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# Copyright (c) 2012 Georgios Verigakis <verigak@gmail.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
from __future__ import division, print_function
from collections import deque
from datetime import timedelta
from math import ceil
from sys import stderr
try:
from time import monotonic
except ImportError:
from time import time as monotonic
__version__ = '1.6'
HIDE_CURSOR = '\x1b[?25l'
SHOW_CURSOR = '\x1b[?25h'
class Infinite(object):
file = stderr
sma_window = 10 # Simple Moving Average window
check_tty = True
hide_cursor = True
def __init__(self, message='', **kwargs):
self.index = 0
self.start_ts = monotonic()
self.avg = 0
self._avg_update_ts = self.start_ts
self._ts = self.start_ts
self._xput = deque(maxlen=self.sma_window)
for key, val in kwargs.items():
setattr(self, key, val)
self._max_width = 0
self._hidden_cursor = False
self.message = message
if self.file and self.is_tty():
if self.hide_cursor:
print(HIDE_CURSOR, end='', file=self.file)
self._hidden_cursor = True
self.writeln('')
def __del__(self):
if self._hidden_cursor:
print(SHOW_CURSOR, end='', file=self.file)
def __getitem__(self, key):
if key.startswith('_'):
return None
return getattr(self, key, None)
@property
def elapsed(self):
return int(monotonic() - self.start_ts)
@property
def elapsed_td(self):
return timedelta(seconds=self.elapsed)
def update_avg(self, n, dt):
if n > 0:
xput_len = len(self._xput)
self._xput.append(dt / n)
now = monotonic()
# update when we're still filling _xput, then after every second
if (xput_len < self.sma_window or
now - self._avg_update_ts > 1):
self.avg = sum(self._xput) / len(self._xput)
self._avg_update_ts = now
def update(self):
pass
def start(self):
pass
def writeln(self, line):
if self.file and self.is_tty():
width = len(line)
if width < self._max_width:
# Add padding to cover previous contents
line += ' ' * (self._max_width - width)
else:
self._max_width = width
print('\r' + line, end='', file=self.file)
self.file.flush()
def finish(self):
if self.file and self.is_tty():
print(file=self.file)
if self._hidden_cursor:
print(SHOW_CURSOR, end='', file=self.file)
self._hidden_cursor = False
def is_tty(self):
try:
return self.file.isatty() if self.check_tty else True
except AttributeError:
msg = "%s has no attribute 'isatty'. Try setting check_tty=False." % self
raise AttributeError(msg)
def next(self, n=1):
now = monotonic()
dt = now - self._ts
self.update_avg(n, dt)
self._ts = now
self.index = self.index + n
self.update()
def iter(self, it):
self.iter_value = None
with self:
for x in it:
self.iter_value = x
yield x
self.next()
del self.iter_value
def __enter__(self):
self.start()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.finish()
class Progress(Infinite):
def __init__(self, *args, **kwargs):
super(Progress, self).__init__(*args, **kwargs)
self.max = kwargs.get('max', 100)
@property
def eta(self):
return int(ceil(self.avg * self.remaining))
@property
def eta_td(self):
return timedelta(seconds=self.eta)
@property
def percent(self):
return self.progress * 100
@property
def progress(self):
if self.max == 0:
return 0
return min(1, self.index / self.max)
@property
def remaining(self):
return max(self.max - self.index, 0)
def start(self):
self.update()
def goto(self, index):
incr = index - self.index
self.next(incr)
def iter(self, it):
try:
self.max = len(it)
except TypeError:
pass
self.iter_value = None
with self:
for x in it:
self.iter_value = x
yield x
self.next()
del self.iter_value
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