Mini Shell
# encoding: utf-8
"""
The :class:`~traitlets.config.application.Application` object for the command
line :command:`ipython` program.
"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
import logging
import os
import sys
import warnings
from traitlets.config.loader import Config
from traitlets.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.history import HistoryManager
from IPython.core.application import (
ProfileDir, BaseIPythonApplication, base_flags, base_aliases
)
from IPython.core.magic import MagicsManager
from IPython.core.magics import (
ScriptMagics, LoggingMagics
)
from IPython.core.shellapp import (
InteractiveShellApp, shell_flags, shell_aliases
)
from IPython.extensions.storemagic import StoreMagics
from .interactiveshell import TerminalInteractiveShell
from IPython.paths import get_ipython_dir
from traitlets import (
Bool, List, default, observe, Type
)
#-----------------------------------------------------------------------------
# Globals, utilities and helpers
#-----------------------------------------------------------------------------
_examples = """
ipython --matplotlib # enable matplotlib integration
ipython --matplotlib=qt # enable matplotlib integration with qt4 backend
ipython --log-level=DEBUG # set logging to DEBUG
ipython --profile=foo # start with profile foo
ipython profile create foo # create profile foo w/ default config files
ipython help profile # show the help for the profile subcmd
ipython locate # print the path to the IPython directory
ipython locate profile foo # print the path to the directory for profile `foo`
"""
#-----------------------------------------------------------------------------
# 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.author
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('simple-prompt', 'TerminalInteractiveShell.simple_prompt',
"Force simple minimal prompt using `raw_input`",
"Use a rich interactive prompt with prompt_toolkit",
)
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.TerminalInteractiveShell.prompts_class='IPython.terminal.prompts.ClassicPrompts'
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.
It is often useful to follow this with `--` to treat remaining flags as
script arguments.
"""
)
flags.update(frontend_flags)
aliases = dict(base_aliases)
aliases.update(shell_aliases) # type: ignore[arg-type]
#-----------------------------------------------------------------------------
# Main classes and functions
#-----------------------------------------------------------------------------
class LocateIPythonApp(BaseIPythonApplication):
description = """print the path to the IPython dir"""
subcommands = dict(
profile=('IPython.core.profileapp.ProfileLocate',
"print the path to an IPython profile directory",
),
)
def start(self):
if self.subapp is not None:
return self.subapp.start()
else:
print(self.ipython_dir)
class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):
name = u'ipython'
description = usage.cl_usage
crash_handler_class = IPAppCrashHandler # typing: ignore[assignment]
examples = _examples
flags = flags
aliases = aliases
classes = List()
interactive_shell_class = Type(
klass=object, # use default_value otherwise which only allow subclasses.
default_value=TerminalInteractiveShell,
help="Class to use to instantiate the TerminalInteractiveShell object. Useful for custom Frontends"
).tag(config=True)
@default('classes')
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,
HistoryManager,
MagicsManager,
ProfileDir,
PlainTextFormatter,
IPCompleter,
ScriptMagics,
LoggingMagics,
StoreMagics,
]
subcommands = dict(
profile = ("IPython.core.profileapp.ProfileApp",
"Create and manage IPython profiles."
),
kernel = ("ipykernel.kernelapp.IPKernelApp",
"Start a kernel without an attached frontend."
),
locate=('IPython.terminal.ipapp.LocateIPythonApp',
LocateIPythonApp.description
),
history=('IPython.core.historyapp.HistoryApp',
"Manage the IPython history database."
),
)
# *do* autocreate requested profile, but don't create the config file.
auto_create=Bool(True)
# configurables
quick = Bool(False,
help="""Start IPython quickly by skipping the loading of config files."""
).tag(config=True)
@observe('quick')
def _quick_changed(self, change):
if change['new']:
self.load_config_file = lambda *a, **kw: None
display_banner = Bool(True,
help="Whether to display a banner upon starting IPython."
).tag(config=True)
# 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,
help="""If a command or file is given via the command-line,
e.g. 'ipython foo.py', start an interactive shell after executing the
file or command."""
).tag(config=True)
@observe('force_interact')
def _force_interact_changed(self, change):
if change['new']:
self.interact = True
@observe('file_to_run', 'code_to_run', 'module_to_run')
def _file_to_run_changed(self, change):
new = change['new']
if new:
self.something_to_run = True
if new and not self.force_interact:
self.interact = False
# internal, not-configurable
something_to_run=Bool(False)
@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
# print self.extra_args
if self.extra_args and not self.something_to_run:
self.file_to_run = self.extra_args[0]
self.init_path()
# 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"""
# 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 = self.interactive_shell_class.instance(parent=self,
profile_dir=self.profile_dir,
ipython_dir=self.ipython_dir, user_ns=self.user_ns)
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 _pylab_changed(self, name, old, new):
"""Replace --pylab='inline' with --pylab='auto'"""
if new == 'inline':
warnings.warn("'inline' not available as pylab backend, "
"using 'auto' instead.")
self.pylab = 'auto'
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...")
self.shell.restore_term_title()
if not self.shell.last_execution_succeeded:
sys.exit(1)
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')
app = TerminalIPythonApp()
app.config_file_paths.append(profile_dir)
app.load_config_file()
return app.config
launch_new_instance = TerminalIPythonApp.launch_instance
Zerion Mini Shell 1.0