686 lines
21 KiB
Python
686 lines
21 KiB
Python
"""
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Output for vt100 terminals.
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A lot of thanks, regarding outputting of colors, goes to the Pygments project:
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(We don't rely on Pygments anymore, because many things are very custom, and
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everything has been highly optimized.)
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http://pygments.org/
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"""
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import array
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import errno
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import sys
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from typing import (
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IO,
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Callable,
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Dict,
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Hashable,
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Iterable,
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List,
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Optional,
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Sequence,
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Set,
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TextIO,
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Tuple,
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)
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from prompt_toolkit.data_structures import Size
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from prompt_toolkit.output import Output
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from prompt_toolkit.styles import ANSI_COLOR_NAMES, Attrs
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from .color_depth import ColorDepth
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__all__ = [
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"Vt100_Output",
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]
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FG_ANSI_COLORS = {
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"ansidefault": 39,
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# Low intensity.
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"ansiblack": 30,
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"ansired": 31,
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"ansigreen": 32,
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"ansiyellow": 33,
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"ansiblue": 34,
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"ansimagenta": 35,
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"ansicyan": 36,
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"ansigray": 37,
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# High intensity.
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"ansibrightblack": 90,
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"ansibrightred": 91,
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"ansibrightgreen": 92,
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"ansibrightyellow": 93,
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"ansibrightblue": 94,
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"ansibrightmagenta": 95,
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"ansibrightcyan": 96,
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"ansiwhite": 97,
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}
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BG_ANSI_COLORS = {
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"ansidefault": 49,
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# Low intensity.
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"ansiblack": 40,
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"ansired": 41,
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"ansigreen": 42,
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"ansiyellow": 43,
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"ansiblue": 44,
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"ansimagenta": 45,
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"ansicyan": 46,
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"ansigray": 47,
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# High intensity.
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"ansibrightblack": 100,
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"ansibrightred": 101,
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"ansibrightgreen": 102,
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"ansibrightyellow": 103,
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"ansibrightblue": 104,
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"ansibrightmagenta": 105,
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"ansibrightcyan": 106,
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"ansiwhite": 107,
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}
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ANSI_COLORS_TO_RGB = {
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"ansidefault": (
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0x00,
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0x00,
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0x00,
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), # Don't use, 'default' doesn't really have a value.
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"ansiblack": (0x00, 0x00, 0x00),
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"ansigray": (0xE5, 0xE5, 0xE5),
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"ansibrightblack": (0x7F, 0x7F, 0x7F),
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"ansiwhite": (0xFF, 0xFF, 0xFF),
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# Low intensity.
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"ansired": (0xCD, 0x00, 0x00),
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"ansigreen": (0x00, 0xCD, 0x00),
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"ansiyellow": (0xCD, 0xCD, 0x00),
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"ansiblue": (0x00, 0x00, 0xCD),
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"ansimagenta": (0xCD, 0x00, 0xCD),
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"ansicyan": (0x00, 0xCD, 0xCD),
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# High intensity.
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"ansibrightred": (0xFF, 0x00, 0x00),
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"ansibrightgreen": (0x00, 0xFF, 0x00),
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"ansibrightyellow": (0xFF, 0xFF, 0x00),
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"ansibrightblue": (0x00, 0x00, 0xFF),
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"ansibrightmagenta": (0xFF, 0x00, 0xFF),
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"ansibrightcyan": (0x00, 0xFF, 0xFF),
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}
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assert set(FG_ANSI_COLORS) == set(ANSI_COLOR_NAMES)
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assert set(BG_ANSI_COLORS) == set(ANSI_COLOR_NAMES)
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assert set(ANSI_COLORS_TO_RGB) == set(ANSI_COLOR_NAMES)
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def _get_closest_ansi_color(r: int, g: int, b: int, exclude: Sequence[str] = ()) -> str:
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"""
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Find closest ANSI color. Return it by name.
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:param r: Red (Between 0 and 255.)
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:param g: Green (Between 0 and 255.)
