718 lines
23 KiB
Python
718 lines
23 KiB
Python
"""
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This module contains implementations for the termui module. To keep the
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import time of Click down, some infrequently used functionality is
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placed in this module and only imported as needed.
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"""
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import contextlib
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import math
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import os
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import sys
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import time
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import typing as t
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from gettext import gettext as _
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from ._compat import _default_text_stdout
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from ._compat import CYGWIN
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from ._compat import get_best_encoding
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from ._compat import isatty
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from ._compat import open_stream
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from ._compat import strip_ansi
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from ._compat import term_len
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from ._compat import WIN
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from .exceptions import ClickException
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from .utils import echo
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V = t.TypeVar("V")
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if os.name == "nt":
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BEFORE_BAR = "\r"
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AFTER_BAR = "\n"
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else:
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BEFORE_BAR = "\r\033[?25l"
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AFTER_BAR = "\033[?25h\n"
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class ProgressBar(t.Generic[V]):
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def __init__(
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self,
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iterable: t.Optional[t.Iterable[V]],
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length: t.Optional[int] = None,
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fill_char: str = "#",
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empty_char: str = " ",
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bar_template: str = "%(bar)s",
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info_sep: str = " ",
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show_eta: bool = True,
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show_percent: t.Optional[bool] = None,
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show_pos: bool = False,
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item_show_func: t.Optional[t.Callable[[t.Optional[V]], t.Optional[str]]] = None,
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label: t.Optional[str] = None,
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file: t.Optional[t.TextIO] = None,
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color: t.Optional[bool] = None,
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update_min_steps: int = 1,
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width: int = 30,
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) -> None:
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self.fill_char = fill_char
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self.empty_char = empty_char
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self.bar_template = bar_template
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self.info_sep = info_sep
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self.show_eta = show_eta
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self.show_percent = show_percent
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self.show_pos = show_pos
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self.item_show_func = item_show_func
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self.label = label or ""
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if file is None:
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file = _default_text_stdout()
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self.file = file
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self.color = color
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self.update_min_steps = update_min_steps
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self._completed_intervals = 0
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self.width = width
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self.autowidth = width == 0
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if length is None:
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from operator import length_hint
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length = length_hint(iterable, -1)
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if length == -1:
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length = None
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if iterable is None:
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if length is None:
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raise TypeError("iterable or length is required")
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iterable = t.cast(t.Iterable[V], range(length))
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self.iter = iter(iterable)
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self.length = length
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self.pos = 0
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self.avg: t.List[float] = []
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self.start = self.last_eta = time.time()
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self.eta_known = False
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self.finished = False
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self.max_width: t.Optional[int] = None
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self.entered = False
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self.current_item: t.Optional[V] = None
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self.is_hidden = not isatty(self.file)
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self._last_line: t.Optional[str] = None
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def __enter__(self) -> "ProgressBar":
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self.entered = True
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self.render_progress()
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return self
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def __exit__(self, exc_type, exc_value, tb): # type: ignore
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self.render_finish()
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def __iter__(self) -> t.Iterator[V]:
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if not self.entered:
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raise RuntimeError("You need to use progress bars in a with block.")
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self.render_progress()
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return self.generator()
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def __next__(self) -> V:
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# Iteration is defined in terms of a generator function,
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# returned by iter(self); use that to define next(). This works
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# because `self.iter` is an iterable consumed by that generator,
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# so it is re-entry safe. Calling `next(self.generator())`
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# twice works and does "what you want".
