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svtplay-dl/lib/svtplay_dl/output.py

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2013-03-02 21:26:28 +01:00
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
from __future__ import absolute_import
import sys
import time
from datetime import timedelta
progress_stream = sys.stderr
class ETA(object):
"""
An ETA class, used to calculate how long it takes to process
an arbitrary set of items. By initiating the object with the
number of items and continuously updating with current
progress, the class can calculate an estimation of how long
time remains.
"""
def __init__(self, end, start=0):
"""
Parameters:
end: the end (or size, of start is 0)
start: the starting position, defaults to 0
"""
self.start = start
self.end = end
self.pos = start
self.now = time.time()
self.start_time = self.now
def update(self, pos):
"""
Set new absolute progress position.
Parameters:
pos: new absolute progress
"""
self.pos = pos
self.now = time.time()
def increment(self, skip=1):
"""
Like update, but set new pos relative to old pos.
Parameters:
skip: progress since last update (defaults to 1)
"""
self.update(self.pos + skip)
@property
def left(self):
"""
returns: How many item remains?
"""
return self.end - self.pos
def __str__(self):
"""
returns: a time string of the format HH:MM:SS.
"""
duration = self.now - self.start_time
# Calculate how long it takes to process one item
try:
elm_time = duration / (self.end - self.left)
except ZeroDivisionError:
return "(unknown)"
return str(timedelta(seconds=int(elm_time * self.left)))
def progress(byte, total, extra = ""):
""" Print some info about how much we have downloaded """
if total == 0:
progresstr = "Downloaded %dkB bytes" % (byte >> 10)
progress_stream.write(progresstr + '\r')
return
progressbar(total, byte, extra)
def progressbar(total, pos, msg=""):
"""
Given a total and a progress position, output a progress bar
to stderr. It is important to not output anything else while
using this, as it relies soley on the behavior of carriage
return (\\r).
Can also take an optioal message to add after the
progressbar. It must not contain newliens.
The progress bar will look something like this:
[099/500][=========...............................] ETA: 13:36:59
Of course, the ETA part should be supplied be the calling
function.
"""
width = 50 # TODO hardcoded progressbar width
rel_pos = int(float(pos)/total*width)
bar = ''.join(["=" * rel_pos, "." * (width - rel_pos)])
# Determine how many digits in total (base 10)
digits_total = len(str(total))
fmt_width = "%0" + str(digits_total) + "d"
fmt = "\r[" + fmt_width + "/" + fmt_width + "][%s] %s"
progress_stream.write(fmt % (pos, total, bar, msg))