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eris/urwid/raw_display.py
Andrew Hamilton 4ee9f57fb6 Include urwid in the src. 
Urwid is only be used for input, not display.
Now adding the minimal set of urwid modules that vigil needs.
These can be further pared down in future.

Thank you to Ian Ward.
2016-12-02 17:01:26 +01:00

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#!/usr/bin/python
#
# Urwid raw display module
# Copyright (C) 2004-2009 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/
"""
Direct terminal UI implementation
"""
import os
import select
import struct
import sys
import signal
import fcntl
import termios
import tty
from urwid import util
from urwid import escape
from urwid.display_common import BaseScreen, RealTerminal, \
UPDATE_PALETTE_ENTRY, AttrSpec, UNPRINTABLE_TRANS_TABLE, \
INPUT_DESCRIPTORS_CHANGED
from urwid import signals
from urwid.compat import PYTHON3, bytes, B
from subprocess import Popen, PIPE
class Screen(BaseScreen, RealTerminal):
def __init__(self, input=sys.stdin, output=sys.stdout):
"""Initialize a screen that directly prints escape codes to an output
terminal.
"""
super(Screen, self).__init__()
self._pal_escape = {}
self._pal_attrspec = {}
signals.connect_signal(self, UPDATE_PALETTE_ENTRY,
self._on_update_palette_entry)
self.colors = 16 # FIXME: detect this
self.has_underline = True # FIXME: detect this
self.register_palette_entry( None, 'default','default')
self._keyqueue = []
self.prev_input_resize = 0
self.set_input_timeouts()
self.screen_buf = None
self._screen_buf_canvas = None
self._resized = False
self.maxrow = None
self.gpm_mev = None
self.gpm_event_pending = False
self._mouse_tracking_enabled = False
self.last_bstate = 0
self._setup_G1_done = False
self._rows_used = None
self._cy = 0
term = os.environ.get('TERM', '')
self.fg_bright_is_bold = not term.startswith("xterm")
self.bg_bright_is_blink = (term == "linux")
self.back_color_erase = not term.startswith("screen")
self._next_timeout = None
# Our connections to the world
self._term_output_file = output
self._term_input_file = input
# pipe for signalling external event loops about resize events
self._resize_pipe_rd, self._resize_pipe_wr = os.pipe()
fcntl.fcntl(self._resize_pipe_rd, fcntl.F_SETFL, os.O_NONBLOCK)
def _on_update_palette_entry(self, name, *attrspecs):
# copy the attribute to a dictionary containing the escape seqences
a = attrspecs[{16:0,1:1,88:2,256:3}[self.colors]]
self._pal_attrspec[name] = a
self._pal_escape[name] = self._attrspec_to_escape(a)
def set_input_timeouts(self, max_wait=None, complete_wait=0.125,
resize_wait=0.125):
"""
Set the get_input timeout values. All values are in floating
point numbers of seconds.
max_wait -- amount of time in seconds to wait for input when
there is no input pending, wait forever if None
complete_wait -- amount of time in seconds to wait when
get_input detects an incomplete escape sequence at the
end of the available input
resize_wait -- amount of time in seconds to wait for more input
after receiving two screen resize requests in a row to
stop Urwid from consuming 100% cpu during a gradual
window resize operation
"""
self.max_wait = max_wait
if max_wait is not None:
if self._next_timeout is None:
self._next_timeout = max_wait
else:
self._next_timeout = min(self._next_timeout, self.max_wait)
self.complete_wait = complete_wait
self.resize_wait = resize_wait
def _sigwinch_handler(self, signum, frame):
if not self._resized:
os.write(self._resize_pipe_wr, B('R'))
self._resized = True
self.screen_buf = None
def _sigcont_handler(self, signum, frame):
self.stop()
self.start()
self._sigwinch_handler(None, None)
def signal_init(self):
"""
Called in the startup of run wrapper to set the SIGWINCH
and SIGCONT signal handlers.
Override this function to call from main thread in threaded
applications.
"""
signal.signal(signal.SIGWINCH, self._sigwinch_handler)
signal.signal(signal.SIGCONT, self._sigcont_handler)
def signal_restore(self):
"""
Called in the finally block of run wrapper to restore the
SIGWINCH and SIGCONT signal handlers.
