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#!/usr/bin/python # Urwid common display code # Copyright (C) 2004-2011 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/ from __future__ import division, print_function import os import sys try: import termios except ImportError: pass # windows from urwid.util import StoppingContext, int_scale from urwid import signals from urwid.compat import B, bytes3, xrange, with_metaclass # for replacing unprintable bytes with '?' UNPRINTABLE_TRANS_TABLE = B("?") * 32 + bytes3(list(xrange(32,256))) # signals sent by BaseScreen UPDATE_PALETTE_ENTRY = "update palette entry" INPUT_DESCRIPTORS_CHANGED = "input descriptors changed" # AttrSpec internal values _BASIC_START = 0 # first index of basic color aliases _CUBE_START = 16 # first index of color cube _CUBE_SIZE_256 = 6 # one side of the color cube _GRAY_SIZE_256 = 24 _GRAY_START_256 = _CUBE_SIZE_256 3 + _CUBE_START _CUBE_WHITE_256 = _GRAY_START_256 -1 _CUBE_SIZE_88 = 4 _GRAY_SIZE_88 = 8 _GRAY_START_88 = _CUBE_SIZE_88 3 + _CUBE_START _CUBE_WHITE_88 = _GRAY_START_88 -1 _CUBE_BLACK = _CUBE_START # values copied from xterm 256colres.h: _CUBE_STEPS_256 = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff] _GRAY_STEPS_256 = [0x08, 0x12, 0x1c, 0x26, 0x30, 0x3a, 0x44, 0x4e, 0x58, 0x62, 0x6c, 0x76, 0x80, 0x84, 0x94, 0x9e, 0xa8, 0xb2, 0xbc, 0xc6, 0xd0, 0xda, 0xe4, 0xee] # values copied from xterm 88colres.h: _CUBE_STEPS_88 = [0x00, 0x8b, 0xcd, 0xff] _GRAY_STEPS_88 = [0x2e, 0x5c, 0x73, 0x8b, 0xa2, 0xb9, 0xd0, 0xe7] # values copied from X11/rgb.txt and XTerm-col.ad: _BASIC_COLOR_VALUES = [(0,0,0), (205, 0, 0), (0, 205, 0), (205, 205, 0), (0, 0, 238), (205, 0, 205), (0, 205, 205), (229, 229, 229), (127, 127, 127), (255, 0, 0), (0, 255, 0), (255, 255, 0), (0x5c, 0x5c, 0xff), (255, 0, 255), (0, 255, 255), (255, 255, 255)] _COLOR_VALUES_256 = (_BASIC_COLOR_VALUES + [(r, g, b) for r in _CUBE_STEPS_256 for g in _CUBE_STEPS_256 for b in _CUBE_STEPS_256] + [(gr, gr, gr) for gr in _GRAY_STEPS_256]) _COLOR_VALUES_88 = (_BASIC_COLOR_VALUES + [(r, g, b) for r in _CUBE_STEPS_88 for g in _CUBE_STEPS_88 for b in _CUBE_STEPS_88] + [(gr, gr, gr) for gr in _GRAY_STEPS_88]) assert len(_COLOR_VALUES_256) == 256 assert len(_COLOR_VALUES_88) == 88 _FG_COLOR_MASK = 0x000000ff _BG_COLOR_MASK = 0x0000ff00 _FG_BASIC_COLOR = 0x00010000 _FG_HIGH_COLOR = 0x00020000 _BG_BASIC_COLOR = 0x00040000 _BG_HIGH_COLOR = 0x00080000 _BG_SHIFT = 8 _HIGH_88_COLOR = 0x00100000 _STANDOUT = 0x02000000 _UNDERLINE = 0x04000000 _BOLD = 0x08000000 _BLINK = 0x10000000 _ITALICS = 0x20000000 _STRIKETHROUGH = 0x40000000 _FG_MASK = (_FG_COLOR_MASK \| _FG_BASIC_COLOR \| _FG_HIGH_COLOR \| _STANDOUT \| _UNDERLINE \| _BLINK \| _BOLD \| _ITALICS \| _STRIKETHROUGH) _BG_MASK = _BG_COLOR_MASK \| _BG_BASIC_COLOR \| _BG_HIGH_COLOR DEFAULT = 'default' BLACK = 'black' DARK_RED = 'dark red' DARK_GREEN = 'dark green' BROWN = 'brown' DARK_BLUE = 'dark blue' DARK_MAGENTA = 'dark magenta' DARK_CYAN = 'dark cyan' LIGHT_GRAY = 'light gray' DARK_GRAY = 'dark gray' LIGHT_RED = 'light red' LIGHT_GREEN = 'light green' YELLOW = 'yellow' LIGHT_BLUE = 'light blue' LIGHT_MAGENTA = 'light magenta' LIGHT_CYAN = 'light cyan' WHITE = 'white' _BASIC_COLORS = [ BLACK, DARK_RED, DARK_GREEN, BROWN, DARK_BLUE, DARK_MAGENTA, DARK_CYAN, LIGHT_GRAY, DARK_GRAY, LIGHT_RED, LIGHT_GREEN, YELLOW, LIGHT_BLUE, LIGHT_MAGENTA, LIGHT_CYAN, WHITE, ] _ATTRIBUTES = { 'bold': _BOLD, 'italics': _ITALICS, 'underline': _UNDERLINE, 'blink': _BLINK, 'standout': _STANDOUT, 'strikethrough': _STRIKETHROUGH, } def _value_lookup_table(values, size): """ Generate a lookup table for finding the closest item in values. Lookup returns (index into values)+1 values -- list of values in ascending order, all < size size -- size of lookup table and maximum value >>> _value_lookup_table([0, 7, 9], 10) [0, 0, 0, 0, 1, 1, 1, 1, 2, 2] """ middle_values = [0] + [(values[i] + values[i + 1] + 1) // 2 for i in range(len(values) - 1)] + [size] lookup_table = [] for i in range(len(middle_values)-1): count = middle_values[i + 1] - middle_values[i] lookup_table.extend([i] * count) return lookup_table _CUBE_256_LOOKUP = _value_lookup_table(_CUBE_STEPS_256, 256) _GRAY_256_LOOKUP = _value_lookup_table([0] + _GRAY_STEPS_256 + [0xff], 256) _CUBE_88_LOOKUP = _value_lookup_table(_CUBE_STEPS_88, 256) _GRAY_88_LOOKUP = _value_lookup_table([0] + _GRAY_STEPS_88 + [0xff], 256) # convert steps to values that will be used by string versions of the colors # 1 hex digit for rgb and 0..100 for grayscale _CUBE_STEPS_256_16 = [int_scale(n, 0x100, 0x10) for n in _CUBE_STEPS_256] _GRAY_STEPS_256_101 = [int_scale(n, 0x100, 101) for n in _GRAY_STEPS_256] _CUBE_STEPS_88_16 = [int_scale(n, 0x100, 0x10) for n in _CUBE_STEPS_88] _GRAY_STEPS_88_101 = [int_scale(n, 0x100, 101) for n in _GRAY_STEPS_88] # create lookup tables for 1 hex digit rgb and 0..100 for grayscale values _CUBE_256_LOOKUP_16 = [_CUBE_256_LOOKUP[int_scale(n, 16, 0x100)] for n in range(16)] _GRAY_256_LOOKUP_101 = [_GRAY_256_LOOKUP[int_scale(n, 101, 0x100)] for n in range(101)] _CUBE_88_LOOKUP_16 = [_CUBE_88_LOOKUP[int_scale(n, 16, 0x100)] for n in range(16)] _GRAY_88_LOOKUP_101 = [_GRAY_88_LOOKUP[int_scale(n, 101, 0x100)] for n in range(101)] # The functions _gray_num_256() and _gray_num_88() do not include the gray # values from the color cube so that the gray steps are an even width. # The color cube grays are available by using the rgb functions. Pure # white and black are taken from the color cube, since the gray range does # not include them, and the basic colors are more likely to have been # customized by an end-user. def _gray_num_256(gnum): """Return ths color number for gray number gnum. Color cube black and white are returned for 0 and 25 respectively since those values aren't included in the gray scale. """ # grays start from index 1 gnum -= 1 if gnum < 0: return _CUBE_BLACK if gnum >= _GRAY_SIZE_256: return _CUBE_WHITE_256 return _GRAY_START_256 + gnum def _gray_num_88(gnum): """Return ths color number for gray number gnum. Color cube black and white are returned for 0 and 9 respectively since those values aren't included in the gray scale. """ # gnums start from index 1 gnum -= 1 if gnum < 0: return _CUBE_BLACK if gnum >= _GRAY_SIZE_88: return _CUBE_WHITE_88 return _GRAY_START_88 + gnum def _color_desc_256(num): """ Return a string description of color number num. 0..15 -> 'h0'..'h15' basic colors (as high-colors) 16..231 -> '#000'..'#fff' color cube colors 232..255 -> 'g3'..'g93' grays >>> _color_desc_256(15) 'h15' >>> _color_desc_256(16) '#000' >>> _color_desc_256(17) '#006' >>> _color_desc_256(230) '#ffd' >>> _color_desc_256(233) 'g7' >>> _color_desc_256(234) 'g11' """ assert num >= 0 and num < 256, num if num < _CUBE_START: return 'h%d' % num if num < _GRAY_START_256: num -= _CUBE_START b, num = num % _CUBE_SIZE_256, num // _CUBE_SIZE_256 g, num = num % _CUBE_SIZE_256, num // _CUBE_SIZE_256 r = num % _CUBE_SIZE_256 return '#%x%x%x' % (_CUBE_STEPS_256_16[r], _CUBE_STEPS_256_16[g], _CUBE_STEPS_256_16[b]) return 'g%d' % _GRAY_STEPS_256_101[num - _GRAY_START_256] def _color_desc_88(num): """ Return a string description of color number num. 0..15 -> 'h0'..'h15' basic colors (as high-colors) 16..79 -> '#000'..'