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:param b: Blue (Between 0 and 255.)
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:param exclude: A tuple of color names to exclude. (E.g. ``('ansired', )``.)
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"""
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exclude = list(exclude)
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# When we have a bit of saturation, avoid the gray-like colors, otherwise,
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# too often the distance to the gray color is less.
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saturation = abs(r - g) + abs(g - b) + abs(b - r) # Between 0..510
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if saturation > 30:
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exclude.extend(["ansilightgray", "ansidarkgray", "ansiwhite", "ansiblack"])
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# Take the closest color.
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# (Thanks to Pygments for this part.)
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distance = 257 * 257 * 3 # "infinity" (>distance from #000000 to #ffffff)
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match = "ansidefault"
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for name, (r2, g2, b2) in ANSI_COLORS_TO_RGB.items():
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if name != "ansidefault" and name not in exclude:
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d = (r - r2) ** 2 + (g - g2) ** 2 + (b - b2) ** 2
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if d < distance:
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match = name
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distance = d
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return match
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_ColorCodeAndName = Tuple[int, str]
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class _16ColorCache:
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"""
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Cache which maps (r, g, b) tuples to 16 ansi colors.
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:param bg: Cache for background colors, instead of foreground.
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"""
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def __init__(self, bg: bool = False) -> None:
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self.bg = bg
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self._cache: Dict[Hashable, _ColorCodeAndName] = {}
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def get_code(
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self, value: Tuple[int, int, int], exclude: Sequence[str] = ()
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) -> _ColorCodeAndName:
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"""
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Return a (ansi_code, ansi_name) tuple. (E.g. ``(44, 'ansiblue')``.) for
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a given (r,g,b) value.
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"""
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key: Hashable = (value, tuple(exclude))
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cache = self._cache
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if key not in cache:
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cache[key] = self._get(value, exclude)
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return cache[key]
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def _get(
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self, value: Tuple[int, int, int], exclude: Sequence[str] = ()
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) -> _ColorCodeAndName:
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r, g, b = value
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match = _get_closest_ansi_color(r, g, b, exclude=exclude)
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# Turn color name into code.
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if self.bg:
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code = BG_ANSI_COLORS[match]
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else:
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code = FG_ANSI_COLORS[match]
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return code, match
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class _256ColorCache(Dict[Tuple[int, int, int], int]):
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"""
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Cache which maps (r, g, b) tuples to 256 colors.
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"""
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def __init__(self) -> None:
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# Build color table.
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colors: List[Tuple[int, int, int]] = []
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# colors 0..15: 16 basic colors
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colors.append((0x00, 0x00, 0x00)) # 0
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colors.append((0xCD, 0x00, 0x00)) # 1
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colors.append((0x00, 0xCD, 0x00)) # 2
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colors.append((0xCD, 0xCD, 0x00)) # 3
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colors.append((0x00, 0x00, 0xEE)) # 4
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colors.append((0xCD, 0x00, 0xCD)) # 5
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colors.append((0x00, 0xCD, 0xCD)) # 6
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colors.append((0xE5, 0xE5, 0xE5)) # 7
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colors.append((0x7F, 0x7F, 0x7F)) # 8
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colors.append((0xFF, 0x00, 0x00)) # 9
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colors.append((0x00, 0xFF, 0x00)) # 10
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colors.append((0xFF, 0xFF, 0x00)) # 11
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colors.append((0x5C, 0x5C, 0xFF)) # 12
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colors.append((0xFF, 0x00, 0xFF)) # 13
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colors.append((0x00, 0xFF, 0xFF)) # 14
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colors.append((0xFF, 0xFF, 0xFF)) # 15
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# colors 16..232: the 6x6x6 color cube
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valuerange = (0x00, 0x5F, 0x87, 0xAF, 0xD7, 0xFF)
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for i in range(217):
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r = valuerange[(i // 36) % 6]
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g = valuerange[(i // 6) % 6]
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b = valuerange[i % 6]
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colors.append((r, g, b))
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# colors 233..253: grayscale
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for i in range(1, 22):
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v = 8 + i * 10
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colors.append((v, v, v))
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self.colors = colors
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def __missing__(self, value: Tuple[int, int, int]) -> int:
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r, g, b = value
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# Find closest color.