Override this function to call from main thread in threaded
applications.
"""
signal.signal(signal.SIGCONT, signal.SIG_DFL)
signal.signal(signal.SIGWINCH, signal.SIG_DFL)
def set_mouse_tracking(self, enable=True):
"""
Enable (or disable) mouse tracking.
After calling this function get_input will include mouse
click events along with keystrokes.
"""
enable = bool(enable)
if enable == self._mouse_tracking_enabled:
return
self._mouse_tracking(enable)
self._mouse_tracking_enabled = enable
def _mouse_tracking(self, enable):
if enable:
self.write(escape.MOUSE_TRACKING_ON)
self._start_gpm_tracking()
else:
self.write(escape.MOUSE_TRACKING_OFF)
self._stop_gpm_tracking()
def _start_gpm_tracking(self):
if not os.path.isfile("/usr/bin/mev"):
return
if not os.environ.get('TERM',"").lower().startswith("linux"):
return
if not Popen:
return
m = Popen(["/usr/bin/mev","-e","158"], stdin=PIPE, stdout=PIPE,
close_fds=True)
fcntl.fcntl(m.stdout.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
self.gpm_mev = m
def _stop_gpm_tracking(self):
if not self.gpm_mev:
return
os.kill(self.gpm_mev.pid, signal.SIGINT)
os.waitpid(self.gpm_mev.pid, 0)
self.gpm_mev = None
def _start(self, alternate_buffer=True):
"""
Initialize the screen and input mode.
alternate_buffer -- use alternate screen buffer
"""
if alternate_buffer:
self.write(escape.SWITCH_TO_ALTERNATE_BUFFER)
self._rows_used = None
else:
self._rows_used = 0
fd = self._term_input_file.fileno()
if os.isatty(fd):
self._old_termios_settings = termios.tcgetattr(fd)
tty.setcbreak(fd)
self.signal_init()
self._alternate_buffer = alternate_buffer
self._next_timeout = self.max_wait
if not self._signal_keys_set:
self._old_signal_keys = self.tty_signal_keys(fileno=fd)
signals.emit_signal(self, INPUT_DESCRIPTORS_CHANGED)
# restore mouse tracking to previous state
self._mouse_tracking(self._mouse_tracking_enabled)
return super(Screen, self)._start()
def _stop(self):
"""
Restore the screen.
"""
self.clear()
signals.emit_signal(self, INPUT_DESCRIPTORS_CHANGED)
self.signal_restore()
fd = self._term_input_file.fileno()
if os.isatty(fd):
termios.tcsetattr(fd, termios.TCSADRAIN,
self._old_termios_settings)
self._mouse_tracking(False)
move_cursor = ""
if self._alternate_buffer:
move_cursor = escape.RESTORE_NORMAL_BUFFER
elif self.maxrow is not None:
move_cursor = escape.set_cursor_position(
0, self.maxrow)
self.write(
self._attrspec_to_escape(AttrSpec('',''))
+ escape.SI
+ move_cursor
+ escape.SHOW_CURSOR)
self.flush()
if self._old_signal_keys:
self.tty_signal_keys(*(self._old_signal_keys + (fd,)))
super(Screen, self)._stop()
def write(self, data):
"""Write some data to the terminal.
You may wish to override this if you're using something other than
regular files for input and output.
"""
self._term_output_file.write(data)
def flush(self):
"""Flush the output buffer.
You may wish to override this if you're using something other than
regular files for input and output.
"""
self._term_output_file.flush()
def get_input(self, raw_keys=False):
"""Return pending input as a list.
raw_keys -- return raw keycodes as well as translated versions
This function will immediately return all the input since the
last time it was called. If there is no input pending it will
wait before returning an empty list. The wait time may be
configured with the set_input_timeouts function.
If raw_keys is False (default) this function will return a list
of keys pressed. If raw_keys is True this function will return
a ( keys pressed, raw keycodes ) tuple instead.