#fff' color cube colors 80..87 -> 'g18'..'g90' grays >>> _color_desc_88(15) 'h15' >>> _color_desc_88(16) '#000' >>> _color_desc_88(17) '#008' >>> _color_desc_88(78) '#ffc' >>> _color_desc_88(81) 'g36' >>> _color_desc_88(82) 'g45' """ assert num > 0 and num < 88 if num < _CUBE_START: return 'h%d' % num if num < _GRAY_START_88: num -= _CUBE_START b, num = num % _CUBE_SIZE_88, num // _CUBE_SIZE_88 g, r= num % _CUBE_SIZE_88, num // _CUBE_SIZE_88 return '#%x%x%x' % (_CUBE_STEPS_88_16[r], _CUBE_STEPS_88_16[g], _CUBE_STEPS_88_16[b]) return 'g%d' % _GRAY_STEPS_88_101[num - _GRAY_START_88] def _parse_color_256(desc): """ Return a color number for the description desc. 'h0'..'h255' -> 0..255 actual color number '#000'..'#fff' -> 16..231 color cube colors 'g0'..'g100' -> 16, 232..255, 231 grays and color cube black/white 'g#00'..'g#ff' -> 16, 232...255, 231 gray and color cube black/white Returns None if desc is invalid. >>> _parse_color_256('h142') 142 >>> _parse_color_256('#f00') 196 >>> _parse_color_256('g100') 231 >>> _parse_color_256('g#80') 244 """ if len(desc) > 4: # keep the length within reason before parsing return None try: if desc.startswith('h'): # high-color number num = int(desc[1:], 10) if num < 0 or num > 255: return None return num if desc.startswith('#') and len(desc) == 4: # color-cube coordinates rgb = int(desc[1:], 16) if rgb < 0: return None b, rgb = rgb % 16, rgb // 16 g, r = rgb % 16, rgb // 16 # find the closest rgb values r = _CUBE_256_LOOKUP_16[r] g = _CUBE_256_LOOKUP_16[g] b = _CUBE_256_LOOKUP_16[b] return _CUBE_START + (r * _CUBE_SIZE_256 + g) * _CUBE_SIZE_256 + b # Only remaining possibility is gray value if desc.startswith('g#'): # hex value 00..ff gray = int(desc[2:], 16) if gray < 0 or gray > 255: return None gray = _GRAY_256_LOOKUP[gray] elif desc.startswith('g'): # decimal value 0..100 gray = int(desc[1:], 10) if gray < 0 or gray > 100: return None gray = _GRAY_256_LOOKUP_101[gray] else: return None if gray == 0: return _CUBE_BLACK gray -= 1 if gray == _GRAY_SIZE_256: return _CUBE_WHITE_256 return _GRAY_START_256 + gray except ValueError: return None def _parse_color_88(desc): """ Return a color number for the description desc. 'h0'..'h87' -> 0..87 actual color number '#000'..'#fff' -> 16..79 color cube colors 'g0'..'g100' -> 16, 80..87, 79 grays and color cube black/white 'g#00'..'g#ff' -> 16, 80...87, 79 gray and color cube black/white Returns None if desc is invalid. >>> _parse_color_88('h142') >>> _parse_color_88('h42') 42 >>> _parse_color_88('#f00') 64 >>> _parse_color_88('g100') 79 >>> _parse_color_88('g#80') 83 """ if len(desc) > 4: # keep the length within reason before parsing return None try: if desc.startswith('h'): # high-color number num = int(desc[1:], 10) if num < 0 or num > 87: return None return num if desc.startswith('#') and len(desc) == 4: # color-cube coordinates rgb = int(desc[1:], 16) if rgb < 0: return None b, rgb = rgb % 16, rgb // 16 g, r = rgb % 16, rgb // 16 # find the closest rgb values r = _CUBE_88_LOOKUP_16[r] g = _CUBE_88_LOOKUP_16[g] b = _CUBE_88_LOOKUP_16[b] return _CUBE_START + (r * _CUBE_SIZE_88 + g) * _CUBE_SIZE_88 + b # Only remaining possibility is gray value if desc.startswith('g#'): # hex value 00..ff gray = int(desc[2:], 16) if gray < 0 or gray > 255: return None gray = _GRAY_88_LOOKUP[gray] elif desc.startswith('g'): # decimal value 0..100 gray = int(desc[1:], 10) if gray < 0 or gray > 100: return None gray = _GRAY_88_LOOKUP_101[gray] else: return None if gray == 0: return _CUBE_BLACK gray -= 1 if gray == _GRAY_SIZE_88: return _CUBE_WHITE_88 return _GRAY_START_88 + gray except ValueError: return None class AttrSpecError(Exception): pass class AttrSpec(object): def __init__(self, fg, bg, colors=256): """ fg -- a string containing a comma-separated foreground color and settings Color values: 'default' (use the terminal's default foreground), 'black', 'dark red', 'dark green', 'brown', 'dark blue', 'dark magenta', 'dark cyan', 'light gray', 'dark gray', 'light red', 'light green', 'yellow', 'light blue', 'light magenta', 'light cyan', 'white' High-color example values: '#009' (0% red, 0% green, 60% red, like HTML colors) '#fcc' (100% red, 80% green, 80% blue) 'g40' (40% gray, decimal), 'g#cc' (80% gray, hex), '#000', 'g0', 'g#00' (black), '#fff', 'g100', 'g#ff' (white) 'h8' (color number 8), 'h255' (color number 255) Setting: 'bold', 'italics', 'underline', 'blink', 'standout', 'strikethrough' Some terminals use 'bold' for bright colors. Most terminals ignore the 'blink' setting. If the color is not given then 'default' will be assumed. bg -- a string containing the background color Color values: 'default' (use the terminal's default background), 'black', 'dark red', 'dark green', 'brown', 'dark blue', 'dark magenta', 'dark cyan', 'light gray' High-color exaples: see fg examples above An empty string will be treated the same as 'default'. colors -- the maximum colors available for the specification Valid values include: 1, 16, 88 and 256. High-color values are only usable with 88 or 256 colors. With 1 color only the foreground settings may be used. >>> AttrSpec('dark red', 'light gray', 16) AttrSpec('dark red', 'light gray') >>> AttrSpec('yellow, underline, bold', 'dark blue') AttrSpec('yellow,bold,underline', 'dark blue') >>> AttrSpec('#ddb', '#004', 256) # closest colors will be found AttrSpec('#dda', '#006') >>> AttrSpec('#ddb', '#004', 88) AttrSpec('#ccc', '#000', colors=88) """ if colors not in (1, 16, 88, 256): raise AttrSpecError('invalid number of colors (%d).' % colors) self._value = 0 \| _HIGH_88_COLOR * (colors == 88) self.foreground = fg self.background = bg if self.colors > colors: raise AttrSpecError(('foreground/background (%s/%s) require ' + 'more colors than have been specified (%d).') % (repr(fg), repr(bg), colors)) foreground_basic = property(lambda s: s._value & _FG_BASIC_COLOR != 0) foreground_high = property(lambda s: s._value & _FG_HIGH_COLOR != 0) foreground_number = property(lambda s: s._value & _FG_COLOR_MASK) background_basic = property(lambda s: s._value & _BG_BASIC_COLOR != 0) background_high = property(lambda s: s._value & _BG_HIGH_COLOR != 0) background_number = property(lambda s: (s._value & _BG_COLOR_MASK) >> _BG_SHIFT) italics = property(lambda s: s._value & _ITALICS != 0) bold = property(lambda s: s._value & _BOLD != 0) underline = property(lambda s: s._value & _UNDERLINE != 0) blink = property(lambda s: s._value & _BLINK != 0) standout = property(lambda s: s._value & _STANDOUT != 0) strikethrough = property(lambda s: s._value & _STRIKETHROUGH != 0) def _colors(self): """ Return the maximum colors required for this object. Returns 256, 88, 16 or 1. """ if self._value & _HIGH_88_COLOR: return 88 if self._value & (_BG_HIGH_COLOR \| _FG_HIGH_COLOR): return 256 if self._value & (_BG_BASIC_COLOR \| _BG_BASIC_COLOR): return 16 return 1 colors = property(_colors) def __repr__(self): """ Return an executable python representation of the AttrSpec object. """ args = "%r, %r" % (self.foreground, self.background) if self.colors == 88: # 88-color mode is the only one that is handled differently args = args + ", colors=88" return "%s(%s)" % (self.