Current File : //snap/core20/2434/lib/python3/dist-packages/urwid/vterm.py
#!/usr/bin/python
#
# Urwid terminal emulation widget
# Copyright (C) 2010 aszlig
# Copyright (C) 2011 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
from __future__ import division, print_function
import os
import sys
import time
import copy
import errno
import select
import struct
import signal
import atexit
import traceback
try:
import pty
import fcntl
import termios
except ImportError:
pass # windows
from urwid import util
from urwid.escape import DEC_SPECIAL_CHARS, ALT_DEC_SPECIAL_CHARS
from urwid.canvas import Canvas
from urwid.widget import Widget, BOX
from urwid.display_common import AttrSpec, RealTerminal, _BASIC_COLORS
from urwid.compat import ord2, chr2, B, bytes, PYTHON3, xrange
ESC = chr(27)
KEY_TRANSLATIONS = {
'enter': chr(13),
'backspace': chr(127),
'tab': chr(9),
'esc': ESC,
'up': ESC + '[A',
'down': ESC + '[B',
'right': ESC + '[C',
'left': ESC + '[D',
'home': ESC + '[1~',
'insert': ESC + '[2~',
'delete': ESC + '[3~',
'end': ESC + '[4~',
'page up': ESC + '[5~',
'page down': ESC + '[6~',
'f1': ESC + '[[A',
'f2': ESC + '[[B',
'f3': ESC + '[[C',
'f4': ESC + '[[D',
'f5': ESC + '[[E',
'f6': ESC + '[17~',
'f7': ESC + '[18~',
'f8': ESC + '[19~',
'f9': ESC + '[20~',
'f10': ESC + '[21~',
'f11': ESC + '[23~',
'f12': ESC + '[24~',
}
KEY_TRANSLATIONS_DECCKM = {
'up': ESC + 'OA',
'down': ESC + 'OB',
'right': ESC + 'OC',
'left': ESC + 'OD',
'f1': ESC + 'OP',
'f2': ESC + 'OQ',
'f3': ESC + 'OR',
'f4': ESC + 'OS',
'f5': ESC + '[15~',
}
CSI_COMMANDS = {
# possible values:
# None -> ignore sequence
# (<minimum number of args>, <fallback if no argument>, callback)
# ('alias', <symbol>)
#
# while callback is executed as:
# callback(<instance of TermCanvas>, arguments, has_question_mark)
B('@'): (1, 1, lambda s, number, q: s.insert_chars(chars=number[0])),
B('A'): (1, 1, lambda s, rows, q: s.move_cursor(0, -rows[0], relative=True)),
B('B'): (1, 1, lambda s, rows, q: s.move_cursor(0, rows[0], relative=True)),
B('C'): (1, 1, lambda s, cols, q: s.move_cursor(cols[0], 0, relative=True)),
B('D'): (1, 1, lambda s, cols, q: s.move_cursor(-cols[0], 0, relative=True)),
B('E'): (1, 1, lambda s, rows, q: s.move_cursor(0, rows[0], relative_y=True)),
B('F'): (1, 1, lambda s, rows, q: s.move_cursor(0, -rows[0], relative_y=True)),
B('G'): (1, 1, lambda s, col, q: s.move_cursor(col[0] - 1, 0, relative_y=True)),
B('H'): (2, 1, lambda s, x_y, q: s.move_cursor(x_y[1] - 1, x_y[0] - 1)),
B('J'): (1, 0, lambda s, mode, q: s.csi_erase_display(mode[0])),
B('K'): (1, 0, lambda s, mode, q: s.csi_erase_line(mode[0])),
B('L'): (1, 1, lambda s, number, q: s.insert_lines(lines=number[0])),
B('M'): (1, 1, lambda s, number, q: s.remove_lines(lines=number[0])),
B('P'): (1, 1, lambda s, number, q: s.remove_chars(chars=number[0])),
B('X'): (1, 1, lambda s, number, q: s.erase(s.term_cursor,
(s.term_cursor[0]+number[0] - 1,
s.term_cursor[1]))),
B('a'): ('alias', B('C')),
B('c'): (0, 0, lambda s, none, q: s.csi_get_device_attributes(q)),
B('d'): (1, 1, lambda s, row, q: s.move_cursor(0, row[0] - 1, relative_x=True)),
B('e'): ('alias', B('B')),
B('f'): ('alias', B('H')),
B('g'): (1, 0, lambda s, mode, q: s.csi_clear_tabstop(mode[0])),
B('h'): (1, 0, lambda s, modes, q: s.csi_set_modes(modes, q)),
B('l'): (1, 0, lambda s, modes, q: s.csi_set_modes(modes, q, reset=True)),
B('m'): (1, 0, lambda s, attrs, q: s.csi_set_attr(attrs)),
B('n'): (1, 0, lambda s, mode, q: s.csi_status_report(mode[0])),
B('q'): (1, 0, lambda s, mode, q: s.csi_set_keyboard_leds(mode[0])),
B('r'): (2, 0, lambda s, t_b, q: s.csi_set_scroll(t_b[0], t_b[1])),
B('s'): (0, 0, lambda s, none, q: s.save_cursor()),
B('u'): (0, 0, lambda s, none, q: s.restore_cursor()),
B('`'): ('alias', B('G')),
}
CHARSET_DEFAULT = 1
CHARSET_UTF8 = 2
class TermModes(object):
def __init__(self):
self.reset()
def reset(self):
# ECMA-48
self.display_ctrl = False
self.insert = False
self.lfnl = False
# DEC private modes
self.keys_decckm = False
self.reverse_video = False
self.constrain_scrolling = False
self.autowrap = True
self.visible_cursor = True
# charset stuff
self.main_charset = CHARSET_DEFAULT
class TermCharset(object):
MAPPING = {
'default': None,
'vt100': '0',
'ibmpc': 'U',
'user': None,
}
def __init__(self):
self._g = [
'default',
'vt100',
]
self._sgr_mapping = False
self.activate(0)
def define(self, g, charset):
"""
Redefine G'g' with new mapping.