Examples of keys returned:
* ASCII printable characters: " ", "a", "0", "A", "-", "/"
* ASCII control characters: "tab", "enter"
* Escape sequences: "up", "page up", "home", "insert", "f1"
* Key combinations: "shift f1", "meta a", "ctrl b"
* Window events: "window resize"
When a narrow encoding is not enabled:
* "Extended ASCII" characters: "\\xa1", "\\xb2", "\\xfe"
When a wide encoding is enabled:
* Double-byte characters: "\\xa1\\xea", "\\xb2\\xd4"
When utf8 encoding is enabled:
* Unicode characters: u"\\u00a5", u'\\u253c"
Examples of mouse events returned:
* Mouse button press: ('mouse press', 1, 15, 13),
('meta mouse press', 2, 17, 23)
* Mouse drag: ('mouse drag', 1, 16, 13),
('mouse drag', 1, 17, 13),
('ctrl mouse drag', 1, 18, 13)
* Mouse button release: ('mouse release', 0, 18, 13),
('ctrl mouse release', 0, 17, 23)
"""
assert self._started
self._wait_for_input_ready(self._next_timeout)
keys, raw = self.parse_input(None, None, self.get_available_raw_input())
# Avoid pegging CPU at 100% when slowly resizing
if keys==['window resize'] and self.prev_input_resize:
while True:
self._wait_for_input_ready(self.resize_wait)
keys, raw2 = self.parse_input(None, None, self.get_available_raw_input())
raw += raw2
#if not keys:
# keys, raw2 = self._get_input(
# self.resize_wait)
# raw += raw2
if keys!=['window resize']:
break
if keys[-1:]!=['window resize']:
keys.append('window resize')
if keys==['window resize']:
self.prev_input_resize = 2
elif self.prev_input_resize == 2 and not keys:
self.prev_input_resize = 1
else:
self.prev_input_resize = 0
if raw_keys:
return keys, raw
return keys
def get_input_descriptors(self):
"""
Return a list of integer file descriptors that should be
polled in external event loops to check for user input.
Use this method if you are implementing your own event loop.
"""
if not self._started:
return []
fd_list = [self._term_input_file.fileno(), self._resize_pipe_rd]
if self.gpm_mev is not None:
fd_list.append(self.gpm_mev.stdout.fileno())
return fd_list
_current_event_loop_handles = ()
def unhook_event_loop(self, event_loop):
"""
Remove any hooks added by hook_event_loop.
"""
for handle in self._current_event_loop_handles:
event_loop.remove_watch_file(handle)
if self._input_timeout:
event_loop.remove_alarm(self._input_timeout)
self._input_timeout = None
def hook_event_loop(self, event_loop, callback):
"""
Register the given callback with the event loop, to be called with new
input whenever it's available. The callback should be passed a list of
processed keys and a list of unprocessed keycodes.
Subclasses may wish to use parse_input to wrap the callback.
"""
if hasattr(self, 'get_input_nonblocking'):
wrapper = self._make_legacy_input_wrapper(event_loop, callback)
else:
wrapper = lambda: self.parse_input(
event_loop, callback, self.get_available_raw_input())
fds = self.get_input_descriptors()
handles = []
for fd in fds:
event_loop.watch_file(fd, wrapper)
self._current_event_loop_handles = handles
_input_timeout = None
_partial_codes = None
def _make_legacy_input_wrapper(self, event_loop, callback):
"""
Support old Screen classes that still have a get_input_nonblocking and
expect it to work.
"""
def wrapper():
if self._input_timeout:
event_loop.remove_alarm(self._input_timeout)
self._input_timeout = None
timeout, keys, raw = self.get_input_nonblocking()
if timeout is not None:
self._input_timeout = event_loop.alarm(timeout, wrapper)
callback(keys, raw)
return wrapper
def get_available_raw_input(self):
"""
Return any currently-available input. Does not block.
This method is only used by the default `hook_event_loop`
implementation; you can safely ignore it if you implement your own.
"""
codes = self._get_gpm_codes() + self._get_keyboard_codes()
if self._partial_codes:
codes = self._partial_codes + codes
self._partial_codes = None
# clean out the pipe used to signal external event loops
# that a resize has occurred
try:
while True: os.read(self._resize_pipe_rd, 1)
except OSError:
pass
return codes
def parse_input(self, event_loop, callback, codes, wait_for_more=True):
"""
Read any available input from get_available_raw_input, parses it into
keys, and calls the given callback.
