Varia's website
https://varia.zone
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376 lines
14 KiB
376 lines
14 KiB
6 days ago
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import sys
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from threading import Event, RLock, Thread
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from types import TracebackType
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from typing import IO, Any, Callable, List, Optional, TextIO, Type, cast
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from . import get_console
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from .console import Console, ConsoleRenderable, RenderableType, RenderHook
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from .control import Control
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from .file_proxy import FileProxy
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from .jupyter import JupyterMixin
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from .live_render import LiveRender, VerticalOverflowMethod
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from .screen import Screen
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from .text import Text
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class _RefreshThread(Thread):
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"""A thread that calls refresh() at regular intervals."""
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def __init__(self, live: "Live", refresh_per_second: float) -> None:
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self.live = live
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self.refresh_per_second = refresh_per_second
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self.done = Event()
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super().__init__(daemon=True)
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def stop(self) -> None:
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self.done.set()
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def run(self) -> None:
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while not self.done.wait(1 / self.refresh_per_second):
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with self.live._lock:
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if not self.done.is_set():
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self.live.refresh()
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class Live(JupyterMixin, RenderHook):
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"""Renders an auto-updating live display of any given renderable.
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Args:
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renderable (RenderableType, optional): The renderable to live display. Defaults to displaying nothing.
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console (Console, optional): Optional Console instance. Defaults to an internal Console instance writing to stdout.
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screen (bool, optional): Enable alternate screen mode. Defaults to False.
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auto_refresh (bool, optional): Enable auto refresh. If disabled, you will need to call `refresh()` or `update()` with refresh flag. Defaults to True
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refresh_per_second (float, optional): Number of times per second to refresh the live display. Defaults to 4.
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transient (bool, optional): Clear the renderable on exit (has no effect when screen=True). Defaults to False.
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redirect_stdout (bool, optional): Enable redirection of stdout, so ``print`` may be used. Defaults to True.
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redirect_stderr (bool, optional): Enable redirection of stderr. Defaults to True.
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vertical_overflow (VerticalOverflowMethod, optional): How to handle renderable when it is too tall for the console. Defaults to "ellipsis".
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get_renderable (Callable[[], RenderableType], optional): Optional callable to get renderable. Defaults to None.
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"""
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def __init__(
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self,
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renderable: Optional[RenderableType] = None,
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*,
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console: Optional[Console] = None,
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screen: bool = False,
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auto_refresh: bool = True,
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refresh_per_second: float = 4,
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transient: bool = False,
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redirect_stdout: bool = True,
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redirect_stderr: bool = True,
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vertical_overflow: VerticalOverflowMethod = "ellipsis",
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get_renderable: Optional[Callable[[], RenderableType]] = None,
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) -> None:
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assert refresh_per_second > 0, "refresh_per_second must be > 0"
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self._renderable = renderable
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self.console = console if console is not None else get_console()
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self._screen = screen
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self._alt_screen = False
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self._redirect_stdout = redirect_stdout
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self._redirect_stderr = redirect_stderr
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self._restore_stdout: Optional[IO[str]] = None
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self._restore_stderr: Optional[IO[str]] = None
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self._lock = RLock()
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self.ipy_widget: Optional[Any] = None
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self.auto_refresh = auto_refresh
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self._started: bool = False
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self.transient = True if screen else transient
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self._refresh_thread: Optional[_RefreshThread] = None
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self.refresh_per_second = refresh_per_second
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self.vertical_overflow = vertical_overflow
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self._get_renderable = get_renderable
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self._live_render = LiveRender(
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self.get_renderable(), vertical_overflow=vertical_overflow
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)
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@property
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def is_started(self) -> bool:
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"""Check if live display has been started."""
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return self._started
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def get_renderable(self) -> RenderableType:
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renderable = (
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self._get_renderable()
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if self._get_renderable is not None
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else self._renderable
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)
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return renderable or ""
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def start(self, refresh: bool = False) -> None:
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"""Start live rendering display.