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# (Thanks to Pygments for this!)
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distance = 257 * 257 * 3 # "infinity" (>distance from #000000 to #ffffff)
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match = 0
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for i, (r2, g2, b2) in enumerate(self.colors):
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if i >= 16: # XXX: We ignore the 16 ANSI colors when mapping RGB
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# to the 256 colors, because these highly depend on
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# the color scheme of the terminal.
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d = (r - r2) ** 2 + (g - g2) ** 2 + (b - b2) ** 2
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if d < distance:
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match = i
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distance = d
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# Turn color name into code.
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self[value] = match
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return match
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_16_fg_colors = _16ColorCache(bg=False)
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_16_bg_colors = _16ColorCache(bg=True)
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_256_colors = _256ColorCache()
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class _EscapeCodeCache(Dict[Attrs, str]):
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"""
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Cache for VT100 escape codes. It maps
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(fgcolor, bgcolor, bold, underline, reverse) tuples to VT100 escape sequences.
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:param true_color: When True, use 24bit colors instead of 256 colors.
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"""
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def __init__(self, color_depth: ColorDepth) -> None:
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self.color_depth = color_depth
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def __missing__(self, attrs: Attrs) -> str:
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fgcolor, bgcolor, bold, underline, italic, blink, reverse, hidden = attrs
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parts: List[str] = []
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parts.extend(self._colors_to_code(fgcolor or "", bgcolor or ""))
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if bold:
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parts.append("1")
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if italic:
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parts.append("3")
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if blink:
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parts.append("5")
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if underline:
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parts.append("4")
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if reverse:
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parts.append("7")
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if hidden:
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parts.append("8")
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if parts:
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result = "\x1b[0;" + ";".join(parts) + "m"
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else:
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result = "\x1b[0m"
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self[attrs] = result
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return result
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def _color_name_to_rgb(self, color: str) -> Tuple[int, int, int]:
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" Turn 'ffffff', into (0xff, 0xff, 0xff). "
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try:
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rgb = int(color, 16)
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except ValueError:
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raise
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else:
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r = (rgb >> 16) & 0xFF
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g = (rgb >> 8) & 0xFF
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b = rgb & 0xFF
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return r, g, b
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def _colors_to_code(self, fg_color: str, bg_color: str) -> Iterable[str]:
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"""
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Return a tuple with the vt100 values that represent this color.
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"""
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# When requesting ANSI colors only, and both fg/bg color were converted
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# to ANSI, ensure that the foreground and background color are not the
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# same. (Unless they were explicitly defined to be the same color.)
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fg_ansi = ""
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def get(color: str, bg: bool) -> List[int]:
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nonlocal fg_ansi
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table = BG_ANSI_COLORS if bg else FG_ANSI_COLORS
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if not color or self.color_depth == ColorDepth.DEPTH_1_BIT:
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return []
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# 16 ANSI colors. (Given by name.)
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elif color in table:
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return [table[color]]
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# RGB colors. (Defined as 'ffffff'.)
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else:
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try:
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rgb = self._color_name_to_rgb(color)
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except ValueError:
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return []
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# When only 16 colors are supported, use that.
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if self.color_depth == ColorDepth.DEPTH_4_BIT:
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if bg: # Background.
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if fg_color != bg_color:
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exclude = [fg_ansi]
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else:
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exclude = []
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code, name = _16_bg_colors.get_code(rgb, exclude=exclude)
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return [code]
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else: # Foreground.
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code, name = _16_fg_colors.get_code(rgb)
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fg_ansi = name
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return [code]
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# True colors. (Only when this feature is enabled.)
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elif self.color_depth == ColorDepth.DEPTH_24_BIT:
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r, g, b = rgb
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return [(48 if bg else 38), 2, r, g, b]
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# 256 RGB colors.
