bpython/bpython/cli.py at de90c373930f35fdc32b8f89459001d4fe9605be · bpython/bpython · GitHub

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# The MIT License

# Copyright (c) bpython authors

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

# THE SOFTWARE.

# Modified by Brandon Navra

# Notes for Windows

# Prerequisites

# - Curses

# - pyreadline

# Added

# - Support for running on windows command prompt

# - input from numpad keys

# Issues

# - Suspend doesn't work nor does detection of resizing of screen

# - Instead the suspend key exits the program

# - View source doesn't work on windows unless you install the less program (From GnuUtils or Cygwin)

import platform

import os

import sys

import curses

import math

import re

import time

import functools

import struct

if platform.system() != "Windows":

import signal # Windows does not have job control

import termios # Windows uses curses

import fcntl # Windows uses curses

import unicodedata

import errno

# These are used for syntax highlighting

from pygments import format

from pygments.formatters import TerminalFormatter

from pygments.lexers import Python3Lexer

from pygments.token import Token

from .formatter import BPythonFormatter

# This for config

from .config import Struct, getpreferredencoding

# This for keys

from .keys import cli_key_dispatch as key_dispatch

# This for i18n

from . import translations

from .translations import _

from . import repl

from . import args as bpargs

from .pager import page

from .args import parse as argsparse

# --- module globals ---

stdscr = None

colors = None

DO_RESIZE = False

# ---

def calculate_screen_lines(tokens, width, cursor=0):

"""Given a stream of tokens and a screen width plus an optional

initial cursor position, return the amount of needed lines on the

screen."""

lines = 1

pos = cursor

for (token, value) in tokens:

if token is Token.Text and value == "\n":

lines += 1

else:

pos += len(value)

lines += pos // width

pos %= width

return lines

def forward_if_not_current(func):

@functools.wraps(func)

def newfunc(self, *args, **kwargs):

dest = self.get_dest()

if self is dest:

return func(self, *args, **kwargs)

else:

return getattr(self.get_dest(), newfunc.__name__)(*args, **kwargs)

return newfunc

class FakeStream:

"""Provide a fake file object which calls functions on the interface

provided."""

def __init__(self, interface, get_dest):

self.encoding = getpreferredencoding()

self.interface = interface

self.get_dest = get_dest

@forward_if_not_current

def write(self, s):

self.interface.write(s)

@forward_if_not_current

def writelines(self, l):

for s in l:

self.write(s)

def isatty(self):

# some third party (amongst them mercurial) depend on this

return True

def flush(self):

self.interface.flush()

class FakeStdin:

"""Provide a fake stdin type for things like raw_input() etc."""

def __init__(self, interface):

"""Take the curses Repl on init and assume it provides a get_key method

which, fortunately, it does."""

self.encoding = getpreferredencoding()

self.interface = interface

self.buffer = list()

def __iter__(self):

return iter(self.readlines())

def flush(self):

"""Flush the internal buffer. This is a no-op. Flushing stdin

doesn't make any sense anyway."""

def write(self, value):

# XXX IPython expects sys.stdin.write to exist, there will no doubt be

# others, so here's a hack to keep them happy

raise OSError(errno.EBADF, "sys.stdin is read-only")

def isatty(self):

return True

def readline(self, size=-1):

"""I can't think of any reason why anything other than readline would

be useful in the context of an interactive interpreter so this is the

only one I've done anything with. The others are just there in case

someone does something weird to stop it from blowing up."""

if not size:

return ""

elif self.buffer:

buffer = self.buffer.pop(0)

else:

buffer = ""

curses.raw(True)

try:

while not buffer.endswith(("\n", "\r")):

key = self.interface.get_key()

if key in (curses.erasechar(), "KEY_BACKSPACE"):

y, x = self.interface.scr.getyx()

if buffer:

self.interface.scr.delch(y, x - 1)

buffer = buffer[:-1]

continue

elif key == chr(4) and not buffer:

# C-d

return ""

elif key not in ("\n", "\r") and (

len(key) > 1 or unicodedata.category(key) == "Cc"

continue

sys.stdout.write(key)