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return next(iter(self))
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def render_finish(self) -> None:
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if self.is_hidden:
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return
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self.file.write(AFTER_BAR)
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self.file.flush()
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@property
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def pct(self) -> float:
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if self.finished:
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return 1.0
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return min(self.pos / (float(self.length or 1) or 1), 1.0)
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@property
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def time_per_iteration(self) -> float:
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if not self.avg:
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return 0.0
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return sum(self.avg) / float(len(self.avg))
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@property
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def eta(self) -> float:
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if self.length is not None and not self.finished:
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return self.time_per_iteration * (self.length - self.pos)
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return 0.0
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def format_eta(self) -> str:
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if self.eta_known:
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t = int(self.eta)
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seconds = t % 60
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t //= 60
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minutes = t % 60
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t //= 60
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hours = t % 24
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t //= 24
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if t > 0:
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return f"{t}d {hours:02}:{minutes:02}:{seconds:02}"
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else:
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return f"{hours:02}:{minutes:02}:{seconds:02}"
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return ""
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def format_pos(self) -> str:
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pos = str(self.pos)
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if self.length is not None:
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pos += f"/{self.length}"
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return pos
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def format_pct(self) -> str:
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return f"{int(self.pct * 100): 4}%"[1:]
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def format_bar(self) -> str:
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if self.length is not None:
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bar_length = int(self.pct * self.width)
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bar = self.fill_char * bar_length
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bar += self.empty_char * (self.width - bar_length)
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elif self.finished:
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bar = self.fill_char * self.width
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else:
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chars = list(self.empty_char * (self.width or 1))
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if self.time_per_iteration != 0:
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chars[
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int(
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(math.cos(self.pos * self.time_per_iteration) / 2.0 + 0.5)
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* self.width
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)
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] = self.fill_char
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bar = "".join(chars)
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return bar
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def format_progress_line(self) -> str:
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show_percent = self.show_percent
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info_bits = []
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if self.length is not None and show_percent is None:
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show_percent = not self.show_pos
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if self.show_pos:
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info_bits.append(self.format_pos())
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if show_percent:
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info_bits.append(self.format_pct())
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if self.show_eta and self.eta_known and not self.finished:
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info_bits.append(self.format_eta())
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if self.item_show_func is not None:
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item_info = self.item_show_func(self.current_item)
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if item_info is not None:
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info_bits.append(item_info)
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return (
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self.bar_template
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% {
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"label": self.label,
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"bar": self.format_bar(),
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"info": self.info_sep.join(info_bits),
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}
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).rstrip()
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def render_progress(self) -> None:
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import shutil
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if self.is_hidden:
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# Only output the label as it changes if the output is not a
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# TTY. Use file=stderr if you expect to be piping stdout.
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if self._last_line != self.label:
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self._last_line = self.label
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echo(self.label, file=self.file, color=self.color)
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return
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buf = []
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# Update width in case the terminal has been resized
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if self.autowidth:
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old_width = self.width
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self.width = 0
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clutter_length = term_len(self.format_progress_line())
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new_width = max(0, shutil.get_terminal_size().columns - clutter_length)
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if new_width < old_width:
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buf.append(BEFORE_BAR)
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buf.append(" " * self.max_width) # type: ignore
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self.max_width = new_width
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self.width = new_width
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clear_width = self.width
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if self.max_width is not None:
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clear_width = self.max_width
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buf.append(BEFORE_BAR)
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line = self.format_progress_line()
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line_len = term_len(line)
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if self.max_width is None or self.max_width < line_len:
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self.max_width = line_len
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buf.append(line)
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buf.append(" " * (clear_width - line_len))
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line = "".join(buf)
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# Render the line only if it changed.
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if line != self._last_line:
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self._last_line = line
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echo(line, file=self.file, color=self.color, nl=False)
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self.file.flush()
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def make_step(self, n_steps: int) -> None:
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self.pos += n_steps
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if self.length is not None and self.pos >= self.length:
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self.finished = True
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if (time.time() - self.last_eta) < 1.0:
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return
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self.last_eta = time.time()
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# self.avg is a rolling list of length <= 7 of steps where steps are
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# defined as time elapsed divided by the total progress through
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# self.length.
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if self.pos:
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step = (time.time() - self.start) / self.pos
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else:
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step = time.time() - self.start
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self.avg = self.avg[-6:] + [step]
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self.eta_known = self.length is not None
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def update(self, n_steps: int, current_item: t.Optional[V] = None) -> None:
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"""Update the progress bar by advancing a specified number of
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steps, and optionally set the ``current_item`` for this new
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position.
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:param n_steps: Number of steps to advance.
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:param current_item: Optional item to set as ``current_item``
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for the updated position.
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.. versionchanged:: 8.0
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Added the ``current_item`` optional parameter.
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.. versionchanged:: 8.0
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Only render when the number of steps meets the
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``update_min_steps`` threshold.
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"""
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if current_item is not None:
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self.current_item = current_item
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self._completed_intervals += n_steps
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if self._completed_intervals >= self.update_min_steps:
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self.make_step(self._completed_intervals)
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self.render_progress()
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self._completed_intervals = 0
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def finish(self) -> None:
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self.eta_known = False
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self.current_item = None
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self.finished = True
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def generator(self) -> t.Iterator[V]:
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"""Return a generator which yields the items added to the bar
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during construction, and updates the progress bar *after* the
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yielded block returns.
