/
widgets.py
714 lines (538 loc) · 23.8 KB
/
widgets.py
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from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from __future__ import with_statement
import abc
import datetime
import pprint
import sys
from python_utils import converters
from . import base
from . import six
from . import utils
MAX_DATE = datetime.date(year=datetime.MAXYEAR, month=12, day=31)
MAX_TIME = datetime.time(23, 59, 59)
MAX_DATETIME = datetime.datetime.combine(MAX_DATE, MAX_TIME)
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 create_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 marker
if isinstance(marker, six.basestring):
marker = converters.to_unicode(marker)
assert len(marker) == 1, 'Markers are required to be 1 char'
return _marker
else:
return marker
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 INTERVAL 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.
'''
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(milliseconds=100)
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
>>> str(label(Progress, dict(value='test')))
''
>>> Progress.term_width = 5
>>> str(label(Progress, dict(value='test')))
'test'
>>> Progress.term_width = 10
>>> str(label(Progress, dict(value='test')))
'test'
>>> Progress.term_width = 11
>>> str(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', utils.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, **kwargs):
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 (KeyError, ValueError, IndexError): # pragma: no cover
pass
return FormatWidgetMixin.__call__(self, progress, data, **kwargs)
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(utils.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 sample_times:
sample_time = sample_times[-1]
else:
sample_time = datetime.datetime.min
if progress.last_update_time - sample_time > self.INTERVAL:
# 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 __init__(
self,
format_not_started='ETA: --:--:--',
format_finished='Time: %(elapsed)s',
format='ETA: %(eta)s',
format_zero='ETA: 0:00:00',
format_NA='ETA: N/A',
**kwargs):
Timer.__init__(self, **kwargs)
self.format_not_started = format_not_started
self.format_finished = format_finished
self.format = format
self.format_zero = format_zero
self.format_NA = format_NA
def _calculate_eta(self, progress, data, value, elapsed):
'''Updates the widget to show the ETA or total time when finished.'''
if elapsed:
# The max() prevents zero division errors
per_item = elapsed / max(value, 0.000000001)
remaining = progress.max_value - data['value']
eta_seconds = remaining * per_item
else:
eta_seconds = 0
return eta_seconds
def __call__(self, progress, data, value=None, elapsed=None):
'''Updates the widget to show the ETA or total time when finished.'''
if value is None:
value = data['value']
if elapsed is None:
elapsed = data['total_seconds_elapsed']
ETA_NA = False
try:
data['eta_seconds'] = self._calculate_eta(
progress, data, value=value, elapsed=elapsed)
except TypeError:
data['eta_seconds'] = None
ETA_NA = True
if data['eta_seconds']:
data['eta'] = utils.format_time(data['eta_seconds'])
else:
data['eta'] = None
if data['value'] == progress.min_value:
format = self.format_not_started
elif progress.end_time:
format = self.format_finished
elif data['eta']:
format = self.format
elif ETA_NA:
format = self.format_NA
else:
format = self.format_zero
return Timer.__call__(self, progress, data, format=format)
class AbsoluteETA(ETA):
'''Widget which attempts to estimate the absolute time of arrival.'''
