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109 lines
3.0 KiB
Python
109 lines
3.0 KiB
Python
# ex:ts=4:sw=4:sts=4:et
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# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
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from __future__ import absolute_import
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import sys
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import time
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from datetime import timedelta
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progress_stream = sys.stderr
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class ETA(object):
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"""
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An ETA class, used to calculate how long it takes to process
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an arbitrary set of items. By initiating the object with the
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number of items and continuously updating with current
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progress, the class can calculate an estimation of how long
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time remains.
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"""
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def __init__(self, end, start=0):
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"""
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Parameters:
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end: the end (or size, of start is 0)
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start: the starting position, defaults to 0
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"""
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self.start = start
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self.end = end
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self.pos = start
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self.now = time.time()
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self.start_time = self.now
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def update(self, pos):
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"""
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Set new absolute progress position.
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Parameters:
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pos: new absolute progress
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"""
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self.pos = pos
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self.now = time.time()
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def increment(self, skip=1):
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"""
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Like update, but set new pos relative to old pos.
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Parameters:
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skip: progress since last update (defaults to 1)
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"""
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self.update(self.pos + skip)
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@property
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def left(self):
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"""
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returns: How many item remains?
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"""
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return self.end - self.pos
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def __str__(self):
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"""
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returns: a time string of the format HH:MM:SS.
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"""
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duration = self.now - self.start_time
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# Calculate how long it takes to process one item
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try:
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elm_time = duration / (self.end - self.left)
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except ZeroDivisionError:
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return "(unknown)"
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return str(timedelta(seconds=int(elm_time * self.left)))
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def progress(byte, total, extra = ""):
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""" Print some info about how much we have downloaded """
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if total == 0:
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progresstr = "Downloaded %dkB bytes" % (byte >> 10)
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progress_stream.write(progresstr + '\r')
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return
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progressbar(total, byte, extra)
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def progressbar(total, pos, msg=""):
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"""
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Given a total and a progress position, output a progress bar
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to stderr. It is important to not output anything else while
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using this, as it relies soley on the behavior of carriage
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return (\\r).
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Can also take an optioal message to add after the
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progressbar. It must not contain newliens.
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The progress bar will look something like this:
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[099/500][=========...............................] ETA: 13:36:59
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Of course, the ETA part should be supplied be the calling
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function.
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"""
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width = 50 # TODO hardcoded progressbar width
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rel_pos = int(float(pos)/total*width)
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bar = ''.join(["=" * rel_pos, "." * (width - rel_pos)])
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# Determine how many digits in total (base 10)
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digits_total = len(str(total))
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fmt_width = "%0" + str(digits_total) + "d"
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fmt = "\r[" + fmt_width + "/" + fmt_width + "][%s] %s"
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progress_stream.write(fmt % (pos, total, bar, msg))
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