The current implementation tries to avoid any assumptions about what
the screen or event loop look like; it only deals with parsing keycodes
and setting a timeout when an incomplete one is detected.
`codes` should be a sequence of keycodes, i.e. bytes. A bytearray is
appropriate, but beware of using bytes, which only iterates as integers
on Python 3.
"""
# Note: event_loop may be None for 100% synchronous support, only used
# by get_input. Not documented because you shouldn't be doing it.
if self._input_timeout and event_loop:
event_loop.remove_alarm(self._input_timeout)
self._input_timeout = None
original_codes = codes
processed = []
try:
while codes:
run, codes = escape.process_keyqueue(
codes, wait_for_more)
processed.extend(run)
except escape.MoreInputRequired:
# Set a timer to wait for the rest of the input; if it goes off
# without any new input having come in, use the partial input
k = len(original_codes) - len(codes)
processed_codes = original_codes[:k]
self._partial_codes = codes
def _parse_incomplete_input():
self._input_timeout = None
self._partial_codes = None
self.parse_input(
event_loop, callback, codes, wait_for_more=False)
if event_loop:
self._input_timeout = event_loop.alarm(
self.complete_wait, _parse_incomplete_input)
else:
processed_codes = original_codes
self._partial_codes = None
if self._resized:
processed.append('window resize')
self._resized = False
if callback:
callback(processed, processed_codes)
else:
# For get_input
return processed, processed_codes
def _get_keyboard_codes(self):
codes = []
while True:
code = self._getch_nodelay()
if code < 0:
break
codes.append(code)
return codes
def _get_gpm_codes(self):
codes = []
try:
while self.gpm_mev is not None and self.gpm_event_pending:
codes.extend(self._encode_gpm_event())
except IOError as e:
if e.args[0] != 11:
raise
return codes
def _wait_for_input_ready(self, timeout):
ready = None
fd_list = [self._term_input_file.fileno()]
if self.gpm_mev is not None:
fd_list.append(self.gpm_mev.stdout.fileno())
while True:
try:
if timeout is None:
ready,w,err = select.select(
fd_list, [], fd_list)
else:
ready,w,err = select.select(
fd_list,[],fd_list, timeout)
break
except select.error as e:
if e.args[0] != 4:
raise
if self._resized:
ready = []
break
return ready
def _getch(self, timeout):
ready = self._wait_for_input_ready(timeout)
if self.gpm_mev is not None:
if self.gpm_mev.stdout.fileno() in ready:
self.gpm_event_pending = True
if self._term_input_file.fileno() in ready:
return ord(os.read(self._term_input_file.fileno(), 1))
return -1
def _encode_gpm_event( self ):
self.gpm_event_pending = False
s = self.gpm_mev.stdout.readline().decode('ascii')
l = s.split(",")
if len(l) != 6:
# unexpected output, stop tracking
self._stop_gpm_tracking()
signals.emit_signal(self, INPUT_DESCRIPTORS_CHANGED)
return []
ev, x, y, ign, b, m = s.split(",")
ev = int( ev.split("x")[-1], 16)
x = int( x.split(" ")[-1] )
y = int( y.lstrip().split(" ")[0] )
b = int( b.split(" ")[-1] )
m = int( m.split("x")[-1].rstrip(), 16 )
# convert to xterm-like escape sequence
last = next = self.last_bstate
l = []
mod = 0
if m & 1: mod |= 4 # shift
if m & 10: mod |= 8 # alt
if m & 4: mod |= 16 # ctrl
def append_button( b ):
b |= mod
l.extend([ 27, ord('['), ord('M'), b+32, x+32, y+32 ])
def determine_button_release( flag ):
if b & 4 and last & 1:
append_button( 0 + flag )
next |= 1
if b & 2 and last & 2:
append_button( 1 + flag )
next |= 2
if b & 1 and last & 4:
append_button( 2 + flag )
next |= 4
if ev == 20 or ev == 36 or ev == 52: # press
if b & 4 and last & 1 == 0:
