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# -*- coding: utf-8 -*-
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"""Subclass of InteractiveShell for terminal based frontends."""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2001 Janko Hauser <jhauser@zscout.de>
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# Copyright (C) 2001-2007 Fernando Perez. <fperez@colorado.edu>
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import __builtin__
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import bdb
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import os
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import re
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import sys
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import textwrap
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try:
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from contextlib import nested
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except:
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from IPython.utils.nested_context import nested
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from IPython.core.error import TryNext
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from IPython.core.usage import interactive_usage, default_banner
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from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
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from IPython.core.pylabtools import pylab_activate
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from IPython.testing.skipdoctest import skip_doctest
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from IPython.utils import py3compat
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from IPython.utils.terminal import toggle_set_term_title, set_term_title
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from IPython.utils.process import abbrev_cwd
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from IPython.utils.warn import warn, error
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from IPython.utils.text import num_ini_spaces, SList
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from IPython.utils.traitlets import Integer, CBool, Unicode
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#-----------------------------------------------------------------------------
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# Utilities
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#-----------------------------------------------------------------------------
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def get_default_editor():
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try:
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ed = os.environ['EDITOR']
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except KeyError:
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if os.name == 'posix':
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ed = 'vi' # the only one guaranteed to be there!
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else:
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ed = 'notepad' # same in Windows!
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return ed
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def get_pasted_lines(sentinel, l_input=py3compat.input):
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""" Yield pasted lines until the user enters the given sentinel value.
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"""
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print "Pasting code; enter '%s' alone on the line to stop or use Ctrl-D." \
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% sentinel
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while True:
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try:
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l = l_input(':')
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if l == sentinel:
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return
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else:
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yield l
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except EOFError:
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print '<EOF>'
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return
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def strip_email_quotes(raw_lines):
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""" Strip email quotation marks at the beginning of each line.
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We don't do any more input transofrmations here because the main shell's
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prefiltering handles other cases.
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"""
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lines = [re.sub(r'^\s*(\s?>)+', '', l) for l in raw_lines]
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return '\n'.join(lines) + '\n'
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# These two functions are needed by the %paste/%cpaste magics. In practice
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# they are basically methods (they take the shell as their first argument), but
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# we leave them as standalone functions because eventually the magics
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# themselves will become separate objects altogether. At that point, the
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# magics will have access to the shell object, and these functions can be made
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# methods of the magic object, but not of the shell.
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def store_or_execute(shell, block, name):
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""" Execute a block, or store it in a variable, per the user's request.
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"""
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# Dedent and prefilter so what we store matches what is executed by
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# run_cell.
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b = shell.prefilter(textwrap.dedent(block))
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if name:
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# If storing it for further editing, run the prefilter on it
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shell.user_ns[name] = SList(b.splitlines())
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print "Block assigned to '%s'" % name
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else:
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shell.user_ns['pasted_block'] = b
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shell.run_cell(b)
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def rerun_pasted(shell, name='pasted_block'):
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""" Rerun a previously pasted command.
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"""
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b = shell.user_ns.get(name)
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# Sanity checks
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if b is None:
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raise UsageError('No previous pasted block available')
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if not isinstance(b, basestring):
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raise UsageError(
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"Variable 'pasted_block' is not a string, can't execute")
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print "Re-executing '%s...' (%d chars)"% (b.split('\n',1)[0], len(b))
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shell.run_cell(b)
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#-----------------------------------------------------------------------------
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# Main class
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#-----------------------------------------------------------------------------
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class TerminalInteractiveShell(InteractiveShell):
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autoedit_syntax = CBool(False, config=True,
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help="auto editing of files with syntax errors.")
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banner = Unicode('')
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banner1 = Unicode(default_banner, config=True,
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help="""The part of the banner to be printed before the profile"""
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)
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banner2 = Unicode('', config=True,
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help="""The part of the banner to be printed after the profile"""
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)
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confirm_exit = CBool(True, config=True,
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help="""
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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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)
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# This display_banner only controls whether or not self.show_banner()
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# is called when mainloop/interact are called. The default is False
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# because for the terminal based application, the banner behavior
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# is controlled by Global.display_banner, which IPythonApp looks at
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# to determine if *it* should call show_banner() by hand or not.
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display_banner = CBool(False) # This isn't configurable!
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embedded = CBool(False)
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embedded_active = CBool(False)
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editor = Unicode(get_default_editor(), config=True,
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help="Set the editor used by IPython (default to $EDITOR/vi/notepad)."
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)
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pager = Unicode('less', config=True,
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help="The shell program to be used for paging.")
