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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) 2008-2011 The IPython Development Team

#

# Distributed under the terms of the BSD License. The full license is in

# the file COPYING, distributed as part of this software.

#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------

# Imports

#-----------------------------------------------------------------------------

import os

import struct

import sys

import warnings

from . import py3compat

#-----------------------------------------------------------------------------

# Code

#-----------------------------------------------------------------------------

# 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 _set_term_title_xterm(title):

""" Change virtual terminal title in xterm-workalikes """

sys.stdout.write('\033]0;%s\007' % title)

if os.name == 'posix':

TERM = os.environ.get('TERM','')

if TERM.startswith('xterm'):

_set_term_title = _set_term_title_xterm

elif sys.platform == 'win32':

try:

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)

except ImportError:

def _set_term_title(title):

"""Set terminal title using the 'title' command."""

global ignore_termtitle

try:

# Cannot be on network share when issuing system commands

curr = py3compat.getcwd()

os.chdir("C:")

ret = os.system("title " + title)

finally:

os.chdir(curr)

if ret:

# non-zero return code signals error, don't try again

ignore_termtitle = True

def set_term_title(title):

"""Set terminal title using the necessary platform-dependent calls."""

if ignore_termtitle:

return

_set_term_title(title)

def freeze_term_title():

warnings.warn("This function is deprecated, use toggle_set_term_title()")

global ignore_termtitle

ignore_termtitle = True

if sys.platform == 'win32':

def get_terminal_size(defaultx=80, defaulty=25):

"""Return size of current terminal console.

This function try to determine actual size of current working

console window and return tuple (sizex, sizey) if success,

or default size (defaultx, defaulty) otherwise.

Dependencies: ctypes should be installed.

Author: Alexander Belchenko (e-mail: bialix AT ukr.net)

"""

try:

import ctypes

except ImportError:

return defaultx, defaulty

h = ctypes.windll.kernel32.GetStdHandle(-11)

csbi = ctypes.create_string_buffer(22)

res = ctypes.windll.kernel32.GetConsoleScreenBufferInfo(h, csbi)

if res:

(bufx, bufy, curx, cury, wattr,

left, top, right, bottom, maxx, maxy) = struct.unpack(

"hhhhHhhhhhh", csbi.raw)

sizex = right - left + 1

sizey = bottom - top + 1

return (sizex, sizey)

else:

return (defaultx, defaulty)

else:

def get_terminal_size(defaultx=80, defaulty=25):

return defaultx, defaulty