def _calculate_eta(self, progress, data, value, elapsed):
eta_seconds = ETA._calculate_eta(self, progress, data, value, elapsed)
now = datetime.datetime.now()
try:
return now + datetime.timedelta(seconds=eta_seconds)
except OverflowError: # pragma: no cover
return datetime.datetime.max
def __init__(
self,
format_not_started='Estimated finish time: ----/--/-- --:--:--',
format_finished='Finished at: %(elapsed)s',
format='Estimated finish time: %(eta)s',
**kwargs):
Timer.__init__(self, **kwargs)
self.format_not_started = format_not_started
self.format_finished = format_finished
self.format = format
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
value = None
elapsed = 0
else:
value = values[-1] - values[0]
elapsed = utils.timedelta_to_seconds(times[-1] - times[0])
return ETA.__call__(self, progress, data, value=value, elapsed=elapsed)
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)
def __call__(self, progress, data, format=None):
# If percentage is not available, display N/A%
if 'percentage' in data and not data['percentage']:
return FormatWidgetMixin.__call__(self, progress, data,
format='N/A%%')
return FormatWidgetMixin.__call__(self, progress, data)
class SimpleProgress(FormatWidgetMixin, WidgetBase):
'''Returns progress as a count of the total (e.g.: "5 of 47")'''
DEFAULT_FORMAT = '%(value_s)s of %(max_value_s)s'
def __init__(self, format=DEFAULT_FORMAT, 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):
# If max_value is not available, display N/A
if data.get('max_value'):
data['max_value_s'] = data.get('max_value')
else:
data['max_value_s'] = 'N/A'
# if value is not available it's the zeroth iteration
if data.get('value'):
data['value_s'] = data['value']
else:
data['value_s'] = 0
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 = progress.custom_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
'''
self.marker = create_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 = converters.to_unicode(self.left(progress, data, width))
right = converters.to_unicode(self.right(progress, data, width))
width -= progress.custom_len(left) + progress.custom_len(right)
marker = converters.to_unicode(self.marker(progress, data, width))
fill = converters.to_unicode(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 that goes from right to left'''
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, TimeSensitiveWidgetBase):
'''A bar which has a marker which bounces from side to side.'''
INTERVAL = datetime.timedelta(milliseconds=100)
def __call__(self, progress, data, width):
'''Updates the progress bar and its subcomponents'''
left = converters.to_unicode(self.left(progress, data, width))
right = converters.to_unicode(self.right(progress, data, width))
width -= progress.custom_len(left) + progress.custom_len(right)
marker = converters.to_unicode(self.marker(progress, data, width))
fill = converters.to_unicode(self.fill(progress, data, width))
if width: # pragma: no branch
value = int(
data['total_seconds_elapsed'] / self.INTERVAL.total_seconds())
a = value % width
b = width - a - 1
if value % (width * 2) >= width:
a, b = b, a
if self.fill_left:
marker = a * fill + marker + b * fill
else:
marker = b * fill + marker + a * fill
return left + marker + right
class FormatCustomText(FormatWidgetMixin, WidthWidgetMixin):
mapping = {}
def __init__(self, format, mapping=mapping, **kwargs):
self.format = format
self.mapping = mapping
FormatWidgetMixin.__init__(self, format=format, **kwargs)
WidthWidgetMixin.__init__(self, **kwargs)
def update_mapping(self, **mapping):
self.mapping.update(mapping)
def __call__(self, progress, data):
return FormatWidgetMixin.__call__(self, progress, self.mapping,
self.format)
class DynamicMessage(FormatWidgetMixin, WidgetBase):
'''Displays a custom variable.'''
def __init__(self, name):
'''Creates a DynamicMessage associated with the given name.'''
if not isinstance(name, str):
raise TypeError('DynamicMessage(): argument must be a string')
if len(name.split()) > 1:
raise ValueError(
'DynamicMessage(): argument must be single word')
self.name = name
def __call__(self, progress, data):
val = data['dynamic_messages'][self.name]
if val:
return self.name + ': ' + '{:6.3g}'.format(val)
else:
return self.name + ': ' + 6 * '-'
class CurrentTime(FormatWidgetMixin, TimeSensitiveWidgetBase):
'''Widget which displays the current (date)time with seconds resolution.'''
INTERVAL = datetime.timedelta(seconds=1)
def __init__(self, format='Current Time: %(current_time)s',
microseconds=False, **kwargs):
self.microseconds = microseconds
FormatWidgetMixin.__init__(self, format=format, **kwargs)
TimeSensitiveWidgetBase.__init__(self, **kwargs)
def __call__(self, progress, data):
data['current_time'] = self.current_time()
data['current_datetime'] = self.current_datetime()
return FormatWidgetMixin.__call__(self, progress, data)
def current_datetime(self):
now = datetime.datetime.now()
if not self.microseconds:
now = now.replace(microsecond=0)
return now
def current_time(self):
return self.current_datetime().time()