"""
self._g[g] = charset
self.activate(g=self.active)
def activate(self, g):
"""
Activate the given charset slot.
"""
self.active = g
self.current = self.MAPPING.get(self._g[g], None)
def set_sgr_ibmpc(self):
"""
Set graphics rendition mapping to IBM PC CP437.
"""
self._sgr_mapping = True
def reset_sgr_ibmpc(self):
"""
Reset graphics rendition mapping to IBM PC CP437.
"""
self._sgr_mapping = False
self.activate(g=self.active)
def apply_mapping(self, char):
if self._sgr_mapping or self._g[self.active] == 'ibmpc':
dec_pos = DEC_SPECIAL_CHARS.find(char.decode('cp437'))
if dec_pos >= 0:
self.current = '0'
return str(ALT_DEC_SPECIAL_CHARS[dec_pos])
else:
self.current = 'U'
return char
else:
return char
class TermScroller(list):
"""
List subclass that handles the terminal scrollback buffer,
truncating it as necessary.
"""
SCROLLBACK_LINES = 10000
def trunc(self):
if len(self) >= self.SCROLLBACK_LINES:
self.pop(0)
def append(self, obj):
self.trunc()
super(TermScroller, self).append(obj)
def insert(self, idx, obj):
self.trunc()
super(TermScroller, self).insert(idx, obj)
def extend(self, seq):
self.trunc()
super(TermScroller, self).extend(seq)
class TermCanvas(Canvas):
cacheable = False
def __init__(self, width, height, widget):
Canvas.__init__(self)
self.width, self.height = width, height
self.widget = widget
self.modes = widget.term_modes
self.scrollback_buffer = TermScroller()
self.scrolling_up = 0
self.utf8_eat_bytes = None
self.utf8_buffer = bytes()
self.coords["cursor"] = (0, 0, None)
self.reset()
def set_term_cursor(self, x=None, y=None):
"""
Set terminal cursor to x/y and update canvas cursor. If one or both axes
are omitted, use the values of the current position.
"""
if x is None:
x = self.term_cursor[0]
if y is None:
y = self.term_cursor[1]
self.term_cursor = self.constrain_coords(x, y)
if self.modes.visible_cursor and self.scrolling_up < self.height - y:
self.cursor = (x, y + self.scrolling_up)
else:
self.cursor = None
def reset_scroll(self):
"""
Reset scrolling region to full terminal size.
"""
self.scrollregion_start = 0
self.scrollregion_end = self.height - 1
def scroll_buffer(self, up=True, reset=False, lines=None):
"""
Scroll the scrolling buffer up (up=True) or down (up=False) the given
amount of lines or half the screen height.
If just 'reset' is True, set the scrollbuffer view to the current
terminal content.
"""
if reset:
self.scrolling_up = 0
self.set_term_cursor()
return
if lines is None:
lines = self.height // 2
if not up:
lines = -lines
maxscroll = len(self.scrollback_buffer)
self.scrolling_up += lines
if self.scrolling_up > maxscroll:
self.scrolling_up = maxscroll
elif self.scrolling_up < 0:
self.scrolling_up = 0
self.set_term_cursor()
def reset(self):
"""
Reset the terminal.
"""
self.escbuf = bytes()
self.within_escape = False
self.parsestate = 0
self.attrspec = None
self.charset = TermCharset()
self.saved_cursor = None
self.saved_attrs = None
self.is_rotten_cursor = False
self.reset_scroll()
self.init_tabstops()
# terminal modes
self.modes.reset()
# initialize self.term
self.clear()
def init_tabstops(self, extend=False):
tablen, mod = divmod(self.width, 8)
if mod > 0:
tablen += 1
if extend:
while len(self.tabstops) < tablen:
self.tabstops.append(1 << 0)
else:
self.tabstops = [1 << 0] * tablen
def set_tabstop(self, x=None, remove=False, clear=False):
if clear:
for tab in xrange(len(self.tabstops)):
self.tabstops[tab] = 0
return
if x is None:
x = self.term_cursor[0]
div, mod = divmod(x, 8)
if remove:
self.tabstops[div] &= ~(1 << mod)
else:
self.tabstops[div] |= (1 << mod)
def is_tabstop(self, x=None):
if x is None:
x = self.term_cursor[0]
div, mod = divmod(x, 8)
return (self.tabstops[div] & (1 << mod)) > 0
def empty_line(self, char=B(' ')):
return [self.empty_char(char)] * self.width
def empty_char(self, char=B(' ')):
return (self.attrspec, self.charset.current, char)
def addstr(self, data):
if self.width <= 0 or self.height <= 0:
# not displayable, do nothing!
return
for byte in data:
self.addbyte(ord2(byte))
def resize(self, width, height):
"""
Resize the terminal to the given width and height.
