python-progressbar/progressbar/widgets.py at develop · goofycoder/python-progressbar · GitHub

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from __future__ import division, absolute_import, with_statement

from __future__ import print_function

import datetime

import abc

import sys

import pprint

from . import utils

from . import six

from . import base

class FormatWidgetMixin(object):

'''Mixin to format widgets using a formatstring

Variables available:

- max_value: The maximum value (can be None with iterators)

- value: The current value

- total_seconds_elapsed: The seconds since the bar started

- seconds_elapsed: The seconds since the bar started modulo 60

- minutes_elapsed: The minutes since the bar started modulo 60

- hours_elapsed: The hours since the bar started modulo 24

- days_elapsed: The hours since the bar started

- time_elapsed: Shortcut for HH:MM:SS time since the bar started including

days

- percentage: Percentage as a float

'''

required_values = []

def __init__(self, format, **kwargs):

self.format = format

def __call__(self, progress, data, format=None):

'''Formats the widget into a string'''

try:

return (format or self.format) % data

except (TypeError, KeyError):

print('Error while formatting %r' % self.format, file=sys.stderr)

pprint.pprint(data, stream=sys.stderr)

raise

class WidthWidgetMixin(object):

'''Mixing to make sure widgets are only visible if the screen is within a

specified size range so the progressbar fits on both large and small

screens..

'''

def __init__(self, min_width=None, max_width=None, **kwargs):

self.min_width = min_width

self.max_width = max_width

def check_size(self, progress):

if self.min_width and self.min_width > progress.term_width:

return False

elif self.max_width and self.max_width < progress.term_width:

return False

else:

return True

class WidgetBase(object):

__metaclass__ = abc.ABCMeta

'''The base class for all widgets

The ProgressBar will call the widget's update value when the widget should

be updated. The widget's size may change between calls, but the widget may

display incorrectly if the size changes drastically and repeatedly.

The boolean TIME_SENSITIVE informs the ProgressBar that it should be

updated more often because it is time sensitive.

WARNING: Widgets can be shared between multiple progressbars so any state

information specific to a progressbar should be stored within the

progressbar instead of the widget.

'''

INTERVAL = None

def __init__(self, **kwargs):

pass

@abc.abstractmethod

def __call__(self, progress, data):

'''Updates the widget.

progress - a reference to the calling ProgressBar

'''

class AutoWidthWidgetBase(WidgetBase):

'''The base class for all variable width widgets.

This widget is much like the \\hfill command in TeX, 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.

'''

@abc.abstractmethod

def __call__(self, progress, data, width):

'''Updates the widget providing the total width the widget must fill.

progress - a reference to the calling ProgressBar

width - The total width the widget must fill

'''

class TimeSensitiveWidgetBase(WidgetBase):

'''The base class for all time sensitive widgets.

Some widgets like timers would become out of date unless updated at least

every `INTERVAL`

'''

INTERVAL = datetime.timedelta(seconds=1)

def _format_time(seconds):

'''Formats time as the string "HH:MM:SS".'''

return str(datetime.timedelta(seconds=int(seconds)))

class FormatLabel(FormatWidgetMixin, WidthWidgetMixin):

'''Displays a formatted label

>>> label = FormatLabel('%(value)s', min_width=5, max_width=10)

>>> class Progress(object):

... pass

>>> Progress.term_width = 0

>>> label(Progress, dict(value='test'))

>>> Progress.term_width = 5

>>> label(Progress, dict(value='test'))

'test'

>>> Progress.term_width = 10

>>> label(Progress, dict(value='test'))

'test'

>>> Progress.term_width = 11

>>> label(Progress, dict(value='test'))

'''

mapping = {

'finished': ('end_time', None),

'last_update': ('last_update_time', None),

'max': ('max_value', None),

'seconds': ('seconds_elapsed', None),

'start': ('start_time', None),

'elapsed': ('total_seconds_elapsed', _format_time),

'value': ('value', None),

}

def __init__(self, format, **kwargs):

FormatWidgetMixin.__init__(self, format=format, **kwargs)