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else:
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return [(48 if bg else 38), 5, _256_colors[rgb]]
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result: List[int] = []
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result.extend(get(fg_color, False))
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result.extend(get(bg_color, True))
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return map(str, result)
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def _get_size(fileno: int) -> Tuple[int, int]:
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# Thanks to fabric (fabfile.org), and
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# http://sqizit.bartletts.id.au/2011/02/14/pseudo-terminals-in-python/
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"""
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Get the size of this pseudo terminal.
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:param fileno: stdout.fileno()
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:returns: A (rows, cols) tuple.
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"""
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# Inline imports, because these modules are not available on Windows.
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# (This file is used by ConEmuOutput, which is used on Windows.)
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import fcntl
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import termios
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# Buffer for the C call
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buf = array.array("h", [0, 0, 0, 0])
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# Do TIOCGWINSZ (Get)
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# Note: We should not pass 'True' as a fourth parameter to 'ioctl'. (True
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# is the default.) This causes segmentation faults on some systems.
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# See: https://github.com/jonathanslenders/python-prompt-toolkit/pull/364
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fcntl.ioctl(fileno, termios.TIOCGWINSZ, buf) # type: ignore
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# Return rows, cols
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return buf[0], buf[1]
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class Vt100_Output(Output):
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"""
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:param get_size: A callable which returns the `Size` of the output terminal.
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:param stdout: Any object with has a `write` and `flush` method + an 'encoding' property.
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:param term: The terminal environment variable. (xterm, xterm-256color, linux, ...)
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:param write_binary: Encode the output before writing it. If `True` (the
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default), the `stdout` object is supposed to expose an `encoding` attribute.
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"""
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# For the error messages. Only display "Output is not a terminal" once per
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# file descriptor.
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_fds_not_a_terminal: Set[int] = set()
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def __init__(
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self,
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stdout: TextIO,
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get_size: Callable[[], Size],
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term: Optional[str] = None,
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write_binary: bool = True,
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) -> None:
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assert all(hasattr(stdout, a) for a in ("write", "flush"))
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if write_binary:
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assert hasattr(stdout, "encoding")
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self._buffer: List[str] = []
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self.stdout = stdout
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self.write_binary = write_binary
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self._get_size = get_size
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self.term = term or "xterm"
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# Cache for escape codes.
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self._escape_code_caches: Dict[ColorDepth, _EscapeCodeCache] = {
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ColorDepth.DEPTH_1_BIT: _EscapeCodeCache(ColorDepth.DEPTH_1_BIT),
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ColorDepth.DEPTH_4_BIT: _EscapeCodeCache(ColorDepth.DEPTH_4_BIT),
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ColorDepth.DEPTH_8_BIT: _EscapeCodeCache(ColorDepth.DEPTH_8_BIT),
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ColorDepth.DEPTH_24_BIT: _EscapeCodeCache(ColorDepth.DEPTH_24_BIT),
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}
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@classmethod
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def from_pty(cls, stdout: TextIO, term: Optional[str] = None) -> "Vt100_Output":
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"""
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Create an Output class from a pseudo terminal.
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(This will take the dimensions by reading the pseudo
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terminal attributes.)
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"""
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# Normally, this requires a real TTY device, but people instantiate
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# this class often during unit tests as well. For convenience, we print
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# an error message, use standard dimensions, and go on.