# Include the \n in the buffer - raw_input() seems to deal with trailing

# linebreaks and will break if it gets an empty string.

buffer += key

finally:

curses.raw(False)

if size > 0:

rest = buffer[size:]

if rest:

self.buffer.append(rest)

buffer = buffer[:size]

return buffer

def read(self, size=None):

if size == 0:

return ""

data = list()

while size is None or size > 0:

line = self.readline(size or -1)

if not line:

break

if size is not None:

size -= len(line)

data.append(line)

return "".join(data)

def readlines(self, size=-1):

return list(iter(self.readline, ""))

# TODO:

# Tab completion does not work if not at the end of the line.

# Numerous optimisations can be made but it seems to do all the lookup stuff

# fast enough on even my crappy server so I'm not too bothered about that

# at the moment.

# The popup window that displays the argspecs and completion suggestions

# needs to be an instance of a ListWin class or something so I can wrap

# the addstr stuff to a higher level.

def get_color(config, name):

global colors

return colors[config.color_scheme[name].lower()]

def get_colpair(config, name):

return curses.color_pair(get_color(config, name) + 1)

def make_colors(config):

"""Init all the colours in curses and bang them into a dictionary"""

# blacK, Red, Green, Yellow, Blue, Magenta, Cyan, White, Default:

c = {

"k": 0,

"r": 1,

"g": 2,

"y": 3,

"b": 4,

"m": 5,

"c": 6,

"w": 7,

"d": -1,

}

if platform.system() == "Windows":

c = dict(

list(c.items())

+ [

("K", 8),

("R", 9),

("G", 10),

("Y", 11),

("B", 12),

("M", 13),

("C", 14),

("W", 15),

]

)

for i in range(63):

if i > 7:

j = i // 8

else:

j = c[config.color_scheme["background"]]

curses.init_pair(i + 1, i % 8, j)

return c

class CLIInteraction(repl.Interaction):

def __init__(self, config, statusbar=None):

super().__init__(config, statusbar)

def confirm(self, q):

"""Ask for yes or no and return boolean"""

try:

reply = self.statusbar.prompt(q)

except ValueError:

return False

return reply.lower() in (_("y"), _("yes"))

def notify(self, s, n=10, wait_for_keypress=False):

return self.statusbar.message(s, n)

def file_prompt(self, s):

return self.statusbar.prompt(s)

class CLIRepl(repl.Repl):

def __init__(self, scr, interp, statusbar, config, idle=None):

super().__init__(interp, config)

self.interp.writetb = self.writetb

self.scr = scr

self.stdout_hist = "" # native str (bytes in Py2, unicode in Py3)

self.list_win = newwin(get_colpair(config, "background"), 1, 1, 1, 1)

self.cpos = 0

self.do_exit = False

self.exit_value = ()

self.f_string = ""

self.idle = idle

self.in_hist = False

self.paste_mode = False

self.last_key_press = time.time()

self.s = ""

self.statusbar = statusbar

self.formatter = BPythonFormatter(config.color_scheme)

self.interact = CLIInteraction(self.config, statusbar=self.statusbar)

if config.cli_suggestion_width <= 0 or config.cli_suggestion_width > 1:

config.cli_suggestion_width = 0.8

def _get_cursor_offset(self):

return len(self.s) - self.cpos

def _set_cursor_offset(self, offset):

self.cpos = len(self.s) - offset

cursor_offset = property(

_get_cursor_offset,

_set_cursor_offset,

None,

"The cursor offset from the beginning of the line",

)

def addstr(self, s):

"""Add a string to the current input line and figure out

where it should go, depending on the cursor position."""

self.rl_history.reset()

if not self.cpos:

self.s += s

else:

l = len(self.s)

self.s = self.s[: l - self.cpos] + s + self.s[l - self.cpos :]

self.complete()

def atbol(self):

"""Return True or False accordingly if the cursor is at the beginning

of the line (whitespace is ignored). This exists so that p_key() knows

how to handle the tab key being pressed - if there is nothing but white

space before the cursor then process it as a normal tab otherwise

attempt tab completion."""

return not self.s.lstrip()

def bs(self, delete_tabs=True):

