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# encoding: utf-8
"""
Utilities for working with terminals.
Authors:
* Brian E. Granger
* Fernando Perez
* Alexander Belchenko (e-mail: bialix AT ukr.net)
"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
import os
import sys
import warnings
from shutil import get_terminal_size as _get_terminal_size
# This variable is part of the expected API of the module:
ignore_termtitle = True
if os.name == 'posix':
def _term_clear():
os.system('clear')
elif sys.platform == 'win32':
def _term_clear():
os.system('cls')
else:
def _term_clear():
pass
def toggle_set_term_title(val):
"""Control whether set_term_title is active or not.
set_term_title() allows writing to the console titlebar. In embedded
widgets this can cause problems, so this call can be used to toggle it on
or off as needed.
The default state of the module is for the function to be disabled.
Parameters
----------
val : bool
If True, set_term_title() actually writes to the terminal (using the
appropriate platform-specific module). If False, it is a no-op.
"""
global ignore_termtitle
ignore_termtitle = not(val)
def _set_term_title(*args,**kw):
"""Dummy no-op."""
pass
def _restore_term_title():
pass
_xterm_term_title_saved = False
def _set_term_title_xterm(title):
""" Change virtual terminal title in xterm-workalikes """
global _xterm_term_title_saved
# Only save the title the first time we set, otherwise restore will only
# go back one title (probably undoing a %cd title change).
if not _xterm_term_title_saved:
# save the current title to the xterm "stack"
sys.stdout.write("\033[22;0t")
_xterm_term_title_saved = True
sys.stdout.write('\033]0;%s\007' % title)
def _restore_term_title_xterm():
# Make sure the restore has at least one accompanying set.
global _xterm_term_title_saved
if not _xterm_term_title_saved:
warnings.warn(
"Expecting xterm_term_title_saved to be True, but is not; will not restore terminal title.",
stacklevel=1,
)
return
sys.stdout.write('\033[23;0t')
_xterm_term_title_saved = False
if os.name == 'posix':
TERM = os.environ.get('TERM','')
if TERM.startswith('xterm'):
_set_term_title = _set_term_title_xterm
_restore_term_title = _restore_term_title_xterm
elif sys.platform == 'win32':
import ctypes
SetConsoleTitleW = ctypes.windll.kernel32.SetConsoleTitleW
SetConsoleTitleW.argtypes = [ctypes.c_wchar_p]
def _set_term_title(title):
"""Set terminal title using ctypes to access the Win32 APIs."""
SetConsoleTitleW(title)
def set_term_title(title):
"""Set terminal title using the necessary platform-dependent calls."""
if ignore_termtitle:
return
_set_term_title(title)
def restore_term_title():
"""Restore, if possible, terminal title to the original state"""
if ignore_termtitle:
return
_restore_term_title()
def freeze_term_title():
warnings.warn("This function is deprecated, use toggle_set_term_title()")
global ignore_termtitle
ignore_termtitle = True
def get_terminal_size(defaultx=80, defaulty=25):
return _get_terminal_size((defaultx, defaulty))
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