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"""IPython terminal interface using prompt_toolkit in place of readline"""
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from __future__ import print_function
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import os
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import sys
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import signal
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import unicodedata
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from warnings import warn
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from wcwidth import wcwidth
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from IPython.core.error import TryNext
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from IPython.core.interactiveshell import InteractiveShell
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from IPython.utils.py3compat import PY3, cast_unicode_py2, input
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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 traitlets import Bool, CBool, Unicode, Dict, Integer
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from prompt_toolkit.completion import Completer, Completion
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from prompt_toolkit.enums import DEFAULT_BUFFER, SEARCH_BUFFER
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from prompt_toolkit.filters import HasFocus, HasSelection, Condition
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from prompt_toolkit.history import InMemoryHistory
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from prompt_toolkit.shortcuts import create_prompt_application, create_eventloop
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from prompt_toolkit.interface import CommandLineInterface
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from prompt_toolkit.key_binding.manager import KeyBindingManager
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from prompt_toolkit.key_binding.vi_state import InputMode
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from prompt_toolkit.key_binding.bindings.vi import ViStateFilter
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from prompt_toolkit.keys import Keys
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from prompt_toolkit.layout.lexers import Lexer
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from prompt_toolkit.layout.lexers import PygmentsLexer
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from prompt_toolkit.styles import PygmentsStyle
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from pygments.styles import get_style_by_name
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from pygments.lexers import Python3Lexer, BashLexer, PythonLexer
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from pygments.token import Token
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from .pt_inputhooks import get_inputhook_func
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from .interactiveshell import get_default_editor, TerminalMagics
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class IPythonPTCompleter(Completer):
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"""Adaptor to provide IPython completions to prompt_toolkit"""
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def __init__(self, ipy_completer):
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self.ipy_completer = ipy_completer
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def get_completions(self, document, complete_event):
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if not document.current_line.strip():
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return
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used, matches = self.ipy_completer.complete(
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line_buffer=document.current_line,
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cursor_pos=document.cursor_position_col
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)
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start_pos = -len(used)
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for m in matches:
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m = unicodedata.normalize('NFC', m)
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# When the first character of the completion has a zero length,
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# then it's probably a decomposed unicode character. E.g. caused by
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# the "\dot" completion. Try to compose again with the previous
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# character.
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if wcwidth(m[0]) == 0:
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if document.cursor_position + start_pos > 0:
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char_before = document.text[document.cursor_position + start_pos - 1]
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m = unicodedata.normalize('NFC', char_before + m)
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# Yield the modified completion instead, if this worked.
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if wcwidth(m[0:1]) == 1:
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yield Completion(m, start_position=start_pos - 1)
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continue
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yield Completion(m, start_position=start_pos)
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class IPythonPTLexer(Lexer):
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"""
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Wrapper around PythonLexer and BashLexer.
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"""
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def __init__(self):
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self.python_lexer = PygmentsLexer(Python3Lexer if PY3 else PythonLexer)
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self.shell_lexer = PygmentsLexer(BashLexer)
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def lex_document(self, cli, document):
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if document.text.startswith('!'):
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return self.shell_lexer.lex_document(cli, document)
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else:
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return self.python_lexer.lex_document(cli, document)
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class TerminalInteractiveShell(InteractiveShell):
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colors_force = True
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space_for_menu = Integer(6, config=True, help='space at the bottom of the screen to reserve for'
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'the completion menu')
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pt_cli = None
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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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vi_mode = Bool(False, config=True,
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help="Use vi style keybindings at the prompt",
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)
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mouse_support = Bool(False, config=True,
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help="Enable mouse support in the prompt"
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)
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highlighting_style = Unicode('', config=True,
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help="The name of a Pygments style to use for syntax highlighting"
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)
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highlighting_style_overrides = Dict(config=True,
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help="Override highlighting format for specific tokens"
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)
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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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term_title = Bool(True, config=True,
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help="Automatically set the terminal title"
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)
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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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def get_prompt_tokens(self, cli):
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return [
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(Token.Prompt, 'In ['),
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(Token.PromptNum, str(self.execution_count)),
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(Token.Prompt, ']: '),
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]
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def get_continuation_tokens(self, cli, width):
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return [
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(Token.Prompt, (' ' * (width - 5)) + '...: '),
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]
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def init_prompt_toolkit_cli(self):
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if ('IPY_TEST_SIMPLE_PROMPT' in os.environ) or not sys.stdin.isatty():
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# Fall back to plain non-interactive output for tests.
