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Minecraft-Overviewer/overviewer_core/progressbar.py
Nicolas F 715b3a2d43 progressbar: actually flush the fd on update 
A young software tinkerer from Switzerland noticed an issue with
an application he was working on one day. The progress bar it
was rendering only updated very rarely. This perplexed the teenager,
but never bugged him enough to investigate further. Nobody else seemed
to notice this, so maybe it was his system?

Fast forward a few years. The young man is now a 24 year old fully
grown manchild. The progress bar was still updating only very rarely.
On this rainy afternoon, the tinkerer had nothing else to do than
finally get to the bottom of this perplexing behaviour.

Much investigating was done. Did the Observer have a logic bug? No,
if we check in the update function by appending a line to a file,
we can see that it works properly. Besides, the logic of this piece
of code surely hasn't been changed for years.

Did maxvalue get set to 100 instead of the number of tiles? No, it
correctly overrode the right method to not just set max_value but
also maxvalue. (Great naming there, aheadley.)

Was it the polymorphic inheritance causing issues then? No, even the
parent class correctly behaved in its update function. Well, almost.
That is when the developer came upon a shocking revelation. His hands
trempled as his fingers moved across the laptop's keyboard, nearly
accidentally entering the "nuclear missile launch" mode in Kate's
Vi-Input editing. The developer added one line to the file.

self.fd.flush()