WidthWidgetMixin.__init__(self, **kwargs)

def __call__(self, progress, data):

if not self.check_size(progress):

return ''

for name, (key, transform) in self.mapping.items():

try:

if transform is None:

data[name] = data[key]

else:

data[name] = transform(data[key])

except: # pragma: no cover

pass

return FormatWidgetMixin.__call__(self, progress, data)

class Timer(FormatLabel, TimeSensitiveWidgetBase):

'''WidgetBase which displays the elapsed seconds.'''

def __init__(self, format='Elapsed Time: %(elapsed)s', **kwargs):

FormatLabel.__init__(self, format=format, **kwargs)

TimeSensitiveWidgetBase.__init__(self, **kwargs)

# This is exposed as a static method for backwards compatibility

format_time = staticmethod(_format_time)

class SamplesMixin(object):

def __init__(self, samples=10, key_prefix=None, **kwargs):

self.samples = samples

self.key_prefix = (self.__class__.__name__ or key_prefix) + '_'

def get_sample_times(self, progress, data):

return progress.extra.setdefault(self.key_prefix + 'sample_times', [])

def get_sample_values(self, progress, data):

return progress.extra.setdefault(self.key_prefix + 'sample_values', [])

def __call__(self, progress, data):

sample_times = self.get_sample_times(progress, data)

sample_values = self.get_sample_values(progress, data)

if progress.value != progress.previous_value:

# Add a sample but limit the size to `num_samples`

sample_times.append(progress.last_update_time)

sample_values.append(progress.value)

if len(sample_times) > self.samples:

sample_times.pop(0)

sample_values.pop(0)

return sample_times, sample_values

class ETA(Timer):

'''WidgetBase which attempts to estimate the time of arrival.'''

def _eta(self, progress, data, value, elapsed):

if value == progress.min_value:

return 'ETA: --:--:--'

elif progress.end_time:

return 'Time: %s' % self.format_time(

data['total_seconds_elapsed'])

else:

eta = elapsed * progress.max_value / value \

- data['total_seconds_elapsed']

if eta > 0:

return 'ETA: %s' % self.format_time(eta)

else:

return 'ETA: 0:00:00'

def __call__(self, progress, data):

'''Updates the widget to show the ETA or total time when finished.'''

return self._eta(progress, data, data['value'],

data['total_seconds_elapsed'])

class AbsoluteETA(Timer):

'''Widget which attempts to estimate the absolute time of arrival.'''

def _eta(self, progress, data, value, elapsed):

"""Update the widget to show the ETA or total time when finished."""

if value == progress.min_value: # pragma: no cover

return 'Estimated finish time: ----/--/-- --:--:--'

elif progress.end_time:

return 'Finished at: %s' % self._format(progress.end_time)

else:

eta = elapsed * progress.max_value / value - elapsed

now = datetime.datetime.now()

eta_abs = now + datetime.timedelta(seconds=eta)

return 'Estimated finish time: %s' % self._format(eta_abs)

def _format(self, t):

return t.strftime("%Y/%m/%d %H:%M:%S")

def __call__(self, progress, data):

'''Updates the widget to show the ETA or total time when finished.'''

return self._eta(progress, data, data['value'],

data['total_seconds_elapsed'])

class AdaptiveETA(ETA, SamplesMixin):

'''WidgetBase which attempts to estimate the time of arrival.

Uses a sampled average of the speed based on the 10 last updates.

Very convenient for resuming the progress halfway.

'''

def __init__(self, **kwargs):

ETA.__init__(self, **kwargs)

SamplesMixin.__init__(self, **kwargs)

def __call__(self, progress, data):

times, values = SamplesMixin.__call__(self, progress, data)

if len(times) <= 1:

# No samples so just return the normal ETA calculation

return ETA.__call__(self, progress, data)

else:

return self._eta(progress, data, values[-1] - values[0],

utils.timedelta_to_seconds(times[-1] - times[0]))

class DataSize(FormatWidgetMixin):

'''

Widget for showing an amount of data transferred/processed.

Automatically formats the value (assumed to be a count of bytes) with an

appropriate sized unit, based on the IEC binary prefixes (powers of 1024).