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# This is very limited, and only accepts a single line.
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def prompt():
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return cast_unicode_py2(input('In [%d]: ' % self.execution_count))
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self.prompt_for_code = prompt
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return
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kbmanager = KeyBindingManager.for_prompt(enable_vi_mode=self.vi_mode)
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insert_mode = ViStateFilter(kbmanager.get_vi_state, InputMode.INSERT)
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# Ctrl+J == Enter, seemingly
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@kbmanager.registry.add_binding(Keys.ControlJ,
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filter=(HasFocus(DEFAULT_BUFFER)
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& ~HasSelection()
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& insert_mode
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))
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def _(event):
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b = event.current_buffer
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d = b.document
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if not (d.on_last_line or d.cursor_position_row >= d.line_count
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- d.empty_line_count_at_the_end()):
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b.newline()
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return
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status, indent = self.input_splitter.check_complete(d.text)
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if (status != 'incomplete') and b.accept_action.is_returnable:
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b.accept_action.validate_and_handle(event.cli, b)
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else:
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b.insert_text('\n' + (' ' * (indent or 0)))
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@kbmanager.registry.add_binding(Keys.ControlC, filter=HasFocus(DEFAULT_BUFFER))
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def _(event):
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event.current_buffer.reset()
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@kbmanager.registry.add_binding(Keys.ControlC, filter=HasFocus(SEARCH_BUFFER))
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def _(event):
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if event.current_buffer.document.text:
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event.current_buffer.reset()
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else:
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event.cli.push_focus(DEFAULT_BUFFER)
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supports_suspend = Condition(lambda cli: hasattr(signal, 'SIGTSTP'))
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@kbmanager.registry.add_binding(Keys.ControlZ, filter=supports_suspend)
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def _(event):
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event.cli.suspend_to_background()
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@Condition
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def cursor_in_leading_ws(cli):
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before = cli.application.buffer.document.current_line_before_cursor
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return (not before) or before.isspace()
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# Ctrl+I == Tab
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@kbmanager.registry.add_binding(Keys.ControlI,
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filter=(HasFocus(DEFAULT_BUFFER)
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& ~HasSelection()
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& insert_mode
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& cursor_in_leading_ws
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))
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def _(event):
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event.current_buffer.insert_text(' ' * 4)
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# Pre-populate history from IPython's history database
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history = InMemoryHistory()
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last_cell = u""
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for _, _, cell in self.history_manager.get_tail(self.history_load_length,
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include_latest=True):
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# Ignore blank lines and consecutive duplicates
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cell = cell.rstrip()
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if cell and (cell != last_cell):
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history.append(cell)
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style_overrides = {
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Token.Prompt: '#009900',
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Token.PromptNum: '#00ff00 bold',
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}
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if self.highlighting_style:
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style_cls = get_style_by_name(self.highlighting_style)
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else:
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style_cls = get_style_by_name('default')
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# The default theme needs to be visible on both a dark background
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# and a light background, because we can't tell what the terminal
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# looks like. These tweaks to the default theme help with that.
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style_overrides.update({
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Token.Number: '#007700',
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Token.Operator: 'noinherit',
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Token.String: '#BB6622',
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Token.Name.Function: '#2080D0',
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Token.Name.Class: 'bold #2080D0',
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Token.Name.Namespace: 'bold #2080D0',
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})
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style_overrides.update(self.highlighting_style_overrides)
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style = PygmentsStyle.from_defaults(pygments_style_cls=style_cls,
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style_dict=style_overrides)
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app = create_prompt_application(multiline=True,
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lexer=IPythonPTLexer(),
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get_prompt_tokens=self.get_prompt_tokens,
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get_continuation_tokens=self.get_continuation_tokens,
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key_bindings_registry=kbmanager.registry,
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history=history,
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completer=IPythonPTCompleter(self.Completer),
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enable_history_search=True,
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style=style,
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mouse_support=self.mouse_support,
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reserve_space_for_menu=self.space_for_menu,
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)
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self.pt_cli = CommandLineInterface(app,
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eventloop=create_eventloop(self.inputhook))
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def prompt_for_code(self):
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document = self.pt_cli.run(pre_run=self.pre_prompt)
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return document.text
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def init_io(self):
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if sys.platform not in {'win32', 'cli'}:
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return
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import colorama
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colorama.init()
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# For some reason we make these wrappers around stdout/stderr.
