"""IPython terminal interface using prompt_toolkit""" import asyncio import os import sys import warnings from warnings import warn from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC from IPython.utils import io from IPython.utils.py3compat import input from IPython.utils.terminal import toggle_set_term_title, set_term_title, restore_term_title from IPython.utils.process import abbrev_cwd from traitlets import ( Bool, Unicode, Dict, Integer, observe, Instance, Type, default, Enum, Union, Any, validate, Float, ) from prompt_toolkit.auto_suggest import AutoSuggestFromHistory from prompt_toolkit.enums import DEFAULT_BUFFER, EditingMode from prompt_toolkit.filters import (HasFocus, Condition, IsDone) from prompt_toolkit.formatted_text import PygmentsTokens from prompt_toolkit.history import InMemoryHistory from prompt_toolkit.layout.processors import ConditionalProcessor, HighlightMatchingBracketProcessor from prompt_toolkit.output import ColorDepth from prompt_toolkit.patch_stdout import patch_stdout from prompt_toolkit.shortcuts import PromptSession, CompleteStyle, print_formatted_text from prompt_toolkit.styles import DynamicStyle, merge_styles from prompt_toolkit.styles.pygments import style_from_pygments_cls, style_from_pygments_dict from prompt_toolkit import __version__ as ptk_version from pygments.styles import get_style_by_name from pygments.style import Style from pygments.token import Token from .debugger import TerminalPdb, Pdb from .magics import TerminalMagics from .pt_inputhooks import get_inputhook_name_and_func from .prompts import Prompts, ClassicPrompts, RichPromptDisplayHook from .ptutils import IPythonPTCompleter, IPythonPTLexer from .shortcuts import create_ipython_shortcuts PTK3 = ptk_version.startswith('3.') class _NoStyle(Style): pass _style_overrides_light_bg = { Token.Prompt: '#ansibrightblue', Token.PromptNum: '#ansiblue bold', Token.OutPrompt: '#ansibrightred', Token.OutPromptNum: '#ansired bold', } _style_overrides_linux = { Token.Prompt: '#ansibrightgreen', Token.PromptNum: '#ansigreen bold', Token.OutPrompt: '#ansibrightred', Token.OutPromptNum: '#ansired bold', } def get_default_editor(): try: return os.environ['EDITOR'] except KeyError: pass except UnicodeError: warn("$EDITOR environment variable is not pure ASCII. Using platform " "default editor.") if os.name == 'posix': return 'vi' # the only one guaranteed to be there! else: return 'notepad' # same in Windows! # conservatively check for tty # overridden streams can result in things like: # - sys.stdin = None # - no isatty method for _name in ('stdin', 'stdout', 'stderr'): _stream = getattr(sys, _name) if not _stream or not hasattr(_stream, 'isatty') or not _stream.isatty(): _is_tty = False break else: _is_tty = True _use_simple_prompt = ('IPY_TEST_SIMPLE_PROMPT' in os.environ) or (not _is_tty) def black_reformat_handler(text_before_cursor): import black formatted_text = black.format_str(text_before_cursor, mode=black.FileMode()) if not text_before_cursor.endswith('\n') and formatted_text.endswith('\n'): formatted_text = formatted_text[:-1] return formatted_text class TerminalInteractiveShell(InteractiveShell): mime_renderers = Dict().tag(config=True) space_for_menu = Integer(6, help='Number of line at the bottom of the screen ' 'to reserve for the tab completion menu, ' 'search history, ...etc, the height of ' 'these menus will at most this value. ' 'Increase it is you prefer long and skinny ' 'menus, decrease for short and wide.' ).tag(config=True) pt_app = None debugger_history = None debugger_history_file = Unicode( "~/.pdbhistory", help="File in which to store and read history" ).tag(config=True) simple_prompt = Bool(_use_simple_prompt, help="""Use `raw_input` for the REPL, without completion and prompt colors. Useful when controlling IPython as a subprocess, and piping STDIN/OUT/ERR. Known usage are: IPython own testing machinery, and emacs inferior-shell integration through elpy. This mode default to `True` if the `IPY_TEST_SIMPLE_PROMPT` environment variable is set, or the current terminal is not a tty.""" ).tag(config=True) @property def debugger_cls(self): return Pdb if self.simple_prompt else TerminalPdb confirm_exit = Bool(True, help=""" Set to confirm when you try to exit IPython with an EOF (Control-D in Unix, Control-Z/Enter in Windows). By typing 'exit' or 'quit', you can force a direct exit without any confirmation.""", ).tag(config=True) editing_mode = Unicode('emacs', help="Shortcut style to use at the prompt. 