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Args:
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refresh (bool, optional): Also refresh. Defaults to False.
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"""
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with self._lock:
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if self._started:
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return
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self.console.set_live(self)
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self._started = True
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if self._screen:
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self._alt_screen = self.console.set_alt_screen(True)
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self.console.show_cursor(False)
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self._enable_redirect_io()
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self.console.push_render_hook(self)
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if refresh:
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try:
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self.refresh()
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except Exception:
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# If refresh fails, we want to stop the redirection of sys.stderr,
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# so the error stacktrace is properly displayed in the terminal.
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# (or, if the code that calls Rich captures the exception and wants to display something,
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# let this be displayed in the terminal).
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self.stop()
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raise
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if self.auto_refresh:
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self._refresh_thread = _RefreshThread(self, self.refresh_per_second)
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self._refresh_thread.start()
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def stop(self) -> None:
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"""Stop live rendering display."""
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with self._lock:
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if not self._started:
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return
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self.console.clear_live()
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self._started = False
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if self.auto_refresh and self._refresh_thread is not None:
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self._refresh_thread.stop()
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self._refresh_thread = None
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# allow it to fully render on the last even if overflow
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self.vertical_overflow = "visible"
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with self.console:
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try:
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if not self._alt_screen and not self.console.is_jupyter:
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self.refresh()
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finally:
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self._disable_redirect_io()
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self.console.pop_render_hook()
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if not self._alt_screen and self.console.is_terminal:
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self.console.line()
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self.console.show_cursor(True)
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if self._alt_screen:
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self.console.set_alt_screen(False)
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if self.transient and not self._alt_screen:
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self.console.control(self._live_render.restore_cursor())
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if self.ipy_widget is not None and self.transient:
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self.ipy_widget.close() # pragma: no cover
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def __enter__(self) -> "Live":
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self.start(refresh=self._renderable is not None)
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return self
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType],
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) -> None:
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self.stop()
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def _enable_redirect_io(self) -> None:
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"""Enable redirecting of stdout / stderr."""
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if self.console.is_terminal or self.console.is_jupyter:
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if self._redirect_stdout and not isinstance(sys.stdout, FileProxy):
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self._restore_stdout = sys.stdout
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sys.stdout = cast("TextIO", FileProxy(self.console, sys.stdout))
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if self._redirect_stderr and not isinstance(sys.stderr, FileProxy):
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self._restore_stderr = sys.stderr
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sys.stderr = cast("TextIO", FileProxy(self.console, sys.stderr))
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def _disable_redirect_io(self) -> None:
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"""Disable redirecting of stdout / stderr."""
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if self._restore_stdout:
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sys.stdout = cast("TextIO", self._restore_stdout)
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self._restore_stdout = None
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if self._restore_stderr:
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sys.stderr = cast("TextIO", self._restore_stderr)
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self._restore_stderr = None
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@property
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def renderable(self) -> RenderableType:
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"""Get the renderable that is being displayed
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Returns:
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RenderableType: Displayed renderable.
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"""
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renderable = self.get_renderable()
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return Screen(renderable) if self._alt_screen else renderable
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def update(self, renderable: RenderableType, *, refresh: bool = False) -> None:
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"""Update the renderable that is being displayed
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Args:
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renderable (RenderableType): New renderable to use.
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refresh (bool, optional): Refresh the display. Defaults to False.
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"""
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if isinstance(renderable, str):
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renderable = self.console.render_str(renderable)
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with self._lock:
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self._renderable = renderable
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if refresh:
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self.refresh()
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def refresh(self) -> None:
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"""Update the display of the Live Render."""