"""Process a backspace"""

self.rl_history.reset()

y, x = self.scr.getyx()

if not self.s:

return

if x == self.ix and y == self.iy:

return

n = 1

self.clear_wrapped_lines()

if not self.cpos:

# I know the nested if blocks look nasty. :(

if self.atbol() and delete_tabs:

n = len(self.s) % self.config.tab_length

if not n:

n = self.config.tab_length

self.s = self.s[:-n]

else:

self.s = self.s[: -self.cpos - 1] + self.s[-self.cpos :]

self.print_line(self.s, clr=True)

return n

def bs_word(self):

self.rl_history.reset()

pos = len(self.s) - self.cpos - 1

deleted = []

# First we delete any space to the left of the cursor.

while pos >= 0 and self.s[pos] == " ":

deleted.append(self.s[pos])

pos -= self.bs()

# Then we delete a full word.

while pos >= 0 and self.s[pos] != " ":

deleted.append(self.s[pos])

pos -= self.bs()

return "".join(reversed(deleted))

def check(self):

"""Check if paste mode should still be active and, if not, deactivate

it and force syntax highlighting."""

if (

self.paste_mode

and time.time() - self.last_key_press > self.config.paste_time

self.paste_mode = False

self.print_line(self.s)

def clear_current_line(self):

"""Called when a SyntaxError occurred in the interpreter. It is

used to prevent autoindentation from occurring after a

traceback."""

repl.Repl.clear_current_line(self)

self.s = ""

def clear_wrapped_lines(self):

"""Clear the wrapped lines of the current input."""

# curses does not handle this on its own. Sad.

height, width = self.scr.getmaxyx()

max_y = min(self.iy + (self.ix + len(self.s)) // width + 1, height)

for y in range(self.iy + 1, max_y):

self.scr.move(y, 0)

self.scr.clrtoeol()

def complete(self, tab=False):

"""Get Autocomplete list and window.

Called whenever these should be updated, and called

with tab

"""

if self.paste_mode:

self.scr.touchwin() # TODO necessary?

return

list_win_visible = repl.Repl.complete(self, tab)

if list_win_visible:

try:

self.show_list(

self.matches_iter.matches,

self.arg_pos,

topline=self.funcprops,

formatter=self.matches_iter.completer.format,

)

except curses.error:

# XXX: This is a massive hack, it will go away when I get

# cusswords into a good enough state that we can start

# using it.

self.list_win.border()

self.list_win.refresh()

list_win_visible = False

if not list_win_visible:

self.scr.redrawwin()

self.scr.refresh()

def clrtobol(self):

"""Clear from cursor to beginning of line; usual C-u behaviour"""

self.clear_wrapped_lines()

if not self.cpos:

self.s = ""

else:

self.s = self.s[-self.cpos :]

self.print_line(self.s, clr=True)

self.scr.redrawwin()

self.scr.refresh()

def _get_current_line(self):

return self.s

def _set_current_line(self, line):

self.s = line

current_line = property(

_get_current_line,

_set_current_line,

None,

"The characters of the current line",

)

def cut_to_buffer(self):

"""Clear from cursor to end of line, placing into cut buffer"""

self.cut_buffer = self.s[-self.cpos :]

self.s = self.s[: -self.cpos]

self.cpos = 0

self.print_line(self.s, clr=True)

self.scr.redrawwin()

self.scr.refresh()

def delete(self):

"""Process a del"""

if not self.s:

return

if self.mvc(-1):

self.bs(False)

def echo(self, s, redraw=True):

"""Parse and echo a formatted string with appropriate attributes. It

uses the formatting method as defined in formatter.py to parse the

strings. It won't update the screen if it's reevaluating the code (as it

does with undo)."""

a = get_colpair(self.config, "output")

if "\x01" in s:

rx = re.search("\x01([A-Za-z])([A-Za-z]?)", s)

if rx:

fg = rx.groups()[0]

bg = rx.groups()[1]

col_num = self._C[fg.lower()]

if bg and bg != "I":

col_num *= self._C[bg.lower()]

a = curses.color_pair(int(col_num) + 1)

if bg == "I":

a = a | curses.A_REVERSE

s = re.sub("\x01[A-Za-z][A-Za-z]?", "", s)

if fg.isupper():

a = a | curses.A_BOLD

s = s.replace("\x03", "")

s = s.replace("\x01", "")