__class__.__name__, args) def _foreground_color(self): """Return only the color component of the foreground.""" if not (self.foreground_basic or self.foreground_high): return 'default' if self.foreground_basic: return _BASIC_COLORS[self.foreground_number] if self.colors == 88: return _color_desc_88(self.foreground_number) return _color_desc_256(self.foreground_number) def _foreground(self): return (self._foreground_color() + ',bold' * self.bold + ',italics' * self.italics + ',standout' * self.standout + ',blink' * self.blink + ',underline' * self.underline + ',strikethrough' * self.strikethrough) def _set_foreground(self, foreground): color = None flags = 0 # handle comma-separated foreground for part in foreground.split(','): part = part.strip() if part in _ATTRIBUTES: # parse and store "settings"/attributes in flags if flags & _ATTRIBUTES[part]: raise AttrSpecError(("Setting %s specified more than" + "once in foreground (%s)") % (repr(part), repr(foreground))) flags \|= _ATTRIBUTES[part] continue # past this point we must be specifying a color if part in ('', 'default'): scolor = 0 elif part in _BASIC_COLORS: scolor = _BASIC_COLORS.index(part) flags \|= _FG_BASIC_COLOR elif self._value & _HIGH_88_COLOR: scolor = _parse_color_88(part) flags \|= _FG_HIGH_COLOR else: scolor = _parse_color_256(part) flags \|= _FG_HIGH_COLOR # _parse_color_() return None for unrecognised colors if scolor is None: raise AttrSpecError(("Unrecognised color specification %s " + "in foreground (%s)") % (repr(part), repr(foreground))) if color is not None: raise AttrSpecError(("More than one color given for " + "foreground (%s)") % (repr(foreground),)) color = scolor if color is None: color = 0 self._value = (self._value & ~_FG_MASK) \| color \| flags foreground = property(_foreground, _set_foreground) def _background(self): """Return the background color.""" if not (self.background_basic or self.background_high): return 'default' if self.background_basic: return _BASIC_COLORS[self.background_number] if self._value & _HIGH_88_COLOR: return _color_desc_88(self.background_number) return _color_desc_256(self.background_number) def _set_background(self, background): flags = 0 if background in ('', 'default'): color = 0 elif background in _BASIC_COLORS: color = _BASIC_COLORS.index(background) flags \|= _BG_BASIC_COLOR elif self._value & _HIGH_88_COLOR: color = _parse_color_88(background) flags \|= _BG_HIGH_COLOR else: color = _parse_color_256(background) flags \|= _BG_HIGH_COLOR if color is None: raise AttrSpecError(("Unrecognised color specification " + "in background (%s)") % (repr(background),)) self._value = (self._value & ~_BG_MASK) \| (color << _BG_SHIFT) \| flags background = property(_background, _set_background) def get_rgb_values(self): """ Return (fg_red, fg_green, fg_blue, bg_red, bg_green, bg_blue) color components. Each component is in the range 0-255. Values are taken from the XTerm defaults and may not exactly match the user's terminal. If the foreground or background is 'default' then all their compenents will be returned as None. >>> AttrSpec('yellow', '#ccf', colors=88).get_rgb_values() (255, 255, 0, 205, 205, 255) >>> AttrSpec('default', 'g92').get_rgb_values() (None, None, None, 238, 238, 238) """ if not (self.foreground_basic or self.foreground_high): vals = (None, None, None) elif self.colors == 88: assert self.foreground_number < 88, "Invalid AttrSpec _value" vals = _COLOR_VALUES_88[self.foreground_number] else: vals = _COLOR_VALUES_256[self.foreground_number] if not (self.background_basic or self.background_high): return vals + (None, None, None) elif self.colors == 88: assert self.background_number < 88, "Invalid AttrSpec _value" return vals + _COLOR_VALUES_88[self.background_number] else: return vals + _COLOR_VALUES_256[self.background_number] def __eq__(self, other): return isinstance(other, AttrSpec) and self._value == other._value def __ne__(self, other): return not self == other __hash__ = object.