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screen_length = Integer(0, config=True,
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help=
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"""Number of lines of your screen, used to control printing of very
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long strings. Strings longer than this number of lines will be sent
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through a pager instead of directly printed. The default value for
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this is 0, which means IPython will auto-detect your screen size every
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time it needs to print certain potentially long strings (this doesn't
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change the behavior of the 'print' keyword, it's only triggered
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internally). If for some reason this isn't working well (it needs
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curses support), specify it yourself. Otherwise don't change the
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default.""",
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)
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term_title = CBool(False, config=True,
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help="Enable auto setting the terminal title."
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)
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# In the terminal, GUI control is done via PyOS_InputHook
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from IPython.lib.inputhook import enable_gui
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enable_gui = staticmethod(enable_gui)
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def __init__(self, config=None, ipython_dir=None, profile_dir=None,
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user_ns=None, user_module=None, custom_exceptions=((),None),
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usage=None, banner1=None, banner2=None, display_banner=None):
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super(TerminalInteractiveShell, self).__init__(
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config=config, profile_dir=profile_dir, user_ns=user_ns,
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user_module=user_module, custom_exceptions=custom_exceptions
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)
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# use os.system instead of utils.process.system by default,
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# because piped system doesn't make sense in the Terminal:
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self.system = self.system_raw
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self.init_term_title()
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self.init_usage(usage)
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self.init_banner(banner1, banner2, display_banner)
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#-------------------------------------------------------------------------
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# Things related to the terminal
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#-------------------------------------------------------------------------
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@property
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def usable_screen_length(self):
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if self.screen_length == 0:
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return 0
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else:
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num_lines_bot = self.separate_in.count('\n')+1
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return self.screen_length - num_lines_bot
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def init_term_title(self):
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# Enable or disable the terminal title.
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if self.term_title:
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toggle_set_term_title(True)
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set_term_title('IPython: ' + abbrev_cwd())
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else:
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toggle_set_term_title(False)
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#-------------------------------------------------------------------------
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# Things related to aliases
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#-------------------------------------------------------------------------
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def init_alias(self):
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# The parent class defines aliases that can be safely used with any
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# frontend.
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super(TerminalInteractiveShell, self).init_alias()
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# Now define aliases that only make sense on the terminal, because they
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# need direct access to the console in a way that we can't emulate in
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# GUI or web frontend
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if os.name == 'posix':
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aliases = [('clear', 'clear'), ('more', 'more'), ('less', 'less'),
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('man', 'man')]
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elif os.name == 'nt':
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aliases = [('cls', 'cls')]
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for name, cmd in aliases:
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self.alias_manager.define_alias(name, cmd)
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#-------------------------------------------------------------------------
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# Things related to the banner and usage
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#-------------------------------------------------------------------------
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def _banner1_changed(self):
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self.compute_banner()
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def _banner2_changed(self):
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self.compute_banner()
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def _term_title_changed(self, name, new_value):
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self.init_term_title()
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def init_banner(self, banner1, banner2, display_banner):
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if banner1 is not None:
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self.banner1 = banner1
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if banner2 is not None:
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self.banner2 = banner2
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if display_banner is not None:
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self.display_banner = display_banner
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self.compute_banner()
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def show_banner(self, banner=None):
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if banner is None:
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banner = self.banner
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self.write(banner)
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def compute_banner(self):
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self.banner = self.banner1
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if self.profile and self.profile != 'default':
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self.banner += '\nIPython profile: %s\n' % self.profile
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if self.banner2:
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self.banner += '\n' + self.banner2
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def init_usage(self, usage=None):
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if usage is None:
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self.usage = interactive_usage
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else:
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self.usage = usage
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#-------------------------------------------------------------------------
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# Mainloop and code execution logic
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#-------------------------------------------------------------------------
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def mainloop(self, display_banner=None):
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"""Start the mainloop.
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If an optional banner argument is given, it will override the
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internally created default banner.
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"""
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with nested(self.builtin_trap, self.display_trap):
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while 1:
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try:
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self.interact(display_banner=display_banner)
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#self.interact_with_readline()
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# XXX for testing of a readline-decoupled repl loop, call
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# interact_with_readline above
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break
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except KeyboardInterrupt:
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# this should not be necessary, but KeyboardInterrupt
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# handling seems rather unpredictable...