# Replace NUL bytes, as addstr raises an exception otherwise

s = s.replace("\0", "")

# Replace \r\n bytes, as addstr remove the current line otherwise

s = s.replace("\r\n", "\n")

self.scr.addstr(s, a)

if redraw and not self.evaluating:

self.scr.refresh()

def end(self, refresh=True):

self.cpos = 0

h, w = gethw()

y, x = divmod(len(self.s) + self.ix, w)

y += self.iy

self.scr.move(y, x)

if refresh:

self.scr.refresh()

return True

def hbegin(self):

"""Replace the active line with first line in history and

increment the index to keep track"""

self.cpos = 0

self.clear_wrapped_lines()

self.rl_history.enter(self.s)

self.s = self.rl_history.first()

self.print_line(self.s, clr=True)

def hend(self):

"""Same as hbegin() but, well, forward"""

self.cpos = 0

self.clear_wrapped_lines()

self.rl_history.enter(self.s)

self.s = self.rl_history.last()

self.print_line(self.s, clr=True)

def back(self):

"""Replace the active line with previous line in history and

increment the index to keep track"""

self.cpos = 0

self.clear_wrapped_lines()

self.rl_history.enter(self.s)

self.s = self.rl_history.back()

self.print_line(self.s, clr=True)

def fwd(self):

"""Same as back() but, well, forward"""

self.cpos = 0

self.clear_wrapped_lines()

self.rl_history.enter(self.s)

self.s = self.rl_history.forward()

self.print_line(self.s, clr=True)

def search(self):

"""Search with the partial matches from the history object."""

self.cpo = 0

self.clear_wrapped_lines()

self.rl_history.enter(self.s)

self.s = self.rl_history.back(start=False, search=True)

self.print_line(self.s, clr=True)

def get_key(self):

key = ""

while True:

try:

key += self.scr.getkey()

# Seems like we get a in the locale's encoding

# encoded string in Python 3 as well, but of

# type str instead of bytes, hence convert it to

# bytes first and decode then

key = key.encode("latin-1").decode(getpreferredencoding())

self.scr.nodelay(False)

except UnicodeDecodeError:

# Yes, that actually kind of sucks, but I don't see another way to get

# input right

self.scr.nodelay(True)

except curses.error:

# I'm quite annoyed with the ambiguity of this exception handler. I previously

# caught "curses.error, x" and accessed x.message and checked that it was "no

# input", which seemed a crappy way of doing it. But then I ran it on a

# different computer and the exception seems to have entirely different

# attributes. So let's hope getkey() doesn't raise any other crazy curses

# exceptions. :)

self.scr.nodelay(False)

# XXX What to do here? Raise an exception?

if key:

return key

else:

if key != "\x00":

t = time.time()

self.paste_mode = (

t - self.last_key_press <= self.config.paste_time

)

self.last_key_press = t

return key

else:

key = ""

finally:

if self.idle:

self.idle(self)

def get_line(self):

"""Get a line of text and return it

This function initialises an empty string and gets the

curses cursor position on the screen and stores it

for the echo() function to use later (I think).

Then it waits for key presses and passes them to p_key(),

which returns None if Enter is pressed (that means "Return",

idiot)."""

self.s = ""

self.rl_history.reset()

self.iy, self.ix = self.scr.getyx()

if not self.paste_mode:

for _ in range(self.next_indentation()):

self.p_key("\t")

self.cpos = 0

while True:

key = self.get_key()

if self.p_key(key) is None:

if self.config.cli_trim_prompts and self.s.startswith(">>> "):

self.s = self.s[4:]

return self.s

def home(self, refresh=True):

self.scr.move(self.iy, self.ix)

self.cpos = len(self.s)

if refresh:

self.scr.refresh()

return True

def lf(self):

"""Process a linefeed character; it only needs to check the

cursor position and move appropriately so it doesn't clear

the current line after the cursor."""