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fd = stdout.fileno()
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if not stdout.isatty() and fd not in cls._fds_not_a_terminal:
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msg = "Warning: Output is not a terminal (fd=%r).\n"
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sys.stderr.write(msg % fd)
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sys.stderr.flush()
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cls._fds_not_a_terminal.add(fd)
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def get_size() -> Size:
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# If terminal (incorrectly) reports its size as 0, pick a
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# reasonable default. See
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# https://github.com/ipython/ipython/issues/10071
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rows, columns = (None, None)
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# It is possible that `stdout` is no longer a TTY device at this
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# point. In that case we get an `OSError` in the ioctl call in
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# `get_size`. See:
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# https://github.com/prompt-toolkit/python-prompt-toolkit/pull/1021
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try:
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rows, columns = _get_size(stdout.fileno())
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except OSError:
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pass
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return Size(rows=rows or 24, columns=columns or 80)
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return cls(stdout, get_size, term=term)
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def get_size(self) -> Size:
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return self._get_size()
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def fileno(self) -> int:
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" Return file descriptor. "
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return self.stdout.fileno()
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def encoding(self) -> str:
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" Return encoding used for stdout. "
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return self.stdout.encoding
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def write_raw(self, data: str) -> None:
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"""
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Write raw data to output.
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"""
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self._buffer.append(data)
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def write(self, data: str) -> None:
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"""
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Write text to output.
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(Removes vt100 escape codes. -- used for safely writing text.)
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"""
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self._buffer.append(data.replace("\x1b", "?"))
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def set_title(self, title: str) -> None:
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"""
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Set terminal title.
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"""
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if self.term not in (
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"linux",
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"eterm-color",
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): # Not supported by the Linux console.
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self.write_raw(
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"\x1b]2;%s\x07" % title.replace("\x1b", "").replace("\x07", "")
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)
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|
def clear_title(self) -> None:
|
|
self.set_title("")
|
|
|
|
def erase_screen(self) -> None:
|
|
"""
|
|
Erases the screen with the background colour and moves the cursor to
|
|
home.
|
|
"""
|
|
self.write_raw("\x1b[2J")
|
|
|
|
def enter_alternate_screen(self) -> None:
|
|
self.write_raw("\x1b[?1049h\x1b[H")
|
|
|
|
def quit_alternate_screen(self) -> None:
|
|
self.write_raw("\x1b[?1049l")
|
|
|
|
def enable_mouse_support(self) -> None:
|
|
self.write_raw("\x1b[?1000h")
|
|
|
|
# Enable urxvt Mouse mode. (For terminals that understand this.)
|
|
self.write_raw("\x1b[?1015h")
|
|
|
|
# Also enable Xterm SGR mouse mode. (For terminals that understand this.)
|
|
self.write_raw("\x1b[?1006h")
|
|
|
|
# Note: E.g. lxterminal understands 1000h, but not the urxvt or sgr
|
|
# extensions.
|
|
|
|
def disable_mouse_support(self) -> None:
|
|
self.write_raw("\x1b[?1000l")
|
|
self.write_raw("\x1b[?1015l")
|
|
self.write_raw("\x1b[?1006l")
|
|
|
|
def erase_end_of_line(self) -> None:
|
|
"""
|
|
Erases from the current cursor position to the end of the current line.
|
|
"""
|
|
self.write_raw("\x1b[K")
|
|
|
|
def erase_down(self) -> None:
|
|
"""
|
|
Erases the screen from the current line down to the bottom of the
|
|
screen.
|
|
"""
|
|
self.write_raw("\x1b[J")
|
|
|
|
def reset_attributes(self) -> None:
|
|
self.write_raw("\x1b[0m")
|
|
|
|
def set_attributes(self, attrs: Attrs, color_depth: ColorDepth) -> None:
|
|
"""
|
|
Create new style and output.
|
|
|
|
:param attrs: `Attrs` instance.
|
|
"""
|
|
# Get current depth.
|
|
escape_code_cache = self._escape_code_caches[color_depth]
|
|
|
|
# Write escape character.
|
|
self.write_raw(escape_code_cache[attrs])
|
|
|
|
def disable_autowrap(self) -> None:
|
|
self.write_raw("\x1b[?7l")
|
|
|
|
def enable_autowrap(self) -> None:
|
|
self.write_raw("\x1b[?7h")
|
|
|
|
def enable_bracketed_paste(self) -> None:
|
|
self.write_raw("\x1b[?2004h")
|
|
|
|
def disable_bracketed_paste(self) -> None:
|
|
self.write_raw("\x1b[?2004l")
|
|
|
|
def cursor_goto(self, row: int = 0, column: int = 0) -> None:
|
|
"""
|
|
Move cursor position.