"""
x, y = self.term_cursor
if width > self.width:
# grow
for y in xrange(self.height):
self.term[y] += [self.empty_char()] * (width - self.width)
elif width < self.width:
# shrink
for y in xrange(self.height):
self.term[y] = self.term[y][:width]
self.width = width
if height > self.height:
# grow
for y in xrange(self.height, height):
try:
last_line = self.scrollback_buffer.pop()
except IndexError:
# nothing in scrollback buffer, append an empty line
self.term.append(self.empty_line())
self.scrollregion_end += 1
continue
# adjust x axis of scrollback buffer to the current width
if len(last_line) < self.width:
last_line += [self.empty_char()] * \
(self.width - len(last_line))
else:
last_line = last_line[:self.width]
y += 1
self.term.insert(0, last_line)
elif height < self.height:
# shrink
for y in xrange(height, self.height):
self.scrollback_buffer.append(self.term.pop(0))
self.height = height
self.reset_scroll()
x, y = self.constrain_coords(x, y)
self.set_term_cursor(x, y)
# extend tabs
self.init_tabstops(extend=True)
def set_g01(self, char, mod):
"""
Set G0 or G1 according to 'char' and modifier 'mod'.
"""
if self.modes.main_charset != CHARSET_DEFAULT:
return
if mod == B('('):
g = 0
else:
g = 1
if char == B('0'):
cset = 'vt100'
elif char == B('U'):
cset = 'ibmpc'
elif char == B('K'):
cset = 'user'
else:
cset = 'default'
self.charset.define(g, cset)
def parse_csi(self, char):
"""
Parse ECMA-48 CSI (Control Sequence Introducer) sequences.
"""
qmark = self.escbuf.startswith(B('?'))
escbuf = []
for arg in self.escbuf[qmark and 1 or 0:].split(B(';')):
try:
num = int(arg)
except ValueError:
num = None
escbuf.append(num)
if CSI_COMMANDS[char] is not None:
if CSI_COMMANDS[char][0] == 'alias':
csi_cmd = CSI_COMMANDS[(CSI_COMMANDS[char][1])]
else:
csi_cmd = CSI_COMMANDS[char]
number_of_args, default_value, cmd = csi_cmd
while len(escbuf) < number_of_args:
escbuf.append(default_value)
for i in xrange(len(escbuf)):
if escbuf[i] is None or escbuf[i] == 0:
escbuf[i] = default_value
try:
cmd(self, escbuf, qmark)
except ValueError:
# ignore commands that don't match the
# unpacked tuples in CSI_COMMANDS.
pass
def parse_noncsi(self, char, mod=None):
"""
Parse escape sequences which are not CSI.
"""
if mod == B('#') and char == B('8'):
self.decaln()
elif mod == B('%'): # select main character set
if char == B('@'):
self.modes.main_charset = CHARSET_DEFAULT
elif char in B('G8'):
# 8 is obsolete and only for backwards compatibility
self.modes.main_charset = CHARSET_UTF8
elif mod == B('(') or mod == B(')'): # define G0/G1
self.set_g01(char, mod)
elif char == B('M'): # reverse line feed
self.linefeed(reverse=True)
elif char == B('D'): # line feed
self.linefeed()
elif char == B('c'): # reset terminal
self.reset()
elif char == B('E'): # newline
self.newline()
elif char == B('H'): # set tabstop
self.set_tabstop()
elif char == B('Z'): # DECID
self.widget.respond(ESC + '[?6c')
elif char == B('7'): # save current state
self.save_cursor(with_attrs=True)
elif char == B('8'): # restore current state
self.restore_cursor(with_attrs=True)
def parse_osc(self, buf):
"""
Parse operating system command.
"""
if buf.startswith(B(';')): # set window title and icon
self.widget.set_title(buf[1:])
elif buf.startswith(B('3;')): # set window title
self.widget.set_title(buf[2:])
def parse_escape(self, char):
if self.parsestate == 1:
# within CSI
if char in CSI_COMMANDS.keys():
self.parse_csi(char)
self.parsestate = 0
elif char in B('0123456789;') or (not self.escbuf and char == B('?')):
self.escbuf += char
return
elif self.parsestate == 0 and char == B(']'):
# start of OSC
self.escbuf = bytes()
self.parsestate = 2
return
elif self.parsestate == 2 and char == B("\x07"):
# end of OSC
self.parse_osc(self.escbuf.lstrip(B('0')))
elif self.parsestate == 2 and self.escbuf[-1:] + char == B(ESC + '\\'):
# end of OSC
self.parse_osc(self.escbuf[:-1].lstrip(B('0')))
elif self.parsestate == 2 and self.escbuf.startswith(B('P')) and \
len(self.escbuf) == 8:
# set palette (ESC]Pnrrggbb)
pass
elif self.parsestate == 2 and not self.escbuf and char == B('R'):
# reset palette
pass
elif self.parsestate == 2:
self.escbuf += char
return
elif self.parsestate == 0 and char == B('['):
# start of CSI
self.escbuf = bytes()
self.parsestate = 1
return
elif self.parsestate == 0 and char in (B('%'), B('#'), B('('), B(')')):
# non-CSI sequence
self.escbuf = char
self.parsestate = 3
return
elif self.parsestate == 3:
self.parse_noncsi(char, self.escbuf)
elif char in (B('c'), B('D'), B('E'), B('H'), B('M'), B('Z'), B('7'), B('8'), B('>'), B('=')):
self.parse_noncsi(char)
self.leave_escape()
def leave_escape(self):
self.within_escape = False
self.parsestate = 0
self.escbuf = bytes()
def get_utf8_len(self, bytenum):
"""
Process startbyte and return the number of bytes following it to get a
valid UTF-8 multibyte sequence.