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"""
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# WARNING: the iterator interface for `ProgressBar` relies on
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# this and only works because this is a simple generator which
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# doesn't create or manage additional state. If this function
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# changes, the impact should be evaluated both against
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# `iter(bar)` and `next(bar)`. `next()` in particular may call
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# `self.generator()` repeatedly, and this must remain safe in
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# order for that interface to work.
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if not self.entered:
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raise RuntimeError("You need to use progress bars in a with block.")
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if self.is_hidden:
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yield from self.iter
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else:
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for rv in self.iter:
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self.current_item = rv
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# This allows show_item_func to be updated before the
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# item is processed. Only trigger at the beginning of
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# the update interval.
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if self._completed_intervals == 0:
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self.render_progress()
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yield rv
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self.update(1)
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self.finish()
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self.render_progress()
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def pager(generator: t.Iterable[str], color: t.Optional[bool] = None) -> None:
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"""Decide what method to use for paging through text."""
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stdout = _default_text_stdout()
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if not isatty(sys.stdin) or not isatty(stdout):
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return _nullpager(stdout, generator, color)
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pager_cmd = (os.environ.get("PAGER", None) or "").strip()
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if pager_cmd:
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if WIN:
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return _tempfilepager(generator, pager_cmd, color)
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return _pipepager(generator, pager_cmd, color)
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if os.environ.get("TERM") in ("dumb", "emacs"):
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return _nullpager(stdout, generator, color)
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if WIN or sys.platform.startswith("os2"):
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return _tempfilepager(generator, "more <", color)
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if hasattr(os, "system") and os.system("(less) 2>/dev/null") == 0:
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return _pipepager(generator, "less", color)
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import tempfile
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fd, filename = tempfile.mkstemp()
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os.close(fd)
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try:
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if hasattr(os, "system") and os.system(f'more "{filename}"') == 0:
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return _pipepager(generator, "more", color)
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return _nullpager(stdout, generator, color)
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finally:
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os.unlink(filename)
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def _pipepager(generator: t.Iterable[str], cmd: str, color: t.Optional[bool]) -> None:
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"""Page through text by feeding it to another program. Invoking a
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pager through this might support colors.
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"""
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import subprocess
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env = dict(os.environ)
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# If we're piping to less we might support colors under the
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# condition that
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cmd_detail = cmd.rsplit("/", 1)[-1].split()
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if color is None and cmd_detail[0] == "less":
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less_flags = f"{os.environ.get('LESS', '')}{' '.join(cmd_detail[1:])}"
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if not less_flags:
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env["LESS"] = "-R"
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color = True
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elif "r" in less_flags or "R" in less_flags:
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color = True
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c = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, env=env)
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stdin = t.cast(t.BinaryIO, c.stdin)
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encoding = get_best_encoding(stdin)
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try:
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for text in generator:
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if not color:
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text = strip_ansi(text)
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stdin.write(text.encode(encoding, "replace"))
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except (OSError, KeyboardInterrupt):
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pass
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else:
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stdin.close()
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# Less doesn't respect ^C, but catches it for its own UI purposes (aborting
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# search or other commands inside less).
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#
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# That means when the user hits ^C, the parent process (click) terminates,
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# but less is still alive, paging the output and messing up the terminal.
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#
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# If the user wants to make the pager exit on ^C, they should set
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# `LESS='-K'`. It's not our decision to make.
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while True:
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try:
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c.wait()
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except KeyboardInterrupt:
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pass
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else:
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break
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def _tempfilepager(
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generator: t.Iterable[str], cmd: str, color: t.Optional[bool]
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) -> None:
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"""Page through text by invoking a program on a temporary file."""
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import tempfile
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_, filename = tempfile.mkstemp()
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# TODO: This never terminates if the passed generator never terminates.
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text = "".join(generator)
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if not color:
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text = strip_ansi(text)
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encoding = get_best_encoding(sys.stdout)
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with open_stream(filename, "wb")[0] as f:
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f.write(text.encode(encoding))
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try:
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os.system(f'{cmd} "{filename}"')
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finally:
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os.unlink(filename)
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def _nullpager(
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stream: t.TextIO, generator: t.Iterable[str], color: t.Optional[bool]
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) -> None:
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"""Simply print unformatted text. This is the ultimate fallback."""
