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Filename :
winterm.py
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# Copyright Jonathan Hartley 2013. BSD 3-Clause license, see LICENSE file. try: from msvcrt import get_osfhandle except ImportError: def get_osfhandle(_): raise OSError("This isn't windows!") from . import win32 # from wincon.h class WinColor(object): BLACK = 0 BLUE = 1 GREEN = 2 CYAN = 3 RED = 4 MAGENTA = 5 YELLOW = 6 GREY = 7 # from wincon.h class WinStyle(object): NORMAL = 0x00 # dim text, dim background BRIGHT = 0x08 # bright text, dim background BRIGHT_BACKGROUND = 0x80 # dim text, bright background class WinTerm(object): def __init__(self): self._default = win32.GetConsoleScreenBufferInfo(win32.STDOUT).wAttributes self.set_attrs(self._default) self._default_fore = self._fore self._default_back = self._back self._default_style = self._style # In order to emulate LIGHT_EX in windows, we borrow the BRIGHT style. # So that LIGHT_EX colors and BRIGHT style do not clobber each other, # we track them separately, since LIGHT_EX is overwritten by Fore/Back # and BRIGHT is overwritten by Style codes. self._light = 0 def get_attrs(self): return self._fore + self._back * 16 + (self._style | self._light) def set_attrs(self, value): self._fore = value & 7 self._back = (value >> 4) & 7 self._style = value & (WinStyle.BRIGHT | WinStyle.BRIGHT_BACKGROUND) def reset_all(self, on_stderr=None): self.set_attrs(self._default) self.set_console(attrs=self._default) self._light = 0 def fore(self, fore=None, light=False, on_stderr=False): if fore is None: fore = self._default_fore self._fore = fore # Emulate LIGHT_EX with BRIGHT Style if light: self._light |= WinStyle.BRIGHT else: self._light &= ~WinStyle.BRIGHT self.set_console(on_stderr=on_stderr) def back(self, back=None, light=False, on_stderr=False): if back is None: back = self._default_back self._back = back # Emulate LIGHT_EX with BRIGHT_BACKGROUND Style if light: self._light |= WinStyle.BRIGHT_BACKGROUND else: self._light &= ~WinStyle.BRIGHT_BACKGROUND self.set_console(on_stderr=on_stderr) def style(self, style=None, on_stderr=False): if style is None: style = self._default_style self._style = style self.set_console(on_stderr=on_stderr) def set_console(self, attrs=None, on_stderr=False): if attrs is None: attrs = self.get_attrs() handle = win32.STDOUT if on_stderr: handle = win32.STDERR win32.SetConsoleTextAttribute(handle, attrs) def get_position(self, handle): position = win32.GetConsoleScreenBufferInfo(handle).dwCursorPosition # Because Windows coordinates are 0-based, # and win32.SetConsoleCursorPosition expects 1-based. position.X += 1 position.Y += 1 return position def set_cursor_position(self, position=None, on_stderr=False): if position is None: # I'm not currently tracking the position, so there is no default. # position = self.get_position() return handle = win32.STDOUT if on_stderr: handle = win32.STDERR win32.SetConsoleCursorPosition(handle, position) def cursor_adjust(self, x, y, on_stderr=False): handle = win32.STDOUT if on_stderr: handle = win32.STDERR position = self.get_position(handle) adjusted_position = (position.Y + y, position.X + x) win32.SetConsoleCursorPosition(handle, adjusted_position, adjust=False) def erase_screen(self, mode=0, on_stderr=False): # 0 should clear from the cursor to the end of the screen. # 1 should clear from the cursor to the beginning of the screen. # 2 should clear the entire screen, and move cursor to (1,1) handle = win32.STDOUT if on_stderr: handle = win32.STDERR csbi = win32.GetConsoleScreenBufferInfo(handle) # get the number of character cells in the current buffer cells_in_screen = csbi.dwSize.X * csbi.dwSize.Y # get number of character cells before current cursor position cells_before_cursor = csbi.dwSize.X * csbi.dwCursorPosition.Y + csbi.dwCursorPosition.X if mode == 0: from_coord = csbi.dwCursorPosition cells_to_erase = cells_in_screen - cells_before_cursor elif mode == 1: from_coord = win32.COORD(0, 0) cells_to_erase = cells_before_cursor elif mode == 2: from_coord = win32.COORD(0, 0) cells_to_erase = cells_in_screen else: # invalid mode return # fill the entire screen with blanks win32.FillConsoleOutputCharacter(handle, ' ', cells_to_erase, from_coord) # now set the buffer's attributes accordingly win32.FillConsoleOutputAttribute(handle, self.get_attrs(), cells_to_erase, from_coord) if mode == 2: # put the cursor where needed win32.SetConsoleCursorPosition(handle, (1, 1)) def erase_line(self, mode=0, on_stderr=False): # 0 should clear from the cursor to the end of the line. # 1 should clear from the cursor to the beginning of the line. # 2 should clear the entire line. handle = win32.STDOUT if on_stderr: handle = win32.STDERR csbi = win32.GetConsoleScreenBufferInfo(handle) if mode == 0: from_coord = csbi.dwCursorPosition cells_to_erase = csbi.dwSize.X - csbi.dwCursorPosition.X elif mode == 1: from_coord = win32.COORD(0, csbi.dwCursorPosition.Y) cells_to_erase = csbi.dwCursorPosition.X elif mode == 2: from_coord = win32.COORD(0, csbi.dwCursorPosition.Y) cells_to_erase = csbi.dwSize.X else: # invalid mode return # fill the entire screen with blanks win32.FillConsoleOutputCharacter(handle, ' ', cells_to_erase, from_coord) # now set the buffer's attributes accordingly win32.FillConsoleOutputAttribute(handle, self.get_attrs(), cells_to_erase, from_coord) def set_title(self, title): win32.SetConsoleTitle(title) def enable_vt_processing(fd): if win32.windll is None or not win32.winapi_test(): return False try: handle = get_osfhandle(fd) mode = win32.GetConsoleMode(handle) win32.SetConsoleMode( handle, mode | win32.ENABLE_VIRTUAL_TERMINAL_PROCESSING, ) mode = win32.GetConsoleMode(handle) if mode & win32.ENABLE_VIRTUAL_TERMINAL_PROCESSING: return True # Can get TypeError in testsuite where 'fd' is a Mock() except (OSError, TypeError): return False