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with self._lock:
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self._live_render.set_renderable(self.renderable)
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if self.console.is_jupyter: # pragma: no cover
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try:
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from IPython.display import display
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from ipywidgets import Output
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except ImportError:
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import warnings
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warnings.warn('install "ipywidgets" for Jupyter support')
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else:
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if self.ipy_widget is None:
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self.ipy_widget = Output()
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display(self.ipy_widget)
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with self.ipy_widget:
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self.ipy_widget.clear_output(wait=True)
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self.console.print(self._live_render.renderable)
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elif self.console.is_terminal and not self.console.is_dumb_terminal:
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with self.console:
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self.console.print(Control())
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elif (
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not self._started and not self.transient
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): # if it is finished allow files or dumb-terminals to see final result
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with self.console:
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self.console.print(Control())
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def process_renderables(
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self, renderables: List[ConsoleRenderable]
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) -> List[ConsoleRenderable]:
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"""Process renderables to restore cursor and display progress."""
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self._live_render.vertical_overflow = self.vertical_overflow
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if self.console.is_interactive:
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# lock needs acquiring as user can modify live_render renderable at any time unlike in Progress.
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with self._lock:
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reset = (
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Control.home()
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if self._alt_screen
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else self._live_render.position_cursor()
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)
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renderables = [reset, *renderables, self._live_render]
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elif (
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not self._started and not self.transient
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): # if it is finished render the final output for files or dumb_terminals
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renderables = [*renderables, self._live_render]
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return renderables
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if __name__ == "__main__": # pragma: no cover
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import random
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import time
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from itertools import cycle
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from typing import Dict, List, Tuple
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from .align import Align
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from .console import Console
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from .live import Live as Live
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from .panel import Panel
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from .rule import Rule
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from .syntax import Syntax
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from .table import Table
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console = Console()
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syntax = Syntax(
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'''def loop_last(values: Iterable[T]) -> Iterable[Tuple[bool, T]]:
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"""Iterate and generate a tuple with a flag for last value."""
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iter_values = iter(values)
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try:
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previous_value = next(iter_values)
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except StopIteration:
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return
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for value in iter_values:
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yield False, previous_value
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previous_value = value
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yield True, previous_value''',
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"python",
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line_numbers=True,
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)
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table = Table("foo", "bar", "baz")
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table.add_row("1", "2", "3")
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progress_renderables = [
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"You can make the terminal shorter and taller to see the live table hide"
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"Text may be printed while the progress bars are rendering.",
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Panel("In fact, [i]any[/i] renderable will work"),
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"Such as [magenta]tables[/]...",
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table,
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"Pretty printed structures...",
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{"type": "example", "text": "Pretty printed"},
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"Syntax...",
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syntax,
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Rule("Give it a try!"),
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]
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examples = cycle(progress_renderables)
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exchanges = [
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"SGD",
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"MYR",
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"EUR",
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"USD",
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"AUD",
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"JPY",
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"CNH",
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"HKD",
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"CAD",
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"INR",
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"DKK",
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"GBP",
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"RUB",
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"NZD",
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"MXN",
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"IDR",
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"TWD",
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"THB",
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"VND",
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]
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with Live(console=console) as live_table:
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exchange_rate_dict: Dict[Tuple[str, str], float] = {}
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for index in range(100):
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select_exchange = exchanges[index % len(exchanges)]
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for exchange in exchanges:
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if exchange == select_exchange:
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continue
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time.sleep(0.4)
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if random.randint(0, 10) < 1:
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console.log(next(examples))
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exchange_rate_dict[(select_exchange, exchange)] = 200 / (
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(random.random() * 320) + 1
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)
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if len(exchange_rate_dict) > len(exchanges) - 1:
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exchange_rate_dict.pop(list(exchange_rate_dict.keys())[0])
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table = Table(title="Exchange Rates")
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table.add_column("Source Currency")
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table.add_column("Destination Currency")
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table.add_column("Exchange Rate")
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for (source, dest), exchange_rate in exchange_rate_dict.items():
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table.add_row(
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source,
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dest,
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Text(
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f"{exchange_rate:.4f}",
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style="red" if exchange_rate < 1.0 else "green",
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),
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)
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live_table.update(Align.center(table))
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