'vi' or 'emacs'.", ).tag(config=True) emacs_bindings_in_vi_insert_mode = Bool( True, help="Add shortcuts from 'emacs' insert mode to 'vi' insert mode.", ).tag(config=True) modal_cursor = Bool( True, help=""" Cursor shape changes depending on vi mode: beam in vi insert mode, block in nav mode, underscore in replace mode.""", ).tag(config=True) ttimeoutlen = Float( 0.01, help="""The time in milliseconds that is waited for a key code to complete.""", ).tag(config=True) timeoutlen = Float( 0.5, help="""The time in milliseconds that is waited for a mapped key sequence to complete.""", ).tag(config=True) autoformatter = Unicode(None, help="Autoformatter to reformat Terminal code. Can be `'black'` or `None`", allow_none=True ).tag(config=True) mouse_support = Bool(False, help="Enable mouse support in the prompt\n(Note: prevents selecting text with the mouse)" ).tag(config=True) # We don't load the list of styles for the help string, because loading # Pygments plugins takes time and can cause unexpected errors. highlighting_style = Union([Unicode('legacy'), Type(klass=Style)], help="""The name or class of a Pygments style to use for syntax highlighting. To see available styles, run `pygmentize -L styles`.""" ).tag(config=True) @validate('editing_mode') def _validate_editing_mode(self, proposal): if proposal['value'].lower() == 'vim': proposal['value']= 'vi' elif proposal['value'].lower() == 'default': proposal['value']= 'emacs' if hasattr(EditingMode, proposal['value'].upper()): return proposal['value'].lower() return self.editing_mode @observe('editing_mode') def _editing_mode(self, change): if self.pt_app: self.pt_app.editing_mode = getattr(EditingMode, change.new.upper()) @observe('autoformatter') def _autoformatter_changed(self, change): formatter = change.new if formatter is None: self.reformat_handler = lambda x:x elif formatter == 'black': self.reformat_handler = black_reformat_handler else: raise ValueError @observe('highlighting_style') @observe('colors') def _highlighting_style_changed(self, change): self.refresh_style() def refresh_style(self): self._style = self._make_style_from_name_or_cls(self.highlighting_style) highlighting_style_overrides = Dict( help="Override highlighting format for specific tokens" ).tag(config=True) true_color = Bool(False, help="""Use 24bit colors instead of 256 colors in prompt highlighting. If your terminal supports true color, the following command should print ``TRUECOLOR`` in orange:: printf \"\\x1b[38;2;255;100;0mTRUECOLOR\\x1b[0m\\n\" """, ).tag(config=True) editor = Unicode(get_default_editor(), help="Set the editor used by IPython (default to $EDITOR/vi/notepad)." ).tag(config=True) prompts_class = Type(Prompts, help='Class used to generate Prompt token for prompt_toolkit').tag(config=True) prompts = Instance(Prompts) @default('prompts') def _prompts_default(self): return self.prompts_class(self) # @observe('prompts') # def _(self, change): # self._update_layout() @default('displayhook_class') def _displayhook_class_default(self): return RichPromptDisplayHook term_title = Bool(True, help="Automatically set the terminal title" ).tag(config=True) term_title_format = Unicode("IPython: {cwd}", help="Customize the terminal title format. This is a python format string. " + "Available substitutions are: {cwd}." ).tag(config=True) display_completions = Enum(('column', 'multicolumn','readlinelike'), help= ( "Options for displaying tab completions, 'column', 'multicolumn', and " "'readlinelike'. These