bytenum -- an integer ordinal
"""
length = 0
while bytenum & 0x40:
bytenum <<= 1
length += 1
return length
def addbyte(self, byte):
"""
Parse main charset and add the processed byte(s) to the terminal state
machine.
byte -- an integer ordinal
"""
if (self.modes.main_charset == CHARSET_UTF8 or
util._target_encoding == 'utf8'):
if byte >= 0xc0:
# start multibyte sequence
self.utf8_eat_bytes = self.get_utf8_len(byte)
self.utf8_buffer = chr2(byte)
return
elif 0x80 <= byte < 0xc0 and self.utf8_eat_bytes is not None:
if self.utf8_eat_bytes > 1:
# continue multibyte sequence
self.utf8_eat_bytes -= 1
self.utf8_buffer += chr2(byte)
return
else:
# end multibyte sequence
self.utf8_eat_bytes = None
sequence = (self.utf8_buffer+chr2(byte)).decode('utf-8', 'ignore')
if len(sequence) == 0:
# invalid multibyte sequence, stop processing
return
char = sequence.encode(util._target_encoding, 'replace')
else:
self.utf8_eat_bytes = None
char = chr2(byte)
else:
char = chr2(byte)
self.process_char(char)
def process_char(self, char):
"""
Process a single character (single- and multi-byte).
char -- a byte string
"""
x, y = self.term_cursor
if isinstance(char, int):
char = chr(char)
dc = self.modes.display_ctrl
if char == B("\x1b") and self.parsestate != 2: # escape
self.within_escape = True
elif not dc and char == B("\x0d"): # carriage return
self.carriage_return()
elif not dc and char == B("\x0f"): # activate G0
self.charset.activate(0)
elif not dc and char == B("\x0e"): # activate G1
self.charset.activate(1)
elif not dc and char in B("\x0a\x0b\x0c"): # line feed
self.linefeed()
if self.modes.lfnl:
self.carriage_return()
elif not dc and char == B("\x09"): # char tab
self.tab()
elif not dc and char == B("\x08"): # backspace
if x > 0:
self.set_term_cursor(x - 1, y)
elif not dc and char == B("\x07") and self.parsestate != 2: # beep
# we need to check if we're in parsestate 2, as an OSC can be
# terminated by the BEL character!
self.widget.beep()
elif not dc and char in B("\x18\x1a"): # CAN/SUB
self.leave_escape()
elif not dc and char in B("\x00\x7f"): # NUL/DEL
pass # this is ignored
elif self.within_escape:
self.parse_escape(char)
elif not dc and char == B("\x9b"): # CSI (equivalent to "ESC [")
self.within_escape = True
self.escbuf = bytes()
self.parsestate = 1
else:
self.push_cursor(char)
def set_char(self, char, x=None, y=None):
"""
Set character of either the current cursor position
or a position given by 'x' and/or 'y' to 'char'.
"""
if x is None:
x = self.term_cursor[0]
if y is None:
y = self.term_cursor[1]
x, y = self.constrain_coords(x, y)
self.term[y][x] = (self.attrspec, self.charset.current, char)
def constrain_coords(self, x, y, ignore_scrolling=False):
"""
Checks if x/y are within the terminal and returns the corrected version.
If 'ignore_scrolling' is set, constrain within the full size of the
screen and not within scrolling region.
"""
if x >= self.width:
x = self.width - 1
elif x < 0:
x = 0
if self.modes.constrain_scrolling and not ignore_scrolling:
if y > self.scrollregion_end:
y = self.scrollregion_end
elif y < self.scrollregion_start:
y = self.scrollregion_start
else:
if y >= self.height:
y = self.height - 1
elif y < 0:
y = 0
return x, y
def linefeed(self, reverse=False):
"""
Move the cursor down (or up if reverse is True) one line but don't reset
horizontal position.
"""
x, y = self.term_cursor
if reverse:
if y <= 0 < self.scrollregion_start:
pass
elif y == self.scrollregion_start:
self.scroll(reverse=True)
else:
y -= 1
else:
if y >= self.height - 1 > self.scrollregion_end:
pass
elif y == self.scrollregion_end:
self.scroll()
else:
y += 1
self.set_term_cursor(x, y)
def carriage_return(self):
self.set_term_cursor(0, self.term_cursor[1])
def newline(self):
"""
Do a carriage return followed by a line feed.