__hash__ class RealTerminal(object): def __init__(self): super(RealTerminal,self).__init__() self._signal_keys_set = False self._old_signal_keys = None def tty_signal_keys(self, intr=None, quit=None, start=None, stop=None, susp=None, fileno=None): """ Read and/or set the tty's signal character settings. This function returns the current settings as a tuple. Use the string 'undefined' to unmap keys from their signals. The value None is used when no change is being made. Setting signal keys is done using the integer ascii code for the key, eg. 3 for CTRL+C. If this function is called after start() has been called then the original settings will be restored when stop() is called. """ if fileno is None: fileno = sys.stdin.fileno() if not os.isatty(fileno): return tattr = termios.tcgetattr(fileno) sattr = tattr[6] skeys = (sattr[termios.VINTR], sattr[termios.VQUIT], sattr[termios.VSTART], sattr[termios.VSTOP], sattr[termios.VSUSP]) if intr == 'undefined': intr = 0 if quit == 'undefined': quit = 0 if start == 'undefined': start = 0 if stop == 'undefined': stop = 0 if susp == 'undefined': susp = 0 if intr is not None: tattr[6][termios.VINTR] = intr if quit is not None: tattr[6][termios.VQUIT] = quit if start is not None: tattr[6][termios.VSTART] = start if stop is not None: tattr[6][termios.VSTOP] = stop if susp is not None: tattr[6][termios.VSUSP] = susp if intr is not None or quit is not None or \ start is not None or stop is not None or \ susp is not None: termios.tcsetattr(fileno, termios.TCSADRAIN, tattr) self._signal_keys_set = True return skeys class ScreenError(Exception): pass class BaseScreen(with_metaclass(signals.MetaSignals, object)): """ Base class for Screen classes (raw_display.Screen, .. etc) """ signals = [UPDATE_PALETTE_ENTRY, INPUT_DESCRIPTORS_CHANGED] def __init__(self): super(BaseScreen,self).__init__() self._palette = {} self._started = False started = property(lambda self: self._started) def start(self, args, *kwargs): """Set up the screen. If the screen has already been started, does nothing. May be used as a context manager, in which case :meth:`stop` will automatically be called at the end of the block: with screen.start(): ... You shouldn't override this method in a subclass; instead, override :meth:`_start`. """ if not self._started: self._start(args, *kwargs) self._started = True return StoppingContext(self) def _start(self): pass def stop(self): if self._started: self._stop() self._started = False def _stop(self): pass def run_wrapper(self, fn, args, *kwargs): """Start the screen, call a function, then stop the screen. Extra arguments are passed to `start`. Deprecated in favor of calling `start` as a context manager. """ with self.start(args, *kwargs): return fn() def register_palette(self, palette): """Register a set of palette entries. palette -- a list of (name, like_other_name) or (name, foreground, background, mono, foreground_high, background_high) tuples The (name, like_other_name) format will copy the settings from the palette entry like_other_name, which