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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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from __future__ import print_function
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import bdb
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import os
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import sys
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from IPython.core.error import TryNext, UsageError
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from IPython.core.usage import interactive_usage
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from IPython.core.inputsplitter import IPythonInputSplitter
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from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
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from IPython.core.magic import Magics, magics_class, line_magic
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from IPython.lib.clipboard import ClipboardEmpty
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from IPython.utils.encoding import get_stream_enc
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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, strip_email_quotes
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from 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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if not py3compat.PY3:
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ed = ed.decode()
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return ed
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except KeyError:
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pass
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except UnicodeError:
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warn("$EDITOR environment variable is not pure ASCII. Using platform "
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"default editor.")
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if os.name == 'posix':
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return 'vi' # the only one guaranteed to be there!
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else:
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return 'notepad' # same in Windows!
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def get_pasted_lines(sentinel, l_input=py3compat.input, quiet=False):
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""" Yield pasted lines until the user enters the given sentinel value.
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"""
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if not quiet:
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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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prompt = ":"
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else:
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prompt = ""
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while True:
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try:
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l = py3compat.str_to_unicode(l_input(prompt))
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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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#------------------------------------------------------------------------
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# Terminal-specific magics
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#------------------------------------------------------------------------
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@magics_class
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class TerminalMagics(Magics):
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def __init__(self, shell):
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super(TerminalMagics, self).__init__(shell)
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self.input_splitter = IPythonInputSplitter()
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def store_or_execute(self, 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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if name:
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# If storing it for further editing
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self.shell.user_ns[name] = SList(block.splitlines())
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print("Block assigned to '%s'" % name)
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else:
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b = self.preclean_input(block)
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self.shell.user_ns['pasted_block'] = b
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self.shell.using_paste_magics = True
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try:
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self.shell.run_cell(b)
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finally:
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self.shell.using_paste_magics = False
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def preclean_input(self, block):
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lines = block.splitlines()
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while lines and not lines[0].strip():
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lines = lines[1:]
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return strip_email_quotes('\n'.join(lines))
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def rerun_pasted(self, name='pasted_block'):
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""" Rerun a previously pasted command.
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"""
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b = self.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, py3compat.string_types):
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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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self.shell.run_cell(b)
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@line_magic
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def autoindent(self, parameter_s = ''):
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"""Toggle autoindent on/off (if available)."""
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self.shell.set_autoindent()
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print("Automatic indentation is:",['OFF','ON'][self.shell.autoindent])
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@line_magic
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def cpaste(self, parameter_s=''):
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"""Paste & execute a pre-formatted code block from clipboard.
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You must terminate the block with '--' (two minus-signs) or Ctrl-D
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alone on the line. You can also provide your own sentinel with '%paste
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-s %%' ('%%' is the new sentinel for this operation).
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The block is dedented prior to execution to enable execution of method
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definitions. '>' and '+' characters at the beginning of a line are
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ignored, to allow pasting directly from e-mails, diff files and
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doctests (the '...' continuation prompt is also stripped). The
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executed block is also assigned to variable named 'pasted_block' for
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later editing with '%edit pasted_block'.
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You can also pass a variable name as an argument, e.g. '%cpaste foo'.
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This assigns the pasted block to variable 'foo' as string, without
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dedenting or executing it (preceding >>> and + is still stripped)
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'%cpaste -r' re-executes the block previously entered by cpaste.
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'%cpaste -q' suppresses any additional output messages.
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Do not be alarmed by garbled output on Windows (it's a readline bug).
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Just press enter and type -- (and press enter again) and the block
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will be what was just pasted.
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IPython statements (magics, shell escapes) are not supported (yet).
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See also
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--------
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paste: automatically pull code from clipboard.
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Examples
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--------
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::
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In [8]: %cpaste
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Pasting code; enter '--' alone on the line to stop.
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:>>> a = ["world!", "Hello"]
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:>>> print " ".join(sorted(a))
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:--
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Hello world!