"""
self.carriage_return()
self.linefeed()
def move_cursor(self, x, y, relative_x=False, relative_y=False,
relative=False):
"""
Move cursor to position x/y while constraining terminal sizes.
If 'relative' is True, x/y is relative to the current cursor
position. 'relative_x' and 'relative_y' is the same but just with
the corresponding axis.
"""
if relative:
relative_y = relative_x = True
if relative_x:
x = self.term_cursor[0] + x
if relative_y:
y = self.term_cursor[1] + y
elif self.modes.constrain_scrolling:
y += self.scrollregion_start
self.set_term_cursor(x, y)
def push_char(self, char, x, y):
"""
Push one character to current position and advance cursor to x/y.
"""
if char is not None:
char = self.charset.apply_mapping(char)
if self.modes.insert:
self.insert_chars(char=char)
else:
self.set_char(char)
self.set_term_cursor(x, y)
def push_cursor(self, char=None):
"""
Move cursor one character forward wrapping lines as needed.
If 'char' is given, put the character into the former position.
"""
x, y = self.term_cursor
if self.modes.autowrap:
if x + 1 >= self.width and not self.is_rotten_cursor:
# "rotten cursor" - this is when the cursor gets to the rightmost
# position of the screen, the cursor position remains the same but
# one last set_char() is allowed for that piece of sh^H^H"border".
self.is_rotten_cursor = True
self.push_char(char, x, y)
else:
x += 1
if x >= self.width and self.is_rotten_cursor:
if y >= self.scrollregion_end:
self.scroll()
else:
y += 1
x = 1
self.set_term_cursor(0, y)
self.push_char(char, x, y)
self.is_rotten_cursor = False
else:
if x + 1 < self.width:
x += 1
self.is_rotten_cursor = False
self.push_char(char, x, y)
def save_cursor(self, with_attrs=False):
self.saved_cursor = tuple(self.term_cursor)
if with_attrs:
self.saved_attrs = (copy.copy(self.attrspec),
copy.copy(self.charset))
def restore_cursor(self, with_attrs=False):
if self.saved_cursor is None:
return
x, y = self.saved_cursor
self.set_term_cursor(x, y)
if with_attrs and self.saved_attrs is not None:
self.attrspec, self.charset = (copy.copy(self.saved_attrs[0]),
copy.copy(self.saved_attrs[1]))
def tab(self, tabstop=8):
"""
Moves cursor to the next 'tabstop' filling everything in between
with spaces.
"""
x, y = self.term_cursor
while x < self.width - 1:
self.set_char(B(" "))
x += 1
if self.is_tabstop(x):
break
self.is_rotten_cursor = False
self.set_term_cursor(x, y)
def scroll(self, reverse=False):
"""
Append a new line at the bottom and put the topmost line into the
scrollback buffer.
If reverse is True, do exactly the opposite, but don't save into
scrollback buffer.
"""
if reverse:
self.term.pop(self.scrollregion_end)
self.term.insert(self.scrollregion_start, self.empty_line())
else:
killed = self.term.pop(self.scrollregion_start)
self.scrollback_buffer.append(killed)
self.term.insert(self.scrollregion_end, self.empty_line())
def decaln(self):
"""
DEC screen alignment test: Fill screen with E's.
"""
for row in xrange(self.height):
self.term[row] = self.empty_line('E')
def blank_line(self, row):
"""
Blank a single line at the specified row, without modifying other lines.
"""
self.term[row] = self.empty_line()
def insert_chars(self, position=None, chars=1, char=None):
"""
Insert 'chars' number of either empty characters - or those specified by
'char' - before 'position' (or the current position if not specified)
pushing subsequent characters of the line to the right without wrapping.
"""
if position is None:
position = self.term_cursor
if chars == 0:
chars = 1
if char is None:
char = self.empty_char()
else:
char = (self.attrspec, self.charset.current, char)
x, y = position
while chars > 0:
self.term[y].insert(x, char)
self.term[y].pop()
chars -= 1
def remove_chars(self, position=None, chars=1):
"""
Remove 'chars' number of empty characters from 'position' (or the current
position if not specified) pulling subsequent characters of the line to
the left without joining any subsequent lines.
"""
if position is None:
position = self.term_cursor
if chars == 0:
chars = 1
x, y = position
while chars > 0:
self.term[y].pop(x)
self.term[y].append(self.empty_char())
chars -= 1
def insert_lines(self, row=None, lines=1):
"""
Insert 'lines' of empty lines after the specified row, pushing all
subsequent lines to the bottom. If no 'row' is specified, the current
row is used.
"""
if row is None:
row = self.term_cursor[1]
else:
row = self.scrollregion_start
if lines == 0:
lines = 1
while lines > 0:
self.term.insert(row, self.empty_line())
self.term.pop(self.scrollregion_end)
lines -= 1
def remove_lines(self, row=None, lines=1):
"""
Remove 'lines' number of lines at the specified row, pulling all
subsequent lines to the top. If no 'row' is specified, the current row
is used.
"""
if row is None:
row = self.term_cursor[1]
else:
row = self.scrollregion_start
if lines == 0:
lines = 1
while lines > 0:
self.term.pop(row)
self.term.insert(self.scrollregion_end, self.empty_line())
lines -= 1
def erase(self, start, end):
"""
Erase a region of the terminal. The 'start' tuple (x, y) defines the
starting position of the erase, while end (x, y) the last position.