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# For now, we need to reset them so all output gets coloured.
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# https://github.com/ipython/ipython/issues/8669
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from IPython.utils import io
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io.stdout = io.IOStream(sys.stdout)
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io.stderr = io.IOStream(sys.stderr)
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def init_magics(self):
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super(TerminalInteractiveShell, self).init_magics()
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self.register_magics(TerminalMagics)
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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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for cmd in ['clear', 'more', 'less', 'man']:
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self.alias_manager.soft_define_alias(cmd, cmd)
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def __init__(self, *args, **kwargs):
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super(TerminalInteractiveShell, self).__init__(*args, **kwargs)
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self.init_prompt_toolkit_cli()
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self.init_term_title()
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self.keep_running = True
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def ask_exit(self):
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self.keep_running = False
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rl_next_input = None
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def pre_prompt(self):
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if self.rl_next_input:
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self.pt_cli.application.buffer.text = cast_unicode_py2(self.rl_next_input)
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self.rl_next_input = None
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def interact(self):
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while self.keep_running:
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print(self.separate_in, end='')
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try:
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code = self.prompt_for_code()
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except EOFError:
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if (not self.confirm_exit) \
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or self.ask_yes_no('Do you really want to exit ([y]/n)?','y','n'):
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self.ask_exit()
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else:
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if code:
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self.run_cell(code, store_history=True)
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if self.autoedit_syntax and self.SyntaxTB.last_syntax_error:
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self.edit_syntax_error()
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def mainloop(self):
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# An extra layer of protection in case someone mashing Ctrl-C breaks
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# out of our internal code.
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while True:
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try:
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self.interact()
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break
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except KeyboardInterrupt:
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print("\nKeyboardInterrupt escaped interact()\n")
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_inputhook = None
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def inputhook(self, context):
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if self._inputhook is not None:
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self._inputhook(context)
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def enable_gui(self, gui=None):
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if gui:
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self._inputhook = get_inputhook_func(gui)
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else:
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self._inputhook = None
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# Methods to support auto-editing of SyntaxErrors:
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def edit_syntax_error(self):
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"""The bottom half of the syntax error handler called in the main loop.
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Loop until syntax error is fixed or user cancels.
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"""
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while self.SyntaxTB.last_syntax_error:
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# copy and clear last_syntax_error
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err = self.SyntaxTB.clear_err_state()
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if not self._should_recompile(err):
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return
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try:
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# may set last_syntax_error again if a SyntaxError is raised
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self.safe_execfile(err.filename, self.user_ns)
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except:
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self.showtraceback()
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else:
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try:
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with open(err.filename) as f:
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# This should be inside a display_trap block and I
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# think it is.
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sys.displayhook(f.read())
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except:
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self.showtraceback()
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def _should_recompile(self, e):
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"""Utility routine for edit_syntax_error"""
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if e.filename in ('<ipython console>', '<input>', '<string>',
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'<console>', '<BackgroundJob compilation>',
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None):
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return False
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try:
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if (self.autoedit_syntax and
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not self.ask_yes_no(
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'Return to editor to correct syntax error? '
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'[Y/n] ', 'y')):
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return False
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except EOFError:
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return False
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def int0(x):
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try:
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return int(x)
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except TypeError:
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return 0
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# always pass integer line and offset values to editor hook
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try:
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self.hooks.fix_error_editor(e.filename,
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int0(e.lineno), int0(e.offset),
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e.msg)
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except TryNext:
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warn('Could not open editor')
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return False
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return True
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# Run !system commands directly, not through pipes, so terminal programs
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# work correctly.
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system = InteractiveShell.system_raw
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if __name__ == '__main__':
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TerminalInteractiveShell.instance().interact()
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