'''

def __init__(

self, variable='value',

format='%(scaled)5.1f %(prefix)s%(unit)s', unit='B',

prefixes=('', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi'),

**kwargs):

self.variable = variable

self.unit = unit

self.prefixes = prefixes

FormatWidgetMixin.__init__(self, format=format, **kwargs)

def __call__(self, progress, data):

value = data[self.variable]

if value is not None:

scaled, power = utils.scale_1024(value, len(self.prefixes))

else:

scaled = power = 0

data['scaled'] = scaled

data['prefix'] = self.prefixes[power]

data['unit'] = self.unit

return FormatWidgetMixin.__call__(self, progress, data)

class FileTransferSpeed(FormatWidgetMixin, TimeSensitiveWidgetBase):

'''

WidgetBase for showing the transfer speed (useful for file transfers).

'''

def __init__(

self, format='%(scaled)5.1f %(prefix)s%(unit)-s/s',

inverse_format='%(scaled)5.1f s/%(prefix)s%(unit)-s', unit='B',

prefixes=('', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi'),

**kwargs):

self.unit = unit

self.prefixes = prefixes

self.inverse_format = inverse_format

FormatWidgetMixin.__init__(self, format=format, **kwargs)

TimeSensitiveWidgetBase.__init__(self, **kwargs)

def _speed(self, value, elapsed):

speed = float(value) / elapsed

return utils.scale_1024(speed, len(self.prefixes))

def __call__(self, progress, data, value=None, total_seconds_elapsed=None):

'''Updates the widget with the current SI prefixed speed.'''

value = data['value'] or value

elapsed = data['total_seconds_elapsed'] or total_seconds_elapsed

if value is not None and elapsed is not None \

and elapsed > 2e-6 and value > 2e-6: # =~ 0

scaled, power = self._speed(value, elapsed)

else:

scaled = power = 0

data['unit'] = self.unit

if power == 0 and scaled < 0.1:

if scaled > 0:

scaled = 1 / scaled

data['scaled'] = scaled

data['prefix'] = self.prefixes[0]

return FormatWidgetMixin.__call__(self, progress, data,

self.inverse_format)

else:

data['scaled'] = scaled

data['prefix'] = self.prefixes[power]

return FormatWidgetMixin.__call__(self, progress, data)

class AdaptiveTransferSpeed(FileTransferSpeed, SamplesMixin):

'''WidgetBase for showing the transfer speed, based on the last X samples

'''

def __init__(self, **kwargs):

FileTransferSpeed.__init__(self, **kwargs)

SamplesMixin.__init__(self, **kwargs)

def __call__(self, progress, data):

times, values = SamplesMixin.__call__(self, progress, data)

if len(times) <= 1:

# No samples so just return the normal transfer speed calculation

value = None

elapsed = None

else:

value = values[-1] - values[0]

elapsed = utils.timedelta_to_seconds(times[-1] - times[0])

return FileTransferSpeed.__call__(self, progress, data, value, elapsed)

class AnimatedMarker(WidgetBase):

'''An animated marker for the progress bar which defaults to appear as if

it were rotating.

'''

def __init__(self, markers='|/-\\', default=None, **kwargs):

self.markers = markers

self.default = default or markers[0]

WidgetBase.__init__(self, **kwargs)

def __call__(self, progress, data, width=None):

'''Updates the widget to show the next marker or the first marker when

finished'''

if progress.end_time:

return self.default

return self.markers[data['updates'] % len(self.markers)]

# Alias for backwards compatibility

RotatingMarker = AnimatedMarker

class Counter(FormatWidgetMixin, WidgetBase):

'''Displays the current count'''

def __init__(self, format='%(value)d', **kwargs):

FormatWidgetMixin.__init__(self, format=format, **kwargs)

WidgetBase.__init__(self, format=format, **kwargs)

class Percentage(FormatWidgetMixin, WidgetBase):

'''Displays the current percentage as a number with a percent sign.'''

def __init__(self, format='%(percentage)3d%%', **kwargs):

FormatWidgetMixin.__init__(self, format=format, **kwargs)

WidgetBase.__init__(self, format=format, **kwargs)

class SimpleProgress(FormatWidgetMixin, WidgetBase):