For example if the terminal size is 4x3, start=(1, 1) and end=(1, 2)
would erase the following region:
....
.XXX
XX..
"""
sx, sy = self.constrain_coords(*start)
ex, ey = self.constrain_coords(*end)
# within a single row
if sy == ey:
for x in xrange(sx, ex + 1):
self.term[sy][x] = self.empty_char()
return
# spans multiple rows
y = sy
while y <= ey:
if y == sy:
for x in xrange(sx, self.width):
self.term[y][x] = self.empty_char()
elif y == ey:
for x in xrange(ex + 1):
self.term[y][x] = self.empty_char()
else:
self.blank_line(y)
y += 1
def sgi_to_attrspec(self, attrs, fg, bg, attributes):
"""
Parse SGI sequence and return an AttrSpec representing the sequence
including all earlier sequences specified as 'fg', 'bg' and
'attributes'.
"""
for attr in attrs:
if 30 <= attr <= 37:
fg = attr - 30
elif 40 <= attr <= 47:
bg = attr - 40
elif attr == 38:
# set default foreground color, set underline
attributes.add('underline')
fg = None
elif attr == 39:
# set default foreground color, remove underline
attributes.discard('underline')
fg = None
elif attr == 49:
# set default background color
bg = None
elif attr == 10:
self.charset.reset_sgr_ibmpc()
self.modes.display_ctrl = False
elif attr in (11, 12):
self.charset.set_sgr_ibmpc()
self.modes.display_ctrl = True
# set attributes
elif attr == 1:
attributes.add('bold')
elif attr == 4:
attributes.add('underline')
elif attr == 5:
attributes.add('blink')
elif attr == 7:
attributes.add('standout')
# unset attributes
elif attr == 24:
attributes.discard('underline')
elif attr == 25:
attributes.discard('blink')
elif attr == 27:
attributes.discard('standout')
elif attr == 0:
# clear all attributes
fg = bg = None
attributes.clear()
if 'bold' in attributes and fg is not None:
fg += 8
def _defaulter(color):
if color is None:
return 'default'
else:
return _BASIC_COLORS[color]
fg = _defaulter(fg)
bg = _defaulter(bg)
if len(attributes) > 0:
fg = ','.join([fg] + list(attributes))
if fg == 'default' and bg == 'default':
return None
else:
return AttrSpec(fg, bg)
def csi_set_attr(self, attrs):
"""
Set graphics rendition.
"""
if attrs[-1] == 0:
self.attrspec = None
attributes = set()
if self.attrspec is None:
fg = bg = None
else:
# set default values from previous attrspec
if 'default' in self.attrspec.foreground:
fg = None
else:
fg = self.attrspec.foreground_number
if fg >= 8: fg -= 8
if 'default' in self.attrspec.background:
bg = None
else:
bg = self.attrspec.background_number
if bg >= 8: bg -= 8
for attr in ('bold', 'underline', 'blink', 'standout'):
if not getattr(self.attrspec, attr):
continue
attributes.add(attr)
attrspec = self.sgi_to_attrspec(attrs, fg, bg, attributes)
if self.modes.reverse_video:
self.attrspec = self.reverse_attrspec(attrspec)
else:
self.attrspec = attrspec
def reverse_attrspec(self, attrspec, undo=False):
"""
Put standout mode to the 'attrspec' given and remove it if 'undo' is
True.
"""
if attrspec is None:
attrspec = AttrSpec('default', 'default')
attrs = [fg.strip() for fg in attrspec.foreground.split(',')]
if 'standout' in attrs and undo:
attrs.remove('standout')
attrspec.foreground = ','.join(attrs)
elif 'standout' not in attrs and not undo:
attrs.append('standout')
attrspec.foreground = ','.join(attrs)
return attrspec
def reverse_video(self, undo=False):
"""
Reverse video/scanmode (DECSCNM) by swapping fg and bg colors.
"""
for y in xrange(self.height):
for x in xrange(self.width):
char = self.term[y][x]
attrs = self.reverse_attrspec(char[0], undo=undo)
self.term[y][x] = (attrs,) + char[1:]
def set_mode(self, mode, flag, qmark, reset):
"""
Helper method for csi_set_modes: set single mode.
"""
if qmark:
# DEC private mode
if mode == 1:
# cursor keys send an ESC O prefix, rather than ESC [
self.modes.keys_decckm = flag
elif mode == 3:
# deccolm just clears the screen
self.clear()
elif mode == 5:
if self.modes.reverse_video != flag:
self.reverse_video(undo=not flag)
self.modes.reverse_video = flag
elif mode == 6:
self.modes.constrain_scrolling = flag
self.set_term_cursor(0, 0)
elif mode == 7:
self.modes.autowrap = flag
elif mode == 25:
self.modes.visible_cursor = flag
self.set_term_cursor()
else:
# ECMA-48
if mode == 3:
self.modes.display_ctrl = flag
elif mode == 4:
self.modes.insert = flag
elif mode == 20:
self.modes.lfnl = flag
def csi_set_modes(self, modes, qmark, reset=False):
"""
Set (DECSET/ECMA-48) or reset modes (DECRST/ECMA-48) if reset is True.
