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cli.py
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2003 lines (1646 loc) · 60.8 KB
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# The MIT License
#
# Copyright (c) 2008 Bob Farrell
# 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