append_button( 0 )
next |= 1
if b & 2 and last & 2 == 0:
append_button( 1 )
next |= 2
if b & 1 and last & 4 == 0:
append_button( 2 )
next |= 4
elif ev == 146: # drag
if b & 4:
append_button( 0 + escape.MOUSE_DRAG_FLAG )
elif b & 2:
append_button( 1 + escape.MOUSE_DRAG_FLAG )
elif b & 1:
append_button( 2 + escape.MOUSE_DRAG_FLAG )
else: # release
if b & 4 and last & 1:
append_button( 0 + escape.MOUSE_RELEASE_FLAG )
next &= ~ 1
if b & 2 and last & 2:
append_button( 1 + escape.MOUSE_RELEASE_FLAG )
next &= ~ 2
if b & 1 and last & 4:
append_button( 2 + escape.MOUSE_RELEASE_FLAG )
next &= ~ 4
if ev == 40: # double click (release)
if b & 4 and last & 1:
append_button( 0 + escape.MOUSE_MULTIPLE_CLICK_FLAG )
if b & 2 and last & 2:
append_button( 1 + escape.MOUSE_MULTIPLE_CLICK_FLAG )
if b & 1 and last & 4:
append_button( 2 + escape.MOUSE_MULTIPLE_CLICK_FLAG )
elif ev == 52:
if b & 4 and last & 1:
append_button( 0 + escape.MOUSE_MULTIPLE_CLICK_FLAG*2 )
if b & 2 and last & 2:
append_button( 1 + escape.MOUSE_MULTIPLE_CLICK_FLAG*2 )
if b & 1 and last & 4:
append_button( 2 + escape.MOUSE_MULTIPLE_CLICK_FLAG*2 )
self.last_bstate = next
return l
def _getch_nodelay(self):
return self._getch(0)
def get_cols_rows(self):
"""Return the terminal dimensions (num columns, num rows)."""
y, x = 80, 24
try:
buf = fcntl.ioctl(self._term_output_file.fileno(),
termios.TIOCGWINSZ, ' '*4)
y, x = struct.unpack('hh', buf)
except IOError:
# Term size could not be determined
pass
self.maxrow = y
return x, y
def _setup_G1(self):
"""
Initialize the G1 character set to graphics mode if required.
"""
if self._setup_G1_done:
return
while True:
try:
self.write(escape.DESIGNATE_G1_SPECIAL)
self.flush()
break
except IOError:
pass
self._setup_G1_done = True
def draw_screen(self, xxx_todo_changeme, r ):
"""Paint screen with rendered canvas."""
(maxcol, maxrow) = xxx_todo_changeme
assert self._started
assert maxrow == r.rows()
# quick return if nothing has changed
if self.screen_buf and r is self._screen_buf_canvas:
return
self._setup_G1()
if self._resized:
# handle resize before trying to draw screen
return
o = [escape.HIDE_CURSOR, self._attrspec_to_escape(AttrSpec('',''))]
def partial_display():
# returns True if the screen is in partial display mode
# ie. only some rows belong to the display
return self._rows_used is not None
if not partial_display():
o.append(escape.CURSOR_HOME)
if self.screen_buf:
osb = self.screen_buf
else:
osb = []
sb = []
cy = self._cy
y = -1
def set_cursor_home():
if not partial_display():
return escape.set_cursor_position(0, 0)
return (escape.CURSOR_HOME_COL +
escape.move_cursor_up(cy))
def set_cursor_row(y):
if not partial_display():
return escape.set_cursor_position(0, y)
return escape.move_cursor_down(y - cy)
def set_cursor_position(x, y):
if not partial_display():
return escape.set_cursor_position(x, y)
if cy > y:
return ('\b' + escape.CURSOR_HOME_COL +
escape.move_cursor_up(cy - y) +
escape.move_cursor_right(x))
return ('\b' + escape.CURSOR_HOME_COL +
escape.move_cursor_down(y - cy) +
escape.move_cursor_right(x))
def is_blank_row(row):
if len(row) > 1:
return False
if row[0][2].strip():
return False
return True
def attr_to_escape(a):
if a in self._pal_escape:
return self._pal_escape[a]
elif isinstance(a, AttrSpec):
return self._attrspec_to_escape(a)
# undefined attributes use default/default
# TODO: track and report these
return self._attrspec_to_escape(
AttrSpec('default','default'))
def using_standout(a):
a = self._pal_attrspec.get(a, a)
return isinstance(a, AttrSpec) and a.standout
ins = None