"""
flag = not reset
for mode in modes:
self.set_mode(mode, flag, qmark, reset)
def csi_set_scroll(self, top=0, bottom=0):
"""
Set scrolling region, 'top' is the line number of first line in the
scrolling region. 'bottom' is the line number of bottom line. If both
are set to 0, the whole screen will be used (default).
"""
if top == 0:
top = 1
if bottom == 0:
bottom = self.height
if top < bottom <= self.height:
self.scrollregion_start = self.constrain_coords(
0, top - 1, ignore_scrolling=True
)[1]
self.scrollregion_end = self.constrain_coords(
0, bottom - 1, ignore_scrolling=True
)[1]
self.set_term_cursor(0, 0)
def csi_clear_tabstop(self, mode=0):
"""
Clear tabstop at current position or if 'mode' is 3, delete all
tabstops.
"""
if mode == 0:
self.set_tabstop(remove=True)
elif mode == 3:
self.set_tabstop(clear=True)
def csi_get_device_attributes(self, qmark):
"""
Report device attributes (what are you?). In our case, we'll report
ourself as a VT102 terminal.
"""
if not qmark:
self.widget.respond(ESC + '[?6c')
def csi_status_report(self, mode):
"""
Report various information about the terminal status.
Information is queried by 'mode', where possible values are:
5 -> device status report
6 -> cursor position report
"""
if mode == 5:
# terminal OK
self.widget.respond(ESC + '[0n')
elif mode == 6:
x, y = self.term_cursor
self.widget.respond(ESC + '[%d;%dR' % (y + 1, x + 1))
def csi_erase_line(self, mode):
"""
Erase current line, modes are:
0 -> erase from cursor to end of line.
1 -> erase from start of line to cursor.
2 -> erase whole line.
"""
x, y = self.term_cursor
if mode == 0:
self.erase(self.term_cursor, (self.width - 1, y))
elif mode == 1:
self.erase((0, y), (x, y))
elif mode == 2:
self.blank_line(y)
def csi_erase_display(self, mode):
"""
Erase display, modes are:
0 -> erase from cursor to end of display.
1 -> erase from start to cursor.
2 -> erase the whole display.
"""
if mode == 0:
self.erase(self.term_cursor, (self.width - 1, self.height - 1))
if mode == 1:
self.erase((0, 0), (self.term_cursor[0] - 1, self.term_cursor[1]))
elif mode == 2:
self.clear(cursor=self.term_cursor)
def csi_set_keyboard_leds(self, mode=0):
"""
Set keyboard LEDs, modes are:
0 -> clear all LEDs
1 -> set scroll lock LED
2 -> set num lock LED
3 -> set caps lock LED
This currently just emits a signal, so it can be processed by another
widget or the main application.
"""
states = {
0: 'clear',
1: 'scroll_lock',
2: 'num_lock',
3: 'caps_lock',
}
if mode in states:
self.widget.leds(states[mode])
def clear(self, cursor=None):
"""
Clears the whole terminal screen and resets the cursor position
to (0, 0) or to the coordinates given by 'cursor'.
"""
self.term = [self.empty_line() for x in xrange(self.height)]
if cursor is None:
self.set_term_cursor(0, 0)
else:
self.set_term_cursor(*cursor)
def cols(self):
return self.width
def rows(self):
return self.height
def content(self, trim_left=0, trim_right=0, cols=None, rows=None,
attr_map=None):
if self.scrolling_up == 0:
for line in self.term:
yield line
else:
buf = self.scrollback_buffer + self.term
for line in buf[-(self.height+self.scrolling_up):-self.scrolling_up]:
yield line
def content_delta(self, other):
if other is self:
return [self.cols()]*self.rows()
return self.content()
class Terminal(Widget):
_selectable = True
_sizing = frozenset([BOX])
signals = ['closed', 'beep', 'leds', 'title']
def __init__(self, command, env=None, main_loop=None, escape_sequence=None):
"""
A terminal emulator within a widget.
'command' is the command to execute inside the terminal, provided as a
list of the command followed by its arguments. If 'command' is None,
the command is the current user's shell. You can also provide a callable
instead of a command, which will be executed in the subprocess.
'env' can be used to pass custom environment variables. If omitted,
os.environ is used.
'main_loop' should be provided, because the canvas state machine needs
to act on input from the PTY master device. This object must have
watch_file and remove_watch_file methods.
'escape_sequence' is the urwid key symbol which should be used to break
out of the terminal widget. If it's not specified, "ctrl a" is used.
