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# Copyright 2010 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import time
import ttystatus
class ByteSpeed(ttystatus.Widget):
'''Display data size in bytes, KiB, etc.'''
def __init__(self, name):
self.name = name
self.interesting_keys = [name]
self._bytes = 0
self._started = None
def now(self):
'''Wrapper around time.time for unit tests to overrride.'''
return time.time()
def format(self):
units = (
(1024**4, 2, 'TiB/s'),
(1024**3, 2, 'GiB/s'),
(1024**2, 2, 'MiB/s'),
(1024**1, 1, 'KiB/s'),
)
if self._started is None:
return '0 B/s'
duration = self.now() - self._started
speed = self._bytes / duration
for factor, decimals, unit in units:
if speed >= factor:
return '%.*f %s' % (decimals,
float(speed) / float(factor),
unit)
return '%.0f B/s' % speed
def update(self, master, width):
if self._started is None:
self._started = self.now()
self._bytes = master[self.name]
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