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# Copyright 2005-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import time
import signal
import portage
class ProgressHandler(object):
def __init__(self):
self.reset()
def reset(self):
self.curval = 0
self.maxval = 0
self.last_update = 0
self.min_display_latency = 0.2
def onProgress(self, maxval, curval):
self.maxval = maxval
self.curval = curval
cur_time = time.time()
if cur_time - self.last_update >= self.min_display_latency:
self.last_update = cur_time
self.display()
def display(self):
raise NotImplementedError(self)
class ProgressBar(ProgressHandler):
"""Class to set up and return a Progress Bar"""
def __init__(self, isatty, **kwargs):
self.isatty = isatty
self.kwargs = kwargs
ProgressHandler.__init__(self)
self.progressBar = None
def start(self):
if self.isatty:
self.progressBar = portage.output.TermProgressBar(**self.kwargs)
signal.signal(signal.SIGWINCH, self.sigwinch_handler)
else:
self.onProgress = None
return self.onProgress
def set_label(self, _label):
self.kwargs['label'] = _label
def display(self):
self.progressBar.set(self.curval, self.maxval)
def sigwinch_handler(self, signum, frame):
lines, self.progressBar.term_columns = \
portage.output.get_term_size()
def stop(self):
signal.signal(signal.SIGWINCH, signal.SIG_DFL)
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