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import itertools
import sys
from signal import SIGINT, default_int_handler, signal
from typing import Any
from pip._vendor.progress.bar import Bar, FillingCirclesBar, IncrementalBar
from pip._vendor.progress.spinner import Spinner
from pip._internal.utils.compat import WINDOWS
from pip._internal.utils.logging import get_indentation
from pip._internal.utils.misc import format_size
try:
from pip._vendor import colorama
# Lots of different errors can come from this, including SystemError and
# ImportError.
except Exception:
colorama = None
def _select_progress_class(preferred: Bar, fallback: Bar) -> Bar:
encoding = getattr(preferred.file, "encoding", None)
# If we don't know what encoding this file is in, then we'll just assume
# that it doesn't support unicode and use the ASCII bar.
if not encoding:
return fallback
# Collect all of the possible characters we want to use with the preferred
# bar.
characters = [
getattr(preferred, "empty_fill", ""),
getattr(preferred, "fill", ""),
]
characters += list(getattr(preferred, "phases", []))
# Try to decode the characters we're using for the bar using the encoding
# of the given file, if this works then we'll assume that we can use the
# fancier bar and if not we'll fall back to the plaintext bar.
try:
"".join(characters).encode(encoding)
except UnicodeEncodeError:
return fallback
else:
return preferred
_BaseBar: Any = _select_progress_class(IncrementalBar, Bar)
class InterruptibleMixin:
"""
Helper to ensure that self.finish() gets called on keyboard interrupt.
This allows downloads to be interrupted without leaving temporary state
(like hidden cursors) behind.
This class is similar to the progress library's existing SigIntMixin
helper, but as of version 1.2, that helper has the following problems:
1. It calls sys.exit().
2. It discards the existing SIGINT handler completely.
3. It leaves its own handler in place even after an uninterrupted finish,
which will have unexpected delayed effects if the user triggers an
unrelated keyboard interrupt some time after a progress-displaying
download has already completed, for example.
"""
def __init__(self, *args: Any, **kwargs: Any) -> None:
"""
Save the original SIGINT handler for later.
"""
# https://github.com/python/mypy/issues/5887
super().__init__(*args, **kwargs) # type: ignore
self.original_handler = signal(SIGINT, self.handle_sigint)
# If signal() returns None, the previous handler was not installed from
# Python, and we cannot restore it. This probably should not happen,
# but if it does, we must restore something sensible instead, at least.
# The least bad option should be Python's default SIGINT handler, which
# just raises KeyboardInterrupt.
if self.original_handler is None:
self.original_handler = default_int_handler
def finish(self) -> None:
"""
Restore the original SIGINT handler after finishing.
This should happen regardless of whether the progress display finishes
normally, or gets interrupted.
"""
super().finish() # type: ignore
signal(SIGINT, self.original_handler)
def handle_sigint(self, signum, frame): # type: ignore
"""
Call self.finish() before delegating to the original SIGINT handler.
This handler should only be in place while the progress display is
active.
"""
self.finish()
self.original_handler(signum, frame)
class SilentBar(Bar):
def update(self) -> None:
pass
class BlueEmojiBar(IncrementalBar):
suffix = "%(percent)d%%"
bar_prefix = " "
bar_suffix = " "
phases = ("\U0001F539", "\U0001F537", "\U0001F535")
class DownloadProgressMixin:
def __init__(self, *args: Any, **kwargs: Any) -> None:
# https://github.com/python/mypy/issues/5887
super().__init__(*args, **kwargs) # type: ignore
self.message: str = (" " * (get_indentation() + 2)) + self.message
@property
def downloaded(self) -> str:
return format_size(self.index) # type: ignore
@property
def download_speed(self) -> str:
# Avoid zero division errors...
if self.avg == 0.0: # type: ignore
return "..."
return format_size(1 / self.avg) + "/s" # type: ignore
@property
def pretty_eta(self) -> str:
if self.eta: # type: ignore
return f"eta {self.eta_td}" # type: ignore
return ""
def iter(self, it): # type: ignore
for x in it:
yield x
# B305 is incorrectly raised here
# https://github.com/PyCQA/flake8-bugbear/issues/59
self.next(len(x)) # noqa: B305
self.finish()
class WindowsMixin:
def __init__(self, *args: Any, **kwargs: Any) -> None:
# The Windows terminal does not support the hide/show cursor ANSI codes
# even with colorama. So we'll ensure that hide_cursor is False on
# Windows.
# This call needs to go before the super() call, so that hide_cursor
# is set in time. The base progress bar class writes the "hide cursor"
# code to the terminal in its init, so if we don't set this soon
# enough, we get a "hide" with no corresponding "show"...
if WINDOWS and self.hide_cursor: # type: ignore
self.hide_cursor = False
# https://github.com/python/mypy/issues/5887
super().__init__(*args, **kwargs) # type: ignore
# Check if we are running on Windows and we have the colorama module,
# if we do then wrap our file with it.
if WINDOWS and colorama:
self.file = colorama.AnsiToWin32(self.file) # type: ignore
# The progress code expects to be able to call self.file.isatty()
# but the colorama.AnsiToWin32() object doesn't have that, so we'll
# add it.
self.file.isatty = lambda: self.file.wrapped.isatty()
# The progress code expects to be able to call self.file.flush()
# but the colorama.AnsiToWin32() object doesn't have that, so we'll
# add it.
self.file.flush = lambda: self.file.wrapped.flush()
class BaseDownloadProgressBar(WindowsMixin, InterruptibleMixin, DownloadProgressMixin):
file = sys.stdout
message = "%(percent)d%%"
suffix = "%(downloaded)s %(download_speed)s %(pretty_eta)s"
class DefaultDownloadProgressBar(BaseDownloadProgressBar, _BaseBar):
pass
class DownloadSilentBar(BaseDownloadProgressBar, SilentBar):
pass
class DownloadBar(BaseDownloadProgressBar, Bar):
pass
class DownloadFillingCirclesBar(BaseDownloadProgressBar, FillingCirclesBar):
pass
class DownloadBlueEmojiProgressBar(BaseDownloadProgressBar, BlueEmojiBar):
pass
class DownloadProgressSpinner(
WindowsMixin, InterruptibleMixin, DownloadProgressMixin, Spinner
):
file = sys.stdout
suffix = "%(downloaded)s %(download_speed)s"
def next_phase(self) -> str:
if not hasattr(self, "_phaser"):
self._phaser = itertools.cycle(self.phases)
return next(self._phaser)
def update(self) -> None:
message = self.message % self
phase = self.next_phase()
suffix = self.suffix % self
line = "".join(
[
message,
" " if message else "",
phase,
" " if suffix else "",
suffix,
]
)
self.writeln(line)
BAR_TYPES = {
"off": (DownloadSilentBar, DownloadSilentBar),
"on": (DefaultDownloadProgressBar, DownloadProgressSpinner),
"ascii": (DownloadBar, DownloadProgressSpinner),
"pretty": (DownloadFillingCirclesBar, DownloadProgressSpinner),
"emoji": (DownloadBlueEmojiProgressBar, DownloadProgressSpinner),
}
def DownloadProgressProvider(progress_bar, max=None): # type: ignore
if max is None or max == 0:
return BAR_TYPES[progress_bar][1]().iter
else:
return BAR_TYPES[progress_bar][0](max=max).iter
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