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"""
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opts, name = self.parse_options(parameter_s, 'rqs:', mode='string')
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if 'r' in opts:
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self.rerun_pasted()
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return
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quiet = ('q' in opts)
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sentinel = opts.get('s', u'--')
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block = '\n'.join(get_pasted_lines(sentinel, quiet=quiet))
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self.store_or_execute(block, name)
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@line_magic
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def paste(self, parameter_s=''):
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"""Paste & execute a pre-formatted code block from clipboard.
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The text is pulled directly from the clipboard without user
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intervention and printed back on the screen before execution (unless
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the -q flag is given to force quiet mode).
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The block is dedented prior to execution to enable execution of method
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definitions. '>' and '+' characters at the beginning of a line are
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ignored, to allow pasting directly from e-mails, diff files and
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doctests (the '...' continuation prompt is also stripped). The
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executed block is also assigned to variable named 'pasted_block' for
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later editing with '%edit pasted_block'.
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You can also pass a variable name as an argument, e.g. '%paste foo'.
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This assigns the pasted block to variable 'foo' as string, without
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executing it (preceding >>> and + is still stripped).
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Options:
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-r: re-executes the block previously entered by cpaste.
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-q: quiet mode: do not echo the pasted text back to the terminal.
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IPython statements (magics, shell escapes) are not supported (yet).
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See also
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--------
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cpaste: manually paste code into terminal until you mark its end.
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"""
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opts, name = self.parse_options(parameter_s, 'rq', mode='string')
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if 'r' in opts:
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self.rerun_pasted()
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return
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try:
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block = self.shell.hooks.clipboard_get()
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except TryNext as clipboard_exc:
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message = getattr(clipboard_exc, 'args')
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if message:
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error(message[0])
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else:
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error('Could not get text from the clipboard.')
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return
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except ClipboardEmpty:
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raise UsageError("The clipboard appears to be empty")
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# By default, echo back to terminal unless quiet mode is requested
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if 'q' not in opts:
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write = self.shell.write
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write(self.shell.pycolorize(block))
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if not block.endswith('\n'):
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write('\n')
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write("## -- End pasted text --\n")
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self.store_or_execute(block, name)
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# Class-level: add a '%cls' magic only on Windows
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if sys.platform == 'win32':
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@line_magic
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def cls(self, s):
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"""Clear screen.
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"""
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os.system("cls")
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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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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 the application.
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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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usage = Unicode(interactive_usage)
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# This `using_paste_magics` is used to detect whether the code is being
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# executed via paste magics functions
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using_paste_magics = CBool(False)
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# In the terminal, GUI control is done via PyOS_InputHook
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@staticmethod
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def enable_gui(gui=None, app=None):
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"""Switch amongst GUI input hooks by name.
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"""
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# Deferred import
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from IPython.lib.inputhook import enable_gui as real_enable_gui
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try:
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return real_enable_gui(gui, app)
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except ValueError as e:
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raise UsageError("%s" % e)
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system = InteractiveShell.system_raw
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#-------------------------------------------------------------------------
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# Overrides of init stages
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#-------------------------------------------------------------------------
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def init_display_formatter(self):
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super(TerminalInteractiveShell, self).init_display_formatter()
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# terminal only supports plaintext
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self.display_formatter.active_types = ['text/plain']
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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 _term_title_changed(self, name, new_value):
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self.init_term_title()
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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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else :
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aliases = []
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for name, cmd in aliases:
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self.alias_manager.soft_define_alias(name, cmd)
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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 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 = get_stream_enc(sys.stdin, '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, py3compat.string_types):
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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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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
