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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 | |
| assert _xterm_term_title_saved | |
| 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)) | |