must appear before this tuple in the list. The mono and foreground/background_high values are optional ie. the second tuple format may have 3, 4 or 6 values. See register_palette_entry() for a description of the tuple values. """ for item in palette: if len(item) in (3,4,6): self.register_palette_entry(item) continue if len(item) != 2: raise ScreenError("Invalid register_palette entry: %s" % repr(item)) name, like_name = item if like_name not in self._palette: raise ScreenError("palette entry '%s' doesn't exist"%like_name) self._palette[name] = self._palette[like_name] def register_palette_entry(self, name, foreground, background, mono=None, foreground_high=None, background_high=None): """Register a single palette entry. name -- new entry/attribute name foreground -- a string containing a comma-separated foreground color and settings Color values: 'default' (use the terminal's default foreground), 'black', 'dark red', 'dark green', 'brown', 'dark blue', 'dark magenta', 'dark cyan', 'light gray', 'dark gray', 'light red', 'light green', 'yellow', 'light blue', 'light magenta', 'light cyan', 'white' Settings: 'bold', 'underline', 'blink', 'standout', 'strikethrough' Some terminals use 'bold' for bright colors. Most terminals ignore the 'blink' setting. If the color is not given then 'default' will be assumed. background -- a string containing the background color Background color values: 'default' (use the terminal's default background), 'black', 'dark red', 'dark green', 'brown', 'dark blue', 'dark magenta', 'dark cyan', 'light gray' mono -- a comma-separated string containing monochrome terminal settings (see "Settings" above.) None = no terminal settings (same as 'default') foreground_high -- a string containing a comma-separated foreground color and settings, standard foreground colors (see "Color values" above) or high-colors may be used High-color example values: '#009' (0% red, 0% green, 60% red, like HTML colors) '#fcc' (100% red, 80% green, 80% blue) 'g40' (40% gray, decimal), 'g#cc' (80% gray, hex), '#000', 'g0', 'g#00' (black), '#fff', 'g100', 'g#ff' (white) 'h8' (color number 8), 'h255' (color number 255) None = use foreground parameter value background_high -- a string containing the background color, standard background colors (see "Background colors" above) or high-colors (see "High-color example values" above) may be used None = use background parameter value """ basic = AttrSpec(foreground, background, 16) if type(mono) == tuple: # old style of specifying mono attributes was to put them # in a tuple. convert to comma-separated string mono = ",".join(mono) if mono is None: mono = DEFAULT mono = AttrSpec(mono, DEFAULT, 1) if foreground_high is None: foreground_high = foreground if background_high is None: background_high = background high_256 = AttrSpec(foreground_high, background_high, 256) # 'hX' where X > 15 are different in 88/256 color, use # basic colors for 88-color mode if high colors are specified # in this way (also avoids crash when X > 87) def large_h(desc): if not desc.startswith('h'): return False if ',' in desc: desc = desc.split(',',1)[0] num = int(desc[1:], 10) return num > 15 if large_h(foreground_high) or large_h(background_high): high_88 = basic else: high_88 = AttrSpec(foreground_high, background_high, 88) signals.emit_signal(self, UPDATE_PALETTE_ENTRY, name, basic, mono, high_88, high_256) self._palette[name] = (basic, mono, high_88, high_256) def _test(): import doctest doctest.testmod() if __name__=='__main__': _test()

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