"""
self.__super.__init__()
if escape_sequence is None:
self.escape_sequence = "ctrl a"
else:
self.escape_sequence = escape_sequence
if env is None:
self.env = dict(os.environ)
else:
self.env = dict(env)
if command is None:
self.command = [self.env.get('SHELL', '/bin/sh')]
else:
self.command = command
self.keygrab = False
self.last_key = None
self.response_buffer = []
self.term_modes = TermModes()
self.main_loop = main_loop
self.master = None
self.pid = None
self.width = None
self.height = None
self.term = None
self.has_focus = False
self.terminated = False
def spawn(self):
env = self.env
env['TERM'] = 'linux'
self.pid, self.master = pty.fork()
if self.pid == 0:
if callable(self.command):
try:
try:
self.command()
except:
sys.stderr.write(traceback.format_exc())
sys.stderr.flush()
finally:
os._exit(0)
else:
os.execvpe(self.command[0], self.command, env)
if self.main_loop is None:
fcntl.fcntl(self.master, fcntl.F_SETFL, os.O_NONBLOCK)
atexit.register(self.terminate)
def terminate(self):
if self.terminated:
return
self.terminated = True
self.remove_watch()
self.change_focus(False)
if self.pid > 0:
self.set_termsize(0, 0)
for sig in (signal.SIGHUP, signal.SIGCONT, signal.SIGINT,
signal.SIGTERM, signal.SIGKILL):
try:
os.kill(self.pid, sig)
pid, status = os.waitpid(self.pid, os.WNOHANG)
except OSError:
break
if pid == 0:
break
time.sleep(0.1)
try:
os.waitpid(self.pid, 0)
except OSError:
pass
os.close(self.master)
def beep(self):
self._emit('beep')
def leds(self, which):
self._emit('leds', which)
def respond(self, string):
"""
Respond to the underlying application with 'string'.
"""
self.response_buffer.append(string)
def flush_responses(self):
for string in self.response_buffer:
os.write(self.master, string.encode('ascii'))
self.response_buffer = []
def set_termsize(self, width, height):
winsize = struct.pack("HHHH", height, width, 0, 0)
fcntl.ioctl(self.master, termios.TIOCSWINSZ, winsize)
def touch_term(self, width, height):
process_opened = False
if self.pid is None:
self.spawn()
process_opened = True
if self.width == width and self.height == height:
return
self.set_termsize(width, height)
if not self.term:
self.term = TermCanvas(width, height, self)
else:
self.term.resize(width, height)
self.width = width
self.height = height
if process_opened:
self.add_watch()
def set_title(self, title):
self._emit('title', title)
def change_focus(self, has_focus):
"""
Ignore SIGINT if this widget has focus.
"""
if self.terminated or self.has_focus == has_focus:
return
self.has_focus = has_focus
if has_focus:
self.old_tios = RealTerminal().tty_signal_keys()
RealTerminal().tty_signal_keys(*(['undefined'] * 5))
else:
RealTerminal().tty_signal_keys(*self.old_tios)
def render(self, size, focus=False):
if not self.terminated:
self.change_focus(focus)
width, height = size
self.touch_term(width, height)
if self.main_loop is None:
self.feed()
return self.term
def add_watch(self):
if self.main_loop is None:
return
self.main_loop.watch_file(self.master, self.feed)
def remove_watch(self):
if self.main_loop is None:
return
self.main_loop.remove_watch_file(self.master)
def selectable(self):
return True
def wait_and_feed(self, timeout=1.0):
while True:
try:
select.select([self.master], [], [], timeout)
break
except select.error as e:
if e.args[0] != 4:
raise
self.feed()
def feed(self):
data = ''
try:
data = os.read(self.master, 4096)
except OSError as e:
if e.errno == 5: # End Of File
data = ''
elif e.errno == errno.EWOULDBLOCK: # empty buffer
return
else:
raise
if data == '': # EOF on BSD
self.terminate()
self._emit('closed')
return
self.term.addstr(data)
self.flush_responses()
def keypress(self, size, key):
if self.terminated:
return key
if key == "window resize":
width, height = size
self.touch_term(width, height)
return
if (self.last_key == self.escape_sequence
and key == self.escape_sequence):
# escape sequence pressed twice...
self.last_key = key
self.keygrab = True
# ... so pass it to the terminal
elif self.keygrab:
if self.escape_sequence == key:
# stop grabbing the terminal
self.keygrab = False
self.last_key = key
return
else:
if key == 'page up':
self.term.scroll_buffer()
self.last_key = key
self._invalidate()
return
elif key == 'page down':
self.term.scroll_buffer(up=False)
self.last_key = key
self._invalidate()
return
elif (self.last_key == self.escape_sequence
and key != self.escape_sequence):
# hand down keypress directly after ungrab.
self.last_key = key
return key
elif self.escape_sequence == key:
# start grabbing the terminal
self.keygrab = True
self.last_key = key
return
elif self._command_map[key] is None or key == 'enter':
# printable character or escape sequence means:
# lock in terminal...
self.keygrab = True
# ... and do key processing
else:
# hand down keypress
self.last_key = key
return key
self.last_key = key
self.term.scroll_buffer(reset=True)
if key.startswith("ctrl "):
if key[-1].islower():
key = chr(ord(key[-1]) - ord('a') + 1)
else:
key = chr(ord(key[-1]) - ord('A') + 1)
else:
if self.term_modes.keys_decckm and key in KEY_TRANSLATIONS_DECCKM:
key = KEY_TRANSLATIONS_DECCKM.get(key)
else:
key = KEY_TRANSLATIONS.get(key, key)
# ENTER transmits both a carriage return and linefeed in LF/NL mode.
if self.term_modes.lfnl and key == "\x0d":
key += "\x0a"
if PYTHON3:
key = key.encode('ascii')
os.write(self.master, key)
Mini Shell