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self.write("\nKeyboardInterrupt in interact()\n")
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def _replace_rlhist_multiline(self, source_raw, hlen_before_cell):
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"""Store multiple lines as a single entry in history"""
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# do nothing without readline or disabled multiline
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if not self.has_readline or not self.multiline_history:
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return hlen_before_cell
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# windows rl has no remove_history_item
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if not hasattr(self.readline, "remove_history_item"):
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return hlen_before_cell
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# skip empty cells
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if not source_raw.rstrip():
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return hlen_before_cell
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# nothing changed do nothing, e.g. when rl removes consecutive dups
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hlen = self.readline.get_current_history_length()
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if hlen == hlen_before_cell:
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return hlen_before_cell
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for i in range(hlen - hlen_before_cell):
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self.readline.remove_history_item(hlen - i - 1)
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stdin_encoding = sys.stdin.encoding or "utf-8"
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self.readline.add_history(py3compat.unicode_to_str(source_raw.rstrip(),
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stdin_encoding))
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return self.readline.get_current_history_length()
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def interact(self, display_banner=None):
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"""Closely emulate the interactive Python console."""
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# batch run -> do not interact
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if self.exit_now:
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return
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if display_banner is None:
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display_banner = self.display_banner
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if isinstance(display_banner, basestring):
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self.show_banner(display_banner)
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elif display_banner:
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self.show_banner()
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more = False
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# Mark activity in the builtins
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__builtin__.__dict__['__IPYTHON__active'] += 1
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if self.has_readline:
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self.readline_startup_hook(self.pre_readline)
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hlen_b4_cell = self.readline.get_current_history_length()
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else:
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hlen_b4_cell = 0
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# exit_now is set by a call to %Exit or %Quit, through the
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# ask_exit callback.
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while not self.exit_now:
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self.hooks.pre_prompt_hook()
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if more:
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try:
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prompt = self.hooks.generate_prompt(True)
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except:
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self.showtraceback()
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if self.autoindent:
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self.rl_do_indent = True
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else:
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try:
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prompt = self.hooks.generate_prompt(False)
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except:
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self.showtraceback()
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try:
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line = self.raw_input(prompt)
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if self.exit_now:
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# quick exit on sys.std[in|out] close
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break
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if self.autoindent:
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self.rl_do_indent = False
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except KeyboardInterrupt:
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#double-guard against keyboardinterrupts during kbdint handling
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try:
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self.write('\nKeyboardInterrupt\n')
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source_raw = self.input_splitter.source_raw_reset()[1]
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hlen_b4_cell = \
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self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
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more = False
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except KeyboardInterrupt:
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pass
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except EOFError:
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if self.autoindent:
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self.rl_do_indent = False
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if self.has_readline:
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self.readline_startup_hook(None)
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self.write('\n')
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self.exit()
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except bdb.BdbQuit:
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warn('The Python debugger has exited with a BdbQuit exception.\n'
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'Because of how pdb handles the stack, it is impossible\n'
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'for IPython to properly format this particular exception.\n'
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'IPython will resume normal operation.')
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except:
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# exceptions here are VERY RARE, but they can be triggered
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# asynchronously by signal handlers, for example.
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self.showtraceback()
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else:
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self.input_splitter.push(line)
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more = self.input_splitter.push_accepts_more()
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if (self.SyntaxTB.last_syntax_error and
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self.autoedit_syntax):
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self.edit_syntax_error()
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if not more:
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source_raw = self.input_splitter.source_raw_reset()[1]
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self.run_cell(source_raw, store_history=True)
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hlen_b4_cell = \
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self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
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# We are off again...
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__builtin__.__dict__['__IPYTHON__active'] -= 1
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# Turn off the exit flag, so the mainloop can be restarted if desired
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self.exit_now = False
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def raw_input(self, prompt=''):
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"""Write a prompt and read a line.
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The returned line does not include the trailing newline.
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When the user enters the EOF key sequence, EOFError is raised.
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Optional inputs:
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- prompt(''): a string to be printed to prompt the user.
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- continue_prompt(False): whether this line is the first one or a
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continuation in a sequence of inputs.
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"""
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# Code run by the user may have modified the readline completer state.
|
|
|
# We must ensure that our completer is back in place.
|
|
|
|
|
|
if self.has_readline:
|
|
|
self.set_readline_completer()
|
|
|
|
|
|
try:
|
|
|
line = py3compat.str_to_unicode(self.raw_input_original(prompt))
|
|
|
except ValueError:
|
|
|
warn("\n********\nYou or a %run:ed script called sys.stdin.close()"
|
|
|
" or sys.stdout.close()!\nExiting IPython!")
|
|
|
self.ask_exit()
|
|
|
return ""
|
|
|
|
|
|
# Try to be reasonably smart about not re-indenting pasted input more
|
|
|
# than necessary. We do this by trimming out the auto-indent initial
|
|
|
# spaces, if the user's actual input started itself with whitespace.
|
|
|
if self.autoindent:
|
|
|
if num_ini_spaces(line) > self.indent_current_nsp:
|
|
|
line = line[self.indent_current_nsp:]
|
|
|
self.indent_current_nsp = 0
|
|
|
|
|
|
return line
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Methods to support auto-editing of SyntaxErrors.
