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