o.append(set_cursor_home())
cy = 0
for row in r.content():
y += 1
if osb and y < len(osb) and osb[y] == row:
# this row of the screen buffer matches what is
# currently displayed, so we can skip this line
sb.append( osb[y] )
continue
sb.append(row)
# leave blank lines off display when we are using
# the default screen buffer (allows partial screen)
if partial_display() and y > self._rows_used:
if is_blank_row(row):
continue
self._rows_used = y
if y or partial_display():
o.append(set_cursor_position(0, y))
# after updating the line we will be just over the
# edge, but terminals still treat this as being
# on the same line
cy = y
whitespace_at_end = False
if row:
a, cs, run = row[-1]
if (run[-1:] == B(' ') and self.back_color_erase
and not using_standout(a)):
whitespace_at_end = True
row = row[:-1] + [(a, cs, run.rstrip(B(' ')))]
elif y == maxrow-1 and maxcol > 1:
row, back, ins = self._last_row(row)
first = True
lasta = lastcs = None
for (a,cs, run) in row:
assert isinstance(run, bytes) # canvases should render with bytes
if cs != 'U':
run = run.translate(UNPRINTABLE_TRANS_TABLE)
if first or lasta != a:
o.append(attr_to_escape(a))
lasta = a
if first or lastcs != cs:
assert cs in [None, "0", "U"], repr(cs)
if lastcs == "U":
o.append( escape.IBMPC_OFF )
if cs is None:
o.append( escape.SI )
elif cs == "U":
o.append( escape.IBMPC_ON )
else:
o.append( escape.SO )
lastcs = cs
o.append( run )
first = False
if ins:
(inserta, insertcs, inserttext) = ins
ias = attr_to_escape(inserta)
assert insertcs in [None, "0", "U"], repr(insertcs)
if cs is None:
icss = escape.SI
elif cs == "U":
icss = escape.IBMPC_ON
else:
icss = escape.SO
o += [ "\x08"*back,
ias, icss,
escape.INSERT_ON, inserttext,
escape.INSERT_OFF ]
if cs == "U":
o.append(escape.IBMPC_OFF)
if whitespace_at_end:
o.append(escape.ERASE_IN_LINE_RIGHT)
if r.cursor is not None:
x,y = r.cursor
o += [set_cursor_position(x, y),
escape.SHOW_CURSOR ]
self._cy = y
if self._resized:
# handle resize before trying to draw screen
return
try:
for l in o:
if isinstance(l, bytes) and PYTHON3:
l = l.decode('utf-8')
self.write(l)
self.flush()
except IOError as e:
# ignore interrupted syscall
if e.args[0] != 4:
raise
self.screen_buf = sb
self._screen_buf_canvas = r
def _last_row(self, row):
"""On the last row we need to slide the bottom right character
into place. Calculate the new line, attr and an insert sequence
to do that.
eg. last row:
XXXXXXXXXXXXXXXXXXXXYZ
Y will be drawn after Z, shifting Z into position.
"""
new_row = row[:-1]
z_attr, z_cs, last_text = row[-1]
last_cols = util.calc_width(last_text, 0, len(last_text))
last_offs, z_col = util.calc_text_pos(last_text, 0,
len(last_text), last_cols-1)
if last_offs == 0:
z_text = last_text
del new_row[-1]
# we need another segment
y_attr, y_cs, nlast_text = row[-2]
nlast_cols = util.calc_width(nlast_text, 0,
len(nlast_text))
z_col += nlast_cols
nlast_offs, y_col = util.calc_text_pos(nlast_text, 0,
len(nlast_text), nlast_cols-1)
y_text = nlast_text[nlast_offs:]
if nlast_offs:
new_row.append((y_attr, y_cs,
nlast_text[:nlast_offs]))
else:
z_text = last_text[last_offs:]
y_attr, y_cs = z_attr, z_cs
nlast_cols = util.calc_width(last_text, 0,
last_offs)
nlast_offs, y_col = util.calc_text_pos(last_text, 0,
last_offs, nlast_cols-1)
y_text = last_text[nlast_offs:last_offs]
if nlast_offs:
new_row.append((y_attr, y_cs,
last_text[:nlast_offs]))
new_row.append((z_attr, z_cs, z_text))
return new_row, z_col-y_col, (y_attr, y_cs, y_text)
def clear(self):
"""
Force the screen to be completely repainted on the next
call to draw_screen().