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for text in generator:
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if not color:
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text = strip_ansi(text)
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stream.write(text)
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class Editor:
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def __init__(
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self,
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editor: t.Optional[str] = None,
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env: t.Optional[t.Mapping[str, str]] = None,
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require_save: bool = True,
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extension: str = ".txt",
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) -> None:
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self.editor = editor
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self.env = env
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self.require_save = require_save
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self.extension = extension
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def get_editor(self) -> str:
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if self.editor is not None:
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return self.editor
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for key in "VISUAL", "EDITOR":
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rv = os.environ.get(key)
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if rv:
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return rv
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if WIN:
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return "notepad"
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for editor in "sensible-editor", "vim", "nano":
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if os.system(f"which {editor} >/dev/null 2>&1") == 0:
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return editor
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return "vi"
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def edit_file(self, filename: str) -> None:
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import subprocess
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editor = self.get_editor()
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environ: t.Optional[t.Dict[str, str]] = None
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if self.env:
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environ = os.environ.copy()
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environ.update(self.env)
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try:
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c = subprocess.Popen(f'{editor} "{filename}"', env=environ, shell=True)
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exit_code = c.wait()
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if exit_code != 0:
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raise ClickException(
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_("{editor}: Editing failed").format(editor=editor)
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)
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except OSError as e:
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raise ClickException(
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_("{editor}: Editing failed: {e}").format(editor=editor, e=e)
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)
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def edit(self, text: t.Optional[t.AnyStr]) -> t.Optional[t.AnyStr]:
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import tempfile
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if not text:
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data = b""
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elif isinstance(text, (bytes, bytearray)):
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data = text
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else:
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if text and not text.endswith("\n"):
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text += "\n"
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if WIN:
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data = text.replace("\n", "\r\n").encode("utf-8-sig")
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else:
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data = text.encode("utf-8")
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fd, name = tempfile.mkstemp(prefix="editor-", suffix=self.extension)
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f: t.BinaryIO
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try:
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with os.fdopen(fd, "wb") as f:
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f.write(data)
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# If the filesystem resolution is 1 second, like Mac OS
|
|
# 10.12 Extended, or 2 seconds, like FAT32, and the editor
|
|
# closes very fast, require_save can fail. Set the modified
|
|
# time to be 2 seconds in the past to work around this.
|
|
os.utime(name, (os.path.getatime(name), os.path.getmtime(name) - 2))
|
|
# Depending on the resolution, the exact value might not be
|
|
# recorded, so get the new recorded value.
|
|
timestamp = os.path.getmtime(name)
|
|
|
|
self.edit_file(name)
|
|
|
|
if self.require_save and os.path.getmtime(name) == timestamp:
|
|
return None
|
|
|
|
with open(name, "rb") as f:
|
|
rv = f.read()
|
|
|
|
if isinstance(text, (bytes, bytearray)):
|
|
return rv
|
|
|
|
return rv.decode("utf-8-sig").replace("\r\n", "\n") # type: ignore
|
|
finally:
|
|
os.unlink(name)
|
|
|
|
|
|
def open_url(url: str, wait: bool = False, locate: bool = False) -> int:
|
|
import subprocess
|
|
|
|
def _unquote_file(url: str) -> str:
|
|
from urllib.parse import unquote
|
|
|
|
if url.startswith("file://"):
|
|
url = unquote(url[7:])
|
|
|
|
return url
|
|
|
|
if sys.platform == "darwin":
|
|
args = ["open"]
|
|
if wait:
|
|
args.append("-W")
|
|
if locate:
|
|
args.append("-R")
|
|
args.append(_unquote_file(url))
|
|
null = open("/dev/null", "w")
|
|
try:
|
|
return subprocess.Popen(args, stderr=null).wait()
|
|
finally:
|
|
null.close()
|
|
elif WIN:
|
|
if locate:
|
|
url = _unquote_file(url.replace('"', ""))
|
|
args = f'explorer /select,"{url}"'
|
|
else:
|
|
url = url.replace('"', "")
|
|
wait_str = "/WAIT" if wait else ""
|
|
args = f'start {wait_str} "" "{url}"'
|
|
return os.system(args)
|
|
elif CYGWIN:
|
|
if locate:
|
|
url = os.path.dirname(_unquote_file(url).replace('"', ""))
|
|
args = f'cygstart "{url}"'
|
|
else:
|
|
url = url.replace('"', "")
|
|
wait_str = "-w" if wait else ""
|
|
args = f'cygstart {wait_str} "{url}"'
|
|
return os.system(args)
|
|
|
|
try:
|
|
if locate:
|
|
url = os.path.dirname(_unquote_file(url)) or "."