if self.cpos:

for _ in range(self.cpos):

self.mvc(-1)

# Reprint the line (as there was maybe a highlighted paren in it)

self.print_line(self.s, newline=True)

self.echo("\n")

def mkargspec(self, topline, in_arg, down):

"""This figures out what to do with the argspec and puts it nicely into

the list window. It returns the number of lines used to display the

argspec. It's also kind of messy due to it having to call so many

addstr() to get the colouring right, but it seems to be pretty

sturdy."""

r = 3

fn = topline.func

args = topline.argspec.args

kwargs = topline.argspec.defaults

_args = topline.argspec.varargs

_kwargs = topline.argspec.varkwargs

is_bound_method = topline.is_bound_method

kwonly = topline.argspec.kwonly

kwonly_defaults = topline.argspec.kwonly_defaults or dict()

max_w = int(self.scr.getmaxyx()[1] * 0.6)

self.list_win.erase()

self.list_win.resize(3, max_w)

h, w = self.list_win.getmaxyx()

self.list_win.addstr("\n ")

self.list_win.addstr(

fn, get_colpair(self.config, "name") | curses.A_BOLD

)

self.list_win.addstr(": (", get_colpair(self.config, "name"))

maxh = self.scr.getmaxyx()[0]

if is_bound_method and isinstance(in_arg, int):

in_arg += 1

punctuation_colpair = get_colpair(self.config, "punctuation")

for k, i in enumerate(args):

y, x = self.list_win.getyx()

ln = len(str(i))

kw = None

if kwargs and k + 1 > len(args) - len(kwargs):

kw = repr(kwargs[k - (len(args) - len(kwargs))])

ln += len(kw) + 1

if ln + x >= w:

ty = self.list_win.getbegyx()[0]

if not down and ty > 0:

h += 1

self.list_win.mvwin(ty - 1, 1)

self.list_win.resize(h, w)

elif down and h + r < maxh - ty:

h += 1

self.list_win.resize(h, w)

else:

break

r += 1

self.list_win.addstr("\n\t")

if str(i) == "self" and k == 0:

color = get_colpair(self.config, "name")

else:

color = get_colpair(self.config, "token")

if k == in_arg or i == in_arg:

color |= curses.A_BOLD

self.list_win.addstr(str(i), color)

if kw is not None:

self.list_win.addstr("=", punctuation_colpair)

self.list_win.addstr(kw, get_colpair(self.config, "token"))

if k != len(args) - 1:

self.list_win.addstr(", ", punctuation_colpair)

if _args:

if args:

self.list_win.addstr(", ", punctuation_colpair)

self.list_win.addstr(f"*{_args}", get_colpair(self.config, "token"))

if kwonly:

if not _args:

if args:

self.list_win.addstr(", ", punctuation_colpair)

self.list_win.addstr("*", punctuation_colpair)

marker = object()

for arg in kwonly:

self.list_win.addstr(", ", punctuation_colpair)

color = get_colpair(self.config, "token")

if arg == in_arg:

color |= curses.A_BOLD

self.list_win.addstr(arg, color)

default = kwonly_defaults.get(arg, marker)

if default is not marker:

self.list_win.addstr("=", punctuation_colpair)

self.list_win.addstr(

repr(default), get_colpair(self.config, "token")

)

if _kwargs:

if args or _args or kwonly:

self.list_win.addstr(", ", punctuation_colpair)

self.list_win.addstr(

f"**{_kwargs}", get_colpair(self.config, "token")

)

self.list_win.addstr(")", punctuation_colpair)

return r

def mvc(self, i, refresh=True):

"""This method moves the cursor relatively from the current

position, where:

0 == (right) end of current line

length of current line len(self.s) == beginning of current line

and:

current cursor position + i

for positive values of i the cursor will move towards the beginning

of the line, negative values the opposite."""

y, x = self.scr.getyx()

if self.cpos == 0 and i < 0:

return False

if x == self.ix and y == self.iy and i >= 1:

return False

h, w = gethw()

if x - i < 0:

y -= 1

x = w

if x - i >= w:

y += 1

x = 0 + i

self.cpos += i

self.scr.move(y, x - i)

if refresh:

self.scr.refresh()

return True

def p_key(self, key):

