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@gforsyth @scopatz @6syun9 @melund @laloch @dotsdl
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# -*- coding: utf-8 -*-
"""The prompt_toolkit based xonsh shell."""
import sys
import builtins
from types import MethodType
from xonsh.events import events
from xonsh.base_shell import BaseShell
from xonsh.shell import transform_command
from xonsh.tools import print_exception, carriage_return
from xonsh.platform import HAS_PYGMENTS, ON_WINDOWS
from xonsh.style_tools import partial_color_tokenize, _TokenType, DEFAULT_STYLE_DICT
from xonsh.lazyimps import pygments, pyghooks, winutils
from xonsh.pygments_cache import get_all_styles
from xonsh.ptk2.history import PromptToolkitHistory, _cust_history_matches
from xonsh.ptk2.completer import PromptToolkitCompleter
from xonsh.ptk2.key_bindings import load_xonsh_bindings
from prompt_toolkit.auto_suggest import AutoSuggestFromHistory
from prompt_toolkit.lexers import PygmentsLexer
from prompt_toolkit.enums import EditingMode
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.history import ThreadedHistory
from prompt_toolkit.shortcuts import print_formatted_text as ptk_print
from prompt_toolkit.shortcuts import CompleteStyle
from prompt_toolkit.shortcuts.prompt import PromptSession
from prompt_toolkit.formatted_text import PygmentsTokens
from prompt_toolkit.styles import merge_styles, Style
from prompt_toolkit.styles.pygments import (
style_from_pygments_cls,
style_from_pygments_dict,
)
Token = _TokenType()
events.transmogrify("on_ptk_create", "LoadEvent")
events.doc(
"on_ptk_create",
"""
on_ptk_create(prompter: PromptSession, history: PromptToolkitHistory, completer: PromptToolkitCompleter, bindings: KeyBindings) ->
Fired after prompt toolkit has been initialized
""",
)
class PromptToolkit2Shell(BaseShell):
"""The xonsh shell for prompt_toolkit v2."""
completion_displays_to_styles = {
"multi": CompleteStyle.MULTI_COLUMN,
"single": CompleteStyle.COLUMN,
"readline": CompleteStyle.READLINE_LIKE,
"none": None,
}
def __init__(self, **kwargs):
super().__init__(**kwargs)
if ON_WINDOWS:
winutils.enable_virtual_terminal_processing()
self._first_prompt = True
self.history = ThreadedHistory(PromptToolkitHistory())
self.prompter = PromptSession(history=self.history)
self.pt_completer = PromptToolkitCompleter(self.completer, self.ctx, self)
self.key_bindings = KeyBindings()
load_xonsh_bindings(self.key_bindings)
# Store original `_history_matches` in case we need to restore it
self._history_matches_orig = self.prompter.default_buffer._history_matches
# This assumes that PromptToolkit2Shell is a singleton
events.on_ptk_create.fire(
prompter=self.prompter,
history=self.history,
completer=self.pt_completer,
bindings=self.key_bindings,
)
def singleline(
self, auto_suggest=None, enable_history_search=True, multiline=True, **kwargs
):
"""Reads a single line of input from the shell. The store_in_history
kwarg flags whether the input should be stored in PTK's in-memory
history.