'''Returns progress as a count of the total (e.g.: "5 of 47")'''

def __init__(self, format='%(value)d of %(max_value)d', max_width=None,

**kwargs):

self.max_width = dict(default=max_width)

FormatWidgetMixin.__init__(self, format=format, **kwargs)

WidgetBase.__init__(self, format=format, **kwargs)

def __call__(self, progress, data, format=None):

formatted = FormatWidgetMixin.__call__(self, progress, data,

format=format)

# Guess the maximum width from the min and max value

key = progress.min_value, progress.max_value

max_width = self.max_width.get(key, self.max_width['default'])

if not max_width:

temporary_data = data.copy()

for value in key:

if value is None: # pragma: no cover

continue

temporary_data['value'] = value

width = len(FormatWidgetMixin.__call__(

self, progress, temporary_data, format=format))

if width: # pragma: no branch

max_width = max(max_width or 0, width)

self.max_width[key] = max_width

# Adjust the output to have a consistent size in all cases

if max_width: # pragma: no branch

formatted = formatted.rjust(max_width)

return formatted

class Bar(AutoWidthWidgetBase):

'''A progress bar which stretches to fill the line.'''

def __init__(self, marker='#', left='|', right='|', fill=' ',

fill_left=True, **kwargs):

'''Creates a customizable progress bar.

The callable takes the same parameters as the `__call__` method

marker - string or callable object to use as a marker

left - string or callable object to use as a left border

right - string or callable object to use as a right border

fill - character to use for the empty part of the progress bar

fill_left - whether to fill from the left or the right

'''

def string_or_lambda(input_):

if isinstance(input_, six.basestring):

def render_input(progress, data, width):

return input_ % data

return render_input

else:

return input_

def _marker(marker):

def __marker(progress, data, width):

if progress.max_value is not base.UnknownLength \

and progress.max_value > 0:

length = int(progress.value / progress.max_value * width)

return (marker * length)

else:

return ''

if isinstance(marker, six.basestring):

assert len(marker) == 1, 'Markers are required to be 1 char'

return __marker

else:

return marker

self.marker = _marker(marker)

self.left = string_or_lambda(left)

self.right = string_or_lambda(right)

self.fill = string_or_lambda(fill)

self.fill_left = fill_left

AutoWidthWidgetBase.__init__(self, **kwargs)

def __call__(self, progress, data, width):

'''Updates the progress bar and its subcomponents'''

left = self.left(progress, data, width)

right = self.right(progress, data, width)

width -= len(left) + len(right)

marker = self.marker(progress, data, width)

fill = self.fill(progress, data, width)

if self.fill_left:

marker = marker.ljust(width, fill)

else:

marker = marker.rjust(width, fill)

return left + marker + right

class ReverseBar(Bar):

'''A bar which has a marker which bounces from side to side.'''

def __init__(self, marker='#', left='|', right='|', fill=' ',

fill_left=False, **kwargs):

'''Creates a customizable progress bar.

marker - string or updatable object to use as a marker

left - string or updatable object to use as a left border

right - string or updatable object to use as a right border

fill - character to use for the empty part of the progress bar

fill_left - whether to fill from the left or the right

'''

Bar.__init__(self, marker=marker, left=left, right=right, fill=fill,

fill_left=fill_left, **kwargs)

class BouncingBar(Bar):

def update(self, progress, width): # pragma: no cover

'''Updates the progress bar and its subcomponents'''

left, marker, right = (i for i in (self.left, self.marker, self.right))

width -= len(left) + len(right)

if progress.finished:

return '%s%s%s' % (left, width * marker, right)

position = int(progress.value % (width * 2 - 1))

if position > width:

position = width * 2 - position

lpad = self.fill * (position - 1)

rpad = self.fill * (width - len(marker) - len(lpad))

# Swap if we want to bounce the other way

if not self.fill_left:

rpad, lpad = lpad, rpad

return '%s%s%s%s%s' % (left, lpad, marker, rpad, right)

python-progressbar/progressbar/widgets.py at develop · goofycoder/python-progressbar · GitHub

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