|
|
else:
|
|
url = _unquote_file(url)
|
|
c = subprocess.Popen(["xdg-open", url])
|
|
if wait:
|
|
return c.wait()
|
|
return 0
|
|
except OSError:
|
|
if url.startswith(("http://", "https://")) and not locate and not wait:
|
|
import webbrowser
|
|
|
|
webbrowser.open(url)
|
|
return 0
|
|
return 1
|
|
|
|
|
|
def _translate_ch_to_exc(ch: str) -> t.Optional[BaseException]:
|
|
if ch == "\x03":
|
|
raise KeyboardInterrupt()
|
|
|
|
if ch == "\x04" and not WIN: # Unix-like, Ctrl+D
|
|
raise EOFError()
|
|
|
|
if ch == "\x1a" and WIN: # Windows, Ctrl+Z
|
|
raise EOFError()
|
|
|
|
return None
|
|
|
|
|
|
if WIN:
|
|
import msvcrt
|
|
|
|
@contextlib.contextmanager
|
|
def raw_terminal() -> t.Iterator[int]:
|
|
yield -1
|
|
|
|
def getchar(echo: bool) -> str:
|
|
# The function `getch` will return a bytes object corresponding to
|
|
# the pressed character. Since Windows 10 build 1803, it will also
|
|
# return \x00 when called a second time after pressing a regular key.
|
|
#
|
|
# `getwch` does not share this probably-bugged behavior. Moreover, it
|
|
# returns a Unicode object by default, which is what we want.
|
|
#
|
|
# Either of these functions will return \x00 or \xe0 to indicate
|
|
# a special key, and you need to call the same function again to get
|
|
# the "rest" of the code. The fun part is that \u00e0 is
|
|
# "latin small letter a with grave", so if you type that on a French
|
|
# keyboard, you _also_ get a \xe0.
|
|
# E.g., consider the Up arrow. This returns \xe0 and then \x48. The
|
|
# resulting Unicode string reads as "a with grave" + "capital H".
|
|
# This is indistinguishable from when the user actually types
|
|
# "a with grave" and then "capital H".
|
|
#
|
|
# When \xe0 is returned, we assume it's part of a special-key sequence
|
|
# and call `getwch` again, but that means that when the user types
|
|
# the \u00e0 character, `getchar` doesn't return until a second
|
|
# character is typed.
|
|
# The alternative is returning immediately, but that would mess up
|
|
# cross-platform handling of arrow keys and others that start with
|
|
# \xe0. Another option is using `getch`, but then we can't reliably
|
|
# read non-ASCII characters, because return values of `getch` are
|
|
# limited to the current 8-bit codepage.
|
|
#
|
|
# Anyway, Click doesn't claim to do this Right(tm), and using `getwch`
|
|
# is doing the right thing in more situations than with `getch`.
|
|
func: t.Callable[[], str]
|
|
|
|
if echo:
|
|
func = msvcrt.getwche # type: ignore
|
|
else:
|
|
func = msvcrt.getwch # type: ignore
|
|
|
|
rv = func()
|
|
|
|
if rv in ("\x00", "\xe0"):
|
|
# \x00 and \xe0 are control characters that indicate special key,
|
|
# see above.
|
|
rv += func()
|
|
|
|
_translate_ch_to_exc(rv)
|
|
return rv
|
|
|
|
|
|
else:
|
|
import tty
|
|
import termios
|
|
|
|
@contextlib.contextmanager
|
|
def raw_terminal() -> t.Iterator[int]:
|
|
f: t.Optional[t.TextIO]
|
|
fd: int
|
|
|
|
if not isatty(sys.stdin):
|
|
f = open("/dev/tty")
|
|
fd = f.fileno()
|
|
else:
|
|
fd = sys.stdin.fileno()
|
|
f = None
|
|
|
|
try:
|
|
old_settings = termios.tcgetattr(fd)
|
|
|
|
try:
|
|
tty.setraw(fd)
|
|
yield fd
|
|
finally:
|
|
termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
|
|
sys.stdout.flush()
|
|
|
|
if f is not None:
|
|
f.close()
|
|
except termios.error:
|
|
pass
|
|
|
|
def getchar(echo: bool) -> str:
|
|
with raw_terminal() as fd:
|
|
ch = os.read(fd, 32).decode(get_best_encoding(sys.stdin), "replace")
|
|
|
|
if echo and isatty(sys.stdout):
|
|
sys.stdout.write(ch)
|
|
|
|
_translate_ch_to_exc(ch)
|
|
return ch
|