mirror of
https://github.com/mbusb/multibootusb
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307 lines
9.3 KiB
Python
307 lines
9.3 KiB
Python
# -*- coding: utf-8 -*-
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#
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# progressbar - Text progress bar library for Python.
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# Copyright (c) 2005 Nilton Volpato
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""Main ProgressBar class."""
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from __future__ import division
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import math
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import os
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import signal
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import sys
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import time
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try:
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from fcntl import ioctl
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from array import array
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import termios
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except ImportError:
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pass
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from .compat import * # for: any, next
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from . import widgets
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class UnknownLength: pass
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class ProgressBar(object):
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"""The ProgressBar class which updates and prints the bar.
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A common way of using it is like:
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>>> pbar = ProgressBar().start()
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>>> for i in range(100):
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... # do something
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... pbar.update(i+1)
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...
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>>> pbar.finish()
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You can also use a ProgressBar as an iterator:
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>>> progress = ProgressBar()
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>>> for i in progress(some_iterable):
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... # do something
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...
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Since the progress bar is incredibly customizable you can specify
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different widgets of any type in any order. You can even write your own
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widgets! However, since there are already a good number of widgets you
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should probably play around with them before moving on to create your own
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widgets.
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The term_width parameter represents the current terminal width. If the
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parameter is set to an integer then the progress bar will use that,
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otherwise it will attempt to determine the terminal width falling back to
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80 columns if the width cannot be determined.
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When implementing a widget's update method you are passed a reference to
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the current progress bar. As a result, you have access to the
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ProgressBar's methods and attributes. Although there is nothing preventing
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you from changing the ProgressBar you should treat it as read only.
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Useful methods and attributes include (Public API):
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- currval: current progress (0 <= currval <= maxval)
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- maxval: maximum (and final) value
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- finished: True if the bar has finished (reached 100%)
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- start_time: the time when start() method of ProgressBar was called
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- seconds_elapsed: seconds elapsed since start_time and last call to
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update
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- percentage(): progress in percent [0..100]
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"""
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__slots__ = ('currval', 'fd', 'finished', 'last_update_time',
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'left_justify', 'maxval', 'next_update', 'num_intervals',
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'poll', 'seconds_elapsed', 'signal_set', 'start_time',
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'term_width', 'update_interval', 'widgets', '_time_sensitive',
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'__iterable')
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_DEFAULT_MAXVAL = 100
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_DEFAULT_TERMSIZE = 80
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_DEFAULT_WIDGETS = [widgets.Percentage(), ' ', widgets.Bar()]
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def __init__(self, maxval=None, widgets=None, term_width=None, poll=1,
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left_justify=True, fd=sys.stderr):
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"""Initializes a progress bar with sane defaults."""
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# Don't share a reference with any other progress bars
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if widgets is None:
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widgets = list(self._DEFAULT_WIDGETS)
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self.maxval = maxval
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self.widgets = widgets
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self.fd = fd
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self.left_justify = left_justify
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self.signal_set = False
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if term_width is not None:
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self.term_width = term_width
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else:
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try:
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self._handle_resize()
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signal.signal(signal.SIGWINCH, self._handle_resize)
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self.signal_set = True
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except (SystemExit, KeyboardInterrupt): raise
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except:
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self.term_width = self._env_size()
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self.__iterable = None
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self._update_widgets()
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self.currval = 0
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self.finished = False
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self.last_update_time = None
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self.poll = poll
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self.seconds_elapsed = 0
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self.start_time = None
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self.update_interval = 1
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self.next_update = 0
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def __call__(self, iterable):
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"""Use a ProgressBar to iterate through an iterable."""
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try:
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self.maxval = len(iterable)
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except:
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if self.maxval is None:
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self.maxval = UnknownLength
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self.__iterable = iter(iterable)
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return self
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def __iter__(self):
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return self
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def __next__(self):
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try:
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value = next(self.__iterable)
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if self.start_time is None:
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self.start()
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else:
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self.update(self.currval + 1)
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return value
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except StopIteration:
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if self.start_time is None:
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self.start()
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self.finish()
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raise
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# Create an alias so that Python 2.x won't complain about not being
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# an iterator.
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next = __next__
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def _env_size(self):
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"""Tries to find the term_width from the environment."""
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return int(os.environ.get('COLUMNS', self._DEFAULT_TERMSIZE)) - 1
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def _handle_resize(self, signum=None, frame=None):
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"""Tries to catch resize signals sent from the terminal."""
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h, w = array('h', ioctl(self.fd, termios.TIOCGWINSZ, '\0' * 8))[:2]
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self.term_width = w
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def percentage(self):
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"""Returns the progress as a percentage."""
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if self.currval >= self.maxval:
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return 100.0
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return (self.currval * 100.0 / self.maxval) if self.maxval else 100.00
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percent = property(percentage)
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def _format_widgets(self):
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result = []
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expanding = []
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width = self.term_width
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for index, widget in enumerate(self.widgets):
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if isinstance(widget, widgets.WidgetHFill):
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result.append(widget)
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expanding.insert(0, index)
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else:
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widget = widgets.format_updatable(widget, self)
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result.append(widget)
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width -= len(widget)
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count = len(expanding)
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while count:
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portion = max(int(math.ceil(width * 1. / count)), 0)
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index = expanding.pop()
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count -= 1
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widget = result[index].update(self, portion)
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width -= len(widget)
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result[index] = widget
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return result
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def _format_line(self):
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"""Joins the widgets and justifies the line."""
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widgets = ''.join(self._format_widgets())
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if self.left_justify: return widgets.ljust(self.term_width)
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else: return widgets.rjust(self.term_width)
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def _need_update(self):
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"""Returns whether the ProgressBar should redraw the line."""
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if self.currval >= self.next_update or self.finished: return True
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delta = time.time() - self.last_update_time
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return self._time_sensitive and delta > self.poll
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def _update_widgets(self):
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"""Checks all widgets for the time sensitive bit."""
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self._time_sensitive = any(getattr(w, 'TIME_SENSITIVE', False)
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for w in self.widgets)
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def update(self, value=None):
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"""Updates the ProgressBar to a new value."""
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if value is not None and value is not UnknownLength:
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if (self.maxval is not UnknownLength
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and not 0 <= value <= self.maxval):
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raise ValueError('Value out of range')
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self.currval = value
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if not self._need_update(): return
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if self.start_time is None:
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raise RuntimeError('You must call "start" before calling "update"')
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now = time.time()
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self.seconds_elapsed = now - self.start_time
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self.next_update = self.currval + self.update_interval
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self.fd.write(self._format_line() + '\r')
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self.fd.flush()
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self.last_update_time = now
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def start(self):
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"""Starts measuring time, and prints the bar at 0%.
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It returns self so you can use it like this:
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>>> pbar = ProgressBar().start()
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>>> for i in range(100):
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... # do something
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... pbar.update(i+1)
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...
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>>> pbar.finish()
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"""
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if self.maxval is None:
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self.maxval = self._DEFAULT_MAXVAL
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self.num_intervals = max(100, self.term_width)
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self.next_update = 0
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if self.maxval is not UnknownLength:
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if self.maxval < 0: raise ValueError('Value out of range')
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self.update_interval = self.maxval / self.num_intervals
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self.start_time = self.last_update_time = time.time()
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self.update(0)
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return self
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def finish(self):
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"""Puts the ProgressBar bar in the finished state."""
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if self.finished:
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return
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self.finished = True
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self.update(self.maxval)
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self.fd.write('\n')
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if self.signal_set:
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signal.signal(signal.SIGWINCH, signal.SIG_DFL)
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