"""
events.on_pre_prompt.fire()
env = builtins.__xonsh__.env
mouse_support = env.get("MOUSE_SUPPORT")
auto_suggest = auto_suggest if env.get("AUTO_SUGGEST") else None
refresh_interval = env.get("PROMPT_REFRESH_INTERVAL")
refresh_interval = refresh_interval if refresh_interval > 0 else None
complete_in_thread = env.get("COMPLETION_IN_THREAD")
completions_display = env.get("COMPLETIONS_DISPLAY")
complete_style = self.completion_displays_to_styles[completions_display]
complete_while_typing = env.get("UPDATE_COMPLETIONS_ON_KEYPRESS")
if complete_while_typing:
# PTK requires history search to be none when completing while typing
enable_history_search = False
if HAS_PYGMENTS:
self.styler.style_name = env.get("XONSH_COLOR_STYLE")
completer = None if completions_display == "none" else self.pt_completer
if env.get("UPDATE_PROMPT_ON_KEYPRESS"):
get_prompt_tokens = self.prompt_tokens
get_rprompt_tokens = self.rprompt_tokens
get_bottom_toolbar_tokens = self.bottom_toolbar_tokens
else:
get_prompt_tokens = self.prompt_tokens()
get_rprompt_tokens = self.rprompt_tokens()
get_bottom_toolbar_tokens = self.bottom_toolbar_tokens()
if env.get("VI_MODE"):
editing_mode = EditingMode.VI
else:
editing_mode = EditingMode.EMACS
if env.get("XONSH_HISTORY_MATCH_ANYWHERE"):
self.prompter.default_buffer._history_matches = MethodType(
_cust_history_matches, self.prompter.default_buffer
)
elif (
self.prompter.default_buffer._history_matches
is not self._history_matches_orig
):
self.prompter.default_buffer._history_matches = self._history_matches_orig
prompt_args = {
"mouse_support": mouse_support,
"auto_suggest": auto_suggest,
"message": get_prompt_tokens,
"rprompt": get_rprompt_tokens,
"bottom_toolbar": get_bottom_toolbar_tokens,
"completer": completer,
"multiline": multiline,
"editing_mode": editing_mode,
"prompt_continuation": self.continuation_tokens,
"enable_history_search": enable_history_search,
"reserve_space_for_menu": 0,
"key_bindings": self.key_bindings,
"complete_style": complete_style,
"complete_while_typing": complete_while_typing,
"include_default_pygments_style": False,
"refresh_interval": refresh_interval,
"complete_in_thread": complete_in_thread,
}
if builtins.__xonsh__.env.get("COLOR_INPUT"):
if HAS_PYGMENTS:
prompt_args["lexer"] = PygmentsLexer(pyghooks.XonshLexer)
style = style_from_pygments_cls(pyghooks.xonsh_style_proxy(self.styler))
else:
style = style_from_pygments_dict(DEFAULT_STYLE_DICT)
prompt_args["style"] = style
style_overrides_env = env.get("PTK_STYLE_OVERRIDES")
if style_overrides_env:
try:
style_overrides = Style.from_dict(style_overrides_env)
prompt_args["style"] = merge_styles([style, style_overrides])
except (AttributeError, TypeError, ValueError):
print_exception()
line = self.prompter.prompt(**prompt_args)
events.on_post_prompt.fire()
return line
def _push(self, line):
"""Pushes a line onto the buffer and compiles the code in a way that
enables multiline input.
"""
code = None
self.buffer.append(line)
if self.need_more_lines:
return None, code
src = "".join(self.buffer)
src = transform_command(src)
try:
code = self.execer.compile(src, mode="single", glbs=self.ctx, locs=None)
self.reset_buffer()
except Exception: # pylint: disable=broad-except
self.reset_buffer()
print_exception()
return src, None
return src, code
def cmdloop(self, intro=None):
"""Enters a loop that reads and execute input from user."""
if intro:
print(intro)
auto_suggest = AutoSuggestFromHistory()
self.push = self._push
while not builtins.__xonsh__.exit:
try:
line = self.singleline(auto_suggest=auto_suggest)
if not line:
self.emptyline()
else:
line = self.precmd(line)
self.default(line)
except (KeyboardInterrupt, SystemExit):
self.reset_buffer()
except EOFError:
if builtins.__xonsh__.env.get("IGNOREEOF"):
print('Use "exit" to leave the shell.', file=sys.stderr)
else:
break
def prompt_tokens(self):
"""Returns a list of (token, str) tuples for the current prompt."""
p = builtins.__xonsh__.env.get("PROMPT")
try:
p = self.prompt_formatter(p)
except Exception: # pylint: disable=broad-except
print_exception()
toks = partial_color_tokenize(p)
if self._first_prompt:
carriage_return()
self._first_prompt = False
self.settitle()
return PygmentsTokens(toks)
def rprompt_tokens(self):
"""Returns a list of (token, str) tuples for the current right
prompt.
"""
p = builtins.__xonsh__.env.get("RIGHT_PROMPT")
# self.prompt_formatter does handle empty strings properly,
# but this avoids descending into it in the common case of
# $RIGHT_PROMPT == ''.
if isinstance(p, str) and len(p) == 0:
return []
try:
p = self.prompt_formatter(p)
except Exception: # pylint: disable=broad-except
print_exception()
toks = partial_color_tokenize(p)
return PygmentsTokens(toks)
def bottom_toolbar_tokens(self):
"""Returns a list of (token, str) tuples for the current bottom
toolbar.