The progress bar finally worked as intended.
2019-03-01 14:36:28 +01:00

404 lines
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#!/usr/bin/python2
# -*- coding: iso-8859-1 -*-
#
# progressbar - Text progressbar 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
"""Text progressbar library for python.
This library provides a text mode progressbar. This is tipically used
to display the progress of a long running operation, providing a
visual clue that processing is underway.
The ProgressBar class manages the progress, and the format of the line
is given by a number of widgets. A widget is an object that may
display diferently depending on the state of the progress. There are
three types of widget:
- a string, which always shows itself;
- a ProgressBarWidget, which may return a diferent value every time
it's update method is called; and
- a ProgressBarWidgetHFill, which is like ProgressBarWidget, except it
expands to fill the remaining width of the line.
The progressbar module is very easy to use, yet very powerful. And
automatically supports features like auto-resizing when available.
"""
__author__ = "Nilton Volpato"
__author_email__ = "first-name dot last-name @ gmail.com"
__date__ = "2006-05-07"
__version__ = "2.2"
# Changelog
#
# 2006-05-07: v2.2 fixed bug in windows
# 2005-12-04: v2.1 autodetect terminal width, added start method
# 2005-12-04: v2.0 everything is now a widget (wow!)
# 2005-12-03: v1.0 rewrite using widgets
# 2005-06-02: v0.5 rewrite
# 2004-??-??: v0.1 first version
import sys, time
from array import array
try:
from fcntl import ioctl
import termios
except ImportError:
pass
import signal
class ProgressBarWidget(object):
"""This is an element of ProgressBar formatting.
The ProgressBar object will call it's update value when an update
is needed. It's size may change between call, but the results will
not be good if the size changes drastically and repeatedly.
"""
def update(self, pbar):
"""Returns the string representing the widget.
The parameter pbar is a reference to the calling ProgressBar,
where one can access attributes of the class for knowing how
the update must be made.
At least this function must be overriden."""
pass
class ProgressBarWidgetHFill(object):
"""This is a variable width element of ProgressBar formatting.
The ProgressBar object will call it's update value, informing the
width this object must the made. This is like TeX \\hfill, it will
expand to fill the line. You can use more than one in the same
line, and they will all have the same width, and together will
fill the line.
"""
def update(self, pbar, width):
"""Returns the string representing the widget.
The parameter pbar is a reference to the calling ProgressBar,
where one can access attributes of the class for knowing how
the update must be made. The parameter width is the total
horizontal width the widget must have.
At least this function must be overriden."""
pass
class ETA(ProgressBarWidget):
"Widget for the Estimated Time of Arrival"
def __init__(self, prefix='ETA: ', format=None):
self.prefix = prefix
if format:
self.format = format
else:
self.format = lambda seconds: '%02ih %02im %02is' % \
(seconds // 3600, (seconds % 3600) // 60, seconds % 60)
def update(self, pbar):
if pbar.finished:
return 'Time: ' + self.format(pbar.seconds_elapsed)
else:
if pbar.currval:
eta = pbar.seconds_elapsed * pbar.maxval / pbar.currval - pbar.seconds_elapsed
return self.prefix + self.format(eta)
else:
return self.prefix + '-' * 6
class GenericSpeed(ProgressBarWidget):
"Widget for showing the values/s"
def __init__(self, format='%6.2f ?/s'):
if callable(format):
self.format = format
else:
self.format = lambda speed: format % speed
def update(self, pbar):
if pbar.seconds_elapsed < 2e-6:
speed = 0.0
else:
speed = float(pbar.currval) / pbar.seconds_elapsed
return self.format(speed)
class FileTransferSpeed(ProgressBarWidget):
"Widget for showing the transfer speed (useful for file transfers)."
def __init__(self):
self.fmt = '%6.2f %s'
self.units = ['B','K','M','G','T','P']
def update(self, pbar):
if pbar.seconds_elapsed < 2e-6:#== 0:
bps = 0.0
else:
bps = float(pbar.currval) / pbar.seconds_elapsed
spd = bps
for u in self.units:
if spd < 1000:
break
spd /= 1000
return self.fmt % (spd, u+'/s')
class RotatingMarker(ProgressBarWidget):
"A rotating marker for filling the bar of progress."
def __init__(self, markers='|/-\\'):
self.markers = markers
self.curmark = -1
def update(self, pbar):
if pbar.finished:
return self.markers[0]
self.curmark = (self.curmark + 1)%len(self.markers)
return self.markers[self.curmark]
class Percentage(ProgressBarWidget):
"Just the percentage done."
def __init__(self, format='%3d%%'):
self.format = format
def update(self, pbar):
return self.format % pbar.percentage()
class CounterWidget(ProgressBarWidget):
"Simple display of (just) the current value"
def update(self, pbar):
return str(pbar.currval)
class FractionWidget(ProgressBarWidget):
def __init__(self, sep=' / '):
self.sep = sep
def update(self, pbar):
return '%2d%s%2d' % (pbar.currval, self.sep, pbar.maxval)
class Bar(ProgressBarWidgetHFill):
"The bar of progress. It will strech to fill the line."
def __init__(self, marker='#', left='|', right='|'):
self.marker = marker
self.left = left
self.right = right
def _format_marker(self, pbar):
if isinstance(self.marker, (str, unicode)):
return self.marker
else:
return self.marker.update(pbar)
