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