"""
p = builtins.__xonsh__.env.get("BOTTOM_TOOLBAR")
if not p:
return
try:
p = self.prompt_formatter(p)
except Exception: # pylint: disable=broad-except
print_exception()
toks = partial_color_tokenize(p)
return PygmentsTokens(toks)
def continuation_tokens(self, width, line_number, is_soft_wrap=False):
"""Displays dots in multiline prompt"""
if is_soft_wrap:
return ""
width = width - 1
dots = builtins.__xonsh__.env.get("MULTILINE_PROMPT")
dots = dots() if callable(dots) else dots
if not dots:
return ""
basetoks = self.format_color(dots)
baselen = sum(len(t[1]) for t in basetoks)
if baselen == 0:
return [(Token, " " * (width + 1))]
toks = basetoks * (width // baselen)
n = width % baselen
count = 0
for tok in basetoks:
slen = len(tok[1])
newcount = slen + count
if slen == 0:
continue
elif newcount <= n:
toks.append(tok)
else:
toks.append((tok[0], tok[1][: n - count]))
count = newcount
if n <= count:
break
toks.append((Token, " ")) # final space
return PygmentsTokens(toks)
def format_color(self, string, hide=False, force_string=False, **kwargs):
"""Formats a color string using Pygments. This, therefore, returns
a list of (Token, str) tuples. If force_string is set to true, though,
this will return a color formatted string.
"""
tokens = partial_color_tokenize(string)
if force_string and HAS_PYGMENTS:
env = builtins.__xonsh__.env
self.styler.style_name = env.get("XONSH_COLOR_STYLE")
proxy_style = pyghooks.xonsh_style_proxy(self.styler)
formatter = pyghooks.XonshTerminal256Formatter(style=proxy_style)
s = pygments.format(tokens, formatter)
return s
elif force_string:
print("To force colorization of string, install Pygments")
return tokens
else:
return tokens
def print_color(self, string, end="\n", **kwargs):
"""Prints a color string using prompt-toolkit color management."""
if isinstance(string, str):
tokens = partial_color_tokenize(string)
else:
# assume this is a list of (Token, str) tuples and just print
tokens = string
tokens = PygmentsTokens(tokens)
if HAS_PYGMENTS:
env = builtins.__xonsh__.env
self.styler.style_name = env.get("XONSH_COLOR_STYLE")
proxy_style = style_from_pygments_cls(
pyghooks.xonsh_style_proxy(self.styler)
)
else:
proxy_style = style_from_pygments_dict(DEFAULT_STYLE_DICT)
ptk_print(
tokens, style=proxy_style, end=end, include_default_pygments_style=False
)
def color_style_names(self):
"""Returns an iterable of all available style names."""
if not HAS_PYGMENTS:
return ["For other xonsh styles, please install pygments"]
return get_all_styles()
def color_style(self):
"""Returns the current color map."""
if not HAS_PYGMENTS:
return DEFAULT_STYLE_DICT
env = builtins.__xonsh__.env
self.styler.style_name = env.get("XONSH_COLOR_STYLE")
return self.styler.styles
def restore_tty_sanity(self):
"""An interface for resetting the TTY stdin mode. This is highly
dependent on the shell backend. Also it is mostly optional since
it only affects ^Z backgrounding behaviour.
"""
# PTK does not seem to need any specialization here. However,
# if it does for some reason in the future...
# The following writes an ANSI escape sequence that sends the cursor
# to the end of the line. This has the effect of restoring ECHO mode.
# See http://unix.stackexchange.com/a/108014/129048 for more details.
# This line can also be replaced by os.system("stty sane"), as per
# http://stackoverflow.com/questions/19777129/interactive-python-interpreter-run-in-background#comment29421919_19778355
# However, it is important to note that not termios-based solution
# seems to work. My guess is that this is because termios restoration
# needs to be performed by the subprocess itself. This fix is important
# when subprocesses don't properly restore the terminal attributes,
# like Python in interactive mode. Also note that the sequences "\033M"
# and "\033E" seem to work too, but these are technically VT100 codes.
# I used the more primitive ANSI sequence to maximize compatibility.
# -scopatz 2017-01-28
# if not ON_POSIX:
# return
# sys.stdout.write('\033[9999999C\n')
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