|
|
|
# ask_exit callback.
|
|
|
|
|
|
while not self.exit_now:
|
|
|
self.hooks.pre_prompt_hook()
|
|
|
if more:
|
|
|
try:
|
|
|
prompt = self.prompt_manager.render('in2')
|
|
|
except:
|
|
|
self.showtraceback()
|
|
|
if self.autoindent:
|
|
|
self.rl_do_indent = True
|
|
|
|
|
|
else:
|
|
|
try:
|
|
|
prompt = self.separate_in + self.prompt_manager.render('in')
|
|
|
except:
|
|
|
self.showtraceback()
|
|
|
try:
|
|
|
line = self.raw_input(prompt)
|
|
|
if self.exit_now:
|
|
|
# quick exit on sys.std[in|out] close
|
|
|
break
|
|
|
if self.autoindent:
|
|
|
self.rl_do_indent = False
|
|
|
|
|
|
except KeyboardInterrupt:
|
|
|
#double-guard against keyboardinterrupts during kbdint handling
|
|
|
try:
|
|
|
self.write('\n' + self.get_exception_only())
|
|
|
source_raw = self.input_splitter.raw_reset()
|
|
|
hlen_b4_cell = \
|
|
|
self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
|
|
|
more = False
|
|
|
except KeyboardInterrupt:
|
|
|
pass
|
|
|
except EOFError:
|
|
|
if self.autoindent:
|
|
|
self.rl_do_indent = False
|
|
|
if self.has_readline:
|
|
|
self.readline_startup_hook(None)
|
|
|
self.write('\n')
|
|
|
self.exit()
|
|
|
except bdb.BdbQuit:
|
|
|
warn('The Python debugger has exited with a BdbQuit exception.\n'
|
|
|
'Because of how pdb handles the stack, it is impossible\n'
|
|
|
'for IPython to properly format this particular exception.\n'
|
|
|
'IPython will resume normal operation.')
|
|
|
except:
|
|
|
# exceptions here are VERY RARE, but they can be triggered
|
|
|
# asynchronously by signal handlers, for example.
|
|
|
self.showtraceback()
|
|
|
else:
|
|
|
try:
|
|
|
self.input_splitter.push(line)
|
|
|
more = self.input_splitter.push_accepts_more()
|
|
|
except SyntaxError:
|
|
|
# Run the code directly - run_cell takes care of displaying
|
|
|
# the exception.
|
|
|
more = False
|
|
|
if (self.SyntaxTB.last_syntax_error and
|
|
|
self.autoedit_syntax):
|
|
|
self.edit_syntax_error()
|
|
|
if not more:
|
|
|
source_raw = self.input_splitter.raw_reset()
|
|
|
self.run_cell(source_raw, store_history=True)
|
|
|
hlen_b4_cell = \
|
|
|
self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
|
|
|
|
|
|
# Turn off the exit flag, so the mainloop can be restarted if desired
|
|
|
self.exit_now = False
|
|
|
|
|
|
def raw_input(self, prompt=''):
|
|
|
"""Write a prompt and read a line.
|
|
|
|
|
|
The returned line does not include the trailing newline.
|
|
|
When the user enters the EOF key sequence, EOFError is raised.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
|
|
|
prompt : str, optional
|
|
|
A string to be printed to prompt the user.
|
|
|
"""
|
|
|
# raw_input expects str, but we pass it unicode sometimes
|
|
|
prompt = py3compat.cast_bytes_py2(prompt)
|
|
|
|
|
|
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!\n")
|
|
|
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 = open(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()
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Things related to magics
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def init_magics(self):
|
|
|
super(TerminalInteractiveShell, self).init_magics()
|
|
|
self.register_magics(TerminalMagics)
|
|
|
|
|
|
def showindentationerror(self):
|
|
|
super(TerminalInteractiveShell, self).showindentationerror()
|
|
|
if not self.using_paste_magics:
|
|
|
print("If you want to paste code into IPython, try the "
|
|
|
"%paste and %cpaste magic functions.")
|
|
|
|
|
|
|
|
|
InteractiveShellABC.register(TerminalInteractiveShell)
|
|
|
|
