.join(ipython_dir, 'profile_default')
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app = TerminalIPythonApp()
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app.config_file_paths.append(profile_dir)
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app.load_config_file()
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return app.config
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launch_new_instance = TerminalIPythonApp.launch_instance
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if __name__ == '__main__':
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launch_new_instance()
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