def update(self, pbar, width):
percent = pbar.percentage()
cwidth = width - len(self.left) - len(self.right)
marked_width = int(percent * cwidth / 100)
m = self._format_marker(pbar)
bar = (self.left + (m*marked_width).ljust(cwidth) + self.right)
return bar
class ReverseBar(Bar):
"The reverse bar of progress, or bar of regress. :)"
def update(self, pbar, width):
percent = pbar.percentage()
cwidth = width - len(self.left) - len(self.right)
marked_width = int(percent * cwidth / 100)
m = self._format_marker(pbar)
bar = (self.left + (m*marked_width).rjust(cwidth) + self.right)
return bar
default_widgets = [Percentage(), ' ', Bar()]
class ProgressBar(object):
"""This is the ProgressBar class, it updates and prints the bar.
The term_width parameter may be an integer. Or None, in which case
it will try to guess it, if it fails it will default to 80 columns.
The simple use is like this:
>>> pbar = ProgressBar().start()
>>> for i in xrange(100):
... # do something
... pbar.update(i+1)
...
>>> pbar.finish()
But anything you want to do is possible (well, almost anything).
You can supply different widgets of any type in any order. And you
can even write your own widgets! There are many widgets already
shipped and you should experiment with them.
When implementing a widget update method you may access any
attribute or function of the ProgressBar object calling the
widget's update method. The most important attributes you would
like to access are:
- currval: current value of the progress, 0 <= currval <= maxval
- maxval: maximum (and final) value of the progress
- finished: True if the bar is have finished (reached 100%), False o/w
- start_time: first time update() method of ProgressBar was called
- seconds_elapsed: seconds elapsed since start_time
- percentage(): percentage of the progress (this is a method)
"""
def __init__(self, maxval=100, widgets=default_widgets, term_width=None,
fd=sys.stderr):
assert maxval > 0
self.maxval = maxval
self.widgets = widgets
self.fd = fd
self.signal_set = False
if term_width is None:
try:
self.handle_resize(None,None)
signal.signal(signal.SIGWINCH, self.handle_resize)
signal.siginterrupt(signal.SIGWINCH, False)
self.signal_set = True
except:
self.term_width = 79
else:
self.term_width = term_width
self.currval = 0
self.finished = False
self.start_time = None
self.seconds_elapsed = 0
def handle_resize(self, signum, frame):
h,w=array('h', ioctl(self.fd,termios.TIOCGWINSZ,'\0'*8))[:2]
self.term_width = w
def percentage(self):
"Returns the percentage of the progress."
return self.currval*100.0 / self.maxval
def _format_widgets(self):
r = []
hfill_inds = []
num_hfill = 0
currwidth = 0
for i, w in enumerate(self.widgets):
if isinstance(w, ProgressBarWidgetHFill):
r.append(w)
hfill_inds.append(i)
num_hfill += 1
elif isinstance(w, (str, unicode)):
r.append(w)
currwidth += len(w)
else:
weval = w.update(self)
currwidth += len(weval)
r.append(weval)
for iw in hfill_inds:
r[iw] = r[iw].update(self, (self.term_width-currwidth)/num_hfill)
return r
def _format_line(self):
return ''.join(self._format_widgets()).ljust(self.term_width)
def _need_update(self):
return True
def update(self, value):
"Updates the progress bar to a new value."
assert 0 <= value <= self.maxval
self.currval = value
if not self._need_update() or self.finished:
return False
if not self.start_time:
self.start_time = time.time()
self.seconds_elapsed = time.time() - self.start_time
if value != self.maxval:
self.fd.write(self._format_line() + '\r')
else:
self.finished = True
self.fd.write(self._format_line() + '\n')
self.fd.flush()
return True
def start(self):
"""Start measuring time, and prints the bar at 0%.
It returns self so you can use it like this:
>>> pbar = ProgressBar().start()
>>> for i in xrange(100):
... # do something
... pbar.update(i+1)
...
>>> pbar.finish()
"""
self.update(0)
return self
def finish(self):
"""Used to tell the progress is finished."""
self.update(self.maxval)
if self.signal_set:
signal.signal(signal.SIGWINCH, signal.SIG_DFL)
if __name__=='__main__':
import os
def example1():
widgets = ['Test: ', Percentage(), ' ', Bar(marker=RotatingMarker()),
' ', ETA(), ' ', FileTransferSpeed()]
pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
for i in range(1000000):
# do something
pbar.update(10*i+1)
pbar.finish()
print
def example2():
class CrazyFileTransferSpeed(FileTransferSpeed):
"It's bigger between 45 and 80 percent"
def update(self, pbar):
if 45 < pbar.percentage() < 80:
return 'Bigger Now ' + FileTransferSpeed.update(self,pbar)
else:
return FileTransferSpeed.update(self,pbar)
widgets = [CrazyFileTransferSpeed(),' <<<', Bar(), '>>> ', Percentage(),' ', ETA()]
pbar = ProgressBar(widgets=widgets, maxval=10000000)
# maybe do something
pbar.start()
for i in range(2000000):
# do something
pbar.update(5*i+1)
pbar.finish()
print
def example3():
widgets = [Bar('>'), ' ', ETA(), ' ', ReverseBar('<')]
pbar = ProgressBar(widgets=widgets, maxval=10000000).start()
for i in range(1000000):
# do something
pbar.update(10*i+1)
pbar.finish()
print
def example4():
widgets = ['Test: ', Percentage(), ' ',
Bar(marker='0',left='[',right=']'),
' ', ETA(), ' ', FileTransferSpeed()]
pbar = ProgressBar(widgets=widgets, maxval=500)
pbar.start()
for i in range(100,500+1,50):
time.sleep(0.2)
pbar.update(i)
pbar.finish()
print
example1()
example2()
example3()
example4()
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