options are for `prompt_toolkit`, see " "`prompt_toolkit` documentation for more information." ), default_value='multicolumn').tag(config=True) highlight_matching_brackets = Bool(True, help="Highlight matching brackets.", ).tag(config=True) extra_open_editor_shortcuts = Bool(False, help="Enable vi (v) or Emacs (C-X C-E) shortcuts to open an external editor. " "This is in addition to the F2 binding, which is always enabled." ).tag(config=True) handle_return = Any(None, help="Provide an alternative handler to be called when the user presses " "Return. This is an advanced option intended for debugging, which " "may be changed or removed in later releases." ).tag(config=True) enable_history_search = Bool(True, help="Allows to enable/disable the prompt toolkit history search" ).tag(config=True) prompt_includes_vi_mode = Bool(True, help="Display the current vi mode (when using vi editing mode)." ).tag(config=True) @observe('term_title') def init_term_title(self, change=None): # Enable or disable the terminal title. if self.term_title: toggle_set_term_title(True) set_term_title(self.term_title_format.format(cwd=abbrev_cwd())) else: toggle_set_term_title(False) def restore_term_title(self): if self.term_title: restore_term_title() def init_display_formatter(self): super(TerminalInteractiveShell, self).init_display_formatter() # terminal only supports plain text self.display_formatter.active_types = ['text/plain'] # disable `_ipython_display_` self.display_formatter.ipython_display_formatter.enabled = False def init_prompt_toolkit_cli(self): if self.simple_prompt: # Fall back to plain non-interactive output for tests. # This is very limited. def prompt(): prompt_text = "".join(x[1] for x in self.prompts.in_prompt_tokens()) lines = [input(prompt_text)] prompt_continuation = "".join(x[1] for x in self.prompts.continuation_prompt_tokens()) while self.check_complete('\n'.join(lines))[0] == 'incomplete': lines.append( input(prompt_continuation) ) return '\n'.join(lines) self.prompt_for_code = prompt return # Set up keyboard shortcuts key_bindings = create_ipython_shortcuts(self) # Pre-populate history from IPython's history database history = InMemoryHistory() last_cell = u"" for __, ___, cell in self.history_manager.get_tail(self.history_load_length, include_latest=True): # Ignore blank lines and consecutive duplicates cell = cell.rstrip() if cell and (cell != last_cell): history.append_string(cell) last_cell = cell self._style = self._make_style_from_name_or_cls(self.highlighting_style) self.style = DynamicStyle(lambda: self._style) editing_mode = getattr(EditingMode, self.editing_mode.upper()) self.pt_loop = asyncio.new_event_loop() self.pt_app = PromptSession( auto_suggest=AutoSuggestFromHistory(), editing_mode=editing_mode, key_bindings=key_bindings, history=history, completer=IPythonPTCompleter(shell=self), enable_history_search=self.enable_history_search, style=self.style, include_default_pygments_style=False, mouse_support=self.mouse_support, enable_open_in_editor=self.extra_open_editor_shortcuts, color_depth=self.color_depth, tempfile_suffix=".py", **self._extra_prompt_options() ) def _make_style_from_name_or_cls(self, name_or_cls): """ Small wrapper that make an IPython compatible style from a style name We need that to add style for prompt ... etc. """ style_overrides = {} if name_or_cls == 'legacy': legacy = self.colors.lower() if legacy == 'linux': style_cls = get_style_by_name('monokai') style_overrides = _style_overrides_linux elif legacy == 'lightbg': style_overrides = _style_overrides_light_bg style_cls = get_style_by_name('pastie') elif legacy == 'neutral': # The default theme needs to be visible on both a dark background # and a light background, because we can't tell what the terminal # looks like. These tweaks to the default theme help with that. style_cls = get_style_by_name('default') style_overrides.update({ Token.Number: '#ansigreen', Token.Operator: 'noinherit', Token.String: '#ansiyellow', Token.Name.Function: '#ansiblue', Token.Name.Class: 'bold #ansiblue', Token.Name.Namespace: 'bold #ansiblue', Token.Name.Variable.Magic: '#ansiblue', Token.Prompt: '#ansigreen', Token.PromptNum: '#ansibrightgreen bold', Token.OutPrompt: '#ansired', Token.OutPromptNum: '#ansibrightred bold', }) # Hack: Due to limited color support on the Windows console # the prompt colors will be wrong without this if os.name == 'nt': style_overrides.update({ Token.Prompt: '#ansidarkgreen', Token.PromptNum: '#ansigreen bold', Token.OutPrompt: '#ansidarkred', Token.OutPromptNum: '#ansired bold', }) elif legacy =='nocolor': style_cls=_NoStyle style_overrides = {} else : raise ValueError('Got unknown colors: ', legacy) else : if isinstance(name_or_cls, str): style_cls = get_style_by_name(name_or_cls) else: style_cls = name_or_cls style_overrides = { Token.Prompt: '#ansigreen', Token.PromptNum: '#ansibrightgreen bold', Token.OutPrompt: '#ansired', Token.OutPromptNum: '#ansibrightred bold', } style_overrides.update(self.highlighting_style_overrides) style = merge_styles([ style_from_pygments_cls(style_cls), style_from_pygments_dict(style_overrides), ]) return style @property def pt_complete_style(self): return { 'multicolumn': CompleteStyle.MULTI_COLUMN, 'column': CompleteStyle.COLUMN, 'readlinelike': CompleteStyle.READLINE_LIKE, }[self.display_completions] @property def color_depth(self): return (ColorDepth.TRUE_COLOR if self.true_color else None) def _extra_prompt_options(self): """ Return the current layout option for the current Terminal InteractiveShell """ def get_message(): return PygmentsTokens(self.prompts.in_prompt_tokens()) if self.editing_mode == 'emacs': # with emacs mode the prompt is (usually) static, so we call only # the function once. With VI mode it can toggle between [ins] and # [nor] so we can't precompute. # here I'm going to favor the default keybinding which almost # everybody uses to decrease CPU usage. # if we have issues with users with custom Prompts we can see how to # work around this. get_message = get_message() options = { 'complete_in_thread': False, 'lexer':IPythonPTLexer(), 'reserve_space_for_menu':self.space_for_menu, 'message': get_message, 'prompt_continuation': ( lambda width, lineno, is_soft_wrap: PygmentsTokens(self.prompts.continuation_prompt_tokens(width))), 'multiline': True, 'complete_style': self.pt_complete_style, # Highlight matching brackets, but only when this setting is # enabled, and only when the DEFAULT_BUFFER has the focus. 'input_processors': [ConditionalProcessor( processor=HighlightMatchingBracketProcessor(chars='[](){}'), filter=HasFocus(DEFAULT_BUFFER) & ~IsDone() & Condition(lambda: self.highlight_matching_brackets))], } if not PTK3: options['inputhook'] = self.inputhook return options def prompt_for_code(self): if self.rl_next_input: default = self.rl_next_input self.rl_next_input = None else: default = '' # In order to make sure that asyncio code written in the # interactive shell doesn't interfere with the prompt, we run the # prompt in a different event loop. # If we don't do this, people could spawn coroutine with a # while/true inside which will freeze the prompt. policy = asyncio.get_event_loop_policy() try: old_loop = policy.get_event_loop() except RuntimeError: # This happens when the the event loop is closed, # e.g. by calling `asyncio.run()`. old_loop = None policy.set_event_loop(self.pt_loop) try: with patch_stdout(raw=True): text = self.pt_app.prompt( default=default, **self._extra_prompt_options()) finally: # Restore the original event loop. if old_loop is not None: policy.set_event_loop(old_loop) return text def enable_win_unicode_console(self): # Since IPython 7.10 doesn't support python < 3.6 and PEP 528, Python uses the unicode APIs for the Windows # console by default, so WUC shouldn't be needed. from warnings import warn warn("`enable_win_unicode_console` is deprecated since IPython 7.10, does not do anything and will be removed in the future", DeprecationWarning, stacklevel=2) def