"""
self.screen_buf = None
self.setup_G1 = True
def _attrspec_to_escape(self, a):
"""
Convert AttrSpec instance a to an escape sequence for the terminal
>>> s = Screen()
>>> s.set_terminal_properties(colors=256)
>>> a2e = s._attrspec_to_escape
>>> a2e(s.AttrSpec('brown', 'dark green'))
'\\x1b[0;33;42m'
>>> a2e(s.AttrSpec('#fea,underline', '#d0d'))
'\\x1b[0;38;5;229;4;48;5;164m'
"""
if a.foreground_high:
fg = "38;5;%d" % a.foreground_number
elif a.foreground_basic:
if a.foreground_number > 7:
if self.fg_bright_is_bold:
fg = "1;%d" % (a.foreground_number - 8 + 30)
else:
fg = "%d" % (a.foreground_number - 8 + 90)
else:
fg = "%d" % (a.foreground_number + 30)
else:
fg = "39"
st = ("1;" * a.bold + "4;" * a.underline +
"5;" * a.blink + "7;" * a.standout)
if a.background_high:
bg = "48;5;%d" % a.background_number
elif a.background_basic:
if a.background_number > 7:
if self.bg_bright_is_blink:
bg = "5;%d" % (a.background_number - 8 + 40)
else:
# this doesn't work on most terminals
bg = "%d" % (a.background_number - 8 + 100)
else:
bg = "%d" % (a.background_number + 40)
else:
bg = "49"
return escape.ESC + "[0;%s;%s%sm" % (fg, st, bg)
def set_terminal_properties(self, colors=None, bright_is_bold=None,
has_underline=None):
"""
colors -- number of colors terminal supports (1, 16, 88 or 256)
or None to leave unchanged
bright_is_bold -- set to True if this terminal uses the bold
setting to create bright colors (numbers 8-15), set to False
if this Terminal can create bright colors without bold or
None to leave unchanged
has_underline -- set to True if this terminal can use the
underline setting, False if it cannot or None to leave
unchanged
"""
if colors is None:
colors = self.colors
if bright_is_bold is None:
bright_is_bold = self.fg_bright_is_bold
if has_underline is None:
has_underline = self.has_underline
if colors == self.colors and bright_is_bold == self.fg_bright_is_bold \
and has_underline == self.has_underline:
return
self.colors = colors
self.fg_bright_is_bold = bright_is_bold
self.has_underline = has_underline
self.clear()
self._pal_escape = {}
for p,v in list(self._palette.items()):
self._on_update_palette_entry(p, *v)
def reset_default_terminal_palette(self):
"""
Attempt to set the terminal palette to default values as taken
from xterm. Uses number of colors from current
set_terminal_properties() screen setting.
"""
if self.colors == 1:
return
def rgb_values(n):
if self.colors == 16:
aspec = AttrSpec("h%d"%n, "", 256)
else:
aspec = AttrSpec("h%d"%n, "", self.colors)
return aspec.get_rgb_values()[:3]
entries = [(n,) + rgb_values(n) for n in range(self.colors)]
self.modify_terminal_palette(entries)
def modify_terminal_palette(self, entries):
"""
entries - list of (index, red, green, blue) tuples.
Attempt to set part of the terminal palette (this does not work
on all terminals.) The changes are sent as a single escape
sequence so they should all take effect at the same time.
0 <= index < 256 (some terminals will only have 16 or 88 colors)
0 <= red, green, blue < 256
"""
modify = ["%d;rgb:%02x/%02x/%02x" % (index, red, green, blue)
for index, red, green, blue in entries]
self.write("\x1b]4;"+";".join(modify)+"\x1b\\")
self.flush()
# shortcut for creating an AttrSpec with this screen object's
# number of colors
AttrSpec = lambda self, fg, bg: AttrSpec(fg, bg, self.colors)
def _test():
import doctest
doctest.testmod()
if __name__=='__main__':
_test()
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