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def edit_syntax_error(self):
|
|
|
"""The bottom half of the syntax error handler called in the main loop.
|
|
|
|
|
|
Loop until syntax error is fixed or user cancels.
|
|
|
"""
|
|
|
|
|
|
while self.SyntaxTB.last_syntax_error:
|
|
|
# copy and clear last_syntax_error
|
|
|
err = self.SyntaxTB.clear_err_state()
|
|
|
if not self._should_recompile(err):
|
|
|
return
|
|
|
try:
|
|
|
# may set last_syntax_error again if a SyntaxError is raised
|
|
|
self.safe_execfile(err.filename,self.user_ns)
|
|
|
except:
|
|
|
self.showtraceback()
|
|
|
else:
|
|
|
try:
|
|
|
f = file(err.filename)
|
|
|
try:
|
|
|
# This should be inside a display_trap block and I
|
|
|
# think it is.
|
|
|
sys.displayhook(f.read())
|
|
|
finally:
|
|
|
f.close()
|
|
|
except:
|
|
|
self.showtraceback()
|
|
|
|
|
|
def _should_recompile(self,e):
|
|
|
"""Utility routine for edit_syntax_error"""
|
|
|
|
|
|
if e.filename in ('<ipython console>','<input>','<string>',
|
|
|
'<console>','<BackgroundJob compilation>',
|
|
|
None):
|
|
|
|
|
|
return False
|
|
|
try:
|
|
|
if (self.autoedit_syntax and
|
|
|
not self.ask_yes_no('Return to editor to correct syntax error? '
|
|
|
'[Y/n] ','y')):
|
|
|
return False
|
|
|
except EOFError:
|
|
|
return False
|
|
|
|
|
|
def int0(x):
|
|
|
try:
|
|
|
return int(x)
|
|
|
except TypeError:
|
|
|
return 0
|
|
|
# always pass integer line and offset values to editor hook
|
|
|
try:
|
|
|
self.hooks.fix_error_editor(e.filename,
|
|
|
int0(e.lineno),int0(e.offset),e.msg)
|
|
|
except TryNext:
|
|
|
warn('Could not open editor')
|
|
|
return False
|
|
|
return True
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Things related to exiting
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def ask_exit(self):
|
|
|
""" Ask the shell to exit. Can be overiden and used as a callback. """
|
|
|
self.exit_now = True
|
|
|
|
|
|
def exit(self):
|
|
|
"""Handle interactive exit.
|
|
|
|
|
|
This method calls the ask_exit callback."""
|
|
|
if self.confirm_exit:
|
|
|
if self.ask_yes_no('Do you really want to exit ([y]/n)?','y'):
|
|
|
self.ask_exit()
|
|
|
else:
|
|
|
self.ask_exit()
|
|
|
|
|
|
#------------------------------------------------------------------------
|
|
|
# Magic overrides
|
|
|
#------------------------------------------------------------------------
|
|
|
# Once the base class stops inheriting from magic, this code needs to be
|
|
|
# moved into a separate machinery as well. For now, at least isolate here
|
|
|
# the magics which this class needs to implement differently from the base
|
|
|
# class, or that are unique to it.
|
|
|
|
|
|
def magic_autoindent(self, parameter_s = ''):
|
|
|
"""Toggle autoindent on/off (if available)."""
|
|
|
|
|
|
self.shell.set_autoindent()
|
|
|
print "Automatic indentation is:",['OFF','ON'][self.shell.autoindent]
|
|
|
|
|
|
@skip_doctest
|
|
|
def magic_cpaste(self, parameter_s=''):
|
|
|
"""Paste & execute a pre-formatted code block from clipboard.
|
|
|
|
|
|
You must terminate the block with '--' (two minus-signs) or Ctrl-D
|
|
|
alone on the line. You can also provide your own sentinel with '%paste
|
|
|
-s %%' ('%%' is the new sentinel for this operation)
|
|
|
|
|
|
The block is dedented prior to execution to enable execution of method
|
|
|
definitions. '>' and '+' characters at the beginning of a line are
|
|
|
ignored, to allow pasting directly from e-mails, diff files and
|
|
|
doctests (the '...' continuation prompt is also stripped). The
|
|
|
executed block is also assigned to variable named 'pasted_block' for
|
|
|
later editing with '%edit pasted_block'.
|
|
|
|
|
|
You can also pass a variable name as an argument, e.g. '%cpaste foo'.