"""Process a keypress"""

if key is None:

return ""

config = self.config

if platform.system() == "Windows":

C_BACK = chr(127)

BACKSP = chr(8)

else:

C_BACK = chr(8)

BACKSP = chr(127)

if key == C_BACK: # C-Backspace (on my computer anyway!)

self.clrtobol()

key = "\n"

# Don't return; let it get handled

if key == chr(27): # Escape Key

return ""

if key in (BACKSP, "KEY_BACKSPACE"):

self.bs()

self.complete()

return ""

elif key in key_dispatch[config.delete_key] and not self.s:

# Delete on empty line exits

self.do_exit = True

return None

elif key in ("KEY_DC",) + key_dispatch[config.delete_key]:

self.delete()

self.complete()

# Redraw (as there might have been highlighted parens)

self.print_line(self.s)

return ""

elif key in key_dispatch[config.undo_key]: # C-r

n = self.prompt_undo()

if n > 0:

self.undo(n=n)

return ""

elif key in key_dispatch[config.search_key]:

self.search()

return ""

elif key in ("KEY_UP",) + key_dispatch[config.up_one_line_key]:

# Cursor Up/C-p

self.back()

return ""

elif key in ("KEY_DOWN",) + key_dispatch[config.down_one_line_key]:

# Cursor Down/C-n

self.fwd()

return ""

elif key in ("KEY_LEFT", " ^B", chr(2)): # Cursor Left or ^B

self.mvc(1)

# Redraw (as there might have been highlighted parens)

self.print_line(self.s)

elif key in ("KEY_RIGHT", "^F", chr(6)): # Cursor Right or ^F

self.mvc(-1)

# Redraw (as there might have been highlighted parens)

self.print_line(self.s)

elif key in ("KEY_HOME", "^A", chr(1)): # home or ^A

self.home()

# Redraw (as there might have been highlighted parens)

self.print_line(self.s)

elif key in ("KEY_END", "^E", chr(5)): # end or ^E

self.end()

# Redraw (as there might have been highlighted parens)

self.print_line(self.s)

elif key in ("KEY_NPAGE",): # page_down

self.hend()

self.print_line(self.s)

elif key in ("KEY_PPAGE",): # page_up

self.hbegin()

self.print_line(self.s)

elif key in key_dispatch[config.cut_to_buffer_key]: # cut to buffer

self.cut_to_buffer()

return ""

elif key in key_dispatch[config.yank_from_buffer_key]:

# yank from buffer

self.yank_from_buffer()

return ""

elif key in key_dispatch[config.clear_word_key]:

self.cut_buffer = self.bs_word()

self.complete()

return ""

elif key in key_dispatch[config.clear_line_key]:

self.clrtobol()

return ""

elif key in key_dispatch[config.clear_screen_key]:

# clear all but current line

self.screen_hist = [self.screen_hist[-1]]

self.highlighted_paren = None

self.redraw()

return ""

elif key in key_dispatch[config.exit_key]:

if not self.s:

self.do_exit = True

return None

else:

return ""

elif key in key_dispatch[config.save_key]:

self.write2file()

return ""

elif key in key_dispatch[config.pastebin_key]:

self.pastebin()

return ""

elif key in key_dispatch[config.copy_clipboard_key]:

self.copy2clipboard()

return ""

elif key in key_dispatch[config.last_output_key]:

page(self.stdout_hist[self.prev_block_finished : -4])

return ""

elif key in key_dispatch[config.show_source_key]:

try:

source = self.get_source_of_current_name()

except repl.SourceNotFound as e:

self.statusbar.message(f"{e}")

else:

if config.highlight_show_source:

source = format(

Python3Lexer().get_tokens(source), TerminalFormatter()

)

page(source)

return ""

elif key in ("\n", "\r", "PADENTER"):

self.lf()

return None

elif key == "\t":

return self.tab()

elif key == "KEY_BTAB":

return self.tab(back=True)

elif key in key_dispatch[config.suspend_key]:

if platform.system() != "Windows":

self.suspend()

return ""

else:

self.do_exit = True

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