|
|
"""
|
|
self.write_raw("\x1b[%i;%iH" % (row, column))
|
|
|
|
def cursor_up(self, amount: int) -> None:
|
|
if amount == 0:
|
|
pass
|
|
elif amount == 1:
|
|
self.write_raw("\x1b[A")
|
|
else:
|
|
self.write_raw("\x1b[%iA" % amount)
|
|
|
|
def cursor_down(self, amount: int) -> None:
|
|
if amount == 0:
|
|
pass
|
|
elif amount == 1:
|
|
# Note: Not the same as '\n', '\n' can cause the window content to
|
|
# scroll.
|
|
self.write_raw("\x1b[B")
|
|
else:
|
|
self.write_raw("\x1b[%iB" % amount)
|
|
|
|
def cursor_forward(self, amount: int) -> None:
|
|
if amount == 0:
|
|
pass
|
|
elif amount == 1:
|
|
self.write_raw("\x1b[C")
|
|
else:
|
|
self.write_raw("\x1b[%iC" % amount)
|
|
|
|
def cursor_backward(self, amount: int) -> None:
|
|
if amount == 0:
|
|
pass
|
|
elif amount == 1:
|
|
self.write_raw("\b") # '\x1b[D'
|
|
else:
|
|
self.write_raw("\x1b[%iD" % amount)
|
|
|
|
def hide_cursor(self) -> None:
|
|
self.write_raw("\x1b[?25l")
|
|
|
|
def show_cursor(self) -> None:
|
|
self.write_raw("\x1b[?12l\x1b[?25h") # Stop blinking cursor and show.
|
|
|
|
def flush(self) -> None:
|
|
"""
|
|
Write to output stream and flush.
|
|
"""
|
|
if not self._buffer:
|
|
return
|
|
|
|
data = "".join(self._buffer)
|
|
|
|
try:
|
|
# (We try to encode ourself, because that way we can replace
|
|
# characters that don't exist in the character set, avoiding
|
|
# UnicodeEncodeError crashes. E.g. u'\xb7' does not appear in 'ascii'.)
|
|
# My Arch Linux installation of july 2015 reported 'ANSI_X3.4-1968'
|
|
# for sys.stdout.encoding in xterm.
|
|
out: IO
|
|
if self.write_binary:
|
|
if hasattr(self.stdout, "buffer"):
|
|
out = self.stdout.buffer # Py3.
|
|
else:
|
|
out = self.stdout
|
|
out.write(data.encode(self.stdout.encoding or "utf-8", "replace"))
|
|
else:
|
|
self.stdout.write(data)
|
|
|
|
self.stdout.flush()
|
|
except IOError as e:
|
|
if e.args and e.args[0] == errno.EINTR:
|
|
# Interrupted system call. Can happen in case of a window
|
|
# resize signal. (Just ignore. The resize handler will render
|
|
# again anyway.)
|
|
pass
|
|
elif e.args and e.args[0] == 0:
|
|
# This can happen when there is a lot of output and the user
|
|
# sends a KeyboardInterrupt by pressing Control-C. E.g. in
|
|
# a Python REPL when we execute "while True: print('test')".
|
|
# (The `ptpython` REPL uses this `Output` class instead of
|
|
# `stdout` directly -- in order to be network transparent.)
|
|
# So, just ignore.
|
|
pass
|
|
else:
|
|
raise
|
|
|
|
self._buffer = []
|
|
|
|
def ask_for_cpr(self) -> None:
|
|
"""
|
|
Asks for a cursor position report (CPR).
|
|
"""
|
|
self.write_raw("\x1b[6n")
|
|
self.flush()
|
|
|
|
def bell(self) -> None:
|
|
" Sound bell. "
|
|
self.write_raw("\a")
|
|
self.flush()
|