|
|
|
This assigns the pasted block to variable 'foo' as string, without
|
|
|
dedenting or executing it (preceding >>> and + is still stripped)
|
|
|
|
|
|
'%cpaste -r' re-executes the block previously entered by cpaste.
|
|
|
|
|
|
Do not be alarmed by garbled output on Windows (it's a readline bug).
|
|
|
Just press enter and type -- (and press enter again) and the block
|
|
|
will be what was just pasted.
|
|
|
|
|
|
IPython statements (magics, shell escapes) are not supported (yet).
|
|
|
|
|
|
See also
|
|
|
--------
|
|
|
paste: automatically pull code from clipboard.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
::
|
|
|
|
|
|
In [8]: %cpaste
|
|
|
Pasting code; enter '--' alone on the line to stop.
|
|
|
:>>> a = ["world!", "Hello"]
|
|
|
:>>> print " ".join(sorted(a))
|
|
|
:--
|
|
|
Hello world!
|
|
|
"""
|
|
|
|
|
|
opts, name = self.parse_options(parameter_s, 'rs:', mode='string')
|
|
|
if 'r' in opts:
|
|
|
rerun_pasted(self.shell)
|
|
|
return
|
|
|
|
|
|
sentinel = opts.get('s', '--')
|
|
|
block = strip_email_quotes(get_pasted_lines(sentinel))
|
|
|
store_or_execute(self.shell, block, name)
|
|
|
|
|
|
def magic_paste(self, parameter_s=''):
|
|
|
"""Paste & execute a pre-formatted code block from clipboard.
|
|
|
|
|
|
The text is pulled directly from the clipboard without user
|
|
|
intervention and printed back on the screen before execution (unless
|
|
|
the -q flag is given to force quiet mode).
|
|
|
|
|
|
The block is dedented prior to execution to enable execution of method
|
|
|
definitions. '>' and '+' characters at the beginning of a line are
|
|
|
ignored, to allow pasting directly from e-mails, diff files and
|
|
|
doctests (the '...' continuation prompt is also stripped). The
|
|
|
executed block is also assigned to variable named 'pasted_block' for
|
|
|
later editing with '%edit pasted_block'.
|
|
|
|
|
|
You can also pass a variable name as an argument, e.g. '%paste foo'.
|
|
|
This assigns the pasted block to variable 'foo' as string, without
|
|
|
dedenting or executing it (preceding >>> and + is still stripped)
|
|
|
|
|
|
Options
|
|
|
-------
|
|
|
|
|
|
-r: re-executes the block previously entered by cpaste.
|
|
|
|
|
|
-q: quiet mode: do not echo the pasted text back to the terminal.
|
|
|
|
|
|
IPython statements (magics, shell escapes) are not supported (yet).
|
|
|
|
|
|
See also
|
|
|
--------
|
|
|
cpaste: manually paste code into terminal until you mark its end.
|
|
|
"""
|
|
|
opts, name = self.parse_options(parameter_s, 'rq', mode='string')
|
|
|
if 'r' in opts:
|
|
|
rerun_pasted(self.shell)
|
|
|
return
|
|
|
try:
|
|
|
text = self.shell.hooks.clipboard_get()
|
|
|
block = strip_email_quotes(text.splitlines())
|
|
|
except TryNext as clipboard_exc:
|
|
|
message = getattr(clipboard_exc, 'args')
|
|
|
if message:
|
|
|
error(message[0])
|
|
|
else:
|
|
|
error('Could not get text from the clipboard.')
|
|
|
return
|
|
|
|
|
|
# By default, echo back to terminal unless quiet mode is requested
|
|
|
if 'q' not in opts:
|
|
|
write = self.shell.write
|
|
|
write(self.shell.pycolorize(block))
|
|
|
if not block.endswith('\n'):
|
|
|
write('\n')
|
|
|
write("## -- End pasted text --\n")
|
|
|
|
|
|
store_or_execute(self.shell, block, name)
|
|
|
|
|
|
# Class-level: add a '%cls' magic only on Windows
|
|
|
if sys.platform == 'win32':
|
|
|
def magic_cls(self, s):
|
|
|
"""Clear screen.
|
|
|
"""
|
|
|
os.system("cls")
|
|
|
|
|
|
def showindentationerror(self):
|
|
|
super(TerminalInteractiveShell, self).showindentationerror()
|
|
|
print("If you want to paste code into IPython, try the "
|
|
|
"%paste and %cpaste magic functions.")
|
|
|
|
|
|
|
|
|
InteractiveShellABC.register(TerminalInteractiveShell)
|
|
|
|