init_io(self): if sys.platform not in {'win32', 'cli'}: return import colorama colorama.init() def init_magics(self): super(TerminalInteractiveShell, self).init_magics() self.register_magics(TerminalMagics) def init_alias(self): # The parent class defines aliases that can be safely used with any # frontend. super(TerminalInteractiveShell, self).init_alias() # Now define aliases that only make sense on the terminal, because they # need direct access to the console in a way that we can't emulate in # GUI or web frontend if os.name == 'posix': for cmd in ('clear', 'more', 'less', 'man'): self.alias_manager.soft_define_alias(cmd, cmd) def __init__(self, *args, **kwargs): super(TerminalInteractiveShell, self).__init__(*args, **kwargs) self.init_prompt_toolkit_cli() self.init_term_title() self.keep_running = True def ask_exit(self): self.keep_running = False rl_next_input = None def interact(self): self.keep_running = True while self.keep_running: print(self.separate_in, end='') try: code = self.prompt_for_code() except EOFError: if (not self.confirm_exit) \ or self.ask_yes_no('Do you really want to exit ([y]/n)?','y','n'): self.ask_exit() else: if code: self.run_cell(code, store_history=True) def mainloop(self): # An extra layer of protection in case someone mashing Ctrl-C breaks # out of our internal code. while True: try: self.interact() break except KeyboardInterrupt as e: print("\n%s escaped interact()\n" % type(e).__name__) finally: # An interrupt during the eventloop will mess up the # internal state of the prompt_toolkit library. # Stopping the eventloop fixes this, see # https://github.com/ipython/ipython/pull/9867 if hasattr(self, '_eventloop'): self._eventloop.stop() self.restore_term_title() # try to call some at-exit operation optimistically as some things can't # be done during interpreter shutdown. this is technically inaccurate as # this make mainlool not re-callable, but that should be a rare if not # in existent use case. self._atexit_once() _inputhook = None def inputhook(self, context): if self._inputhook is not None: self._inputhook(context) active_eventloop = None def enable_gui(self, gui=None): if gui and (gui != 'inline') : self.active_eventloop, self._inputhook =\ get_inputhook_name_and_func(gui) else: self.active_eventloop = self._inputhook = None # For prompt_toolkit 3.0. We have to create an asyncio event loop with # this inputhook. if PTK3: import asyncio from prompt_toolkit.eventloop import new_eventloop_with_inputhook if gui == 'asyncio': # When we integrate the asyncio event loop, run the UI in the # same event loop as the rest of the code. don't use an actual # input hook. (Asyncio is not made for nesting event loops.) self.pt_loop = asyncio.get_event_loop_policy().get_event_loop() elif self._inputhook: # If an inputhook was set, create a new asyncio event loop with # this inputhook for the prompt. self.pt_loop = new_eventloop_with_inputhook(self._inputhook) else: # When there's no inputhook, run the prompt in a separate # asyncio event loop. self.pt_loop = asyncio.new_event_loop() # Run !system commands directly, not through pipes, so terminal programs # work correctly. system = InteractiveShell.system_raw def auto_rewrite_input(self, cmd): """Overridden from the parent class to use fancy rewriting prompt""" if not self.show_rewritten_input: return tokens = self.prompts.rewrite_prompt_tokens() if self.pt_app: print_formatted_text(PygmentsTokens(tokens), end='', style=self.pt_app.app.style) print(cmd) else: prompt = ''.join(s for t, s in tokens) print(prompt, cmd, sep='') _prompts_before = None def switch_doctest_mode(self, mode): """Switch prompts to classic for %doctest_mode""" if mode: self._prompts_before = self.prompts self.prompts = ClassicPrompts(self) elif self._prompts_before: self.prompts = self._prompts_before self._prompts_before = None # self._update_layout() InteractiveShellABC.register(TerminalInteractiveShell) if __name